Technical field
[0001]The present invention, moldings, structural member comprising a molded body, and to a process for the production of moldings.
BACKGROUND
[0002]Conventionally, from the viewpoint of weight reduction and safety improvement in motor vehicles, the tensile strength can be obtained by press-forming the above hard materials 440MPa molded article is used as a vehicle body structural member (e.g., members constituting the frame) ing.
[0003]
　For example, Patent Document 1, the hollow structural member to be used as a structural member for an automobile is disclosed. Hollow structural member disclosed in Patent Document 1, two members having an open cross-sectional shape has a structure obtained by bonding (hereinafter. Referred to component). Each component has an upper surface portion (bottom portion), has a pair of side wall portions, and a pair of flanges. One flange is formed from one end of one side wall portion so as to extend toward the other side wall portion, the other flange is formed to extend toward the one side wall portion from one end of the other side wall portion there. In the hollow structural member, a pair of flanges of one of the components, a pair of flanges of the other component member are joined.
CITATION
Patent Document
[0004]
Patent Document 1: JP 2003-54445 JP
Summary of the Invention
Problems that the Invention is to Solve
[0005]
　Patent Document 1, the hollow structural member having the configuration described above, by appropriately adjusting the length, etc. of the junction of the flanges, to be able to increase the energy absorption amount of the hollow structural member during bending deformation Are listed.
[0006]
　However, as a result of various studies of the present inventors, even a hollow structural member having the above configuration, depending on the direction of the bending load applied to the hollow structural member, it may not be exhibited desired bending strength properties It was found.
[0007]
　The present invention, shaped bodies with flexural excellent rigidity against deformation, and an object thereof is to provide a method of manufacturing a structural member, and moldings.
Means for Solving the Problems
[0008]
　Patent Document 1 described above, by inwardly flange on both sides or one side of the flange, it is possible to alter the bending load characteristics increasing energy absorption, without increasing the cost, excellent shock absorption hollow structural member is described that can be produced with. However, the hollow structural member described in Patent Document 1, the entire member is shaped into a straight line, if utilized as a structural member, usable range is limited. A hollow structural member described above, when utilized as a vehicle body structural member of a motor vehicle having a flow surface shape is particularly usable range is narrowed.
[0009]
　Accordingly, the present inventors have, to extend the reach of the molded body, the molded body having a pair of flanges which are connected to both ends of the body portion and the body portion of the open cross-sectional shape, the structure is curved body portion It was studied in detail. As a result, the inward flange at least one flange, furthermore, that the inward flange shaped bodies is curved along the body portion, it was found that the flexural excellent rigidity against deformation can be obtained.
[0010]
　Further, the present inventors have conducted extensive study also process for producing a molded article. As a result, the present inventors have further obtained a finding A ~ C of listed below.
[0011]
The molded article having a (A) inward flange, even be molded by conventional pressing methods according to the punch and die will form the inward flange with respect to pressing direction. Therefore, in the press-forming method so far, it can not be molded inward flange.
[0012]
In the molded body that is shaped (B) the main body portion and a pair of flanges linearly, in obtaining a molded body by processing a blank, the main body portion and the flange both does not occur elongation and contraction in the longitudinal direction . Therefore, the longitudinal elongation (plastic deformation) in the perpendicular cross-section only, it is possible to manufacture a molded article. On the other hand, in the molded body portion and a flange is curved, when obtaining a molded body by processing a blank, the main body portion and the flange both produces elongation and contraction in the longitudinal direction. Therefore, the conventional manufacturing method, the molded body portion and a flange is curved, it is difficult to obtain a desired shape.
[0013]
And multi-step the pressing step (C) the molded body, a press molding method suitable for each molding site (various bending, drawing) by performing press working using, and in the optimal order, an inward flange It can produce a molded body having a. More specifically, the splits the processing steps in the width direction of the long blank, the structure of the mold used, by changing the structure that can be used in combination with bending pad aperture and the pad, a blank during press working the incremental strain Control. Accordingly, tensile strength from the above the blank 440 MPa, can be produced a molded body having an inward flange.
[0014]
　The present invention has been made based on the above findings.
[0015]
　The present invention is as follows.
[0016]
(1) has an open cross-sectional shape, the continuous top plate, a first vertical wall portion provided continuously to one end portion in the width direction of the top plate, and the other end portion in the width direction of the top plate body part and, having a second vertical wall portion provided with
　a first flange which is provided continuously to the end opposite to the top plate in the first vertical wall portion,
　the second vertical wall portion the said top plate and a second flange which is provided continuously at the opposite end in the tensile strength is a molded article comprising the above steel 440 MPa,
　the first flange and the second flange ones of the at least one flange extends towards the other flange of said first flange and said second flange from said first vertical wall portion and the second vertical wall portion,
　said body portion and said at least one of flanges, perpendicular to the top plate Viewed from direction curved along one another, moldings.
[0017]
(2) the said other flange of the first flange and the second flange is curved along the body portion when viewed from the direction perpendicular to the top plate, shaped according to the above (1) body.
[0018]
(3) above and molded body described in (1) or (2) is joined to said first flange and said second flange so as to connect the second flange and the first flange of the molded body and and a joining member, the structural member.
[0019]
(4) the joining member is a molded body described in the above (1) or (2),
　said first flange of the first flange and the other of the shaped body of one of the shaped body are joined , with the second flange of the second flange and the other of the shaped body of one of the shaped body are joined, the structural member according to the above (3).
[0020]
(5) the structural member, the vehicle body of the front pillar, roof rail, a front side member, a side sill, rear side member is a crush box or crush can, the structural member according to the above (3) or (4).
[0021]
; (6) first having 1-3 step, the (1) or (2) process for producing a molded article described in the following
　in elongated tensile strength becomes the above steel 440MPa blank: first step first punch, the first die, by performing the pad draw forming using a first pad and a first blank holder, a first portion having a and curved portions provided on one side in the width direction of the blank and of the blank producing a first intermediate product of a long and a second portion connected to and the first portion provided on the other side in the width direction,
　the second step: 90 Press direction from the pressing direction in the first step some by degrees turning of the first portion of the first intermediate product, by performing pad drawing using a second die and the second blank holder while holding the second punch and a second pad, before Producing the second intermediate molded article of elongated and a second portion consecutive to the first flange and the first vertical wall portion and the first vertical wall portion,
　the third step: the pressing direction, the second step as the same direction as the first step from the press direction to turn 90 degrees in the third die pressing the part with the third punch and third pad in the width direction of the second portion of the second intermediate molded article by performing pad bending using, or by performing pad draw forming using a third die and the third blank holder while holding a part the third punch and third pads, said first vertical wall forming said top plate portion continuous to the section, and the second vertical wall portion continuous to the top plate portion and a second flange that is continuous with the second vertical wall portion.
[0022]
(7) moldings produced by the manufacturing method described in the above (6).
The invention's effect
[0023]
　According to the present invention, it is possible to obtain a molded body and a structural member having bending excellent rigidity against deformation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024]
[1] 1 (a) is a perspective view showing a molded body according to an embodiment of the present invention, FIG. 1 (b) is a bottom view of the molded body shown in FIG. 1 (a).
2 is a diagram showing a vehicle body molded body is utilized in accordance with an embodiment of the present invention.
FIG. 3 is a perspective view illustrating a structural member according to an embodiment of the present invention.
[4] FIG. 4 (a) is an isometric view showing a press die used in the first step, FIG. 4 (b) ~ FIG 4 (f), the first intermediate produced in the first step the molded article is an isometric projection viewed from various directions.
[5] FIG. 5 (a) is an isometric view showing a press die used in the second step, FIG. 5 (b) ~ FIG 5 (f), the second intermediate produced in the second step the molded article is an isometric projection viewed from various directions.
[6] FIG. 6 (a) is an isometric view showing a press die used in the third step, FIG. 6 (b) ~ FIG 6 (g) is a molded body produced in the third step is an isometric view as seen from various directions.
FIG. 7 is in the first to third step, the first intermediate product is an explanatory view showing the shape and sheet thickness reduction ratio of the second intermediate moldings and moldings.
[8] 8 (a) shows a mold used in the first step, FIG. 8 (b) shows a mold used in the second step, FIG. 8 (c) a mold used in the third step show.
[9] FIG. 9 (a) ~ FIG. 9 (c) is an isometric projection viewed from various directions moldings produced by the first to third step.
FIG. 10 is a molding condition in the first to third steps, are collectively the thickness reduction rate of each part of the produced molded bodies (%) and Y-direction movement amount of the material during the molding (mm) it is an explanatory diagram showing.
DESCRIPTION OF THE INVENTION
[0025]
　Hereinafter, with reference to the accompanying drawings, the molded body according to an embodiment of the present invention, the structural member, and process for producing a molded article will be described.
[0026]
　1. The configuration of the shaped body
　Figure 1 (a) is a perspective view showing a molded body 1 according to an embodiment of the present invention, FIG. 1 (b), a bottom view showing a molded body 1 shown in FIG. 1 (a) ( is a diagram) as viewed in the direction indicated by the arrow b.
[0027]
　Molding 1 has a tensile strength of pressed bodies made more steel 440 MPa.
[0028]
　FIG. 1 (a), (b), the molded body 1 includes a main body 100 having an open cross section, has a first flange 3, and a second flange 7. In this embodiment, the body portion 100 has a U-shaped section, the first vertical wall portion 4, a top plate 5, and a second vertical wall portion 6. Main body 100 is curved when viewed from the direction perpendicular to the top plate portion 5. In the present embodiment, the first vertical wall portion 4, the top plate portion 5 and the second vertical wall portion 6, respectively, are curved when viewed from the direction perpendicular to the top plate portion 5. Note that "when viewed from the direction perpendicular to the top plate", in other words, a "on the front surface or the back surface of the top plate as viewed from a vertical direction". The same goes for the following description.
[0029]
　The first vertical wall portion 4 is provided continuously to the first flange 3. Top plate 5 is provided continuously to the first vertical wall portion 4. The second vertical wall portion 6 is provided continuously on the top plate portion 5. Moreover, the second flange 7 is provided continuously to the second vertical wall portion 6.
[0030]
　FIG. 1 (a), with reference to (b), in the present embodiment, the first flange 3 extends from the end of the first vertical wall portion 4 toward the second flange 7. That is, the first flange 3 is inward flange extending inwardly of the body portion 100. The first flange 3 has a curved portion 3a is curved when viewed from the direction perpendicular to the top plate portion 5. When viewed from the direction perpendicular to the top plate portion 5, curved portion 3a is curved along the body portion 100. In the present embodiment, the entire first flange 3 are formed as a curved portion 3a. That is, in this embodiment, when viewed from the direction perpendicular to the top plate 5 are curved so that the main body portion 100 and the first flange 3 along each other. Therefore, in the present embodiment, the intersection line between the first flange 3 and the first vertical wall portion 4 (the boundary) is curved when viewed from the direction perpendicular to the top plate portion 5.
[0031]
　The second flange 7, from the end of the second vertical wall portion 6 and extends in a direction away from the first flange 3. That is, the second flange 7 is an outward flange extending outwardly of the body portion 100. Like the first flange 3, the second flange 7 has a curved portion 7a which is curved when viewed from the direction perpendicular to the top plate portion 5. When viewed from the direction perpendicular to the top plate portion 5, curved portion 7a is curved along the body portion 100. In the present embodiment, the entire second flange 7 is formed as a curved portion 7a. Therefore, in the present embodiment, intersection line between the second flange 7 and the second vertical wall portion 6 (boundary) is curved when viewed from the direction perpendicular to the top plate portion 5. As shown in FIG. 1 (b), when viewed from the direction perpendicular to the top plate portion 5, the first flange 3 (curved portion 3a), the second flange 7 (curved portion 7a) and the main body section 100, along with one another It is curved. In the present embodiment, when viewed from the direction perpendicular to the top plate portion 5, the first flange 3 (curved portion 3a), the second flange 7 (curved portion 7a) and the body portion 100 is curved in an arc shape, respectively. Further, in the present embodiment, the first flange 3 and the second flange 7 is provided in parallel to the top plate portion 5. Incidentally, the curved portion, when viewed from the direction perpendicular to the top plate, not only the portion which is curved in an arc shape with a uniform width in the flange also includes portions in which the width in the flange changes.
[0032]
　As described above, the first flange 3 is inward flange, the second flange 7 is outward flange. That is, the first flange 3 and the second flange 7 are both in cross-section (longitudinal direction of the molded body 1 (cross section perpendicular to the direction) indicated by an arrow L), toward substantially the same direction from the main body 100 It is formed to extend Te.
[0033]
　Thus, the molded body 1 obtained by the tensile strength is hard materials to form an inward flange with respect to 440MPa or more elongate blank (sheet) is capable of small section reduction, and good It has a cross-section efficiency.
[0034]
　Therefore, the molded body 1 may, for example, as shown in FIG. 2, a vehicle body structural member (e.g., front pillar, roof rail, a front side member, a side sill, rear side members, the crash boxes or crush can) be used preferably as a it can. For example, by applying the molded body 1 in the front pillar (A-pillar upper panel), it is possible to enhance the visibility for the driver to reduce the blind spot of the driver. Further, for example, the molded body 1 when applied to the side members, to reduce the interference of the part to be mounted on a vehicle, it is possible to increase the freedom of vehicle design. As a result, it is possible to control the bending mode at the time of collapse of the side members themselves, it is possible to improve the collision characteristics of the vehicle.
[0035]
　Incidentally, the molded body 1 according to the present embodiment, to receive a bending load first flange (inward flange) 3 in the stretching direction (the from end of the first vertical wall portion 4 toward the second flange 7) , it is preferably used as a structural member. If this molded body 1 is subjected to bending load as in-plane shear force to the flange surface can increase the deformation resistance acts. That is, in the molded body 1 according to the present embodiment, as compared with the molded article does not have an inward flange, high bending stiffness is obtained.
[0036]
　In the above embodiment, when viewed from the direction perpendicular to the top plate, although inward flange has been described a case where curved to bulge in a convex shape toward the outside of the main body, inward flange body portion it may be curved to bulge in a convex shape toward the inside. Further, in the above-described embodiment, the outward flange case has been described that is curved to bulge in a convex shape toward the inside of the main body, so as to expand in a convex shape outward flange toward the outside of the body portion it may be curved. In the above embodiments, the case has been described where the first flange 3 is inward flange, the first flange is shaped as an outward flange may be shaped second flange as inward flange. The first flange and the second flange may be shaped as inward flange together. In the above embodiments, a case has been described in which the entire flange is set in the curved portion, it is sufficient that the curved portion is formed on at least a portion of the flange.
[0037]
　2. Configuration of the structural member
　Figure 3 is a perspective view illustrating a structural member according to an embodiment of the present invention. As shown in FIG. 3, the structural member 2 according to the present embodiment is a structural member comprising a molded body 1 described above.
[0038]
　Structural member 2, a first flange 3 and a second flange 7 of the molded body 1 as a joining portion, by being joined to the joint member 9 has a closed section. In the present embodiment, as the bonding member 9, the molded body 1 is used. That is, in this embodiment, the structural member 2 has a configuration having a pair of molded body 1.
[0039]
　In the structural member 2 according to the present embodiment, the first flange 3 to each other are superposed and joined, together second flange 7 is superimposed and joined.
[0040]
　The structure member 2 shown in FIG. 3 is an example of a structural member according to the present invention, the configuration of the joint member 9 may be a molded body 1 different configurations. For example, joint member 9 may be a plate-shaped closing plate.
[0041]
　3. Process for producing a molded article
　molded body 1 according to this embodiment, for example, by being manufactured through the following first to third steps, it is inexpensively manufactured while suppressing an increase in manufacturing cost. In the following, the molded body 1, (1) A-pillar upper panel (front pillar), and (2) will be described when applied to the side members.
[0042]
　(1) A-pillar upper panel
　(1-1) First Step
　4 is an explanatory diagram showing a situation of manufacturing a molded body 1 to be used for A-pillar upper panel, Fig. 4 (a) first an isometric view showing a press die 20 used in the step, FIG. 4 (b) ~ FIG 4 (f) is, like viewed first intermediate molded article 27 produced in the first step from various directions it is the angular projection view.
[0043]
　In the first step, the tensile strength is of steel above 440 MPa (e.g. 980 MPa), the blank B of the elongated plate thickness of, for example 1.4 mm, the first blank holder 21, the first die 22, the first punch 23 and performing pad draw forming using a first pad 24. This pad drawing, may be provided distance block + 0.1 mm in the first blank holder 21.
[0044]
　The pad drawing elongated comprises a first portion 25 provided on one side in the width direction of the blank B, a second portion 26 connected to and first portion 25 provided on the other side in the width direction of the blank B the first intermediate article 27 is manufactured. The first portion 25 has a curved portion 8. Curved portion 8 is a portion that is convexly curved outward. In this embodiment, as the whole of the first portion 25 is a bending portion 8, the pad drawing is performed. In the present embodiment, curved when viewed from a direction (direction perpendicular to the surface or back surface of the second portion 26) perpendicular to the second portion 26, such that the first portion 25 and second portion 26 along each other is doing.
[0045]
　(1-2) Second Step
　Figure 5 is an explanatory diagram showing a situation of performing pad drawing in the second step, FIG. 5 (a) isometric showing a press die 30 used in the second step a diagram, FIG. 5 (b) ~ FIG 5 (f) is an isometric view of the second intermediate molded article 35 produced in the second step in various directions.
[0046]
　In the second step, a portion of the first portion 25 of the first intermediate molded article 27 by turning the pressing direction 90 degrees in the first step the press direction, while holding the second punch 31 and the second pad 33, performing pad drawing using a second die 32 and the second blank holder 34. The pad drawing, to produce a first flange 3, a first vertical wall portion 4, the second intermediate article 35 of elongated and a second portion 26 continuous with the first vertical wall portion 4.
[0047]
　(1-3) Third Step
　6 is an explanatory diagram showing a situation of performing pad bending in the third step, FIG. 6 (a) isometric showing a press die 40 used in the third step a diagram, FIG. 6 (b) ~ FIG 6 (g) is an isometric view looking moldings produced in the third step a (a-pillar upper panel) 1 from various directions.
[0048]
　In the third step, the pressing direction, the same direction as the first step to turn the pressing direction 90 degrees in the second step. Then, the pad bending using a third die 42 while pressing the portion in the third punch 41 and the third pad 43 in the width direction of the second portion 26 of the second intermediate product 35.
[0049]
　The second intermediate molded article 35 when the pad bending, when the occurrence of more than wrinkles or meat is concerned, in order to suppress the inflow of material may be subjected to pad drawing instead of the pad bending .
[0050]
　Thus, a first flange 3, a first vertical wall 4, a top plate portion 5, and the second vertical wall portion 6, and a second flange 7 is formed. In this way, the molded body according to an embodiment of the present invention (A-pillar upper panel) 1 is produced by press molding.
[0051]
　Figure 7 is a diagram showing the first to third step described above, the first intermediate product 27, the second intermediate article 35 and the molded body (A-pillar upper panel) 1 of the shape and sheet thickness reduction rate . The numbers in parentheses in FIG. 7 shows a thickness reduction rate (%) in the numbers indicated position. Incidentally, the plate thickness reduction rate shown in FIG. 7, the results obtained by finite element analysis. Specifically, performs forming analysis using a finite element analysis code of the dynamic explicit method, and analyzed the sheet thickness reduction rate after the molding. The analysis was applied to the material properties of the composite structure type steel sheet 980MPa grade.
[0052]
　As shown in FIG. 7, the above-described manner manufactured molded body (A-pillar upper panel) 1, a first flange 3 for curved along one another when viewed from the direction perpendicular to the top plate portion 5, the second It has a flange 7 and a body portion 100. The plate thickness reduction rate of the first intermediate molded article 27 is 6.0 to -2.6%, the thickness reduction rate of the second intermediate molded article 35 is 8.2 to -4.1%. Further, the thickness reduction rate of the molded product (A-pillar upper panel) 1 is 8.5 to -3.9%.
[0053]
　For comparison, the case of producing a molded article by a conventional method which deviates from the manufacturing condition defined in the present invention were also subjected to the same analysis. As a conventional method, a die, using a punch, and a mold having a blank holder (holder), the case of performing so-called draw forming for processing while sandwiching the workpiece by the die and the holder, die, punch, Roadai and using a mold having a top pad, while pressed against the punch above the pad material to be processed was analyzed, the case of so-called bending the bending by the die.
[0054]
　As a result, in the conventional method, it was found that it is impossible to perform processing of the inward flange stably. Further, the die shoulder was found that elongation and contraction deformation in the flange. Further, the thickness reduction rate in the flange portion has been found that there is a risk that be in the range of 25 to 20%, resulting cracking and excessive wrinkling. In contrast, according to the manufacturing method according to the embodiment of the present invention, as described above, it was possible to suppress the sheet thickness reduction rate in the range of 8.5 to -3.9%. That is, according to the first to third steps described above, without cracking and wrinkling, moldings (A-pillar upper panel) were found to 1 can be produced.
[0055]
　(2) side members
　(2-1) First Step
　8 is an explanatory diagram showing a situation of manufacturing a molded body 1 to be used for the side members, 8 (a) is a mold used in the first step showed 50, FIG. 8 (b) shows a mold 60 used in the second step, FIG. 8 (c) shows a mold 70 used in the third step.
[0056]
　Further, FIG. 9 (a) ~ FIG. 9 (c) is an isometric view of the molded body 1 manufactured by the first to third step from various directions. The top plate 5 of the molded body 1, beads 5a are formed.
[0057]
　Further, FIG. 10 is shown together with the molding conditions in the first to third steps, each portion of the sheet thickness reduction rate of the molded body 1 manufactured (%) and Y-direction movement amount of material in the molding (mm) it is an explanatory diagram. The numbers in parentheses in FIG. 10 shows a plate thickness reduction rate (%) or Y direction movement amount (mm) in the digit position indicated. The plate thickness reduction rate and the Y-direction movement amount is the result obtained by finite element analysis. Analysis conditions are the same as those of the aforementioned A-pillar upper panel.
[0058]
　As shown in FIG. 8 (a), in a first step, the tensile strength is of steel above 440 MPa (e.g. 980 MPa), the blank B of the elongated plate thickness of, for example 1.4 mm, the first punch 51, the performing pad draw forming using a first die 52, the first pad 53 and the first blank holder 54. In the pad draw forming may be arranged + 0.1 mm of distance blocks between the first blank holder 54 and the first die 52.
[0059]
　As shown in FIG. 10, the first step (1 step eyes), for example, the pad pressure of the first pad 53 (upper pad pressure) 50Tonf, set to the holder pressure of the first blank holder 54 20tonf It is.
[0060]
　Referring to FIG. 8 (b), by draw forming said pad, a first portion 25 provided on one side in the width direction of the blank B, provided on the other side in the width direction of the blank B and the first portion 25 the first intermediate article 27 of elongated and a second portion 26 is produced to lead to. In this embodiment, first portion 25 has a plurality of curved portions curved in different directions.
[0061]
　(2-2) Second step
　as shown in Figure 8 (b), in the second step, the first portion of the first intermediate molded article 27 to turn 90 degrees from the pressing direction in the first step the pressing direction 25 a portion of the second portion 26, while holding the second punch 61 and the second pad 63, performs the pad draw forming using a second die 62 and the second blank holder 64.
[0062]
　The pad drawing, for example, may be arranged + 0.1 mm of distance blocks between the second blank holder 64 and the second die 62. In the second step, for example, the pad pressure of the second pad 63 (upper pad pressure) in 50Tonf, holder pressure of the second blank holder 64 are respectively set to 20Tonf.
[0063]
　The pad drawing, to produce a first flange 3, a first vertical wall portion 4, the second intermediate article 35 of elongated and a second portion 26 continuous with the first vertical wall portion 4.
[0064]
　(2-3) Third Step
　As shown in Figure 8 (c), in a third step, the pressing direction, the same direction as the first step to turn the pressing direction 90 degrees in the second step. Then, bending the pad using a third die 72 while pressing the portion in the third punch 71 and the third pad 73 in the width direction of the second portion 26 of the second intermediate molded article 35 molded, or, a portion said first 3 performs pads drawing or pads bending using a third die 72 and third blank holder while pressing punch 71 and the third pad 73 (not shown). FIG. 8 (c) shows the case of a pad bending.
[0065]
　If the occurrence of more than wrinkles or meat to a second intermediate molded article 35 is concerned when the pad bending, for example, the pad drawing is performed.
[0066]
　Thus, a first flange 3, a first vertical wall 4, a top plate portion 5, and the second vertical wall portion 6, and a second flange 7 is formed. In this way, the molded body 1 having an outer shape as shown in FIG. 9 (a) ~ FIG 9 (c) is produced by press molding.
[0067]
　As shown in FIG. 9 (a) ~ FIG 9 (c), the molded body 1 manufactured as described above has a curved portion 3a, 7a. That is, the molded body 1, first flange 3 for curved along one another when viewed from the direction perpendicular to the top plate 5, and a second flange 7 and the body portion 100. Further, as shown in FIG. 10, the plate thickness reduction rate of the molded body 1 is 13.8 ~ -10.6%, compared to the conventional method described above, it is possible to reduce the range of the plate thickness reduction rate ing. This thickness reduction ratio, without cracking and wrinkles in the first through third steps described above, it can be seen that can be produced a molded body 1.
[0068]
(Effect of the molded body according to the present embodiment)
　compared to the molded article body part is shaped in a straight line, in the molded body having a shape in which the body portion is curved, when a load is applied in the longitudinal direction of the molded body (when the longitudinal compressive stress occurs), easily bent. Specifically, the molded body is a direction to reduce the curvature radius of the curved portion (hereinafter referred to as a bending direction.) Easily bent to. Further, in the molded body having a shape in which the body portion is curved, as the curvature radius of the curved portion is small, and decreases the bending deformation resistance at the time of bending the bending direction. However, the molded body 1 according to the present embodiment, since the curve direction first flange 3 and the second flange 7 is provided, it is possible to increase the bending deformation resistance molded body 1. In particular, in the present embodiment, since the inward flange (first flange 3) is provided in the molded body 1, the second moment of the molded body 1 can be increased, the flexural rigidity in the elastic deformation range it is possible to increase. Also, the applied load of the bending direction in the molded body 1 is formed body 1 when plastically deformed in the bending direction, the first flange 3, it is possible to generate a tensile stress in the longitudinal direction. Thus, it is possible to suppress the local bending deformation, the load in the molding body 1 can be received stably. That is, it is possible to increase the energy absorption by plastic deformation. These results, in the molding body 1, sufficient bending rigidity is obtained.
[0069]
　Incidentally, the molded body 1 according to this embodiment, since it has the characteristics as described above, for example, in the vehicle body, at the site where it is necessary to receive the load in the bending direction of the molded body 1 can be suitably used.
Industrial Applicability
[0070]
　According to the present invention, it is possible to obtain a molded body and the vehicle body structural member having bending excellent rigidity against deformation.
DESCRIPTION OF SYMBOLS
[0071]
1 molded body
2 structural member
3 first flange
3a curved portion
4 first vertical wall
5 top plate
6 second vertical wall portion
7 and the second flange portion
7a curved portion

The scope of the claims
[Requested item 1]Has an open cross section, the top plate portion, a first vertical wall portion provided continuously to one end portion in the width direction of the top plate portion, and continuously to the other end portion in the width direction of the top plate portion is provided is a body portion having a second vertical wall portion,
　wherein the said top plate in the first vertical wall portion and a first flange provided continuously at the opposite end,
　the top in the second vertical wall portion and a second flange which is provided continuously to the end opposite to the plate portion, the tensile strength is a molded article comprising the above steel 440 MPa,
　at least one of said first flange and said second flange one flange extends towards the other flange of said first flange and said second flange from said first vertical wall portion and the second vertical wall portion,
　said body portion and said at least one flange, or a direction orthogonal to the top plate portion To curved along each other when viewed, molded body.
[Requested item 2]
　Wherein the other flange of the first flange and the second flange is curved when viewed from the direction perpendicular to the top plate along the body portion, the molded body according to claim 1.
[Requested item 3]
　Comprising a molded body according to claim 1 or 2, and a joint member joined to the first flange and the second flange so as to connect the second flange and the first flange of the molded body , the structural member.
[Requested item 4]
　The joining member is a molded body according to claim 1 or 2,
　is a first flange of the first flange and the other of the shaped body of one of the shaped body is bonded, one of the green body wherein a second said second flange of the flange and the other of the compact is bonded, structural member according to claim 3.
[Requested item 5]
　It said structural member is a vehicle body of the front pillar, roof rail, a front side member, a side sill, rear side member is a crush box or crush can, A structure according to claim 3 or 4.
[Requested item 6]
　Having first to third steps below, process for producing a molded article according to claim 1 or 2,
　the first step: the elongated blank tensile strength becomes the above steel 440 MPa, a first punch, a first die, by performing the pad draw forming using a first pad and a first blank holder, on the other side of the first portion to the width direction of the blank having a and curved portions provided on one side in the width direction of the blank provided and producing a first intermediate product of a long and a second portion connected to the first portion,
　the second step: the by turning 90 degrees the press direction from the pressing direction in the first step the a portion of the first portion of the first intermediate molded article, by performing pad drawing using a second die and the second blank holder while holding the second punch and a second pad, the first furan Producing the second intermediate molded article of elongated and a second portion continuous with the first vertical wall portion and the first vertical wall portion and,
　third step: a pressing direction, pressing at the second step as the same direction as the first step to turn 90 degrees from the direction, the pad using a third die pressing the part with the third punch and third pad in the width direction of the second portion of the second intermediate molded article by performing the bending, or by performing pad draw forming using a third die and the third blank holder while holding a part the third punch and third pads, said first vertical wall portion continuous and the top plate portion which is formed with the second vertical wall portion continuous to the top plate portion and a second flange that is continuous with the second vertical wall portion.
[Requested item 7]
　Moldings produced by the production method described in claim 6.