Method for manufacturing a press-formed product and press-forming device

Abstract

The present invention is a press forming device (30) that obtains a press-formed product in a flanged hat shape by compressing a preliminary formed product in a flanged hat shape between a punch (31) as a first die and a die (32a, 32b) as a second die, characterized by comprising: the punch (31) and the die (32a, 32b) that constitute a compression mechanism that compresses a flange and a side wall of the preliminary formed product in a flanged hat shape; a compression block (34a, 34b) that constitutes a first pressing mechanism that presses an outer side end portion of the flange of the preliminary formed product in a flanged hat shape; and a seat pad (35a) that constitutes a second pressing mechanism that presses an upper side end portion of the side wall of the preliminary formed product in a flanged hat shape.

Description

Technical Field

[0001] This invention relates to a method for manufacturing stamped articles and a stamping apparatus. Background Technology

[0002] Previously, a known method for manufacturing stamped products was as follows: for a blank with a U-shaped cross section obtained by bending a blank plate, the lower end of the U-shaped longitudinal wall portion that becomes the open side abuts against the lower die, the longitudinal wall portion is compressed in the vertical direction between the upper die and the lower die (for example, see Patent Document 1).

[0003] According to this manufacturing method, by preventing springback that occurs when the longitudinal walls open up to each other, the dimensional accuracy of the obtained stamped parts can be improved.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 6527544 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, as long structural members commonly used in vehicle body frames, they mostly have a closed cross-section structure in which two halves (half a shell) with a cap-shaped cross-section are interlocked and welded together with flanges corresponding to the cap-shaped edge portion. Therefore, in the manufacturing method of such stamped articles with a cap-shaped cross-section, it is desirable to prevent springback.

[0009] However, in the manufacturing method of stamped articles with a cross-section resembling a cap, it is necessary to prevent not only springback that occurs when the longitudinal walls open up to each other, but also springback that occurs when the angle between the longitudinal walls and the flange opens. Therefore, in existing manufacturing methods of stamped articles (for example, see Patent Document 1), it is not possible to sufficiently improve the dimensional accuracy of stamped articles with a cross-section resembling a cap.

[0010] The objective of this invention is to provide a method for manufacturing stamped articles and a stamping apparatus that can produce stamped articles with a cap-shaped cross-section that has excellent dimensional accuracy and sufficiently suppresses springback through a simple process.

[0011] Solution for solving the problem

[0012] The method for manufacturing stamped articles of the present invention, which solves the above-mentioned problems, is characterized in that a second cross-section curved plate is obtained by in-plane compression of the first cross-section curved plate between a first mold and a second mold, in a manner from the sidewall of the raised portion forming the edge cap shape in the first cross-section to the flange of the edge cap shape along the perimeter direction of the edge cap shape.

[0013] Furthermore, the stamping forming apparatus of the present invention, which solves the above-mentioned problems, obtains a second cross-section with a bendable shape by compressing a first cross-section with a bendable shape between a first die and a second die. The bendable shape has the following features: a sidewall formed to correspond to a bendable portion and extending along the height direction of the bend; and a flange formed to correspond to the bendable edge portion and extending from the end of the sidewall in a direction away from the outside at the opening side of the bend. The first die is composed of a punch, and the punch has a first wall surface formed to correspond to the sidewall of the second cross-section with a bendable shape and a second wall surface formed to correspond to the flange of the second cross-section with a bendable shape. The first angle is continuous, and the second mold is composed of a punch, wherein a third wall surface parallel to the first wall surface and a fourth wall surface parallel to the second wall surface of the punch form a second corner and are continuous. The stamping forming apparatus includes: a compression mechanism that brings the first corner and the second corner closer together, compressing the sidewall and the flange of the first cross-section of the edge-cap-shaped curved plate between the first wall surface and the third wall surface, and between the second wall surface and the fourth wall surface; a first pressing mechanism that presses the end of the flange of the first cross-section of the edge-cap-shaped curved plate opposite to the first corner side toward the first corner side; and a second pressing mechanism that presses the end of the sidewall of the first cross-section of the edge-cap-shaped curved plate opposite to the first corner side toward the first corner side.

[0014] The effects of the invention

[0015] According to the present invention, a method for manufacturing stamped articles and a stamping apparatus are provided, which can obtain stamped articles with a cap-shaped cross section that have excellent dimensional accuracy and sufficient springback suppression with a simple process. Attached Figure Description

[0016] Figure 1 This is a partial perspective view showing an example of a stamped article that can be obtained by the manufacturing method according to an embodiment of the present invention.

[0017] Figure 2 This is a structural illustration of the stamping forming apparatus according to an embodiment of the present invention.

[0018] Figure 3 yes Figure 2 A magnified view of part III.

[0019] Figure 4A This is a process description diagram of a method for manufacturing a stamped product according to an embodiment of the present invention. It shows the process of placing a pre-formed product (a plate with a first cross-section in the shape of a cap along the edge) as a compression material on a punch.

[0020] Figure 4B This is a process description diagram of the manufacturing method of a stamped article according to an embodiment of the present invention. It shows the process of pressing the end of the springback flange of a pre-formed article (a plate with a first cross-section that is bent in the shape of an edge cap) which is used as a compression material along the surface direction.

[0021] Figure 4C This is a process illustration of the manufacturing method of the stamped product according to an embodiment of the present invention, and a process illustration of the compression of the side wall of the pre-formed product (a plate with a first cross-section that is bent in the shape of an edge cap).

[0022] Figure 4D This is a process description diagram of the manufacturing method of the stamped product according to an embodiment of the present invention, showing the state in which the sidewall of the pre-formed product (a plate with a first cross-section that is bent in the shape of an edge cap) is compressed in-plane.

[0023] Figure 4E This is a process description diagram of the manufacturing method of the stamped product according to an embodiment of the present invention, showing the state of obtaining the stamped product (a plate with a second cross section that is bent along the edge cap) in a mold.

[0024] Figure 5A This is a structural illustration of a modified example of the stamping forming apparatus of the present invention.

[0025] Figure 5B yes Figure 5A The diagram illustrates the operation of a stamping forming device in a modified example. Detailed Implementation

[0026] Next, the method for manufacturing a stamped article (hereinafter, sometimes simply referred to as the stamping method) and the stamping apparatus for carrying out the method will be described in detail with appropriate reference to the accompanying drawings.

[0027] The stamping forming method of this embodiment is a method of obtaining a final formed product with a cross-section of a hat-shaped edge by compressing a pre-formed product, for example, a sheet metal such as a steel plate, in a mold through in-plane compression.

[0028] Hereinafter, after describing an example of a stamped article obtained in this embodiment, the stamping apparatus and stamping method will be described. Furthermore, the vertical direction in the following description is based on the vertical direction of the stamping apparatus. Additionally, the vertical direction of the stamped article is the same as the vertical direction of the stamped article obtained within the stamping apparatus.

[0029] [Stamped parts]

[0030] Figure 1 This is a partially enlarged perspective view showing an example of a stamped product 10 that can be obtained by the stamping method of this embodiment.

[0031] The stamped product 10 in this embodiment is envisioned as a long structural member made of high-tensile steel sheet used in automobile body frames, etc., but it is not limited to this and can be applied to structural members made of various metal materials used in various fields. Furthermore, for ease of drawing cross-sections, Figure 1 The stamped part 10 is shown by partially cutting it open.

[0032] like Figure 1 As shown, the stamped part 10 is a component (strip component) that is longer in one direction, and the cross section that intersects the length direction is shaped like a cap along the edge.

[0033] As is well known, the brim cap has: a pair of sidewalls 13a, 13b forming the sides of the raised portion 11; a top 14 of the raised portion 11 connecting one end (upper end) of the pair of sidewalls 13a, 13b to each other; and a pair of flanges 15a, 15b forming the brim portion 12 (edge ​​portion).

[0034] The raised portion 11 is roughly U-shaped, with one end of each of the pair of sidewalls 13a and 13b closed on the top 14 side and the other end (lower end) of the sidewalls 13a and 13b open. Furthermore, the flanges 15a and 15b are formed on the opening side of the roughly U-shaped raised portion 11, extending outward (in the direction away from the opening) from the lower edge (lower edge) of each of the pair of sidewalls 13a and 13b.

[0035] In this embodiment, the top 14 of the raised portion 11 has a transverse wall 16 that is mounted on one end of each of a pair of side walls 13a and 13b via chamfered portions 17a and 17b.

[0036] In addition, in this embodiment, the chamfered portions 17a and 17b forming the top 14 are formed by inclined surfaces that gradually narrow in width from one end of a pair of sidewalls 13a and 13b toward the top. However, they can also be formed by curved surfaces (R surfaces) that bulge upwards instead of these inclined surfaces.

[0037] Alternatively, the top 14 can be connected at a predetermined angle to one end of the transverse wall 16 relative to the side walls 13a and 13b, without going through the chamfered portions 17a and 17b or the curved surface (not shown),

[0038] Furthermore, the stamped article 10 in this embodiment is envisioned to have a cap-shaped cross-section along its entire length, but it may also have a cap-shaped cross-section along a portion of its length. Additionally, the sidewalls 13a, 13b, and transverse wall 16 are not limited to being flat plates along their length; curved surfaces that warp relative to the length direction are also permissible. Furthermore, the sidewalls 13a, 13b, and transverse wall 16 may each include a few irregularities such as steps or protrusions formed in the surface direction. Additionally, holes extending in the thickness direction may be formed in the sidewalls 13a, 13b, and transverse wall 16.

[0039] In addition, in this embodiment, the stamped article 10 is designed such that the length of the raised portion 11 of one of the sidewalls 13a and 13b in the height direction (vertical direction) is shorter than the length of the raised portion 11 of the other sidewall 13b in the height direction (vertical direction), but the lengths of the pair of sidewalls 13a and 13b can also be the same.

[0040] In addition, the stamped product 10 in this embodiment is envisioned as a stamped product in which the width (length of the direction intersecting the long side direction) of a pair of flanges 15a and 15b is the same, but the width of a pair of flanges 15a and 15b may also be different from each other.

[0041] In this embodiment, the stamped product 10 is connected to a separately prepared component (not shown) by spot welding or the like, thereby forming a closed cross section between the separately prepared component and the inner side of the raised portion 11.

[0042] In addition, as other prepared components, examples include the floor of the vehicle body, the plate component forming the lower instrument panel component, and another edge cap-shaped component (another half) that is joined to the stamped product 10 as a half-body, but it is not limited to these.

[0043] The stamped article 10, as such a final product, is formed using a stamping apparatus 30 described later (see reference). Figure 2 The formed shape is equivalent to the "second section is a bendable plate with a cap-shaped edge" described in the technical solution.

[0044] Furthermore, the stamped product 10 and the pre-formed product 20, which is supplied as material to the stamping apparatus 30 in order to obtain the stamped product 10 (see reference 10) Figure 4AThis is different. The pre-formed article 20 is equivalent to the (first cross-section is a bendable plate with a cap-like shape along the edge) described in the technical solution. The pre-formed article 20 will be described in detail later along with the description of the "stamping method".

[0045] [Stamping Forming Equipment]

[0046] Figure 2 This is a structural illustration of the stamping forming apparatus 30 of this embodiment. Figure 2 The state of the stamping forming apparatus 30 as viewed from the front is shown in a general manner.

[0047] like Figure 2 As shown, the stamping forming apparatus 30 mainly includes a punch 31, a pair of dies 32a and 32b, a cam mechanism 40 for driving the dies 32a and 32b respectively, and a pre-formed article 20 (described later) disposed on the punch 31. Figure 4A The retention of the sidewalls 23a and 23b (refer to) Figure 4A It is composed of a seat cushion 35a that is pressed by pressing.

[0048] As will be explained in detail below, the stamping forming apparatus 30 of this embodiment uses a punch 31, dies 32a and 32b, and a seat 35a to form the pre-formed article 20 (see below). Figure 4A ) sidewalls 23a, 23b (see Figure 4A ) and flanges 25a, 25b (see Figure 4A In-plane compression is performed.

[0049] (Punch and die)

[0050] In this embodiment, the punch 31 is conceived as a fixed mold, equivalent to the "first mold" described in the technical solution. Furthermore, in this embodiment, the dies 32a and 32b are conceived as movable molds, equivalent to the "second mold" described in the technical solution. Additionally, in the stamping forming apparatus 30, the dies 32a and 32b can also be positioned on the fixed side, and the punch 31 on the movable side.

[0051] Figure 3 yes Figure 2 A magnified view of part III in the image.

[0052] like Figure 3 As shown, the punch 31 in this embodiment has a cross-section that mimics the shape of a hat along the edge and is elongated in one direction as described above for the stamped product 10 (see reference). Figure 1 The compression forming surface on the concave side of the convex surface 18 and the concave surface 19 of the convex surface 18.

[0053] Furthermore, the punch 31 (refer to) Figure 3 ) and stamped product 10 (refer to Figure 1Matching the terrain to form a direction (with) Figure 3 (A long horizontal strip) perpendicular to the paper surface.

[0054] Specifically, such as Figure 3 As shown, the punch 31 has a base portion 31a made of a generally rectangular parallelepiped and a protrusion 31b made of a generally rectangular parallelepiped. Furthermore, the protrusion 31b is located in the width direction of the base portion 31a (…). Figure 3 It is formed in the center of the paper (in the left and right directions) with a width narrower than that of the base portion 31a, protruding upwards.

[0055] The punch 31 of this embodiment has a raised portion 11 (see reference) that corresponds to the stamped product 10. Figure 1 The side walls 13a and 13b (refer to) Figure 1 The first wall surfaces 53a and 53b of the corresponding protrusions 31b, and the flanges 15a and 15b (see reference) Figure 1 The second wall surfaces 55a and 55b of the base portion 31a corresponding to the base portion 31a.

[0056] Furthermore, the first wall surface 53a is continuous with the second wall surface 55a via the first corner portion 58a, and the first wall surface 53b is continuous with the second wall surface 55b via the first corner portion 58b.

[0057] Furthermore, the base portion 31a has an outer end face 36a that intersects with the second wall surface 55a on the opposite side of the first corner portion 58a. Additionally, the base portion 31a has an outer end face 36b that intersects with the second wall surface 55b on the opposite side of the first corner portion 58b. These outer end faces 36a and 36b are formed in the vertical direction.

[0058] Furthermore, at the lower stop point of the dies 32a and 32b described later, the fifth wall surfaces 37a and 37b of the compression blocks 34a and 34b can abut against the respective outer end surfaces 36a and 36b of the base portion 31a.

[0059] Punch 31 and stamped product 10 (see reference) Figure 1 Top 14 (refer to) Figure 1 The top 31c is formed in a manner corresponding to the stamped product 10 (see reference). Specifically, the punch 31 is aligned with the stamped product 10 (see reference). Figure 1 ) transverse wall 16 (refer to) Figure 1 The transverse wall surface 56 is formed in a manner corresponding to the stamped product 10 (see reference). Additionally, the punch 31 is aligned with the stamped product 10 (see reference). Figure 1 The chamfered portions 17a and 17b (refer to) Figure 1 The inclined walls 57a and 57b are formed in a corresponding manner. Moreover, the inclined walls 57a and 57b are continuous with the first walls 53a and 53b at a predetermined angle.

[0060] The length from one side of the punch 31, including the second wall 55a, the first corner 58a, the first wall 53a, and the inclined wall 57a, through the transverse wall 56 to the other side, including the inclined wall 57b, the first wall 53b, the first corner 58b, and the second wall 55b, i.e., the circumference of the punch 31, is set to be equal to the circumference of the stamped product 10 corresponding to the punch 31.

[0061] Next, the punching dies 32a and 32b will be explained.

[0062] like Figure 2 As shown, in this embodiment, the dies 32a and 32b are each integrated with the cam slide members 41a and 41b of the cam mechanism 40, which are capable of moving forward and backward at a predetermined angle relative to the compression forming surface of the punch 31.

[0063] Dies 32a and 32b are respectively positioned laterally with the protrusion 31b of the punch 31 as the center. Figure 2 A pair of dies are positioned at the left-right direction of the paper. That is, dies 32a and 32b are respectively positioned at the right-right direction of the paper. Figure 2 It is composed of a long strip of material (vertical to the paper surface) to correspond to the horizontal punch 31.

[0064] Specifically, in Figure 3 In the shown front view, die 32a and die 32b are respectively configured to be approximately linearly symmetrical with respect to the central axis Ax of the protrusion 31b extending in the vertical direction. Furthermore, in this embodiment, the central axis Ax of the protrusion 31b can be used in the vertical direction (with...) Figure 3 The axis extending in the same vertical direction defines the transverse direction of the transverse wall surface 56. Figure 2 The center of the paper (from left to right).

[0065] Die 32a includes a die body 33a and a compression block 34a integrally mounted on the die body 33a. Die 32b includes a die body 33b and a compression block 34b integrally mounted on the die body 33b.

[0066] One die body 33a, which is disposed corresponding to the first wall surface 53a of one of the punches 31, has a third wall surface 63a that is parallel to and faces the first wall surface 53a. The other die body 33b, which is disposed corresponding to the first wall surface 53b of the other punch 31, has a third wall surface 63b that is parallel to and faces the first wall surface 53b.

[0067] Furthermore, one die body 33a has a fourth wall surface 65a that is parallel to the second wall surface 55a of one side of the punch 31 and is continuous with the third wall surface 63a via the second corner portion 68a. The other die body 33b has a fourth wall surface 65b that is parallel to the second wall surface 55b of the other side of the punch 31 and is continuous with the third wall surface 63b via the second corner portion 68b.

[0068] The perimeter of the die body 33a, which extends from the third wall 63a of the die body 33a to the fourth wall 65a via the second corner 68a, is set to be equal to the perimeter of the punch 31, which extends from the first wall 53a of the punch 31 to the second wall 55a via the first corner 58a.

[0069] Furthermore, the perimeter of the die body 33b extending from the third wall 63b of the other die body 33b via the second corner 68b to the fourth wall 65b is set to be equal to the perimeter of the punch 31 extending from the first wall 53b of the punch 31 via the first corner 58b to the second wall 55b.

[0070] Next, the compression blocks 34a and 34b will be explained.

[0071] like Figure 3 As shown, compression block 34a is disposed at the base end of die body 33a located on the side of cam slider 41a (described later), and is integral with die body 33a below it. Additionally, compression block 34b is disposed at the base end of die body 33b located on the side of cam slider 41b (described later), and is integral with die body 33b below it.

[0072] In this embodiment, the compression blocks 34a and 34b are respectively conceived to be positioned in a direction corresponding to the stamped product 10. Figure 3 The compression blocks 34a and 34b are roughly rectangular blocks that are longer in the direction perpendicular to the paper. Furthermore, in this embodiment, the compression blocks 34a and 34b are envisioned as structures formed by attaching components separate from the die bodies 33a and 33b to the die bodies 33a and 33b. However, the compression blocks 34a and 34b can also be integrally formed with the die bodies 33a and 33b, respectively.

[0073] A fifth wall surface 37a is formed on the compression block 34a, which faces the outer end face 36a of the base portion 31a parallel to it. Similarly, a fifth wall surface 37b is formed on the compression block 34b, which faces the outer end face 36b of the base portion 31a parallel to it.

[0074] As will be described later, the fifth wall surfaces 37a and 37b of such compression blocks 34a and 34b can respectively abut against the outer end surfaces 36a and 36b of the punch 31 at the lower dead center of the die 32a and 32b.

[0075] (Cam mechanism)

[0076] Next, regarding the cam mechanism 40 (refer to...) Figure 2 (This will be explained.)

[0077] like Figure 2 As shown, the cam mechanism 40 is mainly composed of: a pair of cam sliders 41a and 41b, respectively, which are configured to correspond to the aforementioned punches 32a and 32b; a pair of cam bases 42a and 42b, which are configured to correspond to these cam sliders 41a and 41b; and a pair of cam drivers 43a and 43b, which are configured to correspond to the cam sliders 41a and 41b.

[0078] Furthermore, these cam sliders 41a, 41b, cam bases 42a, 42b, and cam drivers 43a, 43b are arranged in a direction (perpendicular to) corresponding to the dies 32a, 32b. Figure 2 The longer components are formed on the paper (in the direction of the paper).

[0079] The cam slider 41a moves the die 32a toward the punch 31 or moves the die 32a away from the punch 31 by raising or lowering the inclined surface 45a of the cam base 42a in the inclined direction.

[0080] In addition, the cam slider 41b moves the die 32b toward the punch 31 or moves the die 32b away from the punch 31 by raising and lowering the inclined surface 45b of the cam base 42b in the inclined direction.

[0081] That is, the cam sliders 41a and 41b move the dies 32a and 32b toward the punch 31 by the angles θa and θb formed by the horizontal plane Hp and the respective inclined surfaces 45a and 45b on the narrow angle side.

[0082] Incidentally, angles θa and θb can be set within a range exceeding 0 degrees and less than 90 degrees (0° (deg) < θa, θb < 90° (deg)), but are preferably between 15 degrees and 60 degrees, and particularly preferably around 15 degrees. Such angles θa and θb can be the same or different. Furthermore, in this embodiment, angles θa and θb are each assumed to be 15 degrees.

[0083] Cam bases 42a and 42b respectively support cam sliders 41a and 41b in a manner that allows them to slide along inclined surfaces 45a and 45b.

[0084] Furthermore, in this embodiment, the cam bases 42a and 42b are integrally formed. Moreover, the central portion where the cam bases 42a and 42b are connected to each other also serves as the support portion of the punch 31.

[0085] Furthermore, the cam bases 42a and 42b each have force-applying components 46a and 46b that apply force to each cam slider 41a and 41b in the direction that causes it to move away from the punch 31. There are no particular limitations on these force-applying components 46a and 46b; for example, they can be of a known configuration where a spring S is arranged between the cam base 42a and the cam slider 41a, and between the cam base 42b and the cam slider 41b. Examples of such springs S include pneumatic springs and helical springs.

[0086] Imagine such force-applying components 46a, 46b along the respective length directions of the cam bases 42a, 42b (and...). Figure 2 Multiple arrangements can be made in a way that allows them to be arranged vertically on the paper.

[0087] In this embodiment, the cam drives 43a and 43b are integrated with the seat cushion unit 35, which includes the seat cushion 35a described later. Figure 2 In the front view of the stamping forming apparatus 30 shown, it is roughly E-shaped with an opening to the bottom. That is, the cam drives 43a and 43b are respectively connected to the seat support portion 35c, which extends horizontally below the lifting mechanism 39 described later and is capable of moving up and down.

[0088] Specifically, the cam drivers 43a and 43b are respectively connected to the seat support portion 35c at their upper ends in a manner that clamps the seat cushion unit 35 in the center. Moreover, the cam drivers 43a and 43b extend downward from the side of the seat support portion 35c to form cam surfaces 44a and 44b for driving the cam sliders 41a and 41b.

[0089] Cam surfaces 44a and 44b are formed on the lower end surfaces of cam actuators 43a and 43b that face the cam sliders 41a and 41b.

[0090] These cam surfaces 44a and 44b are each composed of inclined surfaces that gradually shift downwards as they move away from the seat cushion 35a held in the center.

[0091] Furthermore, sliding members 47a and 47b are installed on the upper surfaces of the cam sliders 41a and 41b respectively. The sliding members 47a and 47b guide the cam sliders 41a and 41b along the cam surfaces 44a and 44b by sliding relative to the cam surfaces 44a and 44b.

[0092] When the seat support 35c moves downward using a lifting mechanism 39 equipped with, for example, a hydraulic cylinder, the cam drivers 43a and 43b move the cam sliders 41a and 41b toward the punch 31 via cam surfaces 44a and 44b. That is, the cam surfaces 44a and 44b overcome the forces of the force-applying components 46a and 46b, respectively, and push the cam sliders 41a and 41b toward the punch 31 at the aforementioned angles θa and θb.

[0093] Conversely, when the lifting mechanism 39 moves the seat support 35c upward, the pressing force (propulsive force) of the cam surfaces 44a and 44b on the cam sliders 41a and 41b is released. As a result, the cam sliders 41a and 41b return to their original positions through the force applied by the force-applying components 46a and 46b.

[0094] (seat cushion)

[0095] Next, regarding seat cushion 35a (refer to...) Figure 2 (This will be explained.)

[0096] In this embodiment, the seat cushion 35a is similar to the stamped product 10 (see reference). Figure 1 The corresponding method is determined by one direction (and) Figure 2 It consists of roughly rectangular blocks that extend vertically along the paper surface.

[0097] Moreover, such as Figure 2 As shown, the seat cushion 35a is mounted on the seat cushion support 35c via the cushioning member 35b, which will be described later, in a manner that places it above the punch 31.

[0098] like Figure 3 As shown, the seat cushion 35a has a groove 35d at its lower end facing the punch 31, into which the top 31c of the punch 31 is inserted. This groove 35d is designed to engage with the stamped article 10 (see reference 10). Figure 1 The corresponding method is in one direction (and) Figure 3 It extends in the direction perpendicular to the paper.

[0099] Specifically, the groove 35d has a groove that is compatible with the stamped product 10 (see reference). Figure 1 ) transverse wall 16 (refer to) Figure 1 The bottom surface 35d1 is formed in the manner corresponding to the stamped part 10 (refer to...). Figure 1 The chamfered portions 17a and 17b (refer to) Figure 1 The corresponding side surfaces 35d2 and 35d3 are formed in the same way.

[0100] The buffer member 35b in this embodiment (refer to...) Figure 2 The spring is envisioned as a helical spring, but other springs such as a pneumatic spring can also be used as the buffer member 35b.

[0101] like Figure 2 As shown, in this embodiment, the cushioning member 35b is housed in a cylindrical space 35e, which is formed above the groove 35d and extends vertically along the seat cushion 35a. Furthermore, the lower end of the cushioning member 35b is mounted to a spring seat (not shown) located at the bottom of the cylindrical space 35e, and the upper end is mounted to the seat cushion support 35c.

[0102] Additionally, such a cushioning member 35b is located along the length of the seat cushion 35a (in relation to...). Figure 3 Multiple [items] are arranged on the paper (vertically).

[0103] Furthermore, the buffer member 35b is in the case of... Figure 2 As shown, the seat cushion 35a moves from the punch 31 to the position described later (see reference). Figure 4C ) becomes the start of the pre-molded article 20 (refer to Figure 4C The top 24 (refer to) Figure 4C During the period until the spring is compressed and formed, the spring constant is adjusted to have a compression allowance. Additionally, the buffer member 35b, from the beginning of the compression forming process at the top 24 (refer to...) Figure 4C The state of compression forming (refer to) Figure 4C ) to at least reach the lower stop point of the seat cushion 35a (refer to) Figure 4E It cannot contract until then. And, from Figure 2 The state shown serves to Figure 4C Up to the state shown, the spring constant of the cushioning member 35b is adjusted so that the seat cushion 35a can hold the pre-molded product 20 (see reference). Figure 4A The top 24 (refer to) Figure 4A ).

[0104] [Stamping Forming Method]

[0105] Next, the stamping forming apparatus 30 of this embodiment (refer to...) Figure 2 The operation of the stamping apparatus 30 will be explained, and the stamping method of this embodiment implemented by the stamping apparatus 30 will also be explained.

[0106] Figures 4A to 4E This is a process diagram illustrating the stamping forming method.

[0107] Figure 4A This diagram shows the process (first process) of placing the pre-formed article 20 (a plate with a first cross-section that is bent in the shape of a cap along the edge) onto the punch 31. Figure 4B This diagram shows the process (second process) of pressing the ends of the springback flanges 25a and 25b of the preformed article 20 (a plate with a first cross-section that is bent in the shape of a cap along the edge) towards its surface. Figure 4C This is an explanatory diagram of the process (third process) of the side walls 23a and 23b of the compressed preform (the first section is a curved plate with a cap-shaped edge). Figure 4D This diagram shows the state in which the sidewalls 23a and 23b of the pre-formed article 20 (the first section is a curved plate with a cap-like shape along the edge) are compressed in-plane. Figure 4E This diagram shows the state of the stamped product 10 (the second section is a curved plate with a cap-shaped edge) obtained in the mold (punch 31, die 32a, 32b).

[0108] (First process)

[0109] like Figure 4A As shown, in the first step of the stamping forming method of this embodiment, the pre-formed article 20 is placed on the punch 31.

[0110] The preform 20 (a plate with a first cross-section that is bent in the shape of a hat along the edge) is, as described above, equivalent to the "plate with a first cross-section that is bent in the shape of a hat along the edge" as described in the technical solution.

[0111] in addition, Figure 4A As shown Figure 2 After the pre-molded article 20 is placed on the punch 31 with the seat 35a separated from the punch 31 as shown, the lifting mechanism 39 is lowered and the top 24 of the pre-molded article 20 is held by the seat 35a.

[0112] As a result of stamping product 10 (refer to) Figure 1 The pre-formed article 20 of the material can be manufactured, for example, by supplying a blank such as a high-tensile steel sheet to a stamping forming apparatus, which includes: a convex surface 18 that mimics the stamped article 10 (see reference 10). Figure 1 The die has a compression forming surface on one side (illustration omitted); and a concave surface 19 that mimics the stamped article 10 (see reference). Figure 1 The punch on the compression forming surface of the side (illustration omitted).

[0113] Such pre-formed articles 20 mainly utilize the stress generated in the bending part of the blank to produce so-called springback.

[0114] Specifically, 20 pre-molded articles Figure 4A As shown, when the top 24 is held above the punch 31 by the seat cushion 35a, the side walls 23a and 23b of the preform 20 are respectively lifted from the first wall surfaces 53a and 53b of the punch 31.

[0115] Furthermore, in the first step of this embodiment, such as Figure 4A As shown, the sidewalls 23a and 23b are prepared according to the stamped product 10 (refer to...). Figure 1The side walls 13a and 13b (refer to) Figure 1 The pre-formed article 20 is of a certain length. Furthermore, the lengths of the flanges 25a and 25b of the pre-formed article 20 are respectively the same as those of the stamped article 10 (see reference). Figure 1 Flanges 15a and 15b (refer to) Figure 1 Each of them has the same length.

[0116] However, the preform 20 is not limited thereto. As other embodiments of the present invention, as will be described later, the lengths of the flanges 25a and 25b can also be changed.

[0117] (Second process)

[0118] Next, the second step of the stamping forming method in this embodiment will be described.

[0119] In this second process, such as Figure 4B As shown, the compression blocks 34a and 34b press down to generate the outer ends 28a and 28b of the spring-back flanges 25a and 25b.

[0120] In this second process, firstly, when the lifting mechanism 39 (refer to...) Figure 2 ) so that the seat cushion support part 35c (refer to) Figure 2 From position 35a of the seat cushion Figure 4A When the state shown moves downwards, as Figure 4B As shown, the seat cushion 35a abuts against the top 24 of the pre-molded article. At this time, as... Figure 4B As shown, the cushioning member 35b shrinks while pressing the top 24 of the preform 20 more forcefully via the seat cushion 35a.

[0121] on the other hand, Figure 2 The cam drives 43a and 43b shown are connected via lifting mechanism 39 (see reference). Figure 2 ) so that the seat cushion support part 35c (refer to) Figure 2 The cam slides 41a and 41b move downwards, causing them to move toward the punch 31.

[0122] Therefore, as Figure 4B As shown, the dies 32a and 32B, which are mounted on the cam drives 43a and 43b, are close to the punch 31.

[0123] Specifically, the second corners 68a and 68b of the dies 32a and 32b move in a manner close to the first corners 58a and 58b of the punch 31.

[0124] Furthermore, the fifth walls 37a and 37b of the compression blocks 34a and 34b respectively press the outer ends 28a and 28b of the flanges 25a and 25b of the preform 20 toward the first corners 58a and 58b of the punch 31.

[0125] In addition, the punches 32a and 32b (compression blocks 34a and 34b) that press the flanges 25a and 25b, the cam mechanism 40, and the lifting mechanism 39 constitute the "first pressing mechanism" described in the technical solution.

[0126] (Third process)

[0127] Next, the third process of the sidewalls 23a and 23b of the compression preform 20 (the first section edge-cap-shaped curved plate) will be described.

[0128] In this third process, such as Figure 4C As shown, a gap G is formed between the punch 31 and the top 24 of the preform 20.

[0129] The gap G is formed by compression blocks 34a and 34b respectively. Figure 4B The compression blocks 34a and 34b shown are formed by further pressing the outer ends 28a and 28b of the flanges 25a and 25b.

[0130] That is, such as Figure 4C As shown, the gap G is the clearance allowance for the preform 20, which is pressed into the die 32a (illustration of die 32b omitted) by the compression block 34a (illustration of die 32b omitted) between the punch and the punch 31, and is formed by the top 24 of the preform 20 lifting the seat 35a upward.

[0131] Then, in the lifting mechanism 39 (refer to...) Figure 2 ) so that the seat cushion support portion 35c is located at the position of the seat cushion 35a. Figure 4C When the shown state moves downward, the seat cushion 35a presses the top 24 of the pre-formed article downward using the non-retractable cushioning member 35b. As a result, the upper ends 29a and 29b of the sidewalls 23a and 23b are pressed toward the first corner 58 of the punch 31.

[0132] Thus, the seat cushion 35a and lifting mechanism 39 (see reference) press the upper ends 29a and 29b of the side walls 23a and 23b. Figure 2 This constitutes the "second pressing mechanism" described in the technical solution.

[0133] In this third process, cam drives 43a and 43b (refer to...) Figure 2 The lifting mechanism 39 (refer to) Figure 2 ) so that the seat cushion support part 35c (refer to) Figure 2 ) moves downwards. Therefore, as Figure 4D As shown, the dies 32a and 32b, mounted on the cam sliders 41a and 41b, move such that the second corner portions 68a and 68b approach the first corner portions 58a and 58b of the punch 31. Therefore, the sidewalls 23a and 23b and the flanges 25a and 25b of the preform 20 (the first section edge-cap-shaped curved plate) are compressed between the preform 20 and the punch 31.

[0134] Furthermore, in the stamping method of this embodiment, the second process is performed in parallel with the third process, and in the third process, compression is performed between the dies 32a and 32b and the punch 31. Figure 4D The sidewalls 23a, 23b and flanges 25a, 25b of the preform 20 shown are pressed toward the first corner 58 of the punch 31 in the second process. Figure 4B The outer ends 28a and 28b of the flanges 25a and 25b of the preform 20 shown.

[0135] In other words, such as Figure 4D As shown, on the punch 31, a preform 20 (with a first cross-section of a bendable plate with a cap-like shape along the edge) having a circumference longer than that of the punch 31 is pressed in such a way that the excess length is eliminated in accordance with the circumference of the punch 31.

[0136] As a result, the flanges 25a, 25b and sidewalls 23a, 23b of the preform 20 are compressed in-plane along the perimeter of the edge cap-shaped preform 20.

[0137] And, as Figure 4E As shown, the flanges 25a and 25b and the sidewalls 23a and 23b, which are compressed in-plane, form flanges 15a and 15b and sidewalls 13a and 13b, respectively, and form a stamped product 10 in a mold consisting of a punch 31, a die 32a and 32b and a seat 35a.

[0138] [Effects]

[0139] Next, the effects of the stamping forming method and stamping forming apparatus 30 in this embodiment will be explained.

[0140] In the stamping forming method of this embodiment, the stamped product 10 (a bent plate with a second cross section in the shape of a hat along the edge) is obtained by compressing the sidewalls 23a, 23b and flanges 25a, 25b of the pre-formed product 20 (a bent plate with a first cross section in the shape of a hat along the edge) in the plane.

[0141] According to this stamping method, when the sidewalls 23a, 23b and flanges 25a, 25b are compressed in-plane along the perimeter of the edge cap, the stress generated in the curved portion of the edge cap is offset. Therefore, the stamping method in this embodiment, unlike conventional stamping methods based on conventional deep drawing (for example, see Patent Document 1), can eliminate the springback generated by the pre-formed article 20 through a simple process such as compression forming.

[0142] Moreover, the stamped product 10 obtained by this stamping method has excellent dimensional accuracy because springback is suppressed.

[0143] Furthermore, in the stamping forming method of this embodiment, in parallel with the third step of compressing the sidewalls 23a, 23b and flanges 25a, 25b of the preform 20 between the die 32 and the punch 31, a second step is performed to press the outer ends 28a, 28b of the flanges 25a, 25b of the preform 20 toward the first corner 58 of the punch 31.

[0144] According to this stamping method, in-plane compression can be applied to the sidewalls 23a, 23b and flanges 25a, 25b of the preformed article 20 (a plate with a first cross-section that is bent in the shape of a hat along the edge) with a simpler process.

[0145] The stamping forming apparatus 30 of this embodiment includes: a compression mechanism, which is composed of a die 32a, 32b for compressing the side walls 23a, 23b and flanges 25a, 25b of the preformed article 20 and a punch 31; a first pressing mechanism for pressing the outer ends 28a, 28b of the flanges 25a, 25b; and a second pressing mechanism for pressing the upper ends 29a, 29b of the side walls 23a, 23b.

[0146] According to such a stamping forming apparatus 30, the above-mentioned stamping forming method can be achieved, and the above-mentioned stamping forming method can be implemented with a simple structure.

[0147] In the stamping forming apparatus 30 of this embodiment, the first pressing mechanism and the second pressing mechanism are linked together via the cam mechanism 40.

[0148] With this stamping forming apparatus 30, the control of the simultaneous pressing of the outer ends 28a and 28b of the flanges 25a and 25b and the pressing of the upper ends 29a and 29b of the sidewalls 23a and 23b during the compression of the flanges 25a and 25b and the sidewalls 23a and 23b becomes simple. As a result, the in-plane compression of the flanges 25a and 25b and the sidewalls 23a and 23b can be performed more accurately.

[0149] In the stamping forming apparatus 30 of this embodiment, the first pressing mechanism has fifth wall surfaces 37a and 37b. These fifth wall surfaces 37a and 37b approach the outer end surfaces 36a and 36b of the punch 31 as the second corners 68a and 68b of the dies 32a and 32b approach the first corners 58a and 58b of the punch 31. That is, the fifth wall surfaces 37a and 37b of the compression blocks 34a and 34b constituting the first pressing mechanism are integrally formed with the die bodies 33a and 33b to constitute the dies 32a and 32b.

[0150] According to such a stamping forming apparatus 30, a compression mechanism consisting of dies 32a, 32b and punch 31 can be linked with a first pressing mechanism that presses the outer ends 28a, 28b of flanges 25a, 25b.

[0151] This simplifies the structure of the compression mechanism and the first pressing mechanism, enabling the stamping forming device 30 to be made more compact.

[0152] In the stamping forming apparatus 30 of this embodiment, the second pressing mechanism presses the seat 31c of the top 31c of the preform 20 when the second corners 68a and 68b of the dies 32a and 32b are relatively close to the first corners 58a and 58b of the punch 31.

[0153] According to such a stamping forming apparatus 30, the compression mechanism consisting of dies 32a, 32b and punch 31 can be linked with the first pressing mechanism consisting of seat cushion 35c.

[0154] This simplifies the structure of the compression mechanism and the second pressing mechanism, enabling the stamping forming device 30 to be made more compact.

[0155] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0156] Figure 5A This is a structural illustration of a first modified example of the stamping forming apparatus 30. Figure 5B yes Figure 5A The first modified example of the stamping forming device 30 is illustrated in the operation diagram.

[0157] like Figure 5A As shown, in the first modified example, the punch 31 of the stamping forming apparatus 30 is divided into an upper punch 311 and a lower punch 312.

[0158] Furthermore, a lifting device 313 is disposed between the upper punch 311 and the lower punch 312. Incidentally, the lifting device 313 is composed of a buffer member such as a coil spring.

[0159] The lifting device 313 is configured such that, during operation Figure 4A In the first process shown, the upper punch 311, which holds the top 24 of the preformed article 20, is lifted upward by force with a predetermined gap between it and the seat cushion 35a.

[0160] Furthermore, the stamping forming apparatus 30 of the first modified example is as follows: Figure 5B As shown, when the seat cushion 35a overcomes the force of the lifting device 313 and presses down the top 24 of the pre-formed article 20, the gap between the upper punch 311 and the lower punch 312 disappears.

[0161] Therefore, when the sidewalls 23a, 23b and flanges 25a, 25b are compressed between the punch 31 and the die 32a, 32b, the seat 35a presses the upper ends 29a and 29b of the sidewalls 23a and 23b toward the first corners 58a and 58b of the punch 31.

[0162] According to this first modified example of the stamping forming apparatus 30, since the amount of pressing down of the upper ends 29a and 29b generated by the seat pad 35a can be specified by the gap between the upper punch 311 and the lower punch 312, the amount of pressing down can be quantified.

[0163] In addition, Figure 5B In the attached diagram, reference numerals 34a and 34b indicate compressed blocks.

[0164] In addition, the stamping forming apparatus 30 of the above embodiment (refer to Figure 3 The first walls 53a and 53b of the punch 31 are tilted such that the distance between them gradually narrows as they face upwards, but there are no particular restrictions on the relative tilt of the first walls 53a and 53b.

[0165] That is, in the stamping forming apparatus 30, since the compression blocks 34a and 34b are arranged on the sides of the dies 32a and 32b, the first wall surfaces 53a and 53b can be positioned relative to each other. Figure 3 The stamping forming apparatus 30 shown in the front view is parallel to each other, and can also be parallel to each other. Figure 3 The first wall surfaces 53a and 53b shown are, on the contrary, undercut.

[0166] Incidentally, the first wall surfaces 53a and 53b, which become the undercut surfaces, can be formed as intended.

[0167] Furthermore, although the illustrations are omitted, ensuring the accuracy of stamped products with straight or near-straight walls inevitably relies on a die with an undercut shape, a process impossible in existing stamping apparatuses. In contrast, the stamping apparatus 30 of this embodiment, through the combination of the cam mechanism 40 and the compression blocks 34a, 34b, can realize a structure using a die with such an undercut shape.

[0168] In the stamping method of the above embodiment, a pre-formed article 20 is prepared, the sidewalls 23a and 23b of which are longer than the sidewalls 13a and 13b of the stamped article 10. However, the pre-formed article 20 is not limited to this.

[0169] That is, in the stamping forming method of the present invention, as described above, when the second process is performed in parallel with the third process, it is sufficient to provide a pre-formed article 20 on the punch 31 with a circumference longer than that of the punch 31. Therefore, the lengths of the flanges 25a and 25b of the pre-formed article 20 are, in principle, set to be the same as the lengths of the flanges 15a and 15b of the stamped article 10, as described above. Provided that the circumference of the pre-formed article 20 is longer than the circumference of the punch 31, the lengths of the flanges 25a and 25b can be relative to the stamped article 10 (see...). Figure 1 The lengths of flanges 15a and 15b are slightly increased or decreased.

[0170] Explanation of reference numerals in the attached figures

[0171] 10 Stamped Parts

[0172] 11 raised parts

[0173] 12. Hat brim

[0174] 13a sidewall

[0175] 13b sidewall

[0176] 14 Top

[0177] 15a, 15b flanges

[0178] 16 horizontal walls

[0179] 18 convex surfaces

[0180] 19 concave surfaces

[0181] 20 Pre-formed products

[0182] 23a, 23b sidewalls

[0183] 24 Top

[0184] 25a, 25b flanges

[0185] 28a, 18b outer ends

[0186] The upper ends of 29a and 29b

[0187] 30 stamping forming device

[0188] 31 punch

[0189] 31a Base Section

[0190] 31b protrusion

[0191] 31c top

[0192] 32 punching die

[0193] 32a stamping die

[0194] 32b stamping die

[0195] 33a Die Body

[0196] 33b die body

[0197] 34 Compressed blocks

[0198] 34a compressed block

[0199] 34b compressed block

[0200] 35 seat cushion units

[0201] 35a seat cushion

[0202] 35b buffer component

[0203] 35c seat cushion support

[0204] 35d groove

[0205] 35e cylindrical space

[0206] 36a outer end face

[0207] 36b outer end face

[0208] 37 Fifth Wall

[0209] 37a Fifth wall

[0210] 37b Fifth Wall

[0211] 39 Lifting Mechanism

[0212] 40 cam mechanism

[0213] 41a Cam Slider

[0214] 41b Cam Slider

[0215] 42a Cam Base

[0216] 42b Cam Base

[0217] 43a, 43b Cam Drivers

[0218] 44a, 44b Cam surfaces

[0219] 45a inclined surface

[0220] 45b inclined surface

[0221] 46a Force-applying component

[0222] 47a Sliding Member

[0223] 53a First wall

[0224] 53b First wall

[0225] 55a Second wall

[0226] 55b Second Wall

[0227] 56 transverse wall surface

[0228] 57a Inclined wall

[0229] 57b Inclined wall

[0230] 58 First Corner

[0231] 58a First Corner

[0232] 58b First Corner

[0233] 63a Third wall

[0234] 63b Third wall

[0235] 65a Fourth wall

[0236] 65b Fourth Wall

[0237] 68a Second Corner

[0238] 68b Second Corner

[0239] 35d1 bottom surface

[0240] 35d2 side view

[0241] Ax central axis

[0242] G gap

[0243] Hp horizontal plane

[0244] S-spring

Claims

1. A method for manufacturing a stamped product, characterized in that, By compressing the first cross-section of the curved plate with an edge-cap-shaped shape in an in-plane manner between the first mold and the second mold, from the sidewall of the edge-cap-shaped raised portion in the first cross-section to the edge-cap-shaped flange along the circumferential direction of the edge-cap shape, a second cross-section curved plate with an edge-cap-shaped shape is obtained. The first mold is composed of a punch, wherein a first wall surface of the punch, formed in a manner corresponding to the sidewall of the second cross-section of the plate that is bent in a hat-like shape along the edge, and a second wall surface, formed in a manner corresponding to the flange of the second cross-section of the plate that is bent in a hat-like shape along the edge, are continuous to form a first corner. The second mold is composed of a punch, wherein a third wall surface parallel to the first wall surface and a fourth wall surface parallel to the second wall surface form a second corner and are continuous. The method for manufacturing the stamped product includes: In the first step, a sidewall with the first cross-section of a curved plate with an edge cap shape is disposed between the first wall surface and the third wall surface, and a flange with the first cross-section of a curved plate with an edge cap shape is disposed between the second wall surface and the fourth wall surface; The second step is to press the end of the flange of the first cross-section, which is a bendable plate with a side cap shape, opposite to the first corner side, towards the first corner side in a transverse direction orthogonal to the vertical direction. as well as In the third step, the first corner portion and the second corner portion are brought closer together in the lateral direction. Between the first wall surface and the third wall surface, and between the second wall surface and the fourth wall surface, the sidewalls and flanges of the first cross-section of the edge-cap-shaped curved plate are compressed. The second process is performed in parallel with the third process. The punch has an outer end face that intersects the second wall surface on the opposite side of the first corner. The fifth wall of the die is closer to the outer end face of the punch in the lateral direction as the first corner and the second corner are relatively close in the lateral direction.

2. A stamping forming apparatus, wherein a second cross-section of a bent plate with an edge-cap-shaped bend is obtained by compressing a first cross-section of the plate between a first die and a second die, characterized in that, The cross-section of the curved plate with an edge-cap-shaped profile includes: a sidewall formed to correspond to the edge-cap-shaped bulge and extending along the height direction of the bulge; and a flange formed to correspond to the edge-cap-shaped brim and extending from the end of the sidewall in an outward direction on the opening side of the bulge. The first mold is composed of a punch, wherein a first wall surface of the punch, formed in a manner corresponding to the sidewall of the second cross-section of the plate that is bent in a hat-like shape along the edge, and a second wall surface, formed in a manner corresponding to the flange of the second cross-section of the plate that is bent in a hat-like shape along the edge, are continuous to form a first corner. The second mold is composed of a punch, wherein a third wall surface parallel to the first wall surface and a fourth wall surface parallel to the second wall surface form a second corner and are continuous. The stamping forming apparatus includes: A compression mechanism brings the first corner close to the second corner, compressing the sidewall and flange of the first cross-section of the edge-cap-shaped curved plate between the first wall surface and the third wall surface, and between the second wall surface and the fourth wall surface; The first pressing mechanism presses the end of the flange of the first cross-section, which is a bendable plate with a side cap shape, opposite to the first corner side, in a transverse direction orthogonal to the vertical direction toward the first corner side. as well as The second pressing mechanism presses the end of the sidewall of the first cross-section, which is curved in a hat-like shape along the edge, opposite to the first corner side, toward the first corner side along the vertical direction. The punch has an outer end face that intersects the second wall surface on the opposite side of the first corner. The first pressing mechanism has a fifth wall surface that is closer in the lateral direction to the outer end face of the punch as the first corner and the second corner are relatively close in the lateral direction.

3. The stamping forming apparatus according to claim 2, characterized in that, The fifth wall surface is formed in the die.

4. The stamping forming apparatus according to claim 2, characterized in that, The second pressing mechanism is a seat cushion, which is configured to correspond to the top of the edge-cap-shaped curved plate with an edge-cap-shaped cross-section, and presses the top of the edge-cap-shaped plate toward the punch side when the first corner and the second corner are relatively close.

5. A stamping forming apparatus, wherein a second cross-section of a bent plate with an edge-cap-shaped bend is obtained by compressing a first cross-section of a bent plate with an edge-cap-shaped bend between a first die and a second die, characterized in that, The cross-section of the curved plate with an edge-cap-shaped profile includes: a sidewall formed to correspond to the edge-cap-shaped bulge and extending along the height direction of the bulge; and a flange formed to correspond to the edge-cap-shaped brim and extending from the end of the sidewall in an outward direction on the opening side of the bulge. The first mold is composed of a punch, wherein a first wall surface of the punch, formed in a manner corresponding to the sidewall of the second cross-section of the plate that is bent in a hat-like shape along the edge, and a second wall surface, formed in a manner corresponding to the flange of the second cross-section of the plate that is bent in a hat-like shape along the edge, are continuous to form a first corner. The second mold is composed of a punch, wherein a third wall surface parallel to the first wall surface and a fourth wall surface parallel to the second wall surface form a second corner and are continuous. The stamping forming apparatus includes: A compression mechanism brings the first corner close to the second corner, compressing the sidewall and flange of the first cross-section of the edge-cap-shaped curved plate between the first wall surface and the third wall surface, and between the second wall surface and the fourth wall surface; The first pressing mechanism presses the end of the flange of the first cross-section, which is a bendable plate with a side cap shape, opposite to the first corner side, in a transverse direction orthogonal to the vertical direction toward the first corner side. as well as The second pressing mechanism presses the end of the sidewall of the first cross-section, which is curved in a hat-like shape along the edge, opposite to the first corner side, toward the first corner side along the vertical direction. The first pressing mechanism and the second pressing mechanism are linked by a cam mechanism. The cam mechanism is sandwiched between the first pressing mechanism and the second pressing mechanism. During the movement of the second pressing mechanism toward the punch side in the vertical direction, the second pressing mechanism causes the first pressing mechanism to move laterally toward the punch via the cam mechanism.

Images