Title of the invention: A molded product, a structural member using the molded product, and a method for manufacturing the molded product.
Technical field
[0001]
The present invention relates to a molded product, a structural member using the molded product, and a method for manufacturing the molded product.
Background technology
[0002]
Automotive structural members (especially long members) are required to have high characteristics in the three-point bending test in order to improve collision safety performance. Therefore, various proposals have been made so far.
[0003]
The figures of Patent Document 1 and Patent Document 2 disclose a shock absorbing member including a portion in which steel plates are triple-folded.
[0004]
Patent Document 3 discloses a method of forming a recess in a wall portion of a member having a substantially hat-shaped cross section. In this method, a recess is formed by pressing the wall portion with a feeding roller. Therefore, in this method, a portion protruding from the wall portion before forming the concave portion is not formed.
[0005]
Patent Document 4 discloses a hollow columnar part in which the connecting region between the vertical wall portion and the top wall portion projects outward. In order to increase the number of ridges in the cross section, the overhanging part is not folded.
[0006]
Patent Document 5 discloses a method for manufacturing a cross-sectional hat-shaped part in which a groove-shaped bead portion is formed along a longitudinal direction on a vertical wall portion.
[0007]
Patent Document 6 discloses a frame component having a reinforcing portion formed at a connecting portion between a top wall portion and a vertical wall portion. This reinforcing portion is composed of a superposed portion rolled into a semi-cylindrical shape (paragraph [0015] of the same document).
[0008]
Patent Document 7 discloses a joint structural member in which a corner portion is formed into an oval concave shape or a convex shape.
Prior art literature
Patent documents
[0009]
Patent Document 1: Japanese Patent Application Laid-Open No. 2008-265609
Patent Document 2: Japanese Patent Application Laid-Open No. 2008-155479
Patent Document 3: Japanese Patent Application Laid-Open No. 2010-242168
Patent Document 4: Japanese Patent Application Laid-Open No. 2011-67841
Patent Document 5: Japanese Patent Application Laid-Open No. 2011-83807
Patent Document 6: Japanese Patent Application Laid-Open No. 2013-27894
Patent Document 7: Japanese Patent Application Laid-Open No. 9-249155
Outline of the invention
Problems to be solved by the invention
[0010]
The techniques described in Patent Documents 1 to 7 are aimed at improving impact characteristics and compression characteristics as compared with conventional hat-shaped structural members. However, at present, as structural members of automobiles such as side sills, structural members capable of further enhancing collision safety performance are required. In other words, there is a demand for press-molded products with higher strength and higher characteristics in the three-point bending test.
[0011]
Further, in the structural members described in Patent Documents 1 to 7, since the shock absorbing member or the like is provided over the entire length in the longitudinal direction of the structural member, there is a problem that free design is hindered. For example, when the structural members described in Patent Documents 1 to 7 are applied to a limited space, further improvements and ingenuity such as further processing or joining with other members are required. ..
[0012]
One of the objects of the present invention made in view of such a situation is to provide a molded product having high strength, high characteristics in a three-point bending test, and a high degree of freedom in design, and a structural member using the same. That is. Further, one of the objects of the present invention is to provide a manufacturing method for manufacturing the molded product.
Means to solve the problem
[0013]
(1) The first aspect of the present invention is a top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, and outside from both ends of the top plate portion in the width direction. 1 includes a portion extending toward the top plate portion and a protruding portion formed in a part of the top plate portion in the longitudinal direction by overlapping the portions extending toward the outside and the portion extending from the upper end of the vertical wall portion toward the outside. A long molded product formed of a single steel plate, in the longitudinal direction of the molded product, a region where the protrusion is provided is defined as a protrusion region, and a region where the protrusion is not provided is defined as a protrusion region. When defined as a non-protruding region, in the non-protruding region, a recess extending in the longitudinal direction is formed in the top plate portion, and the protrusion is formed in the cross section perpendicular to the longitudinal direction of the molded product. The total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion, and the top plate portion, the vertical wall portion, and the concave portion in the cross section perpendicular to the longitudinal direction of the molded product in the non-protruding region. The total value β of the inner surface peripheral length of the above is a molded product satisfying 1.01 ≦ β / α ≦ 1.50.
(2) A second aspect of the present invention is a top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, and outside from both ends of the top plate portion in the width direction. 1 includes a portion extending toward the top plate portion and a protruding portion formed in a part of the top plate portion in the longitudinal direction by overlapping the portions extending toward the outside and the portion extending from the upper end of the vertical wall portion toward the outside. A long molded product formed of a single steel plate, in the longitudinal direction of the molded product, a region where the protrusion is provided is defined as a protrusion region, and a region where the protrusion is not provided is defined as a protrusion region. When defined as a non-protruding region, in the non-protruding region, the top plate portion has an enlarged top plate portion extending from the top plate portion in the width direction and continuing to the vertical wall portion, and the top plate portion in the protruding region. In the cross section perpendicular to the longitudinal direction of the molded product in the non-protruding region, the total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product. A molded product in which the total value β of the inner surface peripheral lengths of the top plate portion including the enlarged top plate portion and the vertical wall portion satisfies 1.01 ≦ β / α ≦ 1.50.
(3) A third aspect of the present invention is a top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, and outside from both ends of the top plate portion in the width direction. One piece including a portion extending toward the surface and a protruding portion formed in a part of the top plate portion in the longitudinal direction by overlapping the portions from the upper end of the vertical wall portion toward the outside. In the longitudinal direction of the molded product, the region where the protrusion is provided is defined as a protrusion region, and the region where the protrusion is not provided is defined as a non-projection region. When defined as a protruding region, in the non-protruding region, the vertical wall portion has an enlarged vertical wall portion extending upward from the vertical wall portion and connected to the top plate portion, and the molded product in the protruding region. The total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction, and the top plate in the non-protruding region in the cross section perpendicular to the longitudinal direction of the molded product. A molded product in which the total value β of the inner surface peripheral lengths of the portion and the vertical wall portion including the enlarged vertical wall portion satisfies 1.01 ≦ β / α ≦ 1.50.
[0014]
(4) The molded product according to any one of (1) to (3) above may further include a flange portion extending from the lower end of the vertical wall portion toward the outside.
(5) In the molded product according to any one of (1) to (4) above, even if the length of the protruding region in the longitudinal direction is 30% or more of the total length of the molded product in the longitudinal direction. good.
(6) In the molded product according to any one of (1) to (5) above, in the protruding portion, the portion extending from the top plate portion and the portion extending from the vertical wall portion may be in close contact with each other.
(7) In the molded product according to any one of (1) to (6) above, a portion extending from the top plate portion and a portion extending from the vertical wall portion may be joined to each other in the protruding portion.
(8) In the molded product according to any one of (1) to (7) above, the top plate portion and the protruding portion form a cross section perpendicular to the longitudinal direction of the molded product in the protruding region. The angle may be 90 ° or more and 180 ° or less.
[0015]
(9) A fourth aspect of the present invention includes the molded product according to any one of (1) to (8) above and the steel plate member fixed to the molded product, and is perpendicular to the longitudinal direction. In cross-sectional view, the molded product and the steel plate member form a closed cross section, which is a structural member.
(10) In the structural member according to (9) above, at least one of the two vertical wall portions and the top plate portion, or at least one of the two vertical wall portions and the said. Auxiliary members joined to each of the top plate portions may be further included.
[0016]
(11) A fifth aspect of the present invention includes a top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, and a flange portion extending from the lower end of the vertical wall portion. A part of the top plate portion in the longitudinal direction is formed by overlapping a portion extending outward from both ends of the top plate portion in the width direction and a portion extending outward from the upper end of the vertical wall portion. A long molded product formed of a single steel plate including a protruding portion formed in the above, and a region provided with the protruding portion in the longitudinal direction of the molded product is defined as a protruding region. However, when the region in which the protruding portion is not provided is defined as the non-protruding region, in the non-protruding region, a recess extending in the longitudinal direction is formed in the top plate portion, and the recess in the protruding region is formed. The total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product, and the said in the cross section perpendicular to the longitudinal direction of the molded product in the non-protruding region. A method for manufacturing a molded product in which the total value β of the inner surface peripheral lengths of the top plate portion, the vertical wall portion, and the concave portion satisfies 1.01 ≦ β / α ≦ 1.50, and in the non-protruding region. It is performed using a press device including an upper mold and a lower mold having a shape corresponding to the recess, and two mobile molds that can move vertically and horizontally, and the lower mold is a punch mold and the punch mold. (Ia) The step of arranging the material steel plate between the upper mold and the two moving molds and the lower mold, and (Ib). ) The two moving molds are lowered together with the two movable plates, and the two moving molds are moved toward the punch mold, whereby the two moving molds and the two movable plates are separated from each other. By the step of obtaining a deformed steel plate with the end portion of the material steel plate sandwiched between them and (IIa) further moving the two moving molds toward the punch mold, a part of the deformed steel plate is partially moved to the two moving molds. And the step of restraining by the side surface portion of the punch mold, and (IIb) by lowering the upper mold, a part of the deformed steel plate is pressed by the upper mold and the punch mold, and the upper mold is formed. A method for manufacturing a molded product, comprising a step of superimposing a part of the deformed steel plate on the mobile mold and thereby forming the molded product having the top plate portion in which the recess is formed. ..
(12) A sixth aspect of the present invention is a top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, and a flange portion extending from the lower end of the vertical wall portion. A part of the top plate portion in the longitudinal direction is formed by overlapping a portion extending outward from both ends of the top plate portion in the width direction and a portion extending outward from the upper end of the vertical wall portion. A long molded product formed of a single steel plate including a protruding portion formed in the above, and a region provided with the protruding portion in the longitudinal direction of the molded product is defined as a protruding region. However, when the region in which the protruding portion is not provided is defined as a non-protruding region, in the non-protruding region, the top plate portion extends in the width direction from the top plate portion and extends to the vertical wall portion. A top plate portion, the total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product in the protruding region, and the non-projecting region. The total value β of the inner surface peripheral lengths of the top plate portion including the enlarged top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product is 1.01 ≦ β / α ≦ 1. A method for manufacturing a molded product satisfying 50, including an upper mold and a lower mold having a shape corresponding to the enlarged top plate portion in the non-protruding region, and two moving molds that can be moved in the vertical direction and the horizontal direction. Performed using a press device, the lower mold comprises a punch mold and two movable plates arranged to sandwich the punch mold and movable in the vertical direction (Ia) the upper mold and the two. The step of arranging the material steel plate between the moving mold and the lower mold, and (Ib) lowering the two moving molds together with the two movable plates and moving the two moving molds toward the punch mold. By letting, the two mobile types and the two movable plates A part of the deformed steel plate is obtained by (IIa) further moving the two moving molds toward the punch mold in a step of obtaining a deformed steel plate with the end portion of the material steel plate sandwiched between the two moving molds. A part of the deformed steel plate is pressed by the upper mold and the punch mold by the step of restraining by the two moving molds and the side surface portion of the punch mold and (IIb) lowering the upper mold. , A step of superimposing a part of the deformed steel plate between the upper mold and the moving mold to form the molded product having the top plate portion including the enlarged top plate portion. It is a manufacturing method of the product.
(13) A seventh aspect of the present invention is a top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, and a flange portion extending from the lower end of the vertical wall portion. A portion of the top plate portion extending outward from both ends in the width direction and a portion extending outward from the upper end of the vertical wall portion overlap each other to form a part of the top plate portion in the longitudinal direction. A long molded product formed of a single steel plate including a formed protruding portion, and a region provided with the protruding portion in the longitudinal direction of the molded product is defined as a protruding region. When the region in which the protruding portion is not provided is defined as a non-protruding region, in the non-protruding region, the vertical wall portion extends upward from the vertical wall portion and is connected to the top plate portion. In the protruding region, the total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product, and the molded product in the non-protruding region. The total value β of the inner surface peripheral lengths of the top plate portion and the vertical wall portion including the enlarged vertical wall portion in the cross section perpendicular to the longitudinal direction satisfies 1.01 ≦ β / α ≦ 1.50. A method for manufacturing a molded product, the press apparatus including an upper mold and a lower mold having a shape corresponding to the enlarged vertical wall portion in the non-protruding region, and two mobile molds that can be moved in the vertical and horizontal directions. The lower mold comprises a punch mold and two movable plates arranged so as to sandwich the punch mold and movable in the vertical direction, and (Ia) the upper mold and the two mobile molds. By arranging the material steel plate between the lower mold and (Ib) the two moving molds are lowered together with the two movable plates and the two moving molds are moved toward the punch mold. A step of obtaining a deformed steel plate with the end portion of the material steel plate sandwiched between the two moving molds and the two movable plates, and (IIa) further moving the two moving molds toward the punch mold. By moving, a part of the deformed steel plate is restrained by the two moving molds and the side surface portions of the punch mold, and (IIb) by lowering the upper mold, a part of the deformed steel plate is moved. While pressing by the upper mold and the punch mold, a part of the deformed steel plate is overlapped between the upper mold and the moving mold, whereby the vertical wall portion including the enlarged vertical wall portion is provided. It is a manufacturing method of a molded product including a step of forming a molded product.
[0017]
(14) In the method for manufacturing a molded product according to any one of (11) to (13) above, the deformed steel plate obtained in the step (Ib) has a long shape and the top plate. The above (Ib) includes a top plate corresponding portion to be a portion, a vertical wall corresponding portion to be the vertical wall portion, a protruding portion corresponding portion to be the protruding portion, and a flange portion corresponding portion to be the flange portion. In the step, the flange portion corresponding portion is sandwiched between the two moving molds and the two movable plates, and in the step (IIa), the vertical wall portion corresponding portion is formed into the two moving molds and the punch mold. By restraining the upper mold with the side surface portion of the above and lowering the upper mold in the step (IIb), the upper plate corresponding portion is pressed by the upper mold and the punch mold, and the upper mold and the said mold are used. At least a part of the protrusion corresponding portion may be overlapped with the mobile type.
(15) The method for producing a molded product according to any one of (11) to (14) above may further include a step of cutting the flange portion after the step of molding the molded product.
(16) In the method for manufacturing a molded product according to any one of (11) to (15) above, the angle formed by the top plate portion and the protruding portion is 90 ° in the cross-sectional view of the molded product. The temperature is 135 ° or less, and the step (IIa) may be completed after the step (IIb) is completed.
(17) In the method for manufacturing a molded product according to any one of (11) to (15) above, the angle formed by the top plate portion and the protruding portion is 135 ° in the cross-sectional view of the molded product. The temperature is 180 ° or less, and the step (IIb) may be completed after the step (IIa) is completed.
(18) The method for producing a molded product according to any one of (11) to (17) above further includes a step of heating the material steel plate before the step (Ia), and the step (Ia). In the step (Ib) and the step (Ib), the punch mold and the material steel plate are maintained in a non-contact state, and in the step (IIa), the upper surface portion of the punch mold and the deformed steel plate are maintained in a non-contact state. You may.
(19) An eighth aspect of the present invention includes a top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, and a flange portion extending from the lower end of the vertical wall portion. A part of the top plate portion in the longitudinal direction is formed by overlapping a portion extending outward from both ends of the top plate portion in the width direction and a portion extending outward from the upper end of the vertical wall portion. A long molded product formed of a single steel plate including a protruding portion formed in the above, and a region provided with the protruding portion in the longitudinal direction of the molded product is defined as a protruding region. However, when the region in which the protruding portion is not provided is defined as the non-protruding region, in the non-protruding region, a recess extending in the longitudinal direction is formed in the top plate portion, and the recess in the protruding region is formed. The total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product, and the said in the cross section perpendicular to the longitudinal direction of the molded product in the non-protruding region. A method for manufacturing a molded product in which the total value β of the inner surface peripheral lengths of the top plate portion, the vertical wall portion, and the concave portion satisfies 1.01 ≦ β / α ≦ 1.50, and deforms the material steel plate. As a result, it has a long shape and becomes a top plate corresponding portion to be the top plate portion, a vertical wall corresponding portion to be the vertical wall portion, a protruding portion corresponding portion to be the protruding portion, and the flange portion. A first step of obtaining a deformed steel plate including a flange portion corresponding portion and a second step of forming the deformed steel plate to form the molded product are included, and in the second step, at least the protruding portion corresponding portion is included. It is a method of manufacturing a molded product in which the protruding portion having the top plate portion in which the recess is formed is formed by superimposing a part thereof.
(20) A ninth aspect of the present invention includes a top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, and a flange portion extending from the lower end of the vertical wall portion. A part of the top plate portion in the longitudinal direction is formed by overlapping a portion extending outward from both ends of the top plate portion in the width direction and a portion extending outward from the upper end of the vertical wall portion. A long molded product formed of a single steel plate including a protruding portion formed in the above, and a region provided with the protruding portion in the longitudinal direction of the molded product is defined as a protruding region. However, when the region in which the protruding portion is not provided is defined as a non-protruding region, in the non-protruding region, the top plate portion extends in the width direction from the top plate portion and extends to the vertical wall portion. A top plate portion, the total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product in the protruding region, and the non-projecting region. The total value β of the inner surface peripheral lengths of the top plate portion including the enlarged top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product is 1.01 ≦ β / α ≦ 1. A method for manufacturing a molded product satisfying 50, which has a long shape by deforming a material steel plate, and has a top plate equivalent portion to be the top plate portion and two vertical wall portions to be the vertical wall portion. The first step of obtaining a deformed steel plate including the corresponding portion, the protruding portion corresponding portion to be the protruding portion, and the flange portion corresponding portion to be the flange portion, and the second step of molding the deformed steel plate to form the molded product. Manufacture of a molded product comprising the above-mentioned step, and in the second step, forming the protruding portion having the top plate portion including the enlarged top plate portion by superimposing at least a part of the protruding portion corresponding portion. The method.
(21) A tenth aspect of the present invention includes a top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, and a flange portion extending from the lower end of the vertical wall portion. A portion of the top plate portion extending outward from both ends in the width direction and a portion extending outward from the upper end of the vertical wall portion overlap each other to form a part of the top plate portion in the longitudinal direction. A long molded product formed of a single steel plate including a formed protruding portion, and a region provided with the protruding portion in the longitudinal direction of the molded product is defined as a protruding region. When the region in which the protruding portion is not provided is defined as a non-protruding region, in the non-protruding region, the vertical wall portion extends upward from the vertical wall portion and is connected to the top plate portion. In the protruding region, the total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product, and the molded product in the non-protruding region. The total value β of the inner surface peripheral lengths of the top plate portion and the vertical wall portion including the enlarged vertical wall portion in the cross section perpendicular to the longitudinal direction satisfies 1.01 ≦ β / α ≦ 1.50. It is a method for manufacturing a molded product, which has a long shape by deforming a material steel plate, and has a top plate equivalent portion that becomes the top plate portion, a vertical wall portion corresponding portion that serves as the vertical wall portion, and the protrusion. Includes a first step of obtaining a deformed steel plate including a protruding portion corresponding portion and a flange portion corresponding portion serving as a flange portion, and a second step of forming the deformed steel plate to form the molded product. A method for manufacturing a molded product, wherein in the second step, at least a part of the protrusion corresponding portion is overlapped to form the protrusion having the vertical wall portion including the enlarged vertical wall portion.
[0018]
(22) The method for producing a molded product according to any one of (19) to (21) above may further include a step of cutting the flange portion after the second step.
(23) In the method for producing a molded product according to any one of (19) to (22) above, a heating step of heating the deformed steel plate after the first step and before the second step. In the second step, hot press molding is performed by a press mold including an upper mold and a lower mold having a convex portion, and two cam molds. The deformed steel plate may be arranged in a state where the convex portion and the deformed steel plate are not in contact with each other.
Effect of the invention
[0019]
According to the present invention, a molded product having high strength and high characteristics in a three-point bending test and a high degree of design freedom, and a structural member using the molded product can be obtained. Further, according to the manufacturing method according to the present invention, the molded product can be easily manufactured.
A brief description of the drawing
[0020]
FIG. 1 is a perspective view schematically showing a press-molded product 100 according to an embodiment of the present invention.
FIG. 2A is a cross-sectional view schematically showing a cross-sectional shape of the press-molded product 100 in the AA'cross section.
FIG. 2B is a cross-sectional view schematically showing a cross-sectional shape of a press-molded product 100 in a BB'cross section.
FIG. 3 is a schematic cross-sectional view for explaining a joint region of a protrusion.
FIG. 4A is a cross-sectional view schematically showing a case where the angle X is 145 °.
FIG. 4B is a schematic cross-sectional view for explaining a protruding portion of the press-molded product 100.
FIG. 5 is a perspective view schematically showing a press-molded product 100A according to a modified example.
FIG. 6 is a perspective view schematically showing a press-molded product 100B according to a modified example.
FIG. 7A is a sectional view schematically showing an example of a structural member 200 according to an embodiment of the present invention.
FIG. 7B is a cross-sectional view schematically showing another example of the structural member 200.
FIG. 7C is a cross-sectional view schematically showing another example of the structural member 200.
[Fig. 7D] FIG. 7D is a cross-sectional view schematically showing an example of the case where the press-molded product 100 is used as a structural part.
FIG. 8A is a cross-sectional view schematically showing an example of a state in which an auxiliary member 601 is joined to a structural member 200.
FIG. 8B is a cross-sectional view schematically showing another example of a state in which an auxiliary member 601 is joined to a structural member 200.
FIG. 8C is a cross-sectional view schematically showing another example of a state in which the auxiliary member 601 is joined to the structural member 200.
FIG. 8D is a cross-sectional view schematically showing another example of a state in which the auxiliary member 601 is joined to the structural member 200.
FIG. 9A is a cross-sectional view schematically showing an example of a state in which an auxiliary member 701 as a modification is joined to a structural member 200.
FIG. 9B is a cross-sectional view schematically showing another example of a state in which an auxiliary member 701 as a modification is joined to a structural member 200.
FIG. 10A is a cross-sectional view schematically showing the step (Ia) in an example of the manufacturing method of the present embodiment, and is a cross-sectional view of a preformed product in a first region.
[FIG. 10B] FIG. 10B is a cross-sectional view schematically showing the step (Ia) in an example of the manufacturing method of the present embodiment, and is a cross-sectional view of a preformed product in a second region.
[FIG. 10C] FIG. 10C is a cross-sectional view of the preformed product in the first region, schematically showing the step (Ib) following the step of FIG. 10A.
FIG. 10D is a cross-sectional view of a preformed product in a second region schematically showing the step (Ib) following the step of FIG. 10B.
FIG. 10E is a cross-sectional view of a preformed product in the first region, schematically showing the step (IIa) following the step of FIG. 10C.
FIG. 10F is a cross-sectional view of a preformed product in a second region schematically showing the step (IIa) following the step of FIG. 10D.
FIG. 10G is a cross-sectional view of the preformed product in the first region, schematically showing the step (IIb) following the step of FIG. 10E.
FIG. 10H is a cross-sectional view of a preformed product in a second region schematically showing the step (IIb) following the step of FIG. 10F.
[FIG. 11A] FIG. 11A is a cross-sectional view schematically showing the step (Ia) in an example of the manufacturing method of the present embodiment, and is a cross-sectional view of a preformed product in a first region.
[FIG. 11B] FIG. 11B is a cross-sectional view schematically showing the step (Ia) in an example of the manufacturing method of the present embodiment, and is a cross-sectional view of a preformed product in a second region.
[FIG. 11C] FIG. 11C is a cross-sectional view of the preformed product in the first region, schematically showing the step (Ib) following the step of FIG. 11A.
FIG. 11D is a cross-sectional view of a preformed product in a second region schematically showing the step (Ib) following the step of FIG. 11B.
FIG. 11E is a cross-sectional view of the preformed product in the first region, schematically showing the step (IIa) following the step of FIG. 11C.
FIG. 11F is a cross-sectional view of a preformed product in a second region schematically showing the step (IIa) following the step of FIG. 11D.
FIG. 11G is a cross-sectional view of the preformed product in the first region, schematically showing the step (IIb) following the step of FIG. 11E.
[FIG. 11H] FIG. 11H is a cross-sectional view of a preformed product in a second region schematically showing the step (IIb) following the step of FIG. 11F.
[FIG. 12A] FIG. 12A is a cross-sectional view schematically showing the step (Ia) in an example of the manufacturing method of the present embodiment, and is a cross-sectional view of a preformed product in a first region.
[FIG. 12B] FIG. 12B is a cross-sectional view schematically showing the step (Ia) in an example of the manufacturing method of the present embodiment, and is a cross-sectional view of a preformed product in a second region.
[FIG. 12C] FIG. 12C is a cross-sectional view of a preformed product in the first region, schematically showing the steps (Ib) to (IIa) following the step of FIG. 12A.
[FIG. 12D] FIG. 12D is a cross-sectional view of a preformed product in a second region schematically showing the steps (Ib) to (IIa) following the step of FIG. 12B.
FIG. 12E is a cross-sectional view of the preformed product in the first region, schematically showing the step (IIb) following the step of FIG. 12C.
[FIG. 12F] FIG. 12F is a cross-sectional view of a preformed product in a second region schematically showing the step (IIb) following the step of FIG. 12D.
FIG. 13 is a cross-sectional view schematically showing an example of a preformed product formed in the manufacturing method of the present embodiment.
[FIG. 14A] FIG. 14A is a cross-sectional view schematically showing one step in the second step in an example of the manufacturing method of the present embodiment, and is a cross-sectional view of a preformed product in a first region.
[FIG. 14B] FIG. 14B is a cross-sectional view schematically showing one step in the second step in an example of the manufacturing method of the present embodiment, and is a cross-sectional view of a preformed product in a second region.
[FIG. 14C] FIG. 14C is a cross-sectional view of a preformed product in the first region, schematically showing one step following the step of FIG. 14A.
[FIG. 14D] FIG. 14D is a cross-sectional view of a preformed product in a second region schematically showing one step following the step of FIG. 14B.
[FIG. 14E] FIG. 14E is a cross-sectional view of a preformed product in the first region, schematically showing one step following the step of FIG. 14C.
[FIG. 14F] FIG. 14F is a cross-sectional view of a preformed product in a second region schematically showing one step following the step of FIG. 14D.
FIG. 14G is a cross-sectional view of a preformed product in the first region, schematically showing one step following the step of FIG. 14E.
[FIG. 14H] FIG. 14H is a cross-sectional view of a preformed product in a second region schematically showing one step following the step of FIG. 14F.
FIG. 15 is a cross-sectional view schematically showing an example of an apparatus that can be used in the manufacturing method of the present embodiment.
FIG. 16A is a cross-sectional view schematically showing the shape of the sample 1 used in the first embodiment in the first region.
FIG. 16B is a cross-sectional view schematically showing the shape of the sample 2 used in the first embodiment.
FIG. 16C is a cross-sectional view schematically showing the shape of the sample 3 used in the first embodiment.
FIG. 17 is a diagram schematically showing a three-point bending test simulated in an example.
FIG. 18A is a cross-sectional view schematically showing an example of a shape change of sample 1 in the simulation of the first embodiment.
FIG. 18B is a cross-sectional view schematically showing an example of a shape change of sample 2 in the simulation of the first embodiment.
FIG. 18C is a cross-sectional view schematically showing an example of a shape change of a sample 3 in the simulation of the first embodiment.
[FIG. 18D] FIG. 18D is a cross-sectional view schematically showing an example of a shape change of a sample 4 in the simulation of the first embodiment.
[FIG. 19A] FIG. 19A is a graph schematically showing an example of the amount of energy absorbed by each sample in the simulation of Example 1.
FIG. 19B is a graph schematically showing another example of the energy absorption amount of each sample in the simulation of Example 1.
[FIG. 20A] FIG. 20A is a graph schematically showing an example of the amount of energy absorbed by each sample in the simulation of Example 2.
FIG. 20B is a graph schematically showing another example of the energy absorption amount of each sample in the simulation of Example 2.
FIG. 21A is a cross-sectional view schematically showing an example of a sample shape change in the simulation of the second embodiment.
FIG. 21B is a cross-sectional view schematically showing another example of the shape change of the sample in the simulation of the second embodiment.
FIG. 22A is a cross-sectional view schematically showing another example of the shape change of the sample in the simulation of the second embodiment.
FIG. 22B is a cross-sectional view schematically showing another example of the shape change of the sample in the simulation of the second embodiment.
Embodiment for carrying out the invention
[0021]
As a result of diligent studies to obtain a molded product with high strength and high characteristics in the three-point bending test while being a molded product with a high degree of design freedom, the present inventors have improved the characteristics against collision by a specific structure. I found a new thing to do.
[0022]
Hereinafter, the present invention made based on the above new findings will be described based on specific embodiments. In the following description, embodiments of the present invention will be described with reference to examples, but it is obvious that the present invention is not limited to the examples described below.
In the following description, specific numerical values ​​and materials may be exemplified, but other numerical values ​​and materials may be applied as long as the effects of the present invention can be obtained.
[0023]
(First Embodiment)
Hereinafter, the press-molded product 100 according to the first embodiment of the present invention will be specifically described.
[0024]
FIG. 1 schematically shows a perspective view of the press-molded product 100 according to the present embodiment. As shown in FIG. 1, the press-molded product 100 according to the present embodiment has a top plate portion 111, two vertical wall portions 113, two projecting portions 115, and two flange portions 117.
The top plate is a horizontal wall that connects two vertical walls. Therefore, in this specification, the top plate portion can be read as the side wall portion. When the press-molded product is arranged with the side wall portion (top plate portion) facing downward, the side wall portion can also be referred to as a bottom plate portion. However, in this specification, the side wall portion is referred to as a top plate portion based on the case where the side wall portion is arranged above.
Further, in the following description, the material axial direction of the press-molded product 100 may be referred to as the longitudinal direction, and the direction perpendicular to the longitudinal direction and along the top plate portion 111 may be referred to as the width direction. Further, among the directions perpendicular to the longitudinal direction and the width direction, the top plate portion side may be referred to as an upper portion, and the flange portion side may be referred to as a lower portion.
[0025]
The press-formed product 100 is formed by deforming one steel plate 101 (material steel plate). Specifically, as will be described later, it is manufactured by press-molding one material steel plate.
[0026]
As the steel plate constituting the press-formed product 100 of the present embodiment, TRIP steel, composite structure steel, hot stamping steel plate, precipitation reinforced steel and the like can be used.
The tensile strength of the press-molded product 100 may be 590 MPa or more, 780 MPa or more, 980 MPa or more, or 1200 MPa or more. The upper limit of the tensile strength of the press-molded product 100 is not particularly limited, but is, for example, 2500 MPa. When the one-step manufacturing method described later is performed by hot stamping, or when the second step in the two-step manufacturing method is performed by hot stamping, the tensile strength of the press-formed product 100 is set to that of the steel plate (blank) as the material. It can be higher than the tensile strength.
[0027]
In addition, the tensile strength of the press-molded product 100 is equal to or higher than the above value. In other words, in the metal structure of the press-molded product 100, the martensite structure is 20% or more in volume ratio, and the tensile strength of the press-molded product is 20% or more. It is a metal structure that occupies 90% or more when it is 1310 MPa or more or when it is hot stamped.
For example, when the press-molded product 100 has a tensile strength of 1500 MPa or more and a martensite structure of 90% or more in volume ratio, the Vickers hardness of the protruding portion 115 may be 454 or more. Further, the ratio of the Vickers hardness in the protruding portion to the Vickers hardness in the vertical wall portion at this time may be 0.95 or more.
[0028]
As shown in FIG. 1, the press-molded product 100 has a long shape in which the top plate portion 111, the vertical wall portion 113, the protruding portion 115, and the flange portion 117 all extend in the longitudinal direction. Of these, the top plate portion 111, the vertical wall portion 113, and the flange portion 117 each extend in a flat plate shape over the entire length in the longitudinal direction. The protrusion 115 extends in a flat plate shape only in a part in the longitudinal direction.
In the following description, in the longitudinal direction of the press-molded product 100, the region where the protrusion 115 is provided is defined as the protrusion region P1, and the protrusion 115 is provided.The non-protruding region is defined as the non-protruding region P2.
[0029]
Here, FIG. 2A is a cross-sectional view taken along the line AA'of FIG. 1, schematically showing a cross section of a surface perpendicular to the longitudinal direction of the press-molded product 100 in the protruding region P1. Further, FIG. 2B is a cross-sectional view taken along the line BB'of FIG. 1, schematically showing a cross section of a surface perpendicular to the longitudinal direction of the press-molded product 100 in the non-protruding region P2.
[0030]
The length of the protruding region P1 in the longitudinal direction may be 30% or more of the total length in the longitudinal direction of the press-molded product 100. By setting the length of the projecting region P1 in the longitudinal direction of the press-molded product 100 to 30% or more of the total length in the longitudinal direction of the press-molded product 100, the height is high even if the projecting portion 115 is not provided over the entire length of the press-molded product 100. It is possible to obtain the effect of strength and high characteristics in the three-point bending test.
It is more preferable that the length of the protruding region P1 in the longitudinal direction of the press-molded product is 50% or more of the total length in the longitudinal direction of the press-molded product 100 from the viewpoint of strength.
[0031]
Hereinafter, the cross-sectional shape of the press-molded product 100 in the protruding region P1 will be described.
As shown in FIG. 2A, when a plane perpendicular to the longitudinal direction is viewed in cross section in the protruding region P1, the press-molded product 100 has a top plate portion 111, a vertical wall portion 113, a protruding portion 115, and a flange portion 117. The protruding portion 115 has a shape protruding outward from the boundary portion 112 of the corner portion connecting the top plate portion 111 and the vertical wall portion 113. The cross section (cross section perpendicular to the longitudinal direction) of the press-molded product 100 excluding the protruding portion 115 is in the shape of a hat.
As shown in FIG. 2A, the protruding portion 115 is formed by bending a steel plate protruding from a part of the top plate portion 111 in the longitudinal direction and a part of the vertical wall portion 113 in the longitudinal direction at the tip portion 115t. The overlapping portion 115d is present on at least the tip portion 115t side of the protruding portion 115. In the present embodiment, the "overlapping portion 115d" is a portion where the steel plates are doubly overlapped in the protruding portion 115. The overlapped portion 115d has a plate-like shape as a whole.
More specifically, as shown in FIG. 2A, the projecting portion 115 has a portion 115a extending outward from both ends in the width direction of the top plate portion 111 and a portion 115b extending outward from the upper end of the vertical wall portion 113. And are configured to overlap each other.
In the configuration shown in FIG. 2A, the portion 115a is formed by extending outward from both ends in the width direction of the top plate portion 111 in the same plane as the top plate portion 111. The portion 115b is formed by bending outward from the upper end of the vertical wall portion 113 and extending outward.
Part 115a and part 115b are each part of the steel plate 101. The portion 115a is bent in the opposite direction at the tip portion 115t to become the portion 115b.
[0032]
The protruding portion 115 is a region other than the tip portion 115t, and a part of the steel plate constituting the protruding portion 115 is curved but not bent. That is, except for the tip portion 115t, the protruding portion 115 does not have a ridge line portion that protrudes toward the outside of the protruding portion 115. Therefore, the press-molded product 100 is different from the parts described in Patent Documents 4 and 5.
Further, the overlapping portion 115d is not rounded into a tubular shape, and the protruding portion 115 is different from the reinforcing portion rounded into a tubular shape shown in FIG. 6 of Patent Document 6.
Further, the protruding portion 115 has a shape different from that of the corner portion formed in the oval concave shape or the convex shape described in FIGS. 1 and 2 of Patent Document 7.
[0033]
In the protruding portion 115, the portion 115a and the portion 115b may be overlapped and brought into close contact with each other. With such a configuration, the strength of the protruding portion 115 can be further improved. The structure in which the site 115a and the site 115b are in close contact with each other can be obtained by a manufacturing method described later.
[0034]
In the protruding portion 115, the portion 115a and the portion 115b may be fixed by a joining means. For example, the portions 115a and the portions 115b overlapping in the overlapped portion 115d may be welded by resistance spot welding or laser welding. Further, on the lower end side of the protruding portion 115 (the boundary between the top plate portion and the vertical wall portion and the protruding portion), the portion 115a and the portion 115b may be arc-welded (fillet welded). The joining means may be any of adhesive, brazing, rivet, bolting, and friction stirring joining. For example, the regions A and / or the regions B shown in FIG. 3 may be joined. The region A shown in FIG. 3 is a region other than the end portion of the protruding portion 115, and may be performed by resistance spot welding or laser welding. The welding (fillet welding) of the region B at the boundary between the protrusion 115 and the other portion may be performed by arc welding.
[0035]
As shown in FIG. 2A, in the press-molded product 100 according to the present embodiment, the angle Y formed by the top plate portion 111 and the vertical wall portion 113 is 90 when a surface perpendicular to the longitudinal direction is viewed in cross section in the protruding region P1. It is said to be about ° to 100 °. The angle Y may be less than 90 °, but is preferably 90 ° or more, and is particularly preferably in the range of 90 ° to 150 °. The two angles Y formed by the top plate portion 111 and the respective vertical wall portions 113 may be different, but the difference between the two is preferably within 10 °, and particularly preferably the same angle.
[0036]
As shown in FIG. 2A, in the press-molded product 100 according to the present embodiment, the angle X formed by the top plate portion 111 and the protruding portion 115 is 180 °. The angle X is an angle formed by a surface including the outer surface 111s of the top plate portion 111 and a surface including the surface 115ds of the overlapping portion 115d which is a part of the protruding portion 115 (the surface of the portion 115a in the overlapping portion 115d). To say. When, for example, minute irregularities are formed on the top plate portion 111 and a part of the top plate portion 111 is not flat, the angle when the top plate portion 111 as a whole is regarded as a flat plate is the angle of the top plate portion 111. And.
As shown in FIGS. 1 and 2A, the press-molded product 100 according to the present embodiment has an angle X of 180 °, so that the top plate portion 111 and the protruding portion 115 are parallel to each other. In a preferable example when the angle X is 180 °, there is no step between the portion 115a extending from the top plate portion 111 and the top plate portion 111.
[0037]
The angle X is not limited to 180 °, and may be set in a range of 90 ° or more and 180 ° or less, for example, 105 ° or 135 °. That is, the angle X may be, for example, 145 ° as shown in FIG. 4A, which is a cross-sectional view of a modified example of the press-molded product 100. When the angle X is larger than 90 °, when the press-molded product 100 is viewed from above the top plate portion 111 along the direction perpendicular to the plate surface of the top plate portion 111, the portion 115b constituting the protruding portion 115 is a portion. It is obscured by 115a. Such a portion is sometimes called a negative angle portion. From another point of view, the negative angle portion is a portion having a reverse gradient when an attempt is made to press-mold only with the upper mold and the lower mold.
[0038]
When the press-molded product 100 of the present embodiment is used as a structural member, the top plate portion 111 and the flange portion 117 may be used by being fixed to a part of other members. In that case, it may be preferable that the angle X is 180 ° as shown in FIG. 2A. When the angle X is 180 ° and the surface of the top plate portion 111 and the surface of the protruding portion 115 are flush with each other, it may be easy to fix the top plate portion 111 side to another member. Further, when a load is applied from the top plate portion 111 side, the load can be easily supported by the entire top plate portion 111 and the protruding portion 115.
[0039]
The protruding portion 115 protrudes from both ends of the top plate portion 111, but the difference between the two angles X formed by the respective protruding portion 115 and the top plate portion 111 is preferably within 10 °, which is the same. The angle is particularly preferred. Further, their shapes in the vertical cross section of each protrusion 115 in the longitudinal direction do not have to be line symmetric, but are preferably formed in line symmetry.
[0040]
As shown in FIG. 4B, in the present embodiment, the length of the protruding portion 115 in the cross section perpendicular to the longitudinal direction is defined as "length D". That is, when a surface perpendicular to the longitudinal direction of the press-molded product 100 is viewed in cross section, the protrusion 115 from the boundary point 112p where the extension lines of the top plate portion 111 and the vertical wall portion 113 intersect, as shown in FIG. 4B. The length up to the tip portion 115t of the above is defined as "length D".
[0041]
The length D is preferably 3 mm or more from the viewpoint of ensuring rigidity. If the length D is less than 3 mm, the force that the vertical wall portion 113 tries to fall inward becomes too small, and the rigidity of the press-molded product 100 becomes insufficient, which is not preferable. The length D can be appropriately set according to the thickness of the steel plate and the size of the press-formed product 100, and can be appropriately set, for example, 5 mm or more, 10 mm or more, 15 mm or more, 25 mm, or the like. The lengths D of the two protrusions 115 may be the same or different.
[0042]
As shown in FIG. 4B, the length D1 of the overlapped portion 115d in the cross section perpendicular to the longitudinal direction may be in the range of 0.1 to 1 times the length D of the protruding portion 115, and is 0.5 to 1. It is preferably in the double range. Since the length D of the projecting portion 115 is in the range of 0.1 to 1 times, the stress applied to the press-molded product 100 is concentrated on the superposed portion 115d, and the rigidity of the press-molded product 100 is sufficiently maintained. Specifically, the length D1 of the overlapped portion 115d may be appropriately set according to the manufacturing conditions, such as 0.3 times or 0.8 times the length D of the protruding portion 115.
[0043]
The corner portion of the boundary between the portion 115b and the vertical wall portion 113 in the protruding portion 115 is preferably a curved surface when a surface perpendicular to the longitudinal direction of the press-molded product 100 is viewed in cross section. By making the corner portion curved, buckling at the corner portion can be suppressed.
The radius of curvature of the corner on a plane perpendicular to the longitudinal direction is in the range of 0.1 to 1 times the length D (for example, in the range of 0.2 to 0.8 times or 0.2 to 0.5 times). It may be in the range). For example, when the angle X is smaller than 180 °, the corner portion of the boundary between the portion 115a of the protruding portion 115 and the top plate portion 111 may be a curved surface.
[0044]
As shown in the cross-sectional view of FIG. 2B, the recess 120 is provided in the top plate portion 111 in the non-protruding region P2.
In the above-mentioned protruding region P1, as shown in FIG. 2A, the top plate portion 111 connects two vertical wall portions 113 adjacent to the top plate portion 111 via the two protruding portions 115. On the other hand, in the non-protruding region P2, as shown in FIG. 2B, since the protruding portion 115 is not provided, the top plate portion 111 has two adjacent vertical wall portions 113 extending downward directly from both ends thereof. ..
[0045]
In the press-molded product 100 of FIG. 1, the protruding portion 115 is not formed in the non-protruding region P2 at both ends in the longitudinal direction, and the protruding portion 115 is formed in the central protruding region P1 in the longitudinal direction. With this configuration, when the press-molded product 100 is combined with another member to form a structural member, the other member is not restricted in shape and desired collision safety performance can be obtained.
It should be noted that, as shown in FIG. 1, a press-formed product 100 in which a protrusion is formed only in a part in the longitudinal direction can be manufactured from a single material steel plate by a manufacturing method described later.
[0046]
As shown in the cross-sectional views of FIGS. 2A and 2B, in the protruding region P1 and the non-protruding region P2, the corner portion 116 connecting the vertical wall portion 113 and the flange portion 117 preferably has a rounded shape. Since the corner portion 116 has a rounded shape, buckling at the corner portion 116 can be suppressed.
[0047]
In the present embodiment, the area surrounded by the top plate portion 111, the two vertical wall portions 113, and the virtual surface connecting the lower ends of the two vertical wall portions 113 is "inside the press-molded product 100". It is called. Further, the region on the side opposite to the inside of the top plate portion 111 and the vertical wall portion 113 is referred to as "outside of the press-molded product 100". As shown in FIG. 2A, the “inner surface peripheral length α” refers to the following distances L1 and L along the inner peripheral side of the press-molded product 100.It is the total of 2 and L3.
L1: Distance between the end of one vertical wall portion 113 on the flange portion 117 side and the boundary point where the extension lines of one vertical wall portion 113 and the top plate portion 111 intersect.
L2: Between the boundary point where the extension lines of one vertical wall portion 113 and the top plate portion 111 intersect and the boundary point where the extension lines of the top plate portion 111 and the other vertical wall portion 113 intersect. distance
L3: Distance between the boundary point where the extension lines of the top plate portion 111 and the other vertical wall portion 113 intersect and the end portion of the other vertical wall portion 113 on the flange portion 117 side.
On the other hand, the "inner surface peripheral length β" is the inner peripheral side of the press-molded product 100 from the end of one vertical wall portion 113 on the flange portion 117 side to the end of the other vertical wall portion 113 on the flange portion 117 side. The distance along.
[0048]
In the example shown in FIG. 2B, the cross section of the recess 120 has a rectangular shape including two wall portions 120a and a bottom portion 120b. However, the cross-sectional shape of the recess is not limited to this, and the inner surface peripheral length α of the cross section in the protruding region P1 and the inner surface peripheral length β of the cross section in the non-protruding region P2 have 1.01 ≦ β / α ≦ 1.50. It suffices to be satisfied, and more preferably 1.01 ≦ β / α ≦ 1.20. If 1.01 ≦ β / α ≦ 1.50 is satisfied, the cross-sectional shape of the recess is not limited to a rectangular shape including the wall portion 120a and the bottom portion 120b, and for example, the two wall portions 120a are directly at the upper end. It may be a wedge shape to be connected, or the cross-sectional shape of the top plate portion 111 or the bottom portion 120b may be a shape including a curve such as a semi-circular shape or a semi-elliptical shape.
[0049]
The manufacturing method will be described later, but as shown in FIGS. 10C and 10D, the lengths of the inner circumferences of the protruding region P1 and the non-protruding region P2 are the same during the manufacturing of the press-molded product 100, respectively. However, as shown in FIG. 10G, the surplus of the top plate portion 111 in the protruding region P1 becomes the protruding portion 115, and as shown in FIG. 10H, the top plate portion 111 is recessed to become the non-protruding region P2. The inner surface peripheral length α of the protruding region P1 of 100 and the inner surface peripheral length β of the non-protruding region P2 are different values. That is, in the pressed molded product 100 which is a finished product, the difference between the inner surface peripheral length α of the protruding region P1 and the inner surface peripheral length β of the non-protruding region P2 depends on the length of the steel plate spent on the protruding portion 115. .. Therefore, when β / α is small, the length of the superposed portion 115d is short (the protruding portion 115 is small), and when β / α is large, the length of the superposed portion 115d is long (the protruding portion 115 is large).
Therefore, if β / α is less than 1.01, the length of the overlapped portion 115d in the protruding direction is insufficient, and sufficient strength cannot be secured in the protruding portion 115. Therefore, the rigidity of the protruding region P1 cannot be sufficiently increased, which is not preferable. On the other hand, when β / α exceeds 1.50, the length of the overlapped portion 115d in the protruding direction becomes too long, so that the rigidity of the protruding portion 115 becomes too high as compared with the non-protruding region P2. Therefore, stress tends to be concentrated on the boundary between the protruding portion 115 and the non-protruding region P2, which is not preferable.
In other words, by satisfying 1.01 ≦ β / α ≦ 1.50, the rigidity of the protruding region P1 can be sufficiently increased, and the stress concentration at the boundary between the protruding portion 115 and the non-protruding region P2 is prevented. Therefore, it is possible to improve the characteristics in the high-strength and three-point bending test.
In order to maintain the strength of the protruding portion 115 and avoid stress concentration at the boundary between the protruding portion 115 and the non-protruding region P2, 1.01 ≦ β / α ≦ 1.20 is particularly preferable. ..
[0050]
The press-molded product 100 according to the present embodiment is designed to satisfy 1.01 ≦ β / α ≦ 1.50 by forming a recess 120 in the top plate portion 111 in the non-protruding region P2. , The structure in which the top plate portion 111 includes the enlarged top plate portion 111'as in the press-molded product 100A according to the modified example shown in FIG. 5 instead of the concave portion 120, or the press-molded product according to the modified example shown in FIG. By configuring the vertical wall portion 113 to include the enlarged vertical wall portion 113'as in 100B, it may be designed to satisfy 1.01 ≦ β / α ≦ 1.50. The press-molded product 100A and the press-molded product 100B will be described below.
[0051]
In the press-molded product 100A according to the modified example shown in FIG. 5, the protruding region P1 is configured in the same manner as the press-molded product 100, but in the non-protruding region P2, the top plate portion 111 is connected to the vertical wall portion 113. By having the plate portion 111', the two vertical wall portions 113 protrude toward the outside of the press-molded product 100A from the two vertical wall portions 113 in the protruding region P1.
In other words, the press-molded product 100A shown in FIG. 5 has an enlarged top plate portion 111 ′ extending from the top plate portion 111 and continuing to the end edge of the vertical wall portion 113 in the non-protruding region P2. Regarding the top plate portion 111, the plate surface of the top plate portion 111 in the protruding region P1 and the plate surface of the top plate portion 111 in the non-projecting region P2 are in the same plane. The fact that the plate surface of the top plate portion 111 is in the same plane in the protruding region P1 and the non-projecting region P2 means that, for example, the outer or inner plate surface of this portion exists in the same plane.
[0052]
In this press-molded product 100A, the total value α of the inner surface peripheral lengths of the top plate portion 111 and the vertical wall portion 113 in the cross section perpendicular to the longitudinal direction in the protruding region P1 and the total value α of the inner surface peripheral length in the non-protruding region P2 are perpendicular to the longitudinal direction. A press-molded product by satisfying 1.01 ≤ β / α ≤ 1.50 for the total value β of the inner surface peripheral lengths of the top plate portion 111 including the enlarged top plate portion 111'in the cross section and the vertical wall portion 113. Similar to 100, it has high strength and can enhance the characteristics in the three-point bending test.
The press-molded product 100A shown in FIG. 5 can also be manufactured from a single material steel plate by the manufacturing method described later. The press-molded product 100A has a shape in which the width (peripheral length) of the flange portion 117 in the non-protruding region P2 is larger than the width (peripheral length) of the flange portion 117 in the protruding region P1.
[0053]
In the press-molded product 100B according to the modified example shown in FIG. 6, the protruding region P1 is configured in the same manner as the press-molded product 100, but in the non-protruding region P2, the vertical wall portion 113 is continuous with the top plate portion 111. By having the wall portion 113', the top plate portion 111 protrudes toward the outside of the press-molded product 100B from the top plate portion 111 in the protruding region P1.
In other words, the press-molded product 100B shown in FIG. 6 has an enlarged vertical wall portion 113'extending from the vertical wall portion 113 and continuing to the end edge of the top plate portion 111 in the non-protruding region P2. Regarding the vertical wall portion 113, the plate surface of the vertical wall portion 113 in the protruding region P1 and the plate surface of the vertical wall portion 113 in the non-projecting region P2 are in the same plane. The fact that the plate surface of the vertical wall portion 113 is in the same plane in the protruding region P1 and the non-projecting region P2 means that, for example, the outer or inner plate surface of this portion exists in the same plane.
[0054]
In this press-molded product 100B, the total value α of the inner surface peripheral lengths of the top plate portion 111 and the vertical wall portion 113 in the cross section perpendicular to the longitudinal direction in the protruding region P1 and the total value α of the inner surface peripheral length in the non-protruding region P2 are perpendicular to the longitudinal direction. A press-molded product by satisfying 1.01 ≤ β / α ≤ 1.50 for the total value β of the inner surface peripheral lengths of the top plate portion 111 and the vertical wall portion 113 including the enlarged vertical wall portion 113'in the cross section. Similar to 100, it has high strength and can enhance the characteristics in the three-point bending test.
The press-molded product 100B shown in FIG. 6 can also be manufactured from a single material steel plate by the manufacturing method described later.
[0055]
A transition region (not shown) may be provided at the boundary between the protruding region P1 and the non-protruding region P2. In this transition region, the length from the boundary point 112p to the tip portion 115t of the protruding portion 115 may be gradually reduced from the protruding region P1 side to the non-protruding region P2 side. In the transition region, the size of the recess shown in FIG. 1 or FIG. 2B or the depth from the top plate portion 111 may be gradually reduced.
Further, the press-molded product 100A according to the modified example shown in FIG. 5 has a transition vertical wall portion 113a connecting the two vertical wall portions 113 of the non-protruding region P2 and the two vertical wall portions 113 of the protruding region P1. May be. Further, the press-molded product 100B according to the modification shown in FIG. 6 may have a transition top plate portion 111a connecting the top plate portion 111 of the non-protruding region P2 and the top plate portion 111 of the protruding region P1. .. The transition region may be included in either the protruding region P1 or the non-protruding region P2.
[0056]
From the viewpoint of formability, the length of the transition region in the longitudinal direction of the press-molded product may be set to about 20% of the total length in the longitudinal direction of the molded product 100. Alternatively, the transition region may be designed to be extremely small in consideration of the design of the molded product 100.
[0057]
The press-molded product 100 according to the present embodiment and the press-molded products 100A and 100B which are variants thereof have high strength, high characteristics in the three-point bending test, and a high degree of design freedom. Therefore, the press-molded product of the present embodiment can be used for various purposes. For example, it can be used as a structural member of various means of transportation (automobile, two-wheeled vehicle, railroad vehicle, ship, aircraft) and a structural member of various machines. Examples of automotive structural members include side sills, pillars (front pillars, front pillar lowers, center pillars, etc.), roof rails, roof arches, bumpers, beltline reinforcements, and door impact beams, and other structures. It may be a member.
[0058]
As shown in FIG. 2A, in the press-molded product 100 according to the present embodiment, the two flange portions 117 extend horizontally from the lower ends of the two vertical wall portions 113 toward the outside. That is, the flange portion 117 is parallel to the top plate portion 111.
The press-molded product 100 may have a shape that does not include the flange portion 117 by cutting the flange portion 117. That is, it may be a molded product composed of a top plate portion 111, a vertical wall portion 113, and a protruding portion 115.
[0059]
(Second Embodiment)
Hereinafter, the structural member 200 according to the second embodiment of the present invention will be described with reference to FIGS. 7A to 9B.
As shown in FIGS. 7A to 7C, the press-molded product 100 described in the first embodiment described above is used as a structural member 200 for automobile parts and other uses by forming a closed cross section in combination with a steel plate member. Also, as shown in FIG. 7D, it can be used as it is as a structural component.
As shown in FIGS. 7A to 7C, the structural member 200 according to the present embodiment is configured to form a closed cross section by combining the press-formed product 100 described in the first embodiment and the steel plate member 201. .. That is, the press-formed product 100 and the steel plate member 201 form a hollow body.
In the description of this embodiment, the case where the press-molded product 100 according to the first embodiment is used is illustrated, but the press-molded products 100A and 100B may be used.
[0060]
7A to 7C are views showing structural members 200a, 200b, and 200c as specific examples of the structural member 200, and is a diagram schematically showing a cross section perpendicular to the longitudinal direction in the protruding region P1. The angle Y formed by the top plate portion 111 and the vertical wall portion 113 of the press-molded product 100 is set to 90 ° for the sake of simplicity of explanation.
[0061]
In the structural member 200a shown in FIG. 7A, the back plate (steel plate) 201a is used as the steel plate member 201. The back plate 201a is welded to the two flange portions 117 of the press-molded product 100.
In the structural member 200b shown in FIG. 7B, a press-molded product 201b having a hat-shaped cross section is used as the steel plate member 201. The press-molded product 100 and the press-molded product 201b are arranged so that their inner regions face each other, and the flange portion 117 of the press-molded product 100 and the flange portion 217 of the press-molded product 201b are welded to each other.
In the structural member 200c shown in FIG. 7C, the press-molded product 201c, which differs only in the dimensions of the vertical wall portion from the press-molded product 100, is used as the steel plate member 201. The press-molded product 100 and the press-molded product 201c are arranged so that their inner regions face each other, and the flange portion 117 of the press-molded product 100 and the flange portion 217 of the press-molded product 201c are welded to each other.
In this way, the steel plate member 201 is a press-molded product.It is fixed to the two flange portions 117 so as to connect the two flange portions 117 of 100. The steel plate member 201 is not limited to the above-mentioned example, and may include other molded products.
[0062]
The fixing method between the press-formed product 100 and the steel plate member 201 is not particularly limited, and an appropriate fixing method may be selected according to the situation. Examples of fixing methods include at least one selected from the group consisting of welding, adhesives, brazing, rivets, bolting, and friction-stirring joints. Among these, welding is easy to carry out. Examples of welding include resistance spot welding and laser welding.
[0063]
Further, the structural member 200 according to the present embodiment may include an auxiliary member 601 joined via the joint portion 602 as shown in FIGS. 8A to 8D. 8A to 8D are views showing a state in which auxiliary members 601 having a U-shaped cross-sectional view perpendicular to the longitudinal direction are joined to the structural member 200 at different joining portions 602. The joint 602 may be configured by any of welding, adhesives, brazing, rivets, bolting, and frictional stirring joints.
The auxiliary member 601 is a long member, and the longitudinal direction of the press-molded product 100 and the longitudinal direction of the auxiliary member 601 are arranged in parallel.
[0064]
In the example shown in FIG. 8A, the auxiliary member 601 is joined to the structural member 200 via a joint portion 602 provided on each of the top plate portion 111 and the two vertical wall portions 113.
In the example shown in FIG. 8B, the auxiliary member 601 is joined to the structural member 200 via a joint portion 602 provided in each of the two vertical wall portions 113. A joint portion 602 is not provided between the top plate portion 111 and the auxiliary member 601. The top plate portion 111 and the auxiliary member 601 may be arranged so as to be in close contact with each other, or may be arranged so as to form a gap.
In the example shown in FIG. 8C, the auxiliary member 601 is joined to the structural member 200 via the joint portion 602 provided on the top plate portion 111. A joint portion 602 is not provided between the two vertical wall portions 113 and the auxiliary member 601. The vertical wall portion 113 and the auxiliary member 601 may be arranged so as to be in close contact with each other, or may be arranged so as to form a gap.
In the example shown in FIG. 8D, the auxiliary member 601 is joined to the structural member 200 via a joint portion 602 provided in each of the two vertical wall portions 113. A space is provided between the top plate portion 111 and the upper surface of the auxiliary member 601.
[0065]
Further, FIGS. 9A and 9B are views for explaining a case where the auxiliary member 701 is used as a modification of the auxiliary member 601. FIG. 9B is a diagram schematically showing a cross section perpendicular to the longitudinal direction of the structural member 200 in the protruding region P1. It is a figure which shows. As shown in FIGS. 9A and 9B, an auxiliary member 701 having an L-shaped cross-sectional view perpendicular to the longitudinal direction can be used instead of the auxiliary member 601. The auxiliary member 701 is a long member, and the longitudinal direction of the press-molded product 100 and the longitudinal direction of the auxiliary member 701 may be arranged in parallel.
In the example shown in FIG. 9A, two auxiliary members 701 are joined to each of the top plate portion 111 and the two vertical wall portions 113 via the joint portion 702.
In the example shown in FIG. 9B, two auxiliary members 701 are joined to the top plate portion 111 via the joint portion 702. No joint 702 is provided between the two vertical wall portions 113 and the two auxiliary members 701. The vertical wall portion 113 and the auxiliary member 701 may be arranged in close contact with each other, or may be arranged so as to form a gap.
The joint portion 702 may be composed of any of welding, adhesive, brazing, rivet, bolt tightening, and friction stirring joint.
[0066]
The auxiliary member 601 or the auxiliary member 701 described above may be arranged over the entire longitudinal direction of the structural member 200, and may be arranged only in a part of the press-molded product 100 in the longitudinal direction so as to include, for example, the protruding region P1. May be good. Alternatively, it may be arranged in a part of the press-molded product 100 in the longitudinal direction so as to include the non-protruding region P2.
[0067]
The structural member 200 according to the present embodiment has a high strength and a three-point bending test because the press-formed product 100 having the protruding region P1 only in a part in the longitudinal direction and the steel plate member 201 form a closed cross section. High characteristics and high degree of design freedom.
Further, when an auxiliary member is further provided, the collision characteristics are further improved. More specifically, in the structural member 200, the vertical wall portion 113 of the press-molded product 100 collapses so as to move inward at the time of collision. Therefore, by adding the auxiliary members 601 and 701, the collapse can be suppressed. It becomes possible and the collision characteristics are further improved.
The strength of the auxiliary member 601 or 701 is preferably high, but the material of the auxiliary member 601 or 701 may be a polymer material, a foamed resin, or the like, as long as it contributes to the suppression of the inward collapse as described above. It may be non-metal.
In addition, in the conventional press-molded product, the vertical wall collapses to the outside, so that it is easy to break at the joint between the press-molded product and the auxiliary member. However, in the press-molded product 100 described in the first embodiment, since the vertical wall portion 113 collapses inward, breakage is unlikely to occur at the joint portion 602 of the auxiliary member 601 as shown in FIGS. 8A to 8D.
[0068]
In the structural member 200 according to the present embodiment, only a part of the flange portion 117 of the press-formed product 100 may be fixed to the steel plate member 201. In that case, the other portion of the flange portion 117 is not fixed to the steel plate member 201. For example, of the flange portions 117 of the press-formed product 100, only the flange portions 117 near both ends in the longitudinal direction may be fixed to the steel plate member 201, and the other flange portions 117 may not be fixed to the steel plate member 201.
[0069]
(Third Embodiment)
Hereinafter, a method for manufacturing a press-molded product according to a third embodiment of the present invention will be described. In the manufacturing method according to the present embodiment, the first example of the method for manufacturing the press-molded products 100, 100A, 100B described in the first embodiment will be described. According to the manufacturing method according to the present embodiment, the first step for obtaining the deformed steel plate as an intermediate product and the second step for obtaining the press-molded product 100 as a final product are both carried out by one device. It is possible to do.
[0070]
In the following, the steel plate (material steel plate) that is the starting material may be referred to as "blank". The blank is a flat plate-shaped steel plate and has a planar shape corresponding to the shape of the press-molded product to be manufactured. The thickness and physical properties of the blank are selected according to the properties required for the press-molded product. For example, when the press-molded product 100 is a structural member for an automobile, a blank corresponding to the structure member is selected. The thickness of the blank may be in the range of, for example, 0.4 mm to 4.0 mm, or may be in the range of 0.8 mm to 2.0 mm.
The wall thickness of the press-molded product 100 is determined by the thickness of the blank and the processing process, and may be within the range of the thickness of the blank exemplified here.
[0071]
The blank is a high tension steel plate (high ten material) having a tensile strength of 340 MPa or more (for example, a tensile strength of 500 to 800 MPa or more, 490 MPa or more, 590 MPa or more, 780 MPa or more, 980 MPa or more, or 1200 MPa or more) when hot press molding is performed. It is preferable to have. In order to reduce the weight while maintaining the strength as a structural member, it is preferable that the tensile strength of the molded product is high, and a blank of 590 MPa or more (for example, 780 MPa or more, 980 MPa or more, or 1180 MPa or more) is used. preferable. The upper limit of the tensile strength of the blank is not limited, and in one example, it is 2500 MPa or less. The tensile strength of the press-formed product of the present embodiment is equal to or higher than the tensile strength of the blank, and may be in the range exemplified here.
[0072]
When the tensile strength of the material steel plate (blank) is 590 MPa or more, in order to obtain a press-formed product equal to or higher than the blank, hot press molding (hot stamping, hot pressing) is performed in which the material steel plate is heated in advance. Also referred to as). Even when a blank having a tensile strength of less than 590 MPa is used, the second step may be performed by hot stamping. When performing hot stamping, a blank having a known composition suitable for the hot stamping may be used.
[0073]
When the tensile strength of the blank is 590 MPa or more and the wall thickness is 1.4 mm or more, it is particularly preferable to perform molding by hot stamping in order to prevent cracking at the protruding portion even if the blank has low ductility. ..
For the same reason, when the tensile strength of the blank is 780 MPa or more and the wall thickness is 0.8 mm or more, it is particularly preferable to perform molding by hot stamping. Since the heated steel plate has high ductility, cracking is unlikely to occur even if the wall thickness of the blank is 3.2 mm when molding is performed by hot stamping.
[0074]
When the tensile strength of the blank is high, cracks are likely to occur at the tip of the protruding part in the cold press. Therefore, when the tensile strength of the steel plate after molding is 1200 MPa or more (for example, 1500 MPa or more or 1800 MPa or more), it is more preferable to perform molding by hot stamping. Even when the tensile strength of the steel plate after molding is less than 1200 MPa, it may be molded by hot stamping.
Further, when the tensile strength of the blank is 780 MPa or more, if the shape of the press-molded product of the above embodiment is obtained by cold pressing, wrinkles or cracks may occur in the protruding portion or the like. However, in the method for producing a press-molded product of the present invention, by performing molding by hot stamping, the shape of the press-molded product of the above embodiment can be obtained even if the tensile strength of the blank is 780 MPa or more. That is, by performing a series of steps by hot stamping in one apparatus, a press-molded product having a tensile strength of 780 MPa or more can be manufactured.
[0075]
In hot stamping, the amount of C is preferably 0.09 to 0.40% by mass as the chemical composition of the blank in order to secure the desired strength. Similarly, Mn is also preferably 1.0 to 5.0% by mass. Similarly, B is also preferably 0.0005 to 0.0500% by mass.
The typical chemical composition of the blank having a tensile strength of 1500 MPa or more after quenching is not particularly limited, but C: 0.19 to 0.23% by mass, Si: 0.18 to 0.22% by mass, Mn: It is preferably 1.1 to 1.5% by mass, Al: 0.02 to 0.04% by mass, Ti: 0.015 to 0.030% by mass, and B: 0.0010 to 0.0020% by mass. For example, C: 0.20% by mass, Si: 0.20% by mass, Mn: 1.3% by mass, Al: 0.03% by mass, Ti: 0.020% by mass, B: 0.0015% by mass. Is.
[0076]
In the manufacturing method of this embodiment, when hot stamping is performed, the material steel plate is heated to a predetermined quenching temperature. The quenching temperature is higher than the A3 transformation point (more specifically, the Ac3 transformation point) at which the material steel plate to be a work piece is austenized, and may be, for example, 910 ° C. or higher. For heating the material steel plate, for example, a method of heating the material steel plate in a heating device such as a heating furnace or a method of energizing the material steel plate to heat it can be used. The range of the heating temperature is preferably a range of the Ac3 transformation point or more (Ac3 transformation point + 150 ° C.) or less in order to obtain an austenite single layer and suppress the decomposition of the austenite layer. In order to dissolve the charcoal in the steel plate, the heating temperature holding time is preferably 1 second or more and 300 seconds or less. When elements such as Mn, Cr, and Mo having good hardenability are added, it can be retained in a short time.
[0077]
Next, the heated material steel plate is pressed by the press device 40a or the like shown in FIG. 10A or the like. Since the material steel plate is heated, it is unlikely to crack even if it is greatly deformed. The temperature of the material steel plate at the start of pressing is preferably Ms point or more (Ac3 transformation point + 150 ° C.) or less in order to obtain a martensite single layer within the above heating temperature range... Further, in order to secure productivity and suppress the disappearance of Zn in the case of GA steel plate, the temperature rising rate is preferably 5 ° C./sec or more and 500 ° C./sec or less.
When pressing the material steel plate that is the work piece, the deformed material steel plate, that is, the molded product is rapidly cooled. By this quenching, the workpiece is hardened during the press processing. Quenching can be performed by providing a water cooling tube inside the mold or by ejecting water from the mold toward the molded product. The cooling rate when the molded product is rapidly cooled by the press device is preferably 20 ° C./sec or more and 200 ° C./sec or less in order to suppress the manufacturing cost and obtain the martensite single layer. For example, 30 ° C./sec or higher is more preferable.
The hot stamping procedure (heating, pressing, etc.) and the device used therein are not particularly limited, and known procedures and devices may be used.
[0078]
In this manufacturing method, press molding is performed using a press device including an upper mold, a lower mold, and two mobile molds that can move vertically and horizontally.
The lower mold includes a punch mold and two movable plates arranged so as to sandwich the punch mold and movable at least in the vertical direction. And it includes a step (Ia), a step (Ib), a step (IIa) and a step (IIb).
[0079]
Here, as the movable direction of the movable type, the vertical direction and the horizontal direction are not only one direction in the vertical direction and one direction in the mere horizontal direction, but also an oblique direction in which both the vertical direction and the horizontal direction overlap. May include.
[0080] [0080]
The process (Ia) is a process of arranging the material steel plate between the upper mold, the two mobile molds, and the lower mold.
Step (Ib) is the end of the material steel plate between the two mobile molds and the movable plate by lowering the two mobile molds with the two movable plates and moving the two mobile molds towards the punch mold. This is a process of obtaining a deformed steel plate with a portion sandwiched between them.
[0081]
Step (IIa) is a step of restraining a part of the deformed steel plate by the two moving molds and the side surface portion of the punch mold by further moving the two moving molds toward the punch mold.
In the step (IIb), a part of the deformed steel plate is pressed by the upper mold and the punch mold by lowering the upper mold, and at least a part of the protrusion corresponding portion is overlapped between the upper mold and the movable mold. Together, this is the process of forming a press-molded product.
[0082]
In the manufacturing method of the following embodiment, a through hole may be formed in a portion corresponding to the top plate portion. Then, in the step (IIa), the movement of the deformed steel plate may be suppressed by passing a pin protruding from the press mold through the through hole. The pin projects from either the upper or lower die of the press die.
On the other side of the press mold, a through hole through which the pin passes is formed. The through hole is generally formed at the blank stage, but may be formed at another stage before the second step of the fourth embodiment described later. Also in the first step of the fourth embodiment described later, the movement of the blank may be suppressed by passing the pin through the through hole.
[0083]
Hereinafter, the manufacturing method of the present embodiment will be described with reference to FIGS. 10A to 10H. The embodiments described below are examples, and the present invention is not limited to the following embodiments, and various variations described above can be applied. In the following description, similar parts may be designated by the same reference numerals and duplicate description may be omitted.
Further, in the following figure, for ease of understanding, a gap may be shown between the steel plates overlapped at the overlapped portion, but the steel plates overlapped at the overlapped portion are in close contact with each other. It is preferable to be there.
[0084]
In the following example, a manufacturing method in which hot press molding is performed in a state where the material steel plate is heated before the step (Ia) will be described. Therefore, in the steps (Ia) and (Ib), the state where the punch mold and the material steel plate, which will be described later, do not contact is maintained, and in the step (IIa), the state where the upper surface portion of the punch mold and the deformed steel plate do not contact is maintained. Maintain and perform hot press molding with one press device.
[0085]
FIG. 10A shows an example of the press device used in this manufacturing method. The press device 40a of FIG. 10A includes an upper mold 50, a lower mold 60, two mobile molds 51, and a plate 63. The two mobile 51s can move vertically and horizontally, respectively. The lower mold 60 includes a punch mold 61 and two movable plates 64 arranged so as to sandwich the punch mold 61 and movable in the vertical direction.
Note that FIG. 10A shows an example in which the movable plate 64 is connected to the plate 63 via the expansion / contraction mechanism 64a. As the expansion / contraction mechanism 64a, the mechanism exemplified for the expansion / contraction mechanism 61b can be used. The movable plate 64 may be moved independently of the movable type 51 by a driving device directly attached to the movable plate 64.
[0086]
The production method of the present embodiment includes the steps (Ia), (Ib), (IIa), and (IIb) described above.
The deformed steel plate 310 obtained in the step (Ib) has a long shape, has two vertical wall corresponding portions 310aw as two vertical wall portions, a top plate corresponding portion 310at as a top plate portion, and a protrusion. It includes a projecting portion corresponding portion 310ae to be a portion and two flange portion corresponding portions 310b to be two flange portions.
In the step (Ib), two flange portion corresponding portions 310b are sandwiched between the two movable molds 51 and the two movable plates 64.
[0087]
In the step (IIa), the two vertical wall corresponding portions 310aw are restrained by the two moving molds 51 and the side surface portions of the punch mold 61.
In the step (IIb), by lowering the upper die 50, the top plate equivalent portion 310 at is pressed by the upper die 50 and the punch die 61, and at the same time, it corresponds to the protruding portion between the upper die 50 and the movable die 51. At least a part of the portion 310ae is overlapped.
[0088]
An example of a manufacturing process for manufacturing the press-molded product 100 shown in FIG. 1 using the press device 40a will be described below.
[0089]
10A, 10C, 10E and 10G show cross-sectional views corresponding to the protruding region P1 of the molded product 100 obtained by the manufacturing method of the present embodiment. Further, FIGS. 10B, 10D, 10F and 10H show cross-sectional views in a corresponding cross section corresponding to the non-protruding region P2 of the molded product 100. That is, FIGS. 10A and 10B, FIGS. 10C and 10D, FIGS. 10E and 10F, and FIGS. 10G and 10H show the material steel plate B1, the deformed steel plate 310, the molded product 100, and the press device 40a at the same time, respectively. It shows a cross section. This also applies to FIGS. 11A to 11H and FIGS. 12A to 12F, which will be described later.
[0090]
The cross section of the press device 40a corresponding to the protruding region P1 of the molded product 100 is as shown in FIG. 10A and the like.
As shown in FIG. 10B and the like, in the cross-sectional portion of the press device 40a corresponding to the non-protruding region P2 of the molded product 100, the convex portion 50a for forming the concave portion 120 is formed into the upper mold 50, and the concave portion 61a is punched. Each is provided in the mold 61.
[0091]
First, as shown in FIGS. 10A and 10B, the material steel plate B1 is arranged between the upper mold 50 and the mobile mold 51 and the lower mold 60 (step (Ia)).
In the step (Ia), as shown in FIGS. 10A and 10B, the material steel plate B1 is not in contact with the punch mold 61 and the material steel plate B1 between the upper mold 50 and the two moving molds 51 and the lower mold 60. Place B1.
[0092]
Next, as shown in FIGS. 10C and 10D, the two mobile molds 51 are lowered to sandwich the two flange portion corresponding portions 310b between the stepped portion 51a and the movable plate 64 of the two mobile molds 51, and further. The deformed steel plate 310 is obtained by lowering the two moving molds 51 together with the two movable plates 64 and moving the two moving molds 51 toward the punch mold 61 (step (Ib)). At this time, the two flange portion corresponding portions are sandwiched between the step portion 51a of the two movable molds 51 and the movable plate 64.
Further, in the step (Ib), the upper surface portion of the punch mold 61 and the deformed steel plate 310 are maintained in a non-contact state.
[0093]
Next, as shown in FIGS. 10E and 10F, by further moving the two moving molds 51 toward the punch mold 61, the two vertical wall portion corresponding portions 310aw are moved to the two moving molds 51 and the punch mold 61. Restrained by the side surface (step (IIa)).
By this step, the vertical wall corresponding portion 310aw is constrained to a predetermined position. At this time, with the movement of the movable mold 51, the flange portion corresponding portion 310b moves from the movable plate 64 onto the punch mold 61. At this time, it is preferable to maintain a state in which the upper surface portion of the punch mold 61 and the deformed steel plate 310 are not in contact with each other.
[0094]
As shown in FIGS. 10E and 10F, the punch mold 61 includes a portion (step portion) having a shape corresponding to the flange portion 117. In the step (IIa), the portion and the movable plate 64 are flush with each other. In the step (IIa), the flange portion corresponding portion 310b shifts from the state of being arranged between the movable type 51 and the movable plate 64 to the state of being arranged between the movable type 51 and the punch type 61. The distance between the two sandwiching the flange portion corresponding portion 310b is preferably a length obtained by adding about 0.1 to 0.3 mm to the plate thickness of the flange portion corresponding portion 310b. With such a configuration, smooth movement in the horizontal direction is possible.
[0095]
Next, as shown in FIG. 10G, by lowering the upper die 50, the top plate corresponding portion 310 at is pressed by the upper die 50 and the punch die 61, and between the upper die 50 and the movable die 51. At least a part of the protrusion corresponding portion 310ae is overlapped (step (IIb)).
At the same time, as shown in FIG. 10H, by lowering the upper mold 50, the top plate corresponding portion 310at is pressed by the upper mold 50 and the punch mold 61, and the convex portion 50a and the concave mold portion 61a perform the ceiling. A recess 120 is formed between the upper mold 50 and the punch mold 61 by deforming the plate portion corresponding portion 310 at.
This forms the press-molded product 100.
[0096]
In the above step (IIa), the two mobile molds 51 are lowered, the two flange portion corresponding portions are sandwiched between the two mobile molds 51 and the movable plate 64, and the two mobile molds 51 are further killed. Lower to the point. After that, an example was shown in which the two vertical wall corresponding portions were restrained by the two moving molds 51 and the punch mold 61 by moving the two moving molds 51 in the horizontal direction (see FIG. 10E or FIG. 10F). .. On the other hand, the two mobile molds 51 are lowered to sandwich the two flange portion corresponding portions 310b between the two mobile molds 51 and the movable plate 64, and then the two mobile molds 51 are directed toward the punch mold 61. By moving the two vertical wall portions in an oblique direction, the two vertical wall portions may be constrained by the two moving molds 51 and the punch molds 61.
[0097]
Next, by moving the movable mold 51 in the horizontal direction and then raising the movable mold 51, the movable plate 64, and the upper mold 50, the press-molded product 100 can be carried out from the press device 40c. In this manufacturing method using the press device 40a, the mobile type 51 and the movable plate 64 can be raised at the same time. Therefore, it is possible to shorten the time required for manufacturing.
[0098]
In the above-mentioned example of the manufacturing method, the entire flange portion corresponding portion 310b (or flange portion 117) is arranged on the punch mold 61 in the step (IIa) and the step (IIb). However, a part of the flange portion corresponding portion 310b (or the flange portion 117) may be arranged on the movable plate 64 in the step (IIa) and the step (IIb). In this manufacturing method, after the press is completed, a part of the flange portion 117 is arranged on the movable plate 64, so that the press-molded product 100 rises as the movable plate 64 rises. Therefore, the upper mold 50, the mobile mold 51, and the movable plate 64 can be raised at the same time, and the time required for manufacturing can be further shortened.
[0099]
Hereinafter, an example of a manufacturing process for manufacturing the press-molded product 100A according to the modified example shown in FIG. 5 will be described using the press device 40b.
The cross section of the press device 40b corresponding to the protruding region P1 of the molded product 100A is as shown in FIG. 11A and the like. As shown in FIG. 11B and the like, the cross-sectional portion of the press device 40b corresponding to the non-protruding region P2 of the molded product 100A has a wider width of the punch mold 61 in the horizontal direction than the punch mold 61 of FIG. 11A and the like, and is a movable type. The step portion 51a of the 51 is deeply provided.
[0100]
First, as shown in FIGS. 11A and 11B, the material steel plate B1 is arranged between the upper mold 50 and the mobile mold 51 and the lower mold 60 (step (Ia)).
In the step (Ia), as shown in FIGS. 11A and 11B, the material steel plate B1 is not in contact with the punch mold 61 and the material steel plate B1 between the upper mold 50 and the two moving molds 51 and the lower mold 60. Place B1.
[0101]
Next, as shown in FIGS. 11C and 11D, the two mobile molds 51 are lowered to sandwich the two flange portion corresponding portions 310b between the stepped portion 51a and the movable plate 64 of the two mobile molds 51, and further. The deformed steel plate 310 is obtained by lowering the two moving molds 51 together with the two movable plates 64 and moving the two moving molds 51 toward the punch mold 61 (step (Ib)). At this time, the two flange portion corresponding portions are sandwiched between the step portion 51a of the two movable molds 51 and the movable plate 64.
Further, in the step (Ib), as shown in FIG. 11C, the upper surface portion of the punch mold 61 and the deformed steel plate 310 are maintained in a non-contact state.
[0102]
Next, as shown in FIGS. 11E and 11F, by further moving the two moving molds 51 toward the punch mold 61, the two vertical wall portion corresponding portions 310aw are moved to the two moving molds 51 and the punch mold 61. Restrained by the side surface (step (IIa)).
At this time, it is preferable to maintain a state in which the upper surface portion of the punch mold 61 and the deformed steel plate 310 do not contact at least in the region corresponding to the protruding region P1 of the molded product 100A in the deformed steel plate 310.
[0103]
Next, as shown in FIG. 11G, in the deformed steel plate 310, for the region corresponding to the protruding region P1 of the molded product 100A, by lowering the upper mold 50, the top plate portion corresponding portion 310at is made into the upper mold 50 and the punch mold. While pressing with 61, at least a part of the protrusion corresponding portion 310ae is overlapped between the upper mold 50 and the mobile mold 51 (step (IIb)). As a result, the press-molded product 100A is formed. As shown in FIG. 11H, the protruding portion 115 is not formed in the region corresponding to the non-protruding region P2 of the molded product 100A in the deformed steel plate 310.
[0104]
In the above step (IIa), the two mobile molds 51 are lowered, the two flange portion corresponding portions are sandwiched between the two mobile molds 51 and the movable plate 64, and the two mobile molds 51 are further killed. Lower to the point. After that, an example was shown in which the two vertical wall corresponding portions were restrained by the two moving molds 51 and the punch mold 61 by moving the two moving molds 51 in the horizontal direction (see FIGS. 11E or 11F). .. On the other hand, the two mobile molds 51 are lowered to sandwich the two flange portion corresponding portions 310b between the two mobile molds 51 and the movable plate 64, and then the two mobile molds 51 are directed toward the punch mold 61. By moving the two vertical wall portions in an oblique direction, the two vertical wall portions may be constrained by the two moving molds 51 and the punch mold 61.
[0105]
Next, after moving the movable mold 51 in the horizontal direction, the movable mold 51, the movable plate 64, and the upper mold 50 are raised so that the press-molded product 100A can be carried out from the press device 40c. In this manufacturing method using the press device 40b, the mobile type 51 and the movable plate 64 can be raised at the same time. Therefore, it is possible to shorten the time required for manufacturing.
Further, in the press device 40b shown in FIG. 11A or the like, a part of the flange portion 117 of the molded product 100A is arranged on the movable plate 64 at the end of the step (IIb), so that the movable plate 64 rises. The press-molded product 100A can be raised, and the upper die 50, the movable die 51, and the movable plate 64 can be raised at the same time, and the time required for manufacturing can be further shortened.
[0106]
Hereinafter, an example of a manufacturing process for manufacturing the press-molded product 100B shown in FIG. 6 using the press device 40c will be described.
The cross section of the press device 40c corresponding to the protruding region P1 of the molded product 100B is as shown in FIG. 12A and the like. As shown in FIG. 12B and the like, the cross-sectional portion of the press device 40c corresponding to the non-protruding region P2 of the molded product 100B has a higher height of the punch mold 61 than the punch mold 61 of FIG. 12A and the like.
[0107]
First, as shown in FIGS. 12A and 12B, the material steel plate B1 is arranged between the upper mold 50 and the movable mold 51 and the lower mold 60 (step (Ia)).
In the step (Ia), as shown in FIGS. 12A and 12B, the material steel plate B1 is not in contact with the punch mold 61 and the material steel plate B1 between the upper mold 50 and the two moving molds 51 and the lower mold 60. Place B1.
[0108]
Next, the two mobile molds 51 are lowered to sandwich the two flange portion corresponding portions 310b between the step portion 51a of the two mobile molds 51 and the movable plate 64, and further the two mobile molds 51 are placed on the two movable plates. The deformed steel plate 310 is obtained by lowering it together with 64 and moving the two moving molds 51 toward the punch mold 61 (step (Ib)). At this time, the two flange portion corresponding portions are sandwiched between the step portion 51a of the two movable molds 51 and the movable plate 64.
Further, in the step (Ib), the upper surface portion of the punch mold 61 and the deformed steel plate 310 are maintained in a non-contact state.
[0109]
Next, as shown in FIGS. 12C and 12D, by further moving the two moving molds 51 toward the punch mold 61, the two vertical wall corresponding portions 310aw are moved to the two moving molds 51 and the punch mold 61. Restrained by the side surface (step (IIa)).
By this step, the vertical wall corresponding portion 310aw is constrained to a predetermined position. At this time, with the movement of the movable mold 51, the flange portion corresponding portion 310b moves from the movable plate 64 onto the punch mold 61. At this time, it is preferable to maintain a state in which the upper surface portion of the punch mold 61 and the deformed steel plate 310 do not contact at least in the region corresponding to the protruding region P1 of the molded product 100B in the deformed steel plate 310.
[0110]
Next, as shown in FIG. 12E, by lowering the upper die 50, the top plate corresponding portion 310 at is pressed by the upper die 50 and the punch die 61, and between the upper die 50 and the movable die 51. At least a part of the protrusion corresponding portion 310ae is overlapped (step (IIb)). As shown in FIG. 12F, the protruding portion 115 is not formed in the region corresponding to the non-protruding region P2 of the molded product 100B in the deformed steel plate 310. As a result, the press-molded product 100B is formed.
[0111]
In the above step (IIa), the two mobile molds 51 are lowered, the two flange portion corresponding portions are sandwiched between the two mobile molds 51 and the movable plate 64, and the two mobile molds 51 are further killed. Lower to the point. After that, an example is shown in which the two vertical wall corresponding portions are restrained by the two moving molds 51 and the punch mold 61 by moving the two moving molds 51 in the horizontal direction. On the other hand, the two mobile molds 51 are lowered to sandwich the two flange portion corresponding portions 310b between the two mobile molds 51 and the movable plate 64, and then the two mobile molds 51 are directed toward the punch mold 61. By moving the two vertical wall portions in an oblique direction, the two vertical wall portions may be constrained by the two moving molds 51 and the punch mold 61.
[0112]
Next, after moving the movable mold 51 in the horizontal direction, the movable mold 51, the movable plate 64, and the upper mold 50 are raised so that the press-molded product 100 can be carried out from the press device 40c. In this manufacturing method using the press device 40a, the mobile type 51 and the movable plate 64 can be raised at the same time. Therefore, it is possible to shorten the time required for manufacturing.
In the above-mentioned example of the manufacturing method, the entire flange portion corresponding portion 310b (or flange portion 117) is arranged on the punch mold 61 in the step (IIa) and the step (IIb). However, a part of the flange portion corresponding portion 310b (or the flange portion 117) may be arranged on the movable plate 64 in the step (IIa) and the step (IIb). In this manufacturing method, after the press is completed, a part of the flange portion 117 is arranged on the movable plate 64, so that the press-molded product 100 rises as the movable plate 64 rises. Therefore, the upper mold 50, the mobile mold 51, and the movable plate 64 can be raised at the same time, and the time required for manufacturing can be further shortened.
[0113]
In the example of the present embodiment, an example in which the material steel plate B1 is heated to perform hot press molding has been described, but the manufacturing method of the present embodiment may be carried out by a cold press. When the manufacturing method of the present embodiment is performed by a cold press, it is not necessary to maintain a state in which the punch mold 61 and the material steel plate B1 do not come into contact with each other in the steps (Ia) and (Ib). Further, in the step (IIa), it is not necessary to maintain a state in which the upper surface portion of the punch mold 61 and the deformed steel plate 310 are not in contact with each other.
[0114]
Here, in the cross-sectional view of the press-molded products 100, 100A, and 100B in the protruding region P1, when the angle X formed by the top plate portion 111 and the protruding portion 115 is 90 ° or more and 135 ° or less, the step (IIb) is performed. After completion, the step (IIa) may be completed.
Further, when the angle X formed by the top plate portion 111 and the protruding portion 115 is 135 ° or more and 180 ° or less in the cross-sectional view in the protruding region P1 of the press-molded products 100, 100A, 100B, the step (IIa) is completed. After that, the step (IIb) may be completed.
[0115]
After manufacturing the press-molded products 100, 100A, 100B, the flange portion 117 may be cut if necessary.
[0116]
(Fourth Embodiment)
Hereinafter, a method for manufacturing a press-molded product according to a fourth embodiment of the present invention will be described. In the manufacturing method according to the present embodiment, a second example of the method for manufacturing the press-molded products 100, 100A, 100B described in the first embodiment will be described.
The method for manufacturing a press-molded product according to the third embodiment described above is a first step for obtaining a deformed steel plate as an intermediate product and a second step for obtaining a press-molded product 100 as a final product by one device. It was to be carried out together with the process. On the other hand, the method for manufacturing a press-molded product according to the fourth embodiment described below includes a first step for obtaining a deformed steel plate as an intermediate product and a second step for obtaining a press-molded product as a final product. Are carried out separately and with different molds.
Since the blank (material steel plate) overlaps with the description in the third embodiment described above, the description thereof will be omitted here. Further, the temperature conditions in the case of performing hot press molding in the second step also overlap with the description in the above-mentioned third embodiment, and therefore the description thereof will be omitted here.
[0117]
The first step is a step of obtaining a deformed steel plate by deforming the material steel plate. In the first step, a top plate corresponding portion that has a long shape and serves as a top plate portion 111, two vertical wall corresponding portions that form two vertical wall portions 113, and a protruding portion corresponding portion that serves as a protruding portion 115. And a deformed steel plate including two flange portions corresponding to the two flange portions 117 is obtained.
The region corresponding to the protruding region P1 of the molded product 100 is referred to as the first region, and the region corresponding to the non-protruding region P2 of the molded product 100 is referred to as the second region.
In the deformed steel plate, there is no clear boundary between the vertical wall corresponding part, the top plate corresponding part, the protruding part corresponding part and the flange part corresponding part. However, there may be some boundaries between them.
The deformed steel plate may be in a state of elastic deformation in which the deformation is eliminated when the load is removed.However, it may be in a state of plastic deformation in which the deformation is not eliminated even if the load is removed. That is, the deformed steel plate may be in a state of plastic deformation or a state of elastic deformation. A deformed steel plate in a state of plastic deformation may be referred to as a "preformed product" below.
[0118]
The transformation from the material steel plate (not shown) to the preformed product 301 in the first step of the present embodiment can be performed by bending, pressing, drawing, or a combination thereof. The deformation in the first step can be performed by cold working (for example, cold pressing) regardless of the tensile strength of the blank. In this case, it can be molded at a lower cost than hot stamping. However, if necessary, the first step may be performed by hot working (for example, hot pressing). In one example, the first step is cold working and the second step is hot stamping. When the second step is performed by cold working, it is an advantage that the hardness of the ridge line portion can be made higher than that of the flat surface portion by machining hardening.
[0119]
The second step is a step of forming the press-molded product 100 by press-molding the deformed steel plate. In the second step, the protruding portion 115 is formed by superimposing at least a part of the protruding portion corresponding portion.
The molding in the second step may be either hot press molding or cold press molding, but it is more preferable to use hot press molding. The press-molded product obtained in the second step may be further post-treated. The press-molded product obtained by the second step (or obtained by the subsequent post-treatment) may be used as it is or may be used in combination with other members.
[0120]
When performing hot stamping in the second step, first, the workpiece (preformed product) is heated to a predetermined quenching temperature. The quenching temperature is higher than the A3 transformation point (more specifically, the Ac3 transformation point) at which the workpiece is austenized, and may be, for example, 910 ° C. or higher. For heating the preformed product 301, for example, a method of heating the preformed product 301 in a heating device such as a heating furnace or a method of energizing the preformed product 301 to heat it can be used. The range of the heating temperature is preferably a range of the Ac3 transformation point or more (Ac3 transformation point + 150 ° C.) or less in order to obtain an austenite single layer and suppress the decomposition of the austenite layer. In order to dissolve the charcoal in the steel plate, the heating temperature holding time is preferably 1 second or more and 300 seconds or less. When elements such as Mn, Cr, and Mo having good hardenability are added, it can be retained in a short time.
[0121]
Next, the heated workpiece is pressed with a press device. Since the work piece is heated, it is unlikely to crack even if it is greatly deformed. The temperature of the work piece (preformed product) at the start of pressing is preferably Ms point or more (Ac3 transformation point + 150 ° C.) or less in order to obtain a martensite single layer within the above heating temperature range. Further, in order to secure productivity and suppress the disappearance of Zn in the case of GA steel plate, the temperature rising rate is preferably 5 ° C./sec or more and 500 ° C./sec or less.
When pressing the workpiece, quench the molded workpiece. By this quenching, the workpiece is hardened during the press processing. Quenching of the work piece can be carried out by providing a water cooling tube inside the mold or by ejecting water from the mold toward the work piece. The cooling rate when the workpiece is rapidly cooled by the press device is preferably 20 ° C./sec or more and 200 ° C./sec or less in order to suppress the manufacturing cost and obtain the martensite single layer. For example, 30 ° C./sec or higher is more preferable.
[0122]
The preformed product 301 (deformed steel plate) may include a U-shaped portion having a U-shaped cross section perpendicular to the longitudinal direction. This U-shaped portion includes two vertical wall portions, a top plate corresponding portion, and a protruding portion corresponding portion, and becomes two vertical wall portions, a top plate portion, and a protruding portion in a molded product. A portion to be a flange portion may be connected to the end portion of the U-shaped portion.
In the following description, the phrase "cross section" means, in principle, a cross section perpendicular to the longitudinal direction of a member such as a preformed product.
[0123]
When hot stamping is performed in the second step, a heating step of heating the preformed product 301 obtained by processing the material steel plate in the first step is included after the first step and before the second step. In the two steps, hot press molding is performed by a press mold including an upper mold and a lower mold and two cam molds. The lower mold has a convex portion, and has a step of arranging the lower mold in a state where the convex portion and at least a part of the deformed steel plate are not in contact with each other.
Further, in the second step, (a) the step corresponding to the top plate portion is pressed by the upper mold and the lower mold, and (b) the two vertical wall portions corresponding portions are pressed by the lower mold and the two cam molds. Including the process.
[0124]
In the manufacturing method described below, the second step may include the following steps (a) and (b). This second step is preferably used when the deformed steel plate is a preformed product that is plastically deformed.
[0125]
In step (a), the portion corresponding to the top plate is pressed by a press mold including a pair of upper and lower molds. In the step (b), the two vertical wall corresponding portions are pressed by the lower mold and the two cam molds. In the manufacturing method of the following embodiment, a mold may be used in which a protrusion is formed when both the step (a) and the step (b) are completed. The cam type mainly moves in the direction perpendicular to the pressing direction (horizontal direction). In a typical example, the cam type moves only horizontally.

The scope of the claims
[Claim 1]
The top plate extending in the longitudinal direction and
The vertical wall part extending downward from both edges in the width direction of the top plate part,
A portion of the top plate portion extending outward from both ends in the width direction and a portion extending outward from the upper end of the vertical wall portion overlap with each other to form a part of the top plate portion in the longitudinal direction. With the formed protrusion,
A long molded product made of a single steel plate, including
When the region in which the protruding portion is provided is defined as a protruding region and the region in which the protruding portion is not provided is defined as a non-protruding region in the longitudinal direction of the molded product,
In the non-protruding region, a recess extending in the longitudinal direction is formed in the top plate portion.
The total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product in the protruding region and the longitudinal direction of the molded product in the non-projecting region. A molded product in which the total value β of the inner surface peripheral lengths of the top plate portion, the vertical wall portion, and the recess in the cross section perpendicular to the above satisfies 1.01 ≦ β / α ≦ 1.50.
[Claim 2]
The top plate extending in the longitudinal direction and
The vertical wall part extending downward from both edges in the width direction of the top plate part,
A portion of the top plate portion extending outward from both ends in the width direction and a portion extending outward from the upper end of the vertical wall portion overlap with each other to form a part of the top plate portion in the longitudinal direction. With the formed protrusion,
A long molded product made of a single steel plate, including
When the region in which the protruding portion is provided is defined as a protruding region and the region in which the protruding portion is not provided is defined as a non-protruding region in the longitudinal direction of the molded product,
In the non-protruding region, the top plate portion has an enlarged top plate portion extending from the top plate portion in the width direction and continuing to the vertical wall portion.
The total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product in the protruding region and the longitudinal direction of the molded product in the non-projecting region. A molded product in which the total value β of the inner surface peripheral lengths of the top plate portion including the enlarged top plate portion and the vertical wall portion in a cross section perpendicular to the vertical wall portion satisfies 1.01 ≦ β / α ≦ 1.50.
[Claim 3]
The top plate extending in the longitudinal direction and
The vertical wall part extending downward from both edges in the width direction of the top plate part,
A portion of the top plate portion extending outward from both ends in the width direction and a portion extending outward from the upper end of the vertical wall portion overlap each other to form a part of the top plate portion in the longitudinal direction. With the protruding part
A long molded product made of a single steel plate, including
When the region in which the protruding portion is provided is defined as a protruding region and the region in which the protruding portion is not provided is defined as a non-protruding region in the longitudinal direction of the molded product,
In the non-protruding region, the vertical wall portion has an enlarged vertical wall portion extending upward from the vertical wall portion and connected to the top plate portion.
The total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product in the protruding region and the longitudinal direction of the molded product in the non-projecting region. A molded product in which the total value β of the inner surface peripheral lengths of the top plate portion and the vertical wall portion including the enlarged vertical wall portion in a cross section perpendicular to is 1.01 ≦ β / α ≦ 1.50.
[Claim 4]
Further provided with a flange portion extending from the lower end of the vertical wall portion toward the outside.
The molded product according to any one of claims 1 to 3.
[Claim 5]
The length of the protruding region in the longitudinal direction is 30% or more of the total length of the molded product in the longitudinal direction.
The molded product according to any one of claims 1 to 4.
[Claim 6]
In the protruding portion, the portion extending from the top plate portion and the portion extending from the vertical wall portion are in close contact with each other.
The molded product according to any one of claims 1 to 5.
[Claim 7]
In the protruding portion, the portion extending from the top plate portion and the portion extending from the vertical wall portion are joined to each other.
The molded product according to any one of claims 1 to 6.
[Claim 8]
The angle between the top plate and the protruding portion in the protruding region in the cross section perpendicular to the longitudinal direction of the molded product is 90 ° or more and 180 ° or less.
The molded product according to any one of claims 1 to 7.
[Claim 9]
The molded product according to any one of claims 1 to 8 and
Including the steel plate member fixed to the molded product
The molded product and the steel plate member form a closed cross section in a cross-sectional view perpendicular to the longitudinal direction.
Structural member.
[Claim 10]
Further includes an auxiliary member joined to each of the two vertical wall portions and at least one of the top plate portions, or at least one of the two vertical wall portions and the top plate portion. ,
The structural member according to claim 9.
[Claim 11]
A top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, a flange portion extending from the lower end of the vertical wall portion, and outside from both ends of the top plate portion in the width direction. 1 includes a portion extending toward the top plate portion and a protruding portion formed in a part of the top plate portion in the longitudinal direction by overlapping the portions extending from the upper end of the vertical wall portion toward the outside. A long molded product formed of a single steel plate, in the longitudinal direction of the molded product, a region in which the protruding portion is provided is defined as a protruding region, and a region in which the protruding portion is not provided is defined as a protruding region. When defined as a non-protruding region, in the non-protruding region, a recess extending in the longitudinal direction is formed in the top plate portion, and the protrusion is formed in the cross section perpendicular to the longitudinal direction of the molded product. The total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion, and the top plate portion, the vertical wall portion, and the concave portion in the cross section perpendicular to the longitudinal direction of the molded product in the non-protruding region. The total value β of the inner surface peripheral length of the above is a method for manufacturing a molded product satisfying 1.01 ≦ β / α ≦ 1.50.
It is performed using a press device including an upper mold and a lower mold having a shape corresponding to the concave portion in the non-protruding region, and two mobile molds that can be moved in the vertical and horizontal directions.
The lower mold includes a punch mold and two movable plates arranged so as to sandwich the punch mold and movable in the vertical direction.
(Ia) The process of arranging the material steel plate between the upper mold and the two mobile molds and the lower mold,
(Ib) Between the two mobile molds and the two movable plates by lowering the two mobile molds together with the two movable plates and moving the two mobile molds toward the punch mold. In the process of obtaining a deformed steel plate with the end of the material steel plate sandwiched between
(IIa) A step of restraining a part of the deformed steel plate by the two moving molds and the side surface portion of the punch mold by further moving the two moving molds toward the punch mold.
(IIb) By lowering the upper mold, a part of the deformed steel plate is pressed by the upper mold and the punch mold, and a part of the deformed steel plate is pressed between the upper mold and the moving mold. A step of superimposing, thereby forming the molded product having the top plate portion in which the recess is formed, and the step of forming the molded product.
including,
Manufacturing method of molded products.
[Claim 12]
A top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, a flange portion extending from the lower end of the vertical wall portion, and outside from both ends of the top plate portion in the width direction. 1 includes a portion extending toward the top plate portion and a protruding portion formed in a part of the top plate portion in the longitudinal direction by overlapping the portions extending from the upper end of the vertical wall portion toward the outside. A long molded product formed of a single steel plate, in the longitudinal direction of the molded product, a region in which the protruding portion is provided is defined as a protruding region, and a region in which the protruding portion is not provided is defined as a protruding region. When defined as a non-protruding region, in the non-protruding region, the top plate portion has an enlarged top plate portion extending from the top plate portion in the width direction and continuing to the vertical wall portion, and the top plate portion in the protruding region. In the cross section perpendicular to the longitudinal direction of the molded product in the non-protruding region, the total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product. A method for manufacturing a molded product in which the total value β of the inner surface peripheral lengths of the top plate portion including the enlarged top plate portion and the vertical wall portion satisfies 1.01 ≦ β / α ≦ 1.50.
It is performed using a press device including an upper mold and a lower mold having a shape corresponding to the enlarged top plate portion in the non-protruding region, and two mobile molds that can be moved in the vertical and horizontal directions.
The lower mold includes a punch mold and two movable plates arranged so as to sandwich the punch mold and movable in the vertical direction.
(Ia) The process of arranging the material steel plate between the upper mold and the two mobile molds and the lower mold,
(Ib) Between the two mobile molds and the two movable plates by lowering the two mobile molds together with the two movable plates and moving the two mobile molds toward the punch mold. In the process of obtaining a deformed steel plate with the end of the material steel plate sandwiched between
(IIa) A step of restraining a part of the deformed steel plate by the two moving molds and the side surface portion of the punch mold by further moving the two moving molds toward the punch mold.
(IIb) By lowering the upper mold, a part of the deformed steel plate is pressed by the upper mold and the punch mold, and a part of the deformed steel plate is pressed between the upper mold and the moving mold. A step of superimposing and thereby forming the molded product having the top plate portion including the enlarged top plate portion.
including,
Manufacturing method of molded products.
[Claim 13]
A top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, a flange portion extending from the lower end of the vertical wall portion, and outside from both ends of the top plate portion in the width direction. One piece including a portion extending toward the surface and a protruding portion formed in a part of the top plate portion in the longitudinal direction by overlapping the portions from the upper end of the vertical wall portion toward the outside. In the longitudinal direction of the molded product, the region where the protrusion is provided is defined as a protrusion region, and the region where the protrusion is not provided is defined as a non-projection region. When defined as a protruding region, in the non-protruding region, the vertical wall portion has an enlarged vertical wall portion extending upward from the vertical wall portion and connected to the top plate portion, and the molded product in the protruding region. The total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction, and the top plate in the non-protruding region in the cross section perpendicular to the longitudinal direction of the molded product. A method for manufacturing a molded product in which the total value β of the inner surface peripheral lengths of the portion and the vertical wall portion including the enlarged vertical wall portion satisfies 1.01 ≦ β / α ≦ 1.50.
For a press device including an upper mold and a lower mold having a shape corresponding to the enlarged vertical wall portion in the non-protruding region, and two mobile molds that can be moved in the vertical and horizontal directions.It was done
The lower mold includes a punch mold and two movable plates arranged so as to sandwich the punch mold and movable in the vertical direction.
(Ia) The process of arranging the material steel plate between the upper mold and the two mobile molds and the lower mold,
(Ib) Between the two mobile molds and the two movable plates by lowering the two mobile molds together with the two movable plates and moving the two mobile molds toward the punch mold. In the process of obtaining a deformed steel plate with the end of the material steel plate sandwiched between
(IIa) A step of restraining a part of the deformed steel plate by the two moving molds and the side surface portion of the punch mold by further moving the two moving molds toward the punch mold.
(IIb) By lowering the upper mold, a part of the deformed steel plate is pressed by the upper mold and the punch mold, and a part of the deformed steel plate is pressed between the upper mold and the moving mold. A step of superimposing and thereby forming the molded product having the vertical wall portion including the enlarged vertical wall portion.
including,
Manufacturing method of molded products.
[Claim 14]
The deformed steel plate obtained in the step (Ib) has a long shape and has a long shape.
The part corresponding to the top plate, which is the top plate,
The vertical wall equivalent part, which is the vertical wall part,
The part corresponding to the protruding part, which is the protruding part, and
The part corresponding to the flange part that becomes the flange part,
Including
In the step (Ib), the flange portion corresponding portion is sandwiched between the two mobile molds and the two movable plates.
In the step (IIa), the vertical wall corresponding portion is restrained by the two moving types and the side surface portions of the punch type.
In the step (IIb), by lowering the upper mold, the upper plate corresponding portion is pressed by the upper mold and the punch mold, and the protrusion between the upper mold and the moving mold. Overlay at least part of the corresponding part,
The method for manufacturing a molded product according to any one of claims 11 to 13.
[Claim 15]
Further includes a step of cutting the flange portion after the step of molding the molded product.
The method for manufacturing a molded product according to any one of claims 11 to 14.
[Claim 16]
In the cross-sectional view of the molded product, the angle formed by the top plate portion and the protruding portion is 90 ° or more and 135 ° or less.
After the step (IIb) is completed, the step (IIa) is completed.
The method for manufacturing a molded product according to any one of claims 11 to 15.
[Claim 17]
In the cross-sectional view of the molded product, the angle formed by the top plate portion and the protruding portion is 135 ° or more and 180 ° or less.
After the step (IIa) is completed, the step (IIb) is completed.
The method for manufacturing a molded product according to any one of claims 11 to 15.
[Claim 18]
The step of heating the material steel plate is further included before the step of (Ia).
In the step (Ia) and the step (Ib), the punch mold and the material steel plate are kept in contact with each other, and in the step (IIa), the upper surface portion of the punch mold and the deformed steel plate are in contact with each other. Keep in a state of not
The method for manufacturing a molded product according to any one of claims 11 to 17.
[Claim 19]
A top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, a flange portion extending from the lower end of the vertical wall portion, and outside from both ends of the top plate portion in the width direction. 1 includes a portion extending toward the top plate portion and a protruding portion formed in a part of the top plate portion in the longitudinal direction by overlapping the portions extending toward the outside and the portion extending from the upper end of the vertical wall portion toward the outside. A long molded product formed of a single steel plate, in the longitudinal direction of the molded product, a region where the protrusion is provided is defined as a protrusion region, and a region where the protrusion is not provided is defined as a protrusion region. When defined as a non-protruding region, in the non-protruding region, a recess extending in the longitudinal direction is formed in the top plate portion, and the protrusion is formed in the cross section perpendicular to the longitudinal direction of the molded product. The total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion, and the top plate portion, the vertical wall portion, and the concave portion in the cross section perpendicular to the longitudinal direction of the molded product in the non-protruding region. The total value β of the inner surface peripheral length of the above is a method for manufacturing a molded product satisfying 1.01 ≦ β / α ≦ 1.50.
By deforming the material steel plate
Has a long shape and has a long shape
The part corresponding to the top plate, which is the top plate,
The vertical wall equivalent part, which is the vertical wall part,
The part corresponding to the protruding part, which is the protruding part, and
The part corresponding to the flange part that becomes the flange part,
The first step to obtain a deformed steel plate containing
Includes a second step of molding the deformed steel plate to form the molded product.
In the second step, the projecting portion having the top plate portion on which the recess is formed is formed by superimposing at least a part of the projecting portion corresponding portion.
Manufacturing method of molded products.
[Claim 20]
A top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, a flange portion extending from the lower end of the vertical wall portion, and outside from both ends of the top plate portion in the width direction. 1 includes a portion extending toward the top plate portion and a protruding portion formed in a part of the top plate portion in the longitudinal direction by overlapping the portions extending toward the outside and the portion extending from the upper end of the vertical wall portion toward the outside. A long molded product formed of a single steel plate, in the longitudinal direction of the molded product, a region where the protrusion is provided is defined as a protrusion region, and a region where the protrusion is not provided is defined as a protrusion region. When defined as a non-protruding region, in the non-protruding region, the top plate portion has an enlarged top plate portion extending from the top plate portion in the width direction and continuing to the vertical wall portion, and the top plate portion in the protruding region. In the cross section perpendicular to the longitudinal direction of the molded product in the non-protruding region, the total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction of the molded product. A method for manufacturing a molded product in which the total value β of the inner surface peripheral lengths of the top plate portion including the enlarged top plate portion and the vertical wall portion satisfies 1.01 ≦ β / α ≦ 1.50.
By deforming the material steel plate
Has a long shape and has a long shape
The part corresponding to the top plate, which is the top plate,
The vertical wall equivalent part, which is the vertical wall part,
The part corresponding to the protruding part, which is the protruding part, and
The part corresponding to the flange part that becomes the flange part,
The first step to obtain a deformed steel plate containing
Includes a second step of molding the deformed steel plate to form the molded product.
In the second step, the protruding portion having the top plate portion including the enlarged top plate portion is formed by superimposing at least a part of the protruding portion corresponding portion.
Manufacturing method of molded products.
[Claim 21]
A top plate portion extending in the longitudinal direction, a vertical wall portion extending downward from both widthwise edges of the top plate portion, a flange portion extending from the lower end of the vertical wall portion, and outside from both ends of the top plate portion in the width direction. One piece including a portion extending toward the surface and a protruding portion formed in a part of the top plate portion in the longitudinal direction by overlapping the portions from the upper end of the vertical wall portion toward the outside. In the longitudinal direction of the molded product, the region where the protrusion is provided is defined as a protrusion region, and the region where the protrusion is not provided is defined as a non-projection region. When defined as a protruding region, in the non-protruding region, the vertical wall portion has an enlarged vertical wall portion extending upward from the vertical wall portion and connected to the top plate portion, and the molded product in the protruding region. The total value α of the inner surface peripheral lengths of the top plate portion and the vertical wall portion in the cross section perpendicular to the longitudinal direction, and the top plate in the non-protruding region in the cross section perpendicular to the longitudinal direction of the molded product. A method for manufacturing a molded product in which the total value β of the inner surface peripheral lengths of the portion and the vertical wall portion including the enlarged vertical wall portion satisfies 1.01 ≦ β / α ≦ 1.50.
By deforming the material steel plate
Has a long shape and has a long shape
The part corresponding to the top plate, which is the top plate,
The vertical wall equivalent part, which is the vertical wall part,
The part corresponding to the protruding part, which is the protruding part, and
The part corresponding to the flange part that becomes the flange part,
The first step to obtain a deformed steel plate containing
Includes a second step of molding the deformed steel plate to form the molded product.
In the second step, the projecting portion having the vertical wall portion including the enlarged vertical wall portion is formed by superimposing at least a part of the projecting portion corresponding portion.
Manufacturing method of molded products.
[Claim 22]
The step of cutting the flange portion is further included after the second step.
The method for manufacturing a molded product according to any one of claims 19 to 21.
[Claim 23]
A heating step of heating the deformed steel plate is further included after the first step and before the second step.
In the second step, hot press molding is performed by a press mold including an upper mold and a lower mold having a convex portion, and two cam molds.
After the heating step, the deformed steel plate is placed so that the convex portion of the lower mold and the deformed steel plate do not come into contact with each other.
The method for manufacturing a molded product according to any one of claims 19 to 22.