Technical field
[0001]
The present invention, moldings diaphragm automotive structural members, a method of manufacturing a motor vehicle structural member for drawing body, and a manufacturing apparatus for an automobile structural member for drawing body.
This application is June 16, 2016, claiming priority on Japanese Patent Application No. 2016-120157 filed in Japan, the contents of which are incorporated herein.
BACKGROUND
[0002]
　As an automotive structural member, for example the side sill, bumper reinforcement, A-pillar lower panel, A-pillar, such B-pillar, elongated member is widely used with a hat-shaped cross section. As a material for these automobile structural members, in terms of weight and collision safety improvement of automobiles, for example, a plate thickness is 1.4mm or less, the tensile strength is used is thin high-strength steel sheet is not less than 980MPa there.
　On the other hand, the bending rigidity and torsional rigidity of the vehicle body (body shell) by thinning of automotive structural members (hereinafter collectively referred to as "rigid") decrease in is a problem. Therefore, improvement in the rigidity of the automobile structural member obtained by pressing a thin high-strength steel sheets is strongly required.
[0003]
　Since formability of high-strength steel sheet is low, automobile structural members made of thin high strength steel sheet is shaped by pressing by generally bent. However, when forming a motor vehicle structural member elongated described above by pressing by bending, easily wrinkle is generated in the flange-forming portions shrinkage during bending.
[0004]
　Therefore, these automobile construction member can not be a structure having an end wall at an end portion in the longitudinal direction (the structure the shape of the cross section perpendicular to the pressing direction is U-shaped or rectangular). Therefore, inevitably a top plate portion, and a sidewall adjacent to both sides of the top plate portion, by a flange adjacent to the side wall structure of the opening cross section of the formed hat.
[0005]
　The rigidity of the automobile structural member having an open cross-sectional shape of the hat-type, U-shaped cross section, or, lower than the stiffness of an automobile structural member having a rectangular cross-section. If, U-shaped cross section, or, even if it is possible to mold the automobile structural member having a rectangular cross-section, in particular so shallow molded depth in order to avoid the occurrence of wrinkles in the end wall and the side wall forced to without obtaining, not obtain automobile structural member having a high rigidity.
[0006]
　Thus, tensile when strength is to be produced automobile structural member described above such as thin high-strength steel sheet of more than 980MPa as a material, thickness is thin, and, due to the two points that the molded depth is shallow , it can not produce an automobile structural member having a high rigidity.
[0007]
　Patent Document 1, using a machining tool having a punch and die and blank holder, in performing press working for forming the metal plate in section a hat shape, the both widthwise end portions of the metal plate by the die and the blank holder sandwiched therebetween in a state where the nipped, using a punch having a convex portion of a semicircular cross-section which is convex toward the metal plate at the beginning on the head, the punch on the metal plate portion to be the wall of the sectional hat shape predetermined sectional preliminary machining portion to be a hat head portion of the metal plate is formed into a convex shape which is convex toward the outside applied to the metal plate, then the metal plate after pre-processing with contacting the protrusion of the using punch to obtain a hat shape, there is disclosed press-forming method excellent in shape fixability characterized by applying finishing.
[0008]
　Patent Document 2, a method of manufacturing a tubular member polygonal metal flat plate by press working, and the flat portion, a corner portion made of a curved surface and the deformation portion in the boundary region between the corner portion and the flat portion a step of forming by drawing a side peripheral portion consisting of the steps of forming the side peripheral portion to a predetermined height from the flat metal surface, over the height of the side peripheral portion, said annular member together from inside pushes the corner portion, by supplementing the metallic material forming the flexible portion to the edge portion, the inner peripheral surface of the annular member, from the corner portion, smaller curvature than the radius of curvature of the corner portion method for manufacturing a polygonal annular member including a step, the shaping the edge portion having a radius is disclosed.
CITATION
Patent Document
[0009]
Patent Document 1: Japanese Patent 2004-181502 JP
Patent Document 2: Japanese Patent 2011-245502 JP
Summary of the Invention
Problems that the Invention is to Solve
[0010]
　In the invention disclosed in Patent Document 1, since crushing in finishing the top plate portion of the molded article by the preliminary processing, although it is possible to reduce the curvature radius of the bent portion of the cross-section view, a corner radius in plan view can not be reduced.
[0011]
　In the invention disclosed in Patent Document 2, in order to use the tool for pressing in the step of forming the edge portion from the inside of the corner portion, becomes complicated its modification contents together it is necessary to perform the equipment modification of the mold or the like, equipment costs increase.
[0012]
　The present invention has been made in view of the above circumstances, while lighter, moldings diaphragm automotive structural members capable of increasing the resistance to collision characteristics with high rigidity, an automobile structural member for drawing body manufacturing methods, and an object of the invention to provide a manufacturing apparatus for an automobile structural member for drawing body.
Means for Solving the Problems
[0013]
　The present invention is as listed below.
[0014]
(1) First aspect of the present invention has a tensile strength of a molded body diaphragm or automotive structural members 980 MPa, a top plate portion extending in the first direction, of the top plate portion, the first direction orthogonal and two the first projecting ridge portion adjacent to each side of the second direction along the top plate, said two first convex ridge with adjacent endmost portion of the first direction of the top plate a second convex ridge portion continuous with parts, the two two side walls adjacent to the first convex ridge portion, and an end wall adjacent to the second convex ridge portions, the two side walls, and, the end wall with adjacent, and two corner walls having a curved shape when viewed from the direction perpendicular to said first direction and said second direction, said two side walls, concave adjacent to the end wall and the two corner walls It comprises a ridge portion, an outward flange adjacent to the凹稜line unit.
　It said two first convex ridge portion, the second convex ridge portion and the凹稜line section, the radius of curvature of the cross-section perpendicular to the respective extending direction Both are at 30mm or less, the said outward flange凹稜line from the boundary between the parts, in 1.0mm spaced locations along said angle wall, the first direction and the corner radius is the curvature radius of the corner wall as viewed from a direction perpendicular to the second direction be a 30mm or less , in a direction perpendicular to the top plate portion, a distance is molded depth of the outward flange and the top plate portion is 40mm or more.
[0015]
(2) the motor vehicle structural member for drawing body according to (1), at opposite ends of said first direction, said end wall, said two corner walls, the 凹稜 line section and the outward flange is formed it may be.
[0016]
(3) above (1) or automotive structural members throttle molded product according to (2), side sill, bumper beam, A pillar lower panel, may be A-pillar or B-pillar.
[0017]
(4) Second aspect of the present invention, the above (1) to be any method for producing a motor vehicle structural member for drawing body according to one of (3), the above tensile strength 980MPa blank, first die, by performing press working by drawing using a first punch and a first blank holder, an intermediate top plate portion extending in the first direction, perpendicular to the first direction of the intermediate top panel section and two intermediate first convex ridge portion adjacent to each side of the second direction, the mid-continuous with the two intermediate first convex ridge portion with adjacent endmost portion of the first direction of the intermediate top panel section a secondary convex ridge portion, and two intermediate side walls continuous with the two intermediate first convex ridge portion, and an intermediate end wall adjacent to said intermediate second convex ridge portions, the two intermediate side walls, and, the intermediate end with adjacent walls, straight in the first direction and the second direction And two intermediate angles wall having a curved shape as viewed from a direction, an intermediate 凹稜 line section adjacent to the two intermediate side walls, said intermediate end wall and the two intermediate angles walls, adjacent to the intermediate 凹稜 line section an intermediate outwardly flange, the two intermediate first convex ridge portions, the intermediate second convex ridge portion and the intermediate 凹稜 line section, the radius of curvature of the cross-section perpendicular to the respective extending direction are both the two first convex ridge portion of the draw-forming body, larger than the radius of curvature of the cross-section perpendicular to the respective extending direction of the second convex ridge portion and the 凹稜 line portion, the said intermediate outward flange from the boundary between the intermediate 凹稜 wire portion, an intermediate corner said in along an intermediate angle wall 1.0mm spaced locations, the radius of curvature of the first direction and the intermediate angle wall viewed from the direction orthogonal to the second direction radius, the throttle Larger than the corner radius of the corner wall of features, said in a direction perpendicular to the intermediate top panel section, the intermediate top panel section and the intermediate outward flange and the intermediate molded depth stop the compact is a distance a first step of molding the molded depth first intermediate aperture formed body is greater than the said the first intermediate aperture formed body, the second die, the press working by drawing using a second punch and a second blank holder was carried out, the two intermediate first convex ridge portions, the intermediate of the second convex ridge portion and the intermediate 凹稜 line portion, reducing the curvature radius and the intermediate molded depth of the cross-section perpendicular to the respective extending direction the second with the two first projecting ridge portion, the second convex ridge portion and the 凹稜 line portion, the radius of curvature and the forming height of the cross-section perpendicular to the respective extending direction of the draw-forming member intermediate drawing A second step of forming the body, the second intermediate aperture formed body, said second die, while constrained by the second punch and the second blank holder, the inner pad built in the second punch said intermediate corner radius of the first intermediate aperture formed body of said intermediate end wall of the inner surface of the pressing above by tightening tool while the second intermediate throttle intermediate end wall of the shaped body is pressed to the first direction said intermediate angle wall third step and method for producing a motor vehicle structural member for drawing body comprises reducing the.
[0018]
(5) In the above (4) The method of producing an automobile structural member for drawing body according to the intermediate molded depth is 1.1 to 2.0 times of the molded depth, the two intermediate first Ichitotsu ridge portion, the intermediate second convex ridge portion and the intermediate 凹稜 line portions each radius of curvature, both said two first convex ridge portion, the second convex ridge portion and the 凹稜 line portions each curvature 1.2 to 30 times the radius, the intermediate corner radius may be 1.2 to 30 times of the corner radius.
[0019]
(6) In the above (4) or (5) The method of producing an automobile structural member for drawing body according to the tightening tool, be arranged movably said to second die outside said first direction good.
[0020]
(7) In the manufacturing method of the above (4) or (5) to stop for automotive structural members according molded body, the tightening tool, moves are freely arranged from the outside of the second die to the first direction to the inside it may be.
[0021]
(8) The third aspect of the present invention, the above (1) to an apparatus for producing a motor vehicle structural member for squeezing molding according to any one of (3), the first die, the first punch, and a first molding die having a first blank holder, the second die comprising a second molding die having a second punch, and the second blank holder, and tightening tool, wherein the first molding die, by tensile strength to perform press working by drawing in more blanks 980 MPa, and an intermediate top plate portion extending in the first direction, adjacent to both sides of the second direction perpendicular to the first direction of the intermediate top panel section and two intermediate first convex ridge portion of the intermediate second convex ridge portion continuing to said two intermediate first convex ridge portion with adjacent endmost portion of the first direction of the intermediate top panel section, the and two intermediate side walls continuous to the two intermediate first convex ridge portions, the intermediate Having an intermediate end wall adjacent to the two convex ridge portions, the two intermediate side walls, and, together with the adjacent to the intermediate end wall, a curved shape when viewed from the direction perpendicular to said first direction and said second direction provided with two intermediate angles walls, the two intermediate side walls, and an intermediate 凹稜 line section adjacent to the intermediate end wall and the two intermediate angles walls, and an intermediate outwardly flange adjacent to said intermediate 凹稜 line section, the two intermediate first convex ridge portions, the intermediate second convex ridge portion and the intermediate 凹稜 line section, the radius of curvature of the cross-section perpendicular to the respective extending direction are both, the two first of the draw-forming member Ichitotsu ridge portion, the boundary between the second convex ridge portion and the 凹稜 line portion larger than the radius of curvature of the cross-section perpendicular to the respective extending direction of the intermediate outward flange and the intermediate 凹稜 line section, the 1.0mm away along the intermediate angle wall In position, the first direction and intermediate the corner radius is the radius of curvature of the intermediate angle wall viewed from the direction orthogonal to the second direction is larger than the corner radius of the corner wall of the drawing member, wherein in a direction perpendicular to the intermediate top panel section, the intermediate top panel section and the intermediate outward flange and the intermediate molded depth stop the compact the molding depth first intermediate aperture formed body is larger than which is the distance shaped, the second molding die performs press molding by draw forming on the first intermediate aperture formed body, said two intermediate first convex ridge portions, the intermediate second convex ridge portion and the intermediate 凹稜 line section of, by reducing the radius of curvature and said intermediate molded depth of the cross-section perpendicular to the respective extending direction, said two first projections ridgeline portion of the draw-forming member, said second projecting ridge portion and the 凹稜 line parts, it Molding the second intermediate aperture formed body having a radius of curvature and the forming height of the cross-section perpendicular to the extending direction of, respectively, the tightening tool, said second intermediate aperture formed body, the second molding die while restrained by, said second punch into the intermediate end wall of the second intermediate aperture formed body while pressing the inner surface of said intermediate end wall of said first intermediate aperture formed body by the built-in inner pad first it is pressed in the direction to decrease the intermediate corner radius of the intermediate angle wall, a manufacturing apparatus for an automobile structural member for drawing body.
[0022]
(9) In the manufacturing apparatus of an automobile structural member for drawing body described in (8), said intermediate molded depth is 1.1 to 2.0 times of the molded depth, the two intermediate the first convex ridge portions, the intermediate second convex ridge portion and the intermediate 凹稜 line portions each radius of curvature, said two first projections ridge portion, of each of the second projecting ridge portion and the 凹稜 line portion the radius of curvature of with 1.2 to 30 times, the intermediate corner radius may be 1.2 to 30 times of the corner radius.
[0023]
(10) In the manufacturing apparatus of an automobile structural member for drawing body described in (8) or (9), the tightening tool, moves by being freely disposed the the second die outside said first direction it may be.
[0024]
(11) In the above (8) or manufacturing apparatus of an automobile structural member for drawing body described in (9), the tightening tool, movably disposed externally of the second die to the first direction to the inside it may be.
Effect of the invention
[0025]
　According to each of the above aspects, a tensile strength of not less than 980 MPa, the molded depth is deep, small corner radii of curvature and Sumikabe ridge portion, because it has an end wall at an end portion in the longitudinal direction, while lighter, it is possible to provide a motor vehicle structural member for drawing body capable of enhancing the resistance to collision characteristics with high rigidity.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026]
[1] is an explanatory view schematically showing a portion of an automobile structural member for drawing body according to an embodiment of the present invention.
Is an explanatory view schematically showing a motor vehicle structural member for drawing body case having an end wall in FIG. 2 both ends.
When using a motor vehicle structural member for drawing body according to FIG. 3A] The present embodiment as side sills, is an explanatory view showing a state before joining the side sill to the A-pillar lower panel.
Is an explanatory view showing a first example of FIG. 3B] manner of joining the side sill to the A-pillar lower panel.
Is an explanatory view showing a second example of FIG. 3C] manner of joining the side sill and the A-pillar lower panel.
[4] The first die is an explanatory view showing a first intermediate stop the moldings formed by the first punch and the first blank holder.
It is an explanatory view showing a first step from FIG 5A] first intermediate aperture formed body until the production of the second intermediate drawing body through and stop moldings.
[FIG. 5B] is an explanatory diagram showing a second stage from the first intermediate aperture formed body until the production of draw-forming member via the second intermediate stop moldings.
[FIG. 5C] is an explanatory view showing a third step of the first intermediate-drawn body to the production of drawing body via the second intermediate stop moldings.
6 is a top cross-sectional view showing over time the molding conditions when the cam is positioned outside of the second die.
7 is a side sectional view showing over time the molding conditions when the cam is positioned outside of the second die.
8 is an explanatory diagram over time showing the molding conditions when the cam is placed into the second die.
[FIG 9A] is an explanatory view showing a test object A used in Example.
[FIG. 9B] is an explanatory view showing a test object B used in Examples.
[FIG 9C] is an explanatory view showing a test object C employed in Example.
It is an explanatory view showing a test object D as used in FIG. 9D] Example.
[FIG 9E] is an explanatory view showing a test object E used in Examples.
[FIG 9F] is an explanatory view showing a test object F used in Examples.
Is an explanatory view showing a test object G used in FIG. 9G] Example.
FIG. 10 is an explanatory diagram showing the measurement conditions of the torsional rigidity relative to the test object A.
11 is a graph showing the evaluation results of the torsional rigidity relative to the test object A ~ G.
FIG. 12 is an explanatory diagram showing the measurement conditions of the bending rigidity with respect to the specimen A.
13 is a graph showing the evaluation results of the flexural stiffness against the test object A ~ G.
DESCRIPTION OF THE INVENTION
[0027]
　The present inventor has conducted extensive studies to solve the above problems, to produce a draw-formed body having tensile strength of at least 980 MPa, the radius of curvature of the ridge line portion of the target, the corner radius and molded depth of Sumikabe the process of following (a) ~ (c) was found that adopting is effective, and have completed the present invention by overlapping a further study in order.
Using a first molding die (a), the first intermediate aperture formed body by molding greater than the target value the corner radius of curvature and the wall of the ridge portion.
(B) using a second molding die, the first intermediate aperture formed body is shaped into a second intermediate drawing of the cross-sectional shape having a radius of curvature and forming height of the ridge portion of the target.
Using tightening tool such as a (c) a cam, the longitudinal end portion of the second intermediate-drawn body is pressed in the axial direction of the second intermediate aperture formed body, forming small corner radii of Sumikabe.
　Will be described below with reference to the accompanying drawings, embodiments of the present invention made based on the above findings.
[0028]
(1. automobile structural member for drawing body 1 according to an embodiment of the present invention)
　FIG. 1 is an automobile structural member for squeezing molding 1 according to this embodiment (hereinafter, simply referred to as "drawing body 1") part of the structure is an explanatory view schematically showing.
[0029]
　Drawing body 1, the plate thickness is the aperture formed body between cold made of a high tensile steel sheet or hot having a tensile strength of at least 980MPa is 0.7 ~ 3.2 mm.
　Thickness is preferably 0.8 ~ 1.8 mm, more preferably 0.8 ~ 1.4 mm.
　Tensile strength is preferably at least 1180 MPa, and more preferably at least 1310MPa.
　It is preferred that the upper limit of the tensile strength of the high-tensile steel plate is 1800MPa for ensuring practicality.
　Drawing body 1, as shown in FIG. 1, top plate 2, the first convex ridge portion 3, the second convex ridge portion 4, the side walls 5, end walls 6, Sumikabe 7,凹稜line portion 8 and the outward constituted by the flange 9.
[0030]
　Top plate 2 has a substantially flat, there extends in the first direction d1 indicated by double-headed arrow in FIG. Top plate 2 need not be planar, but may be curved. Two first convex ridge portion 3, 3 in the second direction d2 (FIG. 1 is a width direction of the top plate portion 2 in a direction indicated by double-headed arrow, perpendicular to the first direction d1 and the top plate 2 are formed continuously on both sides of the direction) along the.
[0031]
　Second convex ridge portion 4, together with the adjacent endmost portion 2a of the first direction d1 of the top plate 2, is continuously formed in the two first protruding ridgeline portions 3,3. Two side walls 5 and 5 has a shape along the plane, it is formed adjacent each of the two first projecting ridge portion 3,3. End wall 6 has a shape along the plane, are formed adjacent to the second convex ridge portion 4.
[0032]
　Two corner walls 7, 7 and each of the two side walls 5 and 5, together with the adjacent end wall 6, in plan view (i.e., when viewed from the direction perpendicular to the first direction d1 and the second direction d2 ) are formed curved. Further, two corners walls 7, 7, respectively, adjacent to the boundary region between the first convex ridge portion 3 and the second convex ridge portion 4. 凹稜 line portion 8, two side walls 5,5, end walls 6, and is formed adjacent to the two corner walls 7,7. Furthermore, the outward flange 9 is formed adjacent to the 凹稜 line portion 8.
[0033]
　In Figure 1, but illustrating only the vicinity of the top end portion 2a of the first direction d1 of the top plate 2, as shown in FIG. 2, another endmost portion 2b of the first direction d1 of the top plate 2 also, the second convex ridge portion 4, the end wall 6, Sumikabe 7,7,凹稜line portion 8 and the outward flange 9 may be formed. That is, the end wall 6 may be formed only on one end of the top plate 2 may be formed at both ends of the top plate 2.
　Although not shown, top plate 2 may be a T-shaped or Y-shaped, in which case, it is sufficient that the end wall is formed on one or more ends of the top plate 2.
[0034]
　In drawing body 1, the curvature of the cross-section perpendicular to the two respective extending direction of the first convex ridge portion 3,3 radius RPL2, curvature of the cross-section perpendicular to the extending direction of the second convex ridge portion 4 radial Rps2, and, both the radius of curvature Rd2 of the cross-section perpendicular to the extending direction of the凹稜line portion 8 is at 30mm or less, thereby being possible to obtain the stiffness and torsional flexural rigidity higher.
　Curvature radius RPL2, curvature Rps2, and the curvature radius Rd2 are preferably both is 20mm or less, and more preferably 10mm or less.
[0035]
　Further, the drawing member 1, perpendicular from the boundary between the outward flange 9 and凹稜line section 8, at 1.0mm spaced locations along the Sumikabe 7,7, in the first direction d1 and the second direction d2 corner radius Rpc2 is the radius of curvature of Sumikabe 7,7 viewed from the direction is not more 30mm or less, thereby being possible to obtain the stiffness and torsional flexural rigidity higher.
　Corner radius Rpc2 is preferably 20mm or less, and more preferably 10mm or less.
[0036]
　Further, in a direction perpendicular to the top plate 2, top plate 2 and the distance a is molded depth h2 of the outward flange 9 is not less 40mm or more, thereby, to obtain torsional stiffness and high bending stiffness It is possible.
　Forming height h2 is preferably 50mm or more, and more preferably 70mm or more.
[0037]
　In the prior art, tensile strength of not less than 980 MPa, U-shaped cross section, or, if you try to press forming a member having a rectangular cross-sectional shape in the above forming height 40 mm, radius of curvature RPL2, the radius of curvature rps2, curvature radius Rd2 and, it is difficult to reduce the corner radius RPC2, it has been difficult also exhibit high rigidity due to wrinkles generated in the sidewalls were possible if molding.
　In drawing body 1 according to the present embodiment, by using the manufacturing method and apparatus described later, even if the molded depth h2 a case of the above 40 mm, the occurrence of wrinkles in the end wall and the side wall or the like suppressed and while, being possible to obtain a desired curvature radius and corner radii.
　Incidentally, the radius of curvature Rpl2 If molded depth of more than 100 mm, the radius of curvature Rps2 curvature radius Rd2 and, it is difficult to corner radii Rpc2 below forming height h × 0.3 mm.
[0038]
　Drawing body 1, by the end wall 6 is formed on the top end portion 2a of the first direction d1, rather than the open cross-sectional shape of the hat-type, the end wall 6, Sumikabe 7,7, 凹稜 lines 8 and constituted by an outward flange 9, U-shaped cross section, or has a rectangular cross-sectional shape. Therefore, it is possible to exert a high flexural rigidity and torsional rigidity, yet lightweight. Therefore, drawing body 1, capable of expressing a high withstand collision characteristics, for example, the side sill, bumper beam, A pillar lower panel, is suitably used in an automobile structural member, such as A-pillar or B-pillar.
[0039]
　Figure 3A ~ 3C are explanatory views schematically showing the case of using the aperture formed body 1 as a side sill.
　Figure 3A is an explanatory view showing a state before joining the aperture formed body 1 as a side sill to the A-pillar lower panel 10.
　3B and 3C are explanatory views showing the first and second examples of embodiment of bonding the diaphragm molded body 1 as a side sill to the A-pillar lower panel 10.
[0040]
　As shown in FIG. 3A, drawing body 1 as the side sill, the end wall 6, Sumikabe 7, by being constituted by 凹稜 line portion 8 and the outward flange 9 has a U-shaped cross section.
[0041]
　Therefore, as in the first example shown in FIG. 3B, the longitudinal direction of the outermost end portion 2a of the diaphragm molding 1 as sill, it abutted against the inner surface 10a of the A-pillar lower panel 10 further endmost portion 2a and the inner surface by welding 10a, it is possible to increase the rigidity of the bonded body of the molded body 1 and the a-pillar lower panel 10 stop as sill, the bending rigidity and twisting of the engine compartment through the a-pillar lower panel 10 and the dash panel it is possible to increase the rigidity.
[0042]
　Also, as in the first example shown in FIG. 3B, placing the top end 2a aperture of the molding 1 in the longitudinal direction of the side sill, apart from each other without abutting the inner surface 10a of the A-pillar lower panel 10 it is also possible. For example, as in the second example shown in the 3C, the outwardly directed flange 9, A-pillar by welding superimposed with an outward flange 10b of the lower panel 10, the diaphragm formed body 1 and the A-pillar lower panel as sill it is possible to increase the rigidity of the conjugates with 10, it is possible to increase the bending rigidity and torsional rigidity of the engine compartment through the a-pillar lower panel 10 and the dash panel.
[0043]
(2 production apparatus for an automobile structural member for drawing body according to an embodiment of the present invention)
　manufacturing apparatus according to the present embodiment is a manufacturing apparatus for draw-forming body 1, first die, the first punch and the It comprises a one blank holder, the second die, the second punch, the second blank holder and tightening tools.
[0044]
(2-1. First die, the first punch and the first blank holder)
　FIG. 4, first die, the first intermediate drawing which is formed by first forming die comprising a first punch and a first blank holder is an explanatory view showing the body 11. Incidentally, FIG. 4 shows the shape of the to the middle of the first direction d1 of the first intermediate throttle body 11, the rest of the shape is omitted.
[0045]
　First die, the first punch and the first blank holder has a tensile strength by performing a press working by drawing in more blanks or preform 980 MPa, to produce a first intermediate throttle body 11.
[0046]
　First intermediate throttle body 11, as shown in FIG. 4, the intermediate top panel section 12, two intermediate first convex ridge portion 13, an intermediate second convex ridge portion 14, two intermediate side walls 15, the intermediate end wall 16 , composed of two intermediate angles wall 17, intermediate 凹稜 line portion 18 and the intermediate outward flange 19.
[0047]
　Intermediate top plate 12 has a substantially flat, there extends in the first direction d1 indicated by double-headed arrow in FIG. The two intermediate first convex ridge portions 13, a direction indicated by double-headed arrow in the second direction d2 (FIG. 4 is the width direction of the intermediate top panel section 12, perpendicular to the first direction d1 and the intermediate ceiling They are formed respectively in succession on either side of the direction) along the plate part 12.
[0048]
　Intermediate second convex ridge portion 14, together with the adjacent endmost portion 12a of the first direction d1 of the intermediate top panel section 12, is continuously formed in the two intermediate first convex ridge portion 13, 13. Two intermediate side walls 15, 15 is formed adjacent each of the two intermediate first convex ridge portion 13, 13. Intermediate end wall 16 is formed adjacent to the intermediate second convex ridge portion 14.
[0049]
　Two intermediate angles walls 17 and 17, and each of the two intermediate side walls 15 and 15, in a plan view with adjacent intermediate end wall 16 (i.e., from a direction perpendicular to the first direction d1 and the second direction d2 seen) are formed curved. Further, two intermediate angles walls 17 and 17, respectively, adjacent to the boundary region between the intermediate first convex ridge portion 13 and the intermediate second convex ridge portion 14. Intermediate 凹稜 line section 18, two intermediate side walls 15, 15 are formed adjacent to the intermediate end wall 16 and two intermediate angles walls 17, 17. Furthermore, the intermediate outward flange 19 is formed adjacent to the intermediate 凹稜 line section 18.
[0050]
　In the first intermediate throttle body 11, two intermediate curvature of the cross-section perpendicular to the respective extending direction of the first convex ridge portion 13 radially RPL1, cross section perpendicular to the extending direction of the intermediate second convex ridge portion 14 radius of curvature RPS1, and the curvature radius Rd1 section orthogonal to the extending direction of the intermediate 凹稜 line unit 18, respectively, to two respective extending direction of the first convex ridge portions 3, 3 of the drawing body 1 orthogonal cross-section of the curvature radius RPL2, second convex ridge portion 4 in the extending direction perpendicular curvature of the cross-section radius Rps2, and greater than the radius of curvature Rd2 of the cross-section perpendicular to the extending direction of the 凹稜 line portion 8.
[0051]
　Curvature radius Rpl1 the first intermediate throttle body 11, the radius of curvature Rps1 and, the radius of curvature Rd1 are each drawing body 1 radius of curvature RPL2 radius of curvature Rps2 and, 1.2 to 30 times the curvature radius Rd2 it is in the first step and second step, desirable to mold without causing cracks or wrinkles is.
[0052]
　From the boundary between the intermediate outward flange 19 and the intermediate 凹稜 line portion 18, at 1.0mm spaced locations along an intermediate angle wall 17, intermediate angle viewed from the direction perpendicular to the first direction d1 and the second direction d2 the radius of curvature of the walls 17 and 17 intermediate the corner radius Rpc1 is larger than the corner radius Rpc2 of drawing body 1. Intermediate corner radii Rpc1, in the first step and the second step from 1.2 to 30 times the corner radius RPC2, desirable to mold without causing cracks or wrinkles. Intermediate corner radii Rpc1 is more preferably 1.7 to 2.5 times the corner radius RPC2.
[0053]
　Further, in a direction perpendicular to the intermediate top panel section 12, the intermediate molded depth h1 is greater than the forming height h2 of the drawing body 1 is a distance between the middle top wall 12 and the intermediate outward flange 19. Intermediate molded depth h1, it is 1.1 to 2.0 times of the molded depth h2 is in a second step, desirable to mold without causing cracks or wrinkles.
　Intermediate molded depth h1 is more preferably 1.2 to 1.5 times of the molded depth h2.
[0054]
(2-2. Second die, the second punch and the second blank holder)
　FIG. 5A ~ 5C are second die 21, the second punch 22, the second molding die and cam 24 with the second blank holder 23 using an explanatory diagram showing a first stage to third stage from the first intermediate aperture formed body until the production of draw-forming member via the second intermediate stop moldings. In order to make the drawings easy to see in FIG. 5A ~ FIG 5C, the second die 21, the second punch 22, showing the working surface of the second blank holder 23 and the cam 24.
[0055]
　Figure 5A, as shown in FIG. 5B, the second die 21 is housed inside the first intermediate throttle body 11. Second blank holder 23 presses the outer edge portion of the first intermediate throttle body 11 housed. Further, the second punch 22 performs press working by draw forming the first intermediate throttle body 11 by relatively moving the clamping direction relative to the second die 21.
[0056]
　Thus, the radius of curvature Rpl1 the first intermediate product 11 shown in FIG. 4, the radius of curvature Rd1, and it is possible to reduce the forming height h1, drawing body 1 equivalent radius of curvature RPL2 curvature radius Rd2, and to produce a second intermediate product 31 having a molded depth h2.
[0057]
(2-3. Tightening tool)
　In the following description, take the case of using the cam 24 as tensioning tool as an example, tightening tool is not intended to be limited to a cam 24, an intermediate second intermediate aperture formed body 31 it can be used equally as long as a tool that can reduce the intermediate corner radius Rpc1 presses the end wall 16 in the first direction d1.
[0058]
　When using a cam 24 as a tightening tool, the cam, the second punch 22 and the second blank holder 23, as the case mechanical mechanism movement of the press slide which moves in the vertical direction which the second die 21 is mounted movable by being converted into lateral movement through.
[0059]
　When using a non-cam may be used a plate attached to a hydraulic device or an electric apparatus that operates independently from the press slide.
[0060]
　Next, as shown in FIG. 5C, the cam 24 is in a state where the second die 21, the second punch 22 and the second blank holder 23 has restrained the second intermediate aperture formed body 31, the second intermediate aperture formed body 31 intermediate end wall 16 to press an intermediate corner radii Rpc1 in the first direction d1, by reducing the radius of curvature RPS1, the corner radius Rpc2 and curvature radius Rps2 of drawing body 1.
[0061]
　At this time, the second punch 22, by incorporating the inner pad 25 to move in the direction different from the pressing direction, presses the inner surface of the intermediate end wall 16 of the second intermediate aperture formed body 31, resulting in an intermediate end wall 16 it is possible to suppress the wrinkles.
[0062]
　Figure 6 is a top cross-sectional view showing over time the molding situation when the cam 24 is located outside of the second die 21.
　Figure 7 is a side sectional view showing over time the molding situation when the cam 24 is located outside of the second die 21.
　8 is an explanatory diagram over time showing the molding conditions when the cam 24 is disposed in the second die 21.
[0063]
　As shown in FIGS. 6 and 7, the cam (tightening tool) is moved may be freely positioned outside of the second die 21 in the first direction d1, Alternatively, as shown in FIG. 8, the from the outside of the two dies until the inside it may be arranged movably to the first direction d1.
[0064]
(3. manufacturing method of an automobile structural member for drawing body according to an embodiment of the present invention)
　In the manufacturing method according to the present embodiment, by going through the first step to the third step below the stop moldings 1 manufacturing.
　First step: tensile strength first die than a blank 980 MPa, by performing press working by drawing using a first punch and a first holder, forming the first intermediate throttle body 11 shown in FIG.
　Second step: FIG. 5A, as shown in FIG. 5B, the first intermediate throttle body 11, the second die 21, and by press molding using a second punch 22 and the second blank holder 23, the second intermediate producing drawing member 31.
　Third Step: As shown in FIG. 5C, the second die 21, in the second punch 22 and the second blank holder 23 while restraining the second intermediate aperture formed body 31, the diaphragm second intermediate by a cam 24 molded bodies 31 the intermediate end wall 16, intermediate the corner radius Rpc1 presses the first direction d1, and by reducing the radius of curvature RPS1, corner radii Rpc2 of drawing body 1, and the radius of curvature Rps2.
[0065]
　Incidentally, after the third step, if necessary, may be excised pressing portion by the second blank holder 23 of the draw-forming body 1.
[0066]
(Example)
　were molded pressed bodies 40-46 shown in FIGS. 9A ~ Figure 9G using 1180MPa class high-tensile steel plate thickness is 1.0 mm.
　Pressed bodies 40 shown in FIG. 9A is a molded body manufactured by the conventional bending method, a structure that has no end wall.
　Pressed bodies 41-46 shown in FIGS. 9B ~ FIG 9G is a molded body manufactured by drawing method shown in FIGS. 5A ~ FIG 5C, a structure having an end wall at one end.
[0067]
　In press-molded body 40 shown in FIG. 9A, the curvature radius Rx of the convex ridge portion was 5 mm.
　In pressed bodies 41-46 shown in FIGS. 9B ~ FIG 9G, the radius of curvature Rx of the convex ridge portions each have 5mm, 10mm, 20mm, 30mm, 40mm, and 50 mm.
[0068]
　As shown in FIGS. 9A ~ Figure 9G, to the flange of each of the press-molded body 40-46, resistance spot plate thickness 1.0 mm, tensile strength of high tensile strength steel of 1180MPa class as the back plate 50 (closing plate) by attaching by welding, to create a test object a ~ G. Locations indicated by black circles in FIGS. 9A ~ Figure 9G is a spot weld, the welding pitch is 30 mm, the weld diameter is 3.3 mm.
[0069]
　Figure 10 is an explanatory view showing the measurement conditions of the torsional rigidity relative to the test object A, unit dimensions are in mm.
　As shown in FIG. 10, the one end portion relative to the test object A, including the back plate 50 completely restrained, twisting relative to automobile structural member by displacing the colored region in FIG. 10 in the arrow direction displacement were examined the torsional rigidity given.
　Against the test object B ~ G examined torsional stiffness in the same manner, each of 1.5 deg. The moment generated at the time of rotation are summarized in the graph of FIG. 11.
[0070]
　As shown in the graph of FIG. 11, the torsional stiffness of the test body B ~ G having a U-shaped cross section is increased significantly from the torsional rigidity of the test object A having an open cross-sectional shape of the hat-, the specimen F, the radius of curvature Rx of the convex ridge portion as G exceeds 30 mm, the torsional rigidity is decreased.
[0071]
　Furthermore, it was measured bending stiffness using a test object A ~ G created in the same manner as described above.
　Figure 12 is an explanatory view showing the measurement conditions of the bending rigidity with respect to the specimen A, the unit of dimension is in mm.
　As shown in FIG. 12, in the test object A, to the colored region in FIG. 12 was examined flexural stiffness by applying a displacement to the position indicated by the arrow.
　Examine the same bending rigidity against the test object B ~ G, are summarized bending load at each 1.5mm displacement imparted to the graph of FIG. 13.
[0072]
　As shown in the graph of FIG. 13, the bending rigidity of the test object B ~ G having a U-shaped cross section is increased greatly than the bending stiffness of the test object A having an open cross-sectional shape of the hat-, the specimen F, the radius of curvature Rx of the convex ridge portion as G exceeds 30 mm, the bending rigidity is decreased.
[0073]
　Incidentally, where as a comparative example, the press-molded body having the same dimensions as pressed bodies 41 shown in FIG. 9B, were prepared by performing the drawing without operating the inner pad 25 shown in FIGS. 5A ~ FIG 5C, the end significant wrinkle occurs on the wall. Where this from the press-molded body in the same manner as above to create a device under test, to measure the torsional rigidity and flexural rigidity in the same manner as above, 1.5 deg. Moment generated during rotation 600N · m, flexural weighted at 1.5mm displacement imparting is 5.1KN, inability achieve high torsional stiffness and flexural rigidity were observed.
Industrial Applicability
[0074]
　According to the present invention, while lighter, automotive structural member for drawing body capable of enhancing the resistance to collision characteristics with high rigidity, diaphragm manufacturing method and automotive structural members of a motor vehicle structural member for drawing body it is possible to provide an apparatus for manufacturing a molded body.
DESCRIPTION OF SYMBOLS
[0075]
1 automobile structural member for drawing body
2 top plate
3 first convex ridge portion
4 second convex ridge portion
5 side wall
6 end wall
7 Sumikabe
8凹稜line portion
9 outward flange

The scope of the claims
[Requested item 1]
　Tensile strength is a molded body diaphragm or automotive structural members 980 MPa,
　a top plate portion extending in the first direction,
　of the top plate portion, the second along the perpendicular to the first direction and the top plate portion two first convex ridge portion adjacent to both sides of the direction,
　and a second convex ridge portion continuous with said two first convex ridge portion together with adjacent endmost portion of the first direction of the top plate portion,
　two side walls adjacent to the two first projections ridgeline portion of
　the end wall adjacent to the second convex ridge portions,
　the two side walls, and, together with the adjacent said end wall, said first direction and said and two corner walls have a curved shape when viewed from the direction perpendicular to the second direction,
　and凹稜line section adjacent to the two side walls, said end walls and said two corner walls,
　adjacent to the凹稜line section an outward flange,
provided with,
　the two first projections ridgeline portion, Oyo said second convex ridge portion The凹稜line portion is less than the radius of curvature 30mm none of the cross section perpendicular to the respective extending direction,
　from the boundary between the outward flange and the凹稜line portion, 1.0 mm spaced along said angle wall in position, the first direction and the corner radius is the curvature radius of the corner wall as viewed from a direction perpendicular to the second direction is at 30mm or less,
　in a direction perpendicular to the top plate portion, the top plate distance a is molded depth of the outward flange is 40mm or more
automotive structural members throttle moldings, characterized in that.
[Requested item 2]
　Wherein the first opposite ends, said end wall, said two corner walls, the凹稜line section and the outward flange is formed
automotive structural members throttle molded product according to claim 1, characterized in that.
[Requested item 3]
　Side sill, bumper beam, A pillar lower panel, A-pillar or B-pillar
automobile structural member for squeezing molding according to claim 1 or 2, characterized in that.
[Requested item 4]
　A method of manufacturing a motor vehicle structural member for drawing body according to any one of claims 1 to 3,
　the tensile strength of more than 980MPa blank, the first die, the first punch and the first blank holder using by performing press working by drawing Te, the intermediate top panel section extending in the first direction, two intermediate first convex adjacent to either side of the second direction perpendicular to the first direction of the intermediate top panel section a ridge portion, the intermediate second convex ridge portion continuing to said two intermediate first convex ridge portion with adjacent endmost portion of the first direction of the intermediate top panel section, the two intermediate first convex ridge and two intermediate side walls continuous to the section, and an intermediate end wall adjacent to said intermediate second convex ridge portions, the two intermediate side walls, and, together with the adjacent to the intermediate end wall, said first direction and said second the curved shape when viewed from the direction perpendicular to the direction Provided with two intermediate angles wall, the two intermediate side walls, and an intermediate凹稜line section adjacent to the intermediate end wall and the two intermediate angles walls, and an intermediate outwardly flange adjacent to said intermediate凹稜line section, the two intermediate first convex ridge portions, the intermediate second convex ridge portion and the intermediate凹稜line section, the radius of curvature of the cross-section perpendicular to the respective extending direction are both, the two of the draw-forming member the first convex ridge portion, the boundary between the second convex ridge portion and the凹稜line portion larger than the radius of curvature of the cross-section perpendicular to the respective extending direction of the intermediate outward flange and the intermediate凹稜line section, wherein in along an intermediate angle wall 1.0mm spaced locations, the first direction and intermediate the corner radius is the radius of curvature of the intermediate angle wall viewed from the direction orthogonal to the second direction, wherein the draw-forming member the corner and a half of Sumikabe Greater than the in the intermediate ceiling plate perpendicular to the portion, the intermediate top panel section and the intermediate outward first intermediate molded depth is greater than the forming height of the drawing which is a distance between the flange a first step of forming an intermediate drawing member,
　wherein the first intermediate aperture formed body, the second die performs press working by drawing using a second punch and a second blank holder, the two intermediate first convex ridge portions, the intermediate of the second convex ridge portion and the intermediate凹稜line section, by reducing the radius of curvature and said intermediate molded depth of the cross-section perpendicular to the respective extending direction, the said diaphragm molding 2 the first convex ridge portion of the one, of the second convex ridge portion and the凹稜line portion, the second molding a second intermediate aperture formed body having a radius of curvature and the forming height of the cross-section perpendicular to the respective extending direction a step,
　the second An intermediate aperture formed body, said second die, said second punch and said second while constrained by the blank holder, said intermediate end wall of said first intermediate aperture formed body by the inner pad built in the second punch a third step of reducing the intermediate corner radius of the intermediate angle wall presses the intermediate end wall of the second intermediate aperture formed body to said first direction by tightening the tool while pressing the inner surface of,
comprises
the method for producing a motor vehicle structural member for drawing body characterized.
[Requested item 5]
　The intermediate molded depth is 1.1 to 2.0 times of the molded depth,
　the two intermediate first convex ridge portions, the intermediate second convex ridge portion and the intermediate凹稜line portions each radius of curvature are both the two first projecting ridge portion, 1.2 to 30 times of the second convex ridge portion and each said凹稜line section curvature radius,
　the intermediate corner radius, the corner radius 1 a .2 to 30 times
the production method of an automobile structural member for squeezing molding according to claim 4, characterized in that.
[Requested item 6]
　The tightening tool is movably disposed outside of the second die to the first direction
a manufacturing method of a motor vehicle structural member for squeezing molding according to claim 4 or 5, characterized in that.
[Requested item 7]
　The tightening tool is movably disposed externally of the second die to the first direction until the internal
production process of an automobile structural member for squeezing molding according to claim 4 or 5, characterized in that.
[Requested item 8]
　A manufacturing apparatus for an automobile structural member for drawing body according to any one of claims 1 to 3,
　a first molding die having a first die, the first punch, and a first blank holder,
　the two die, and a second molding die having a second punch, and the second blank holder,
　and tightening tool,
comprising a
　said first molding die, the tensile strength of the press working by drawing in more blanks 980MPa by performing the intermediate top panel section extending in the first direction, and wherein the two intermediate first convex ridge portion adjacent to each side of the second direction perpendicular to the first direction of the intermediate top panel section, the intermediate ceiling the two intermediate second convex ridge portion continuing to the intermediate first convex ridge portion, two intermediate successive said two intermediate first convex ridge portion as well as adjacent to the outermost end of the first direction of the plate portion a side wall, and an intermediate end wall adjacent to said intermediate second convex ridge portion The two intermediate side walls, and, together with the adjacent to the intermediate end wall, and two intermediate angles wall having a curved shape when viewed from the direction perpendicular to the first direction and the second direction, wherein the two intermediate side walls , an intermediate凹稜line section adjacent to the intermediate end wall and the two intermediate angles walls, wherein an intermediate outwardly flange adjacent the intermediate凹稜line section, the two intermediate first convex ridge portions, said intermediate first two convex ridge portion and the intermediate凹稜line section, the radius of curvature of the cross-section perpendicular to the respective extending directions are both the two first convex ridge portion of the draw-forming member, said second projecting ridge portion and larger than the radius of curvature of the cross-section perpendicular to the respective extending direction of the凹稜wire section, from the boundary between the intermediate outward flange and the intermediate凹稜line unit, position 1.0mm spaced along said intermediate angle wall in said first direction Intermediate corner radius of fine radius of curvature of the intermediate angle wall viewed from the direction perpendicular to the second direction, greater than the corner radii of the corner wall of the drawing member, a direction perpendicular to the intermediate top panel section in, molding the intermediate top panel section and the intermediate outward flange and the intermediate molded depth stop the compact the molding depth first intermediate aperture formed body is larger than which is the distance,
　the second molding die type performs press molding by draw forming on the first intermediate aperture formed body, said two intermediate first convex ridge portions, the intermediate of the second convex ridge portion and the intermediate凹稜wire portion, each of the extending direction by reducing the radius of curvature and said intermediate molded depth of the cross section perpendicular, the two first projections ridgeline portion of the draw-forming member, said second projecting ridge portion and the凹稜line portions, each extending direction song of the cross section perpendicular to the Molding the second intermediate diaphragm molded product having a rate radius and the molded depth,
　the tightening tool, said second intermediate aperture formed body, while constrained by the second molding die, said second punch wherein the intermediate angle wall by pressing the intermediate end wall of the second intermediate aperture formed body to said first direction while pressing the inner surface of said intermediate end wall of said first intermediate aperture formed body by a built-in inner pad reducing the intermediate corner radius
manufacturing apparatus for an automobile structural member for drawing body, characterized in that.
[Requested item 9]
　The intermediate molded depth is 1.1 to 2.0 times of the molded depth,
　the two intermediate first convex ridge portions, the intermediate second convex ridge portion and the intermediate凹稜line portions each radius of curvature , said two first projections ridge portion, 1.2 to 30 times of the second convex ridge portion and each said凹稜line section curvature radius,
　the intermediate corner radius, 1.2 ~ of the corner radius 30 times
manufacturing apparatus for an automobile structural member for squeezing molding according to claim 8, characterized in that.
[Requested item 10]
　The tightening tool, said second die outside is disposed movably to the first direction of
the manufacturing apparatus of an automobile structural member for squeezing molding according to claim 8 or 9, characterized in that.
[Requested item 11]
　The tightening tool, said second die from outside is arranged movably to the first direction to the interior of the
production apparatus for an automobile structural member for squeezing molding according to claim 8 or 9, characterized in that.