JP2013086591A - Vehicle component having closed cross section space and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle component which has a closed cross section space of which the expansion and contraction are suppressed though it is constituted of one metal plate and has curved surfaces being longitudinally convexly radiused and longitudinally concavely radiused respectively.SOLUTION: The vehicle component includes a sidewall 13d which has a bead 13e whose bead depth is gradually reduced as approaching both longitudinal-direction end parts and is longitudinally concavely radiused. The sidewall 13d includes: a first curved surface part 13c which is bent and is longitudinally concavely radiused; a second curved surface part 13b which is formed by being longitudinally bent into a circular arcuate shape with respect to the first curved surface part 13c and is longitudinally convexly radiused; and a third curved surface part 13h of which the first side end side of the vehicle component is bent in the circular arcuate shape longitudinally with respect to the second curved surface part 13b and which is longitudinally concavely radiused. A fourth curved surface part 13g which is longitudinally convexly radiused with respect to the third curved surface part 13h is bent, and a second side end of the vehicle component is bent with respect to the fourth curved surface part 13g.

Description

  The present invention relates to a vehicle component having a closed cross-sectional space and a method for manufacturing the vehicle component.

  Vehicle parts having a closed cross-sectional structure are often used, for example, as pillar components that support a roof panel, front headers, rear headers, and the like. Generally, the closed cross-sectional structure is configured by welding together flange portions provided on the side portions of a plurality of metal plates by combining a plurality of metal plates press-formed into a predetermined shape. ing. And if these members are pillar constituent members, they are curved so as to have a convex R outwardly of the vehicle in the longitudinal direction (Patent Document 1). Further, in the case of a front header or rear header (Patent Document 2), the upper surface serving as a surface for supporting the roof panel is curved so as to have a convex R.

  Conventionally, many vehicle parts having a closed cross-sectional structure as described above are formed from a plurality of metal plates, but there is also a demand to form a closed cross-sectional structure from a single metal plate in order to reduce the number of parts. .

  In Patent Document 3, when a straight closed cross-sectional structure is manufactured from one metal plate (FIGS. 1 to 4 of Patent Document 3), a closed cross-sectional structure curved in the longitudinal direction from one metal plate (Patent Document 3). 3 and FIG. 12 are manufactured.

Japanese Patent No. 4213115 JP 2009-208537 A Japanese Patent Laying-Open No. 2006-116552 (FIGS. 3, 4, 11, and 12)

However, the closed cross-sectional structure that is manufactured by the manufacturing method of Patent Document 3 and has a curved surface partially convex R is not preferable because large elongation and contraction occur in the curved portion.
An object of the present invention is to provide a vehicle component having a closed cross-sectional space in which expansion and contraction are suppressed despite having curved surfaces that are formed of a single metal plate and have convex R and concave R in the longitudinal direction. Is to provide.

  Another object of the present invention is to provide a method of manufacturing a vehicle component having a closed cross-sectional space having a convex R and a concave R in the longitudinal direction while suppressing expansion and contraction of the metal plate. is there.

  In order to solve the above problems, the invention according to claim 1 is formed by bending a single metal plate and connecting the first side end and the second side end respectively positioned in the short direction. Side wall which is a vehicle part having a closed cross-sectional space and is recessed inwardly in a closed cross-section and has a bead whose depth gradually decreases toward both ends in the longitudinal direction and has a concave R in the longitudinal direction And having a first bent portion and a second bent portion formed in an arc shape in the longitudinal direction on both side edges located in the short direction of the side wall, and the first bent portion A first curved surface portion that is bent in the longitudinal direction and has a concave R in the longitudinal direction, and is bent at a third folded portion that is formed in an arc shape in the longitudinal direction with respect to the first curved surface portion. It has a second curved surface portion that becomes convex R, and is formed in an arc shape in the longitudinal direction with respect to the second curved surface portion. The first bent side is bent at the fourth bent portion, the third bent portion is bent at the second bent portion, and has a concave R in the longitudinal direction. On the other hand, the fourth curved surface portion which is bent at the fifth bent portion formed in an arc shape in the longitudinal direction and becomes convex R in the longitudinal direction is bent, and the arc shape in the longitudinal direction with respect to the fourth curved surface portion. The gist of the present invention is a vehicle component having a closed cross-sectional space, wherein the second side end is bent at a sixth bent portion formed in the above.

According to a second aspect of the present invention, in the first aspect, the first side end and the second side end each have a flange portion, and both the flange portions are connected to each other.
The invention of claim 3 is characterized in that, in claim 1 or claim 2, the vehicle component is used for a front pillar.

  According to a fourth aspect of the present invention, there is provided a method of manufacturing a vehicle component having a closed cross-sectional space, which is bent by a single metal plate and has a first side end and a second side end that are respectively positioned in the lateral direction connected to each other. The gist of the present invention is a method for manufacturing a vehicle component, characterized by comprising the following steps.

<First step>
A central portion extending in the longitudinal direction of the metal plate is bent at an arc-shaped first bent portion and an arc-shaped second bent portion, so that the width of the central portion in the longitudinal direction is wide and at both ends in the longitudinal direction. Concave grooves whose widths become narrower toward each other are drawn, and a first curved surface portion having a concave R in the longitudinal direction is formed with respect to a portion connected to the concave groove via a first bent portion, A second curved surface portion having a convex R in the longitudinal direction is formed by mountain-folding the curved surface portion in the longitudinal direction at the arc-shaped third bent portion in the longitudinal direction. On the other hand, the first side end is formed by mountain-folding at the arcuate fourth bent portion in the longitudinal direction, and on the other hand, the portion connected to the concave groove via the second bent portion On the other hand, a third curved surface portion having a concave R in the longitudinal direction is formed, and the concave groove is formed by a fifth bent portion having an arc shape in the longitudinal direction with respect to the third curved surface portion. By forming a fourth curved surface portion that has a convex R in the longitudinal direction by folding in the mountain direction, and by folding the mountain at the sixth curved portion that is arcuate in the longitudinal direction with respect to the fourth curved surface portion, A drawing step for forming the second side end.

<Second step>
A step of forming a bead in which the concave groove is press-molded with a cushion and a punch, and the bead depth is deepened toward the center in the longitudinal direction, and the bead depth is gradually decreased toward both ends in the longitudinal direction.

<Third step>
In a state where the shape of the bead is held by the cushion and the punch, the first curved surface portion is rotated around the first bent portion and the third curved surface portion is rotated around the second bent portion. A bending step of bringing the side end and the second side end closer.

<4th process>
A bending step of rotating the first curved surface portion around the first bent portion and the third curved surface portion around the second bent portion to contact the first side end and the second side end f).

  According to a fifth aspect of the present invention, in the fourth aspect, in the first step, the first side end and the second side end are bent at the first side end, respectively, and in the fourth step, the first side end, And the flange parts of a 2nd side end are contacted in the shape of a palm.

  The invention of claim 6 is characterized in that, in claim 4 or 5, the vehicle component is used for a front pillar.

  According to the invention of claim 1, it has a closed cross-sectional space in which expansion and contraction are suppressed despite having a curved surface which is formed of a single metal plate and has a convex R and a concave R in the longitudinal direction. Vehicle parts can be provided. In addition, by forming (that is, integrating) the closed cross-section space with a single plate, the plate thickness can be reduced while improving the strength and rigidity, and as a result, the vehicle parts can be reduced in weight.

  According to the invention of claim 2, the first side end and the second side end each have a flange portion, and the both flange portions are connected to each other so that the flange portions can be easily connected to each other. Can do.

  According to the invention of claim 3, in the vehicle part used for the front pillar, the effect of claim 1 or claim 2 can be easily realized. Furthermore, by adopting the pillar, the field of view can be expanded while maintaining the strength and rigidity (thinning the cross section).

  According to the invention of claim 4, the closed cross-sectional space in which the expansion and contraction are suppressed despite the fact that each of the metal plates has curved surfaces that are convex R and concave R in the longitudinal direction. The vehicle parts which have can be provided.

According to the invention of claim 5, it is possible to easily obtain a vehicle component in which the flange portions are in contact with each other in the shape of a palm.
According to invention of Claim 6, the manufacturing method of the vehicle components used for a front pillar can be provided.

Sectional drawing seen from the axial direction (longitudinal direction) of one Embodiment which actualized the vehicle component of this invention to the front pillar structural member. The schematic side view which shows the vehicle body of a motor vehicle. (A) is a perspective view of a vehicle component, (b) is a perspective view of a vehicle component of another embodiment. (A), (b) is explanatory drawing of the principle of bending of vehicle components. Explanatory drawing of the manufacturing method of vehicle components. (A)-(d) is explanatory drawing of the manufacturing method of a vehicle component. (A) is sectional drawing of the center part of the longitudinal direction of the vehicle components in a 1st process, (b) is sectional drawing of the edge part of the longitudinal direction of the vehicle components in a 1st process. (A) is sectional drawing of the center part of the longitudinal direction of the vehicle components in a 1st process, (b) is sectional drawing of the edge part of the longitudinal direction of the vehicle components in a 1st process. (A) is sectional drawing of the center part of the longitudinal direction of the vehicle components in a 1st process, (b) is sectional drawing of the edge part of the longitudinal direction of the vehicle components in a 1st process. (A) is sectional drawing of the center part of the longitudinal direction of the vehicle components in a 2nd process, (b) is sectional drawing of the edge part of the longitudinal direction of the vehicle components in a 2nd process. (A) is sectional drawing of the center part of the longitudinal direction of the vehicle components in a 2nd process, (b) is sectional drawing of the edge part of the longitudinal direction of the vehicle components in a 2nd process. (A) is sectional drawing of the center part of the longitudinal direction of the vehicle components in a 3rd process, (b) is sectional drawing of the edge part of the longitudinal direction of the vehicle components in a 2nd process. (A) is sectional drawing of the center part of the longitudinal direction of the vehicle components in a 4th process, (b) is sectional drawing of the edge part of the longitudinal direction of the vehicle components in a 3rd process. (A) is sectional drawing of the center part of the longitudinal direction of the vehicle components in a 4th process, (b) is sectional drawing of the edge part of the longitudinal direction of the vehicle components in a 3rd process. Sectional drawing of vehicle components.

  Hereinafter, an embodiment in which a vehicle component of the present invention is embodied as a front pillar constituent member used for a front pillar will be described with reference to FIGS. In FIG. 1, “front” of the arrow indicates the front side of the vehicle, and “outside” indicates the outer side of the vehicle.

  As shown in FIG. 2, a pair of left and right roof side rails 6 are arranged along the vehicle longitudinal direction at both ends in the vehicle width direction at the upper part of the vehicle body 5 of the automobile. A front roof rail 7 </ b> A is disposed at the front end of the roof side rail 6. A rear roof rail 7 </ b> B is disposed at the rear end portion of the roof side rail 6. An upper end portion of the front pillar 10 is connected to the front end portion of the roof side rail 6. The upper end portion of the rear pillar 8 is connected to the rear end portion of the roof side rail 6, and the upper end portion of the center pillar 9 is connected to the middle portion of the roof side rail 6 in the vehicle longitudinal direction. FIG. 1 shows a cross-sectional shape (A-A cross section) of the central portion viewed from the axial direction (longitudinal direction) of the front pillar 10. In the present embodiment, the longitudinal direction is the axial direction of the front pillar 10 and coincides with the longitudinal direction of the metal plate described later. The short direction is a direction orthogonal to the long direction.

  As shown in FIG. 1, the front pillar 10 is interposed between a pillar outer panel 11 that constitutes the vehicle body outer side portion, a pillar inner panel 12 that constitutes the vehicle body inner side portion of the front pillar 10, and the pillar outer panel 11 and the pillar inner panel 12. The front pillar component member 13 is provided.

  The pillar outer panel 11 has a flange portion 11a and a flange portion 11b at both front and rear portions, and an intermediate portion 11c is formed so as to protrude in a cross-sectional protruding shape (in the present embodiment, a U-shape) outward from the passenger compartment. In the present embodiment, the intermediate portion 11c is formed to protrude in a U-shape, but is not limited to a U-shape. Further, a step portion 11e is formed on the rear side wall 11d from the intermediate portion 11c toward the outside.

(About the front pillar component 13)
As shown in FIGS. 1 and 3A, the front pillar component member 13 has a first flange portion 13a and a second flange portion 13f at both ends in the short direction of a single metal plate, and the first flange portion. 13a and the 2nd flange part 13f are mutually connected, and it is formed in the hollow shape so that it may have the closed cross-section space 14. As shown in FIG. That is, the 1st flange part 13a and the 2nd flange part 13f are connected by spot welding in the state contact | abutted in the palm shape.

  Further, as shown in FIG. 1, the front pillar constituting member 13 is arranged in order between the first flange portion 13 a and the second flange portion 13 f in the portion excluding both ends in the longitudinal direction. The second curved surface portion 13b, the first curved surface portion 13c, the side wall 13d, the bead 13e, the third curved surface portion 13h, the fourth curved surface portion 13g, and the second connecting portion 13m are formed. In the present embodiment, the side wall 13 d has a concave groove 60 extending in the longitudinal direction, and a bead 13 e is formed in the concave groove 60.

A closed cross-sectional space 14 is formed as shown in FIG. 1 by being surrounded by the in-focus portion of the first flange portion 13a and the second flange portion 13f and the respective portions.
If the structure of the front pillar structural member 13 is further explained in detail, as shown in FIGS. 3A and 6D, the side wall 13d is formed with the same width over the entire length. The side wall 13d has a concave surface that becomes a concave R toward the closed cross-section space 14 in the longitudinal direction. The side wall 13d is not limited to substantially the same width, and is formed such that the width in the short direction is widened at the center in the longitudinal direction and the width in the short direction is shortened toward both ends in the longitudinal direction. May be.

  A bead 13e is formed along the longitudinal direction at a portion of the side wall 13d excluding both ends in the longitudinal direction so as to be located at the center in the lateral direction. As shown in FIGS. 1, 3A, and 6D, the bead 13e is recessed toward the inside of the closed section (that is, the inside of the closed section space 14). That is, the bead 13 e protrudes toward the closed cross-sectional space 14. The bead 13e is formed so that the bead depth at the center portion in the longitudinal direction is the deepest, and the bead depth is gradually decreased toward both ends in the longitudinal direction. In other words, the bead 13e is formed such that the height of the bead at the center in the longitudinal direction (that is, the amount protruding from the inner surface of the side wall 13d into the closed cross-section space 14) is the highest, and both ends in the longitudinal direction. It is formed so that the bead height gradually decreases toward the part.

  Furthermore, in this embodiment, the bead 13e is formed so that the bead width at the center portion in the longitudinal direction is the widest, and the bead width is gradually reduced toward both ends in the longitudinal direction.

  The bead width of the bead 13e is not limited to be as wide as the central portion in the longitudinal direction. The bead width is the same over the entire length of the bead, and only the bead height is formed to be higher in the central portion in the longitudinal direction. It may be.

  In the present embodiment, the bead 13e has a shorter width in the center portion in the longitudinal direction (a region in the vicinity of the line AA in FIG. 2) and a shorter width toward both ends in the longitudinal direction. The bead width in the hand direction is shortened, and the bead depth (bead height) disappears at both ends, but is not limited thereto. For example, the width in the short direction is widened in the central portion in the long direction (the region in the vicinity of the line AA in FIG. 2) and the width in the short direction is shortened toward both ends in the long direction, The bead 13e may be left slightly at both ends without disappearing.

  The bead height is increased at the longitudinal center and decreased at both longitudinal ends, and the bead width is widened at the longitudinal central portion and narrowed at both longitudinal ends, or By increasing the bead height at the longitudinal central portion and lowering at both longitudinal end portions, the connection region N that becomes a surplus when the front pillar constituting member 13 is formed in the closed cross-sectional structure can be absorbed.

  As shown in FIGS. 3 (a) and 6 (d), both side edges in the lateral direction (width direction) of the side wall 13d are folded in a mountain fold, and the first fold is extended in an arc shape in the longitudinal direction. A bent portion 13q and a second bent portion 13u are provided. The first curved surface portion 13c and the third curved surface portion 13h are connected to the side wall 13d via the first bent portion 13q and the second bent portion 13u, respectively.

  The first curved surface portion 13c is formed to have the same width in the longitudinal direction, and has a concave surface that becomes a concave R toward the closed cross-section space 14 in the longitudinal direction. In the present embodiment, the first curved surface portion 13c is formed to have the same width in the longitudinal direction, but is not limited thereto. For example, the first curved surface portion 13c is formed so that the width gradually increases or decreases in the longitudinal direction from one end to the other end, or from the center to both ends. May be.

  In the 1st curved surface part 13c, the 2nd curved surface part 13b is mountain-folded and connected with the side edge on the opposite side to the 1st bent part 13q in the 3rd bent part 13r. The third bent portion 13r is formed to extend in an arc shape in the longitudinal direction.

  The second curved surface portion 13b is formed to have the same width in the longitudinal direction, and has a convex surface that forms a convex R on the opposite side from the closed section space 14 side in the longitudinal direction. In the present embodiment, the second curved surface portion 13b is formed to have the same width in the longitudinal direction, but is not limited thereto. For example, the second curved surface portion 13b is formed so that the width gradually increases or decreases in the longitudinal direction from one end to the other end or from the center to both ends. May be.

  In the 2nd curved surface part 13b, the 1st connection part 13j is mountain-folded and connected with the side edge on the opposite side to the 3rd bending part 13r in the 4th bending part 13s. The fourth bent portion 13s is formed to extend in an arc shape in the longitudinal direction. The first connecting portion 13j is formed to have the same width or substantially the same width in the longitudinal direction.

  As shown in FIG. 1, the 1st flange part 13a is valley-folded and connected with respect to the 1st connection part 13j by the 7th bending part 13t. The first flange portion 13a is formed to have the same width or substantially the same width in the longitudinal direction. In this embodiment, the 1st side part is comprised by the 1st connection part 13j and the 1st flange part 13a.

  As shown in FIG. 6A, the second bent portion 13u has a longer distance between the central portions in the longitudinal direction than the first bent portion 13q, and narrows toward each other in the longitudinal direction. It is formed in an arc shape. As shown in FIG. 6A, the third curved surface portion 13h is formed to have the same width in the longitudinal direction, and the closed cross-sectional space in the longitudinal direction as shown in FIG. 6D. It has a concave surface that becomes a concave R toward the 14th side. In the present embodiment, the third curved surface portion 13h is formed to have the same width in the longitudinal direction, but is not limited thereto. For example, the third curved surface portion 13h gradually increases in width in the longitudinal direction from one end to the other end, or from the central portion to both ends so as to match the first curved surface portion 13c. You may form so that it may become wide or narrow.

  A fourth curved surface portion 13g is connected to the third curved surface portion 13h by being folded at a fifth bent portion 13v. The fifth bent portion 13v is formed to extend in an arc shape in the longitudinal direction. The fourth curved surface portion 13g is formed to have the same width in the longitudinal direction, and has a convex surface that forms a convex R on the opposite side to the closed cross-section space 14 side in the longitudinal direction. In the present embodiment, the fourth curved surface portion 13g is formed to have the same width in the longitudinal direction, but is not limited thereto. For example, the fourth curved surface portion 13g gradually increases in width in the longitudinal direction from one end to the other end, or from the central portion to both ends so as to match the second curved surface portion 13b. You may form so that it may become wide or narrow.

  The second connecting portion 13m is connected to the fourth curved surface portion 13g by being folded at the sixth bent portion 13w. The sixth bent portion 13w is formed to extend in an arc shape in the longitudinal direction. The second connecting portion 13m is formed to have the same width or substantially the same width in the longitudinal direction. The second flange portion 13f is connected to the second connecting portion 13m by being valley-folded at the eighth bent portion 13x. The second flange portion 13f is formed to have the same width or substantially the same width in the longitudinal direction.

In the present embodiment, the second side end is configured by the second connecting portion 13m and the second flange portion 13f.
As shown in FIG. 1, the 2nd curved surface part 13b of the front pillar structural member 13 is arrange | positioned so that it may face the vehicle diagonally front. The flange portion 11a of the pillar outer panel 11 is series-welded to the second curved surface portion 13b. Further, a windshield glass 17 is bonded to the flange portion 11 a with an adhesive 18. Here, the second curved surface portion 13 b corresponds to a support surface that supports the windshield glass 17. Both ends of the windshield glass 17 in the left and right width directions are covered with moldings 20 fixed to the flange portion 11 a of the pillar outer panel 11.

  As shown in FIG. 1, the first flange portion 13 a and the second flange portion 13 f of the front pillar component member 13 are positioned so as to protrude outward from the passenger compartment. As shown in FIG. 1, the pillar inner panel 12 includes a front flange 12a, an intermediate portion 12c bent in a V-shaped cross section toward the side of the vehicle, and a rear flange 12b. The flange 12 a is series welded to the side wall 13 d of the front pillar component 13. This series welding is performed simultaneously with the series welding of the flange portion 11a of the pillar outer panel 11 and the second curved surface portion 13b of the front pillar constituting member 13. The flange 12 b is spot welded to the flange portion 11 b of the pillar outer panel 11.

  A pillar garnish 15 is disposed in the vehicle interior of the pillar inner panel 12, and the vehicle interior side portion of the front pillar 10 is covered. That is, as shown in FIG. 1, the side wall 13 d side of the front pillar component member 13 is located from the front end of the pillar garnish 15 so as not to be positioned at the front end of the pillar garnish 15 (the end located proximal to the windshield glass 17). The pillar garnish 15 is covered at a spaced position. As shown in FIG. 1, an opening weather strip 16 is attached to the flange portion 11b and the flange 12b, and can be brought into close contact with a front side door (not shown).

(1. Manufacturing method and action)
Next, the manufacturing method of the front pillar component member 13 configured as described above and the operation of the front pillar component member 13 will be described.

(2. Manufacturing method of vehicle parts (front pillar components))
First, the principle of the manufacturing method of the vehicle component (front pillar component member 13) of this embodiment will be described with reference to FIGS. 4 (a) and 4 (b).

(2.1. Principle)
As shown in FIG. 4A, when one flat metal plate 350 is bent upward (Z direction) with an arcuate curve 351 extending in the longitudinal direction (X direction) as a boundary, FIG. 4B is obtained. As shown, plate portions 352 and 353 having a three-dimensional shape surface, in which the metal plate 350 is not stretched or contracted, are formed. In FIGS. 4A and 4B, the thickness of the metal plate 350 is deformed for convenience of explanation. In FIG. 4A, the edges of both side portions 355 and 356 in the short direction of the metal plate 350 (Y direction in FIG. 4A) are formed in parallel with the curve 351.

  In FIG. 4B, the plate portion 352 positioned at the lower portion has both ends in the longitudinal direction longer than the center portion when viewed from the side view direction in FIG. 4B (the anti-Y direction in FIG. 4B). It has a curved surface (three-dimensional shape surface) that is displaced upward (Z direction side) and has a convex surface on the lower surface.

  Also, the plate portion 353 formed by bending so as to stand up with respect to the plate portion 352 is centered at both ends in the longitudinal direction when viewed from the plan view direction (anti-Z direction) of FIG. In FIG. 4B, the curved surface (three-dimensional shape surface) is a concave surface that is displaced in the anti-Y direction side and is directed in the anti-Y direction. In this case, when the metal plate (that is, the material) is not stretched or contracted, the curvature radii of the curved surfaces of the plate portions 352 and 353 are the same.

  Here, if the outer edges of both side portions 355 and 356 along the longitudinal direction of the metal plate 350 are formed so as to be parallel to the curve 351, the plate portion 352 shown in FIG. Have the same width. Similarly, the plate portion 353 has the same width along the longitudinal direction. Accordingly, the outer edge of the plate portion 353 has an arcuate recess R in which the central portion in the longitudinal direction is recessed in the Y direction from both ends, while the central portion in the longitudinal direction of the plate portion 352 is more than the both ends. It has an arcuate convex R surface protruding in the Y direction.

  In FIG. 4A, L1 indicates the width of the curve 351 and the side portion 355 located in the anti-Y direction, and L2 indicates the width of the curve 351 and the side portion 356 located in the Y direction. Note that L1 and L2 may be the same value or not the same value.

The vehicle component manufacturing method of the present invention utilizes the above principle.
Here, when the plate portion 352 of FIG. 4B showing the principle is P (having a convex R) and the plate portion 353 is Q (having a concave R), the front pillar shown in FIG. The correspondence between the constituent members 13 will be described with reference to FIG. In FIG. 15, the cross section of the front pillar constituting member 13 is shown as a symmetrical shape for convenience of explanation.

  In FIG. 15, a solid line indicates a cross section at the center portion in the longitudinal direction, and a two-dot chain line indicates a cross section at both end portions in the longitudinal direction. In FIG. 15, the first flange portion 13a, the second curved surface portion 13b, the first curved surface portion 13c, the side wall 13d, the second flange portion 13f, the fourth curved surface portion 13g, and the third curved surface portion 13h are respectively represented by B to D. , And G and H are attached.

Here, the relationship between P (having the convex R) and Q (having the concave R) in FIG. 4B is the second curved surface portion 13b (B) and the first curved surface portion 13c (in FIG. 15). C).
That is, in FIG. 15, C is set by rotating B by 90 degrees clockwise. In addition, H and G are set in parallel with B and C, respectively. Further, when the side wall 13d (D) is formed as shown by the two-dot chain line in FIG. 15, the second curved surface portion 13b (B surface) is 45 degrees as shown in FIG. Set by rotating clockwise.

  Thus, by setting, a convex R is obtained in B, and a concave R is obtained in C. In D, a concave R is obtained. In G, a convex R is obtained, and in H, a concave R is obtained. In order to have a relationship with the adjacent surfaces of the concave R or convex R of B to D, G, and H, the bent portions that define B to D, G, and H each extend in an arc shape in the longitudinal direction. Is formed.

  In the above description, for convenience of explanation, the description has been made with a rotation of 90 degrees or 45 degrees. However, the present invention is not limited to this angle, and is a value around 90 degrees or an approximate value around 45 degrees. Is also possible. Further, for convenience of explanation, in FIG. 15, the shape is symmetrical, but it may be asymmetrical.

(2.2 Manufacturing Method of Front Pillar Component 13)
Next, a specific method for manufacturing the front pillar constituting member 13 will be described with reference to FIGS.

  The metal plate 400 is formed in a shape in which a pair of metal plates 350 face each other in opposite directions and are connected via a connection region N at the center in the longitudinal direction of the side portion 355, and a virtual reference passing through the connection region N It has a shape that is line symmetric with respect to the line O as a center line. Such a metal plate 400 is formed by stamping or the like.

  In FIG. 5, for convenience of explanation, A and B symbols are added to the same symbols used in FIG. 4A to the respective parts corresponding to the configurations described in FIG. 4A and FIG. 4B. To do. Further, in FIG. 5, for convenience of explanation, the connection region N is shown hatched. The connection region N is formed with a wide lateral direction (Y direction) at the center in the longitudinal direction (X direction), and the width gradually decreases toward both ends in the longitudinal direction.

  The connection region N is a portion that becomes extra when the front pillar constituting member 13 has a closed cross-sectional structure. The connection region N, which becomes a hindrance when the closed cross-section structure is formed in a warped state, is absorbed by a bead formed in a process described later.

  Accordingly, in the side portion 355A, the central portion in the longitudinal direction has a convex R in the Y direction rather than both end portions. In the present embodiment, the outer edges on the Y direction side of both side portions 355A and 356A along the longitudinal direction of the metal plate portion 350A are formed to be parallel to the curve 351A.

  Further, in the side portion 355B, the central portion in the longitudinal direction is convex R in the anti-Y direction from both end portions. The outer edges on the opposite Y direction sides of both side portions 355B and 356B along the longitudinal direction of the metal plate portion 350B are formed to be parallel to the curve 351B. The curvature radii of the curves 351A and 351B are the same.

  In FIG. 5, L3 indicates the width of the side portion 355A located on the anti-Y direction side with respect to the curve 351A, and L4 indicates the width of the side portion 356A located on the Y direction side with respect to the curve 351A. L3 and L4 may be the same value or different values. L5 represents the width of the side portion 355B located on the Y direction side with respect to the curve 351B, and L6 represents the width of the side portion 356B located on the side opposite to the Y direction with respect to the curve 351B. L5 and L6 may be the same value or different values. The width L3 and the width L5 are preferably equal or approximately equal. The width L4 and the width L6 are preferably equal or substantially equal.

The metal plate 400 formed as described above is placed on the lower mold KA2 shown in FIGS. 7 (a) and 7 (b).
The upper mold KA1 includes a punch KA1a and a pair of sub molds KA1b and KA1c arranged on both sides of the punch KA1a in the short direction. 7A, 8 </ b> A, and 9 </ b> A are cross-sectional views in the central portion in the longitudinal direction of the metal plate 400 during manufacturing. 7B, 8B, and 9B are cross-sectional views at one end of the metal plate 400 in the longitudinal direction.

(First step)
The punch KA1a is moved to the bottom dead center with respect to the connection region N of the metal plate 400, and the reference that is a straight line as shown in FIGS. 8A and 8B by the punch KA1a and the lower mold KA2. A concave groove 60 is formed in a U shape or a V shape along the line O (see FIG. 5). When forming the aperture, the portion where the concave groove 60 is formed is a concave portion in the longitudinal direction of the metal plate 400 by the processed surface 100 of the punch KA1a and the processed surface 150 of the lower mold KA2 that form the concave groove 60. R is formed. In the present embodiment, it is assumed that the longitudinal direction of each mold used in the first step to the fourth step coincides with the longitudinal direction of the first formed body 400A.

  Further, in the present embodiment, the concave groove 60 in the central portion in the longitudinal direction is formed in a U-shaped cross section by the machining surface 100 of the punch KA1a and the machining surface 150 of the lower mold KA2, and the end side in the longitudinal direction The concave groove 60 is formed in a V-shaped cross section. Furthermore, as shown in FIG. 6A, the groove 60 is formed so that the central portion has a wide groove width in the longitudinal direction of the metal plate 400 and the groove width at the end portion in the longitudinal direction is narrow. The In the concave groove 60, in the present embodiment, the groove depth is the same at the central portion and both ends in the longitudinal direction, but the central portion side may be formed deeper than the end portion side.

  Here, as shown in FIG. 6A, the first bent portion 13q and the second bent portion 13u face in opposite directions with the connection region N in between, and the central portions in the longitudinal direction are wide with each other at both ends. It is formed in a circular arc shape so that it becomes narrow mutually as it goes.

  Simultaneously with the formation of the concave groove 60, as shown in FIGS. 8 (a) and 8 (b), the processed surface 102 of the punch KA1a and the processed surface 152 of the lower mold KA2 are separated from the first bent portion 13q. The plate portion (including the region that later becomes the first curved surface portion 13 c) between the side edges on the Y direction side becomes a concave R in the longitudinal direction of the metal plate 400. Further, the plate portion (including the region that will later become the third curved surface portion 13h) from the second bent portion 13u to the side edge on the side opposite to the Y direction includes the processed surface 104 of the punch KA1a and the processed surface of the lower mold KA2. 154 becomes a concave R in the longitudinal direction of the metal plate 400.

  Next, as shown in FIGS. 9A and 9B, the sub-molds KA1b and KA1c are moved to the bottom dead center, and the sub-molds KA1b and KA1c and the lower mold KA2 are used to move the fifth bent portion 13v. , The sixth bent portion 13w, the eighth bent portion 13x, the third bent portion 13r, the fourth bent portion 13s, and the seventh bent portion 13t. The bending angle of the third bent portion 13r and the fifth bent portion 13v formed in the first step is the bent angle of the third bent portion 13r and the fifth bent portion 13v of the front pillar constituting member 13 of the final product. Smaller than that.

  In addition, at both ends in the longitudinal direction of the metal plate 400, as shown in FIGS. 7A and 7B, the metal plate 400 is formed in a V shape with the reference line O as the center. Hereinafter, the metal plate formed through the first step is referred to as a first formed body 400A.

  Here, as shown in FIG. 6A, the third bent portion 13r is located outside the first bent portion 13q with respect to the connection region N, and the fifth bent portion 13v is connected to the connection region N. With respect to the second bent portion 13u. Further, the third bent portion 13r and the fifth bent portion 13v are folded in a mountain shape so as to become narrower toward the both ends in the longitudinal direction and are formed in an arc shape. Further, a side piece 52 is formed at a portion farther from the connection region N than the third bent portion 13r, and a side piece 54 is formed at a portion farther from the connection region N than the fifth bent portion 13v. Is done.

Between the first bent portion 13q and the third bent portion 13r, a first curved surface portion 13c having a concave R is formed in the longitudinal direction of the first forming body 400A (metal plate 400).
In the side piece 52, the third bent portion 13r and the fourth bent portion 13s are crested at the third bent portion 13r by the processed surface 106 of the sub mold KA1c and the processed surface 156 of the lower mold KA2. A second curved surface portion 13b that is bent and formed into a convex R in the longitudinal direction of the first formed body 400A (metal plate 400) is formed. In the side piece 52, the fourth bent portion 13s is formed between the fourth bent portion 13s and the seventh bent portion 13t by the processed surface 108 of the sub mold KA1c and the processed surface 158 of the lower mold KA2. Thus, the first connecting portion 13j that is broken is formed. Further, in the side piece 52, a gap between the seventh bent portion 13t and the side edge on the Y side of the first forming body 400A is defined by the processing surface 110 of the sub mold KA1c and the processing surface 160 of the lower mold KA2. A folded first flange portion 13a is formed.

On the other hand, between the second bent portion 13u and the fifth bent portion 13v, a third curved surface portion 13h having a concave R is formed in the longitudinal direction of the first forming body 400A (metal plate).
In the side piece 54, the fifth bent portion 13v and the sixth bent portion 13w are crested at the fifth bent portion 13v by the processed surface 112 of the sub mold KA1b and the processed surface 162 of the lower mold KA2. A fourth curved surface portion 13g that forms a convex R is formed in the longitudinal direction of the first formed body 400A (metal plate 400) while being folded.

  In the side piece 54, the sixth bent portion 13w is formed between the sixth bent portion 13w and the eighth bent portion 13x by the processed surface 114 of the sub mold KA1b and the processed surface 164 of the lower mold KA2. A second connecting portion 13m that is bent at a point is formed.

  Further, in the side piece 54, the processing surface 116 of the sub mold KA1b and the processing surface 166 of the lower mold KA2 are provided between the eighth bent portion 13x and the side edge of the first forming body 400A on the side opposite to the Y direction. A second flange portion 13f that is broken is formed.

  Instead of forming the concave groove 60 in advance in the first step, it is conceivable to form the bead 13e from the beginning. However, the side pieces 52 and 54 are formed and continuously rotated in a direction to close the side pieces 52 and 54 around the reference line O passing through the center in the width direction at both ends in the longitudinal direction of FIG. In this case, in the central portion in the longitudinal direction, the side pieces 52 and 54 need to be gradually increased while the side pieces 52 and 54 are continuously rotated in the closing direction. However, continuous molding is impossible.

  In the present embodiment, for this reason, the concave groove 60 is formed in the first step as a preliminary molding, and the concave groove 60 (connection region N) that becomes a surplus when rotated in the closing direction in the second step is closed in the closing direction. When the bead 13e is rotated, the bead 13e is formed so as to have a bead height that can absorb the surplus in advance.

(Second step)
Next, a 2nd process is demonstrated with reference to FIGS.
In the second step, as shown in FIGS. 10A and 10B, the first formed body 400A is processed between the cushion KA4a of the lower mold KA4 and the punch KA3 which is the upper mold KA4a. The part 170 is disposed so as to enter the recessed groove 60. In addition, as shown in FIG. 10A, the cushion KA4a has a central portion in the longitudinal direction provided so that the bead forming processing portion 170 increases the bead height, and the closer to the both ends in the longitudinal direction, the closer to the both ends. The bead height is gradually reduced in an arc shape. That is, press molding is performed by the cushion KA4a and the punch KA3, and the bead depth is increased toward the center in the longitudinal direction, and the bead depth is gradually decreased toward both ends in the longitudinal direction.

And as shown in FIG.10 (b), the process part 170 is abbreviate | omitted in the both ends of the longitudinal direction of cushion KA4a, and the process surface 172 of a cross-sectional mountain shape is formed.
As shown in FIG. 10 (a), the central portion in the longitudinal direction of the punch KA3 is provided so that the processing groove 120 for bead formation increases in depth, and the groove becomes closer to both ends in the longitudinal direction. It is formed so that the depth gradually decreases in an arc shape. And as shown in FIG.10 (b), the process groove | channel 120 is lose | eliminated in the both ends of the longitudinal direction of punch KA3, and the process surface 122 of cross-section V shape is formed.

  Next, from the state of FIGS. 10 (a) and 10 (b), the punch KA3 is lowered as shown in FIGS. 11 (a) and 11 (b), and the concave groove 60 is formed by the punch KA3 and the cushion KA4a. A bead 13e is formed in the groove 60 except for both ends in the longitudinal direction while maintaining the longitudinally extending lines of the first bent portion 13q and the second bent portion 13u in the short direction. (I.e., bead out). By this beading out, the part forming the concave groove 60 is pulled inward (bead protruding direction). Due to this bead formation, the width of the concave groove 60 (the medium material in the short direction) is as shown in FIG. 6B and shorter than the length in the state shown in FIG.

  Further, in the concave groove 60 formed in the first step, the portion proximal to the first bent portion 13q and the second bent portion 13u is the processed groove 120 and the processed surface of the punch KA3 shown in FIG. The cross-sectional shape changes depending on the machining surface 127 between 126, the machining surface 171 connected to the machining portion 170 of the cushion KA4a, and the machining surface 172 and the machining surface 122 shown in FIG.

(Third step)
Next, as a third step, the punch KA3 is moved from the state of FIGS. 11A and 11B to the bottom dead center as shown in FIGS. 12A and 12B together with the cushion KA4a. Then, the side pieces 52 and 54 are bent in the closing direction by a pair of dies KA4b and KA4c which are lower molds. This bending is performed within the elastic deformation of the first formed body 400A.

  That is, the third curved surface portion 13h is bent in the closing direction by the processed surface 124 of the punch KA3 and the processed surface 180 of the die KA4b. Further, the first curved surface portion 13c is bent in the closing direction by the processed surface 126 of the punch KA3 and the processed surface 182 of the die KA4b.

  The processed surfaces 124, 126, 180, and 182 are formed by bending the first flange portion 13a and the second flange portion 13f close to the punch KA3 as shown in FIGS. 12 (a) and 12 (b). It is set to be done.

  At this time, the second curved surface portion 13b, the first curved surface portion 13c, the third curved surface portion 13h, the second connecting portion 13m, etc. of each portion of the first formed body 400A are disrupted in relative positional relationship, and the shape is temporarily deformed. It fits within the elastic deformation.

  In this embodiment, since the cushion KA4a is not in a high cushion pressure state, the first curved surface portion 13c and the third curved surface portion 13h are bent in the closing direction after the beading is first performed. When the KA4a is in a high cushion pressure state, the second step of beading and the third step of bending for bending the first curved surface portion 13c and the third curved surface portion 13h in the closing direction may be performed simultaneously. Good.

Hereinafter, the state formed in the third step is shown in FIG. 6C, which is referred to as a second formed body 400B.
(4th process)
In the fourth step, as shown in FIGS. 13A and 13B, the second formed body 400B is housed between the rotating dies KA5b and KA5c that are opened with each other, and the metal KA5a is placed on the mold KA5a. Place on mold KA5a. The upper surface of the mold KA5a has a convex R in the longitudinal direction so as to be in contact with the first bent portion 13q and the second bent portion 13u on both side edges of the concave groove 60 of the second formed body 400B over the entire length. It is a surface.

  The rotary die KA5b is composed of a plurality of dies stacked in the longitudinal direction. Each die is provided so as to be rotatable around a rotation axis T1 disposed along the second bent portion 13u as shown in FIGS. 13 (a) and 13 (b). As shown in FIGS. 13 (a) and 13 (b), each die constituting the rotary die KA5b includes a third curved surface portion 13h, a fourth curved surface portion 13g, a second connecting portion 13m, and a second flange portion 13f. A contactable surface is formed on each of the above. In addition, the angle between adjacent surfaces of the third curved surface portion 13h, the fourth curved surface portion 13g, the second connecting portion 13m, and the second flange portion 13f is determined by the third curved surface. The angles are the same between the adjacent portions of the portion 13h, the fourth curved surface portion 13g, the second connecting portion 13m, and the second flange portion 13f.

  The rotary die KA5c is composed of dies stacked in the longitudinal direction. As shown in FIGS. 13A and 13B, each die is provided so as to be rotatable around a rotation axis T2 disposed along the first bent portion 13q.

  As shown in FIGS. 13 (a) and 13 (b), each die constituting the rotary die KA5c includes a first curved surface portion 13c, a second curved surface portion 13b, a first connecting portion 13j, and a first flange portion 13a. A contactable surface is formed on each of the above. In addition, the angle between adjacent surfaces of the first curved surface portion 13c, the second curved surface portion 13b, the first connecting portion 13j, and the first flange portion 13a is determined by the first curved surface. The angles of the adjacent portions of the portion 13c, the second curved surface portion 13b, the first connecting portion 13j, and the first flange portion 13a are the same.

  As shown in FIGS. 13A and 13B, after the second formed body 400B is stored in a state where the second formed body 400B is opened, it is shown in FIGS. 14A and 14B. As described above, the rotary die KA5b and the rotary die KA5c are rotated in the closing direction around the rotation axis T1 and the rotation axis T2. As a result, the first curved surface portion 13c and the third curved surface portion 13h of the second formed body 400B are bent in the closing direction by the first bent portion 13q and the second bent portion 13u, respectively, and the first flange portion 13a and The second flange portion 13f comes into contact with the palm. 14 (a) and 14 (b), the alternate long and two short dashes line indicates the cross-sectional shape of the second formed body 400B before mold closing.

Hereinafter, the state formed in the fourth step is shown in FIG. 6D, which is referred to as a third formed body 400C.
Thereafter, the rotary die KA5b and the rotary die KA5c are opened, the third formed body 400C is taken out, and the first flange portion 13a and the second flange portion 13f are spot welded.

Now, according to this embodiment, there are the following features.
(1) The front pillar constituting member 13 of the present embodiment is bent by a single metal plate, and has a first side end (first connecting portion 13j, first flange portion 13a) positioned in the lateral direction, and The second side ends (second connection portion 13m, second flange portion 13f) are connected to each other to have a closed cross-sectional space 14. The front pillar constituting member 13 includes a bead 13e that is recessed in the closed cross-section inner side (that is, in the closed cross-section space 14) and whose bead depth gradually decreases toward both ends in the longitudinal direction. And it has the side wall 13d which becomes the concave R in the longitudinal direction. Further, the front pillar constituting member 13 has a first bent portion 13q and a second bent portion 13u, which are formed in an arc shape in the longitudinal direction on both side edges located in the short side direction of the side wall 13d, It has the 1st curved surface part 13c bent by the 1st bending part 13q, and becomes the concave R in a longitudinal direction. Further, the front pillar constituting member 13 is bent at a third bent portion 13r formed in an arc shape in the longitudinal direction with respect to the first curved portion 13c, and is formed into a convex R in the longitudinal direction. The first side end (the first connecting portion 13j and the first flange portion 13a) is bent at a fourth bent portion 13s formed in an arc shape in the longitudinal direction with respect to the second curved surface portion 13b. ing. Further, the front pillar constituting member 13 has a third curved surface portion 13h which is bent at the second bent portion 13u and becomes a concave R in the longitudinal direction, and is arcuate in the longitudinal direction with respect to the third curved surface portion 13h. A fourth curved surface portion 13g that is bent at the formed fifth bent portion 13v and has a convex R in the longitudinal direction is bent, and a sixth curved surface portion 13g is formed in an arc shape in the longitudinal direction. A second side end (second connecting portion 13m, second flange portion 13f) is bent at the bent portion 13w. As a result, according to the first aspect of the present invention, the closed cross-section is formed of a single metal plate and has a curved surface that has a convex R and a concave R in the longitudinal direction and suppresses expansion and contraction. A vehicle component having a space can be provided. In addition, by forming (that is, integrating) the closed cross-section space with a single plate, the plate thickness can be reduced while improving the strength and rigidity, and as a result, the vehicle parts can be reduced in weight. As a result, the front pillar constituting member 13 of the present embodiment suppresses expansion and contraction even though the front pillar constituting member 13 is formed of a single metal plate and has a curved surface having a convex R and a concave R in the longitudinal direction. A vehicle component having a closed cross-sectional space can be provided. In addition, by forming (that is, integrating) the closed cross-section space with a single plate, the plate thickness can be reduced while improving the strength and rigidity, and as a result, the vehicle parts can be reduced in weight.

  (2) In the front pillar constituting member 13 of the present embodiment, the first side end and the second side end have the first flange portion 13a (flange portion) and the second flange portion 13f (flange portion), respectively. By connecting the flange portions to each other, the flange portions can be easily connected.

  (3) In this embodiment, vehicle parts are used for a front pillar. As a result, according to the present embodiment, the effects (1) and (2) can be easily realized in the vehicle component used for the front pillar. Furthermore, by adopting the pillar, the field of view can be expanded while maintaining the strength and rigidity (thinning the cross section).

(4) The manufacturing method of the front pillar component member 13 of the present embodiment includes the following first to fourth steps.
In the first step, the central portion extending in the longitudinal direction of the metal plate 400 is bent at the arc-shaped first bent portion 13q and the arc-shaped second bent portion 13u, and the width of the central portion in the longitudinal direction is increased. The groove 60 is narrowed and narrowed toward the both ends in the longitudinal direction. And the 1st curved surface part 13c used as the concave R in a longitudinal direction is formed with respect to the site | part connected with the concave groove 60 via the 1st bending part 13q, and it is a longitudinal direction with respect to the 1st curved surface part 13c. A second curved surface portion 13b having a convex R in the longitudinal direction is formed by mountain-folding in the arc-shaped third bent portion 13r in the concave groove forming direction. Furthermore, a first side end (first coupling portion 13j, first flange portion 13a) is formed by folding the second curved surface portion 13b with a fourth bent portion 13s having an arc shape in the longitudinal direction. To do. On the other hand, a third curved surface portion 13h having a concave R in the longitudinal direction is formed with respect to the portion connected to the concave groove 60 via the second bent portion 13u, and the longitudinal direction relative to the third curved surface portion 13h is formed. A fourth curved surface portion 13g having a convex R in the longitudinal direction is formed by mountain-folding in an arc-shaped fifth bent portion 13v in the direction in which the groove is formed. Further, a second side end (second connecting portion 13m, second flange portion 13f) is formed by folding the fourth curved surface portion 13g in a longitudinal direction with a sixth bent portion 13w having an arc shape in the longitudinal direction. To do.

  In the second step, the groove 60 is press-formed with a cushion and a punch to form a bead that has a deeper bead depth at the center in the longitudinal direction and gradually decreases the bead depth toward both ends in the longitudinal direction. . In the third step, with the shape of the bead 13e held by the cushion KA4a and the punch KA3, the first curved surface portion 13c is around the first bent portion 13q, and the third curved surface portion 13h is the second bent portion. The first side end (first connecting portion 13j, first flange portion 13a) and the second side end (second connecting portion 13m, second flange portion 13f) are brought close to each other by rotating around 13u.

  In the fourth step, the first curved surface portion 13c is rotated around the first bent portion 13q, and the third curved surface portion 13h is rotated around the second bent portion 13u, so that a first side end (first connection end) The portion 13j, the first flange portion 13a) and the second side end (the second connecting portion 13m, the second flange portion 13f) are brought into contact with each other.

  As a result, according to the manufacturing method of the present embodiment, the expansion and contraction are suppressed even though each of the metal plates has curved surfaces that are convex R and concave R in the longitudinal direction. Vehicle parts having a closed cross-sectional space can be easily manufactured.

  (5) In the manufacturing method of the present embodiment, in the first step, the first flange portion 13a and the second flange portion 13f are bent at the first side end and the second side end, respectively, and in the fourth step, The first flange portion 13a and the second flange portion 13f are brought into contact with each other like a palm. As a result, according to the present embodiment, it is possible to easily obtain a vehicle component in which the flange portions are in contact with each other in the form of a palm.

(6) In the manufacturing method of the present embodiment, vehicle parts are used for the front pillar. According to this embodiment, the manufacturing method of the vehicle components used for a front pillar can be provided easily.

In addition, this invention is not limited to the said embodiment, It can also be as follows.
In the above embodiment, the front pillar constituting member 13 is embodied as a vehicle part, but may be embodied in other vehicle parts. For example, a front header that supports the roof panel or a rear header may be embodied.

  -In the said embodiment, the 1st side end is comprised by the 1st connection part 13j and the 1st flange part 13a, and the 2nd side end is comprised by the 2nd connection part 13m and the 2nd flange part 13f. Instead, the shape may be changed to the shape shown in FIG. That is, in FIG.3 (b), the 1st connection part 13j and the 4th bending part 13s are abbreviate | omitted in the structure of the said embodiment, and the 1st side end is comprised only by the 1st flange part 13a. Further, the second connecting portion 13m and the sixth bent portion 13w are omitted, and the second side end is constituted only by the second flange portion 13f. Even such a configuration can be employed as the front pillar component member 13. Of course, it is employable as other vehicle members, such as a front header and a rear header. In this case, the first connecting portion 13j and the second connecting portion 13m are connected and fixed by arc welding or the like.

  -Although the manufacturing method of the said embodiment was made into the manufacturing method of the front pillar structural member 13, it is also possible to materialize in the manufacturing method of other vehicle members, such as a front header and a rear header.

13 ... Front pillar component member, 13a ... First flange portion, 13b ... Second curved surface portion,
13c ... 1st curved surface part, 13d ... Side wall, 13e ... Bead,
13f ... 2nd flange part, 13g ... 4th curved surface part, 13h ... 3rd curved surface part,
13j ... 1st connection part, 13m ... 2nd connection part, 13q ... 1st bending part,
13r ... 3rd bent part, 13s ... 4th bent part, 13t ... 7th bent part,
13u ... 2nd bent part, 13v ... 5th bent part, 13w ... 6th bent part,
13x ... 8th bent part, 14 ... closed cross-section space, 60 ... concave groove,
350, 400 ... metal plate, KA3 ... punch, KA4a ... cushion.

Claims (6)

A vehicle component that is bent by a single metal plate and has a closed cross-sectional space in which a first side end and a second side end located in the lateral direction are connected to each other,
It is recessed inward in the closed cross section, has a bead whose bead depth gradually decreases toward both ends in the longitudinal direction, and has a side wall that becomes a concave R in the longitudinal direction,
On both side edges located in the short side direction of the side wall, each has a first bent part formed in an arc shape in the longitudinal direction, and a second bent part,
Having a first curved surface portion which is bent at the first bent portion and becomes a concave R in the longitudinal direction;
A second curved surface portion that is bent at a third bent portion that is formed in an arc shape in the longitudinal direction with respect to the first curved surface portion, and has a convex R in the longitudinal direction,
The first side end is bent at a fourth bent portion formed in an arc shape in the longitudinal direction with respect to the second curved surface portion,
A third curved surface portion which is bent at the second bent portion and becomes a concave R in the longitudinal direction;
The fourth curved surface portion which is bent at the fifth bent portion formed in an arc shape in the longitudinal direction with respect to the third curved surface portion and becomes a convex R in the longitudinal direction is folded,
A vehicle component having a closed cross-sectional space, wherein the second side end is bent at a sixth bent portion formed in an arc shape in the longitudinal direction with respect to the fourth curved surface portion.   The vehicle part having a closed cross-section space according to claim 1, wherein the first side end and the second side end each have a flange portion, and both the flange portions are connected to each other.     The vehicle part having a closed cross-section space according to claim 1 or 2, wherein the vehicle part is used for a front pillar. In a method of manufacturing a vehicle component having a closed cross-sectional space, in which a first side end and a second side end, which are bent by a single metal plate and are respectively positioned in the lateral direction, are connected to each other, the process includes the following steps: A method for manufacturing a vehicle component characterized by the above.
<First step>
A central portion extending in the longitudinal direction of the metal plate is bent at an arc-shaped first bent portion and an arc-shaped second bent portion, so that the width of the central portion in the longitudinal direction is wide and at both ends in the longitudinal direction. Draw grooves that narrow each other as you go,
Forming a first curved surface portion which becomes a concave R in the longitudinal direction with respect to a portion connected to the concave groove via the first bent portion;
A second curved surface portion having a convex R in the longitudinal direction is formed by folding the first curved surface portion in the longitudinal direction at the arc-shaped third bent portion in the longitudinal direction,
A first side end is formed by folding the second curved surface portion with a fourth bent portion having an arc shape in the longitudinal direction,
On the other hand, forming a third curved surface portion that becomes a concave R in the longitudinal direction with respect to the portion connected to the concave groove through the second bent portion,
A fourth curved surface portion that is convex R in the longitudinal direction is formed by folding the third curved surface portion in the longitudinal direction at the fifth bent portion that is arcuate in the longitudinal direction,
A drawing step of forming a second side end by folding the fourth curved surface portion in a longitudinal direction at a sixth arc-shaped bent portion.
<Second step>
A step of forming a bead in which the concave groove is press-molded with a cushion and a punch, and the bead depth is deepened toward the center in the longitudinal direction, and the bead depth is gradually decreased toward both ends in the longitudinal direction.
<Third step>
In a state where the shape of the bead is held by the cushion and the punch, the first curved surface portion is rotated around the first bent portion and the third curved surface portion is rotated around the second bent portion. A bending step of bringing the side end and the second side end closer.
<4th process>
A bending step of rotating the first curved surface portion around the first bent portion and the third curved surface portion around the second bent portion to contact the first side end and the second side end. In the first step, a flange portion is bent at each of the first side end and the second side end,
5. The method of manufacturing a vehicle part having a closed cross-sectional space according to claim 4, wherein, in the fourth step, the flange portions of the first side end and the second side end are brought into contact with each other in the shape of a palm.   The method of manufacturing a vehicle part having a closed cross-sectional space according to claim 4 or 5, wherein the vehicle part is used for a front pillar.

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