Press processing method, press die, and press processed product

Abstract

To provide a press processing method and a press die which can press an edge into a desired shape.SOLUTION: A press processing method according to the present disclosure, which processes a blank material into a press-processed product, includes: a step of processing a plate-like blank material into an intermediate processed product which has a bottom part, a side wall and a connection part between the bottom part and the side wall and which is larger in height of a side wall than the press-processed product, with a drawing die; and a step of processing the intermediate processed product into the press-processed product in a predetermined shape, by compressing the side wall of the intermediate processed product in a height direction to flow a material of the side wall to the connection part and then forming the connection part of the intermediate processed product into a predetermined edge shape, using an edge press die which comprises an edge press punch, an edge press die, an edge press pad and an end face support for supporting an end face of the side wall of the intermediate processed product, with the edge press punch, the edge press die, the edge press pad and the end face support surrounding the intermediate processed product.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a press working method, a press die, and a pressed product. [Background technology]

[0002] Products such as rectangular cylindrical containers may be formed by pressing (drawing).

[0003] For example, in the sheet metal press processing method described in Patent Document 1, a blank sheet is drawn so that the corners protrude outward or inward, and in a subsequent process the protruding corners are pushed back to form a drawn product having the shape of a square cylindrical container. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2001-225113 A Summary of the Invention [Problem to be solved by the invention]

[0005] The sheet metal press working method described in Patent Document 1 still has room for improvement in terms of processing a pressed product into a predetermined edge shape.

[0006] Therefore, the present disclosure provides a press working method and a press worked product capable of processing a press worked product with a predetermined edge shape, and a press worked product formed with the predetermined edge shape. [Means for solving the problem]

[0007] A press working method according to one embodiment of the present disclosure includes: A press working method for processing a blank material into a press-worked product having a predetermined shape, comprising the steps of: A step of processing the plate-shaped blank material into an intermediate product using a drawing die, the intermediate product having a bottom, one or more side walls extending in a height direction from an outer edge of the bottom, and a connecting portion that connects the bottom and the one or more side walls and is curved round, the height of the one or more side walls being greater than that of the press product of the predetermined shape; an edge press die including an edge press punch having a press surface, an edge press die having a hollow portion into which the edge press punch is inserted, an edge press pad disposed in the hollow portion of the edge press die, and an end face presser supporting an end face of the one or more side walls of the intermediate product, wherein the intermediate product is surrounded by the edge press punch, the edge press die, the edge press pad, and the end face presser, and the one or more side walls of the intermediate product are compressed in a height direction to cause material of the one or more side walls to flow into the connecting portion, thereby forming the connecting portion of the intermediate product into a predetermined edge shape, thereby processing the intermediate product into the pressed product of the predetermined shape; Includes.

[0008] A press die according to one embodiment of the present disclosure includes: A press die for forming an intermediate product processed from a blank material into a press product having a predetermined shape, an edge press punch having a press surface; An edge press die having a hollow portion into which the edge press punch is inserted; An edge press pad disposed in a hollow portion of the edge press punch; an end surface holder that supports end surfaces of one or more side walls of the intermediate product, the end surface holder having a bottom, one or more side walls extending in a height direction from an outer edge of the bottom, and a connecting portion that connects the bottom and the one or more side walls and is rounded and curved, the one or more side walls having a height greater than that of the press product of the predetermined shape; Equipped with The edge press punch, the edge press die, the edge press pad, and the end face holder are configured to surround the intermediate workpiece and compress the one or more side walls of the intermediate workpiece in the height direction, thereby forming the connection portion of the intermediate workpiece into a predetermined edge shape, thereby forming the intermediate workpiece into the press product of the predetermined shape.

[0009] A press-processed product according to one embodiment of the present disclosure includes: A pressed product having a bottom portion, a side wall, and a connecting portion connecting the bottom portion and the side wall, The surface roughness of the surface of the connection portion is 0.5 μm or less, The edge constituting the connection portion is a curved surface having a radius of 0.2 mm or less. Effect of the Invention

[0010] The present invention provides a press working method and press die capable of processing a press worked product having a predetermined edge shape, and a press worked product formed in the predetermined edge shape. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic cross-sectional view showing a press processing device equipped with a drawing die according to a first embodiment of the present disclosure. [Diagram 2] FIG. 1 is a schematic cross-sectional view showing a press processing device equipped with an edge press die according to a first embodiment of the present disclosure. [Diagram 3] 1 is a flowchart illustrating a press working method according to a first embodiment of the present disclosure. [Figure 4A] FIG. 1 is a schematic plan view showing a blank material that is used as a material for a pressed product. [Figure 4B] Schematic side view showing a blank material that is the material for the pressed product. [Diagram 5] Schematic diagram illustrating the process of forming a blank into a workpiece. [Figure 6] Schematic diagram illustrating the process of forming a blank into a workpiece. [Figure 7A]FIG. 1 is a schematic plan view showing a formed intermediate product; [Figure 7B] FIG. 1 is a schematic side view showing a formed intermediate product; [Figure 7C] An enlarged view of region R1 in FIG. 7B. [Figure 8A] Schematic diagram illustrating the process of forming an intermediate workpiece into a pressed workpiece. [Figure 8B] An enlarged view of region R2 in FIG. 8A. [Figure 9] FIG. 1 is a schematic diagram illustrating a process of forming an intermediate product 2 into a press product. [Figure 10] FIG. 1 is a schematic diagram illustrating a process of forming an intermediate product 2 into a press product. [Figure 11A] FIG. 1 is a schematic plan view showing a formed press product; [Figure 11B] FIG. 1 is a schematic side view showing a formed press product. [Figure 12] FIG. 1 is a schematic cross-sectional view showing an edge press die according to a modified example of the first embodiment. [Figure 13] FIG. 11 is a schematic cross-sectional view showing an edge press die according to another modified example of the first embodiment. [Figure 14A] FIG. 11 is a schematic plan view showing a blank material according to a second embodiment; [Figure 14B] FIG. 11 is a schematic side view showing a blank material according to a second embodiment; [Figure 15A] FIG. 11 is a schematic plan view showing an intermediate product according to a second embodiment; [Figure 15B] FIG. 11 is a schematic side view showing an intermediate product according to a second embodiment; [Figure 16] FIG. 11 is a schematic cross-sectional view showing a press processing device equipped with an edge press die according to a third embodiment. [Figure 17] 17 is a schematic cross-sectional view illustrating a process of forming a pressed product using the edge press die of FIG. [Figure 18] FIG. 13 is a schematic cross-sectional view illustrating a process of forming a pressed product using an edge press die according to a fourth embodiment. [Figure 19] FIG. 13 is a schematic cross-sectional view illustrating a process of forming a pressed product using an edge press die according to a fourth embodiment. [Figure 20]FIG. 13 is a schematic cross-sectional view illustrating a process of forming a pressed product using an edge press die according to a fourth embodiment. [Figure 21] 13 is a schematic cross-sectional view illustrating a process of forming a pressed product using an edge press die according to a fifth embodiment. [Figure 22] 13 is a schematic cross-sectional view illustrating a process of forming a pressed product using an edge press die according to a fifth embodiment. [Diagram 23] 13 is a schematic cross-sectional view illustrating a process of forming a pressed product using an edge press die according to a fifth embodiment. [Figure 24] FIG. 13 is a schematic perspective view of a press-formed product according to a sixth embodiment. [Diagram 25] Sectional view of the pressed product shown in Figure 24 taken along line AA DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] (Background to this disclosure) 2. Description of the Related Art A plate-shaped blank material may be formed into a pressed product having a bottom by drawing using a press processing device.

[0013] In the sheet metal press processing method described in Patent Document 1, when a base plate is drawn, the corners are formed to protrude outward or inward, and in a subsequent process the corners are pushed back to form a drawn product having the shape of a square cylindrical container.

[0014] However, in the sheet metal press processing method described in Patent Document 1, when the portion connecting the bottom and the side wall is extended, an undercut shape is formed, which makes it difficult to remove from the mold. Therefore, there is a problem that it is difficult to form the portion connecting the bottom and the side wall into a predetermined edge shape.

[0015] Therefore, the inventors have studied a press processing method and press die capable of processing a press-processed product with a predetermined edge shape, as well as a press-processed product in which the connection portion connecting the bottom and side wall is formed with a predetermined edge shape, and have arrived at the following invention.

[0016] A press working method according to one embodiment of the present disclosure includes: A press working method for processing a blank material into a press-worked product having a predetermined shape, comprising the steps of: A step of processing the plate-shaped blank material into an intermediate product using a drawing die, the intermediate product having a bottom, one or more side walls extending in a height direction from an outer edge of the bottom, and a connecting portion that connects the bottom and the one or more side walls and is curved round, the height of the one or more side walls being greater than that of the press product of the predetermined shape; an edge press die including an edge press punch having a press surface, an edge press die having a hollow portion into which the edge press punch is inserted, an edge press pad disposed in the hollow portion of the edge press die, and an end face presser supporting an end face of the one or more side walls of the intermediate product, wherein the intermediate product is surrounded by the edge press punch, the edge press die, the edge press pad, and the end face presser, and the one or more side walls of the intermediate product are compressed in a height direction to cause material of the one or more side walls to flow into the connecting portion, thereby forming the connecting portion of the intermediate product into a predetermined edge shape, thereby processing the intermediate product into the pressed product of the predetermined shape; Includes.

[0017] According to this configuration, it is possible to provide a press working method capable of processing a press-worked product having a predetermined edge shape.

[0018] The end face holder may be formed in a stepped shape toward the press surface on a side surface of the edge press punch.

[0019] According to this configuration, the generation of burrs in the pressed product can be suppressed.

[0020] The edge press die further includes a stripper arranged to surround a side surface of the edge press punch and to separate the pressed product from the edge press punch; The end face holder may be formed on the stripper.

[0021] According to this configuration, the generation of burrs can be suppressed, and the pressed product adhering to the edge press punch after press processing can be easily detached.

[0022] The step of processing into the press product includes: causing a material of at least one of the bottom and the one or more side walls of the intermediate workpiece to flow to the connection portion by one or more protrusions formed on at least one of the edge press punch, the edge press die, and the edge press pad;

[0043]

[0023] With this configuration, the material can be easily caused to flow to the connection between the bottom and the side wall, so that the connection can be easily formed into a predetermined edge shape.

[0024] The step of processing into the press product includes: Fluidizing the material at the bottom of the intermediate workpiece by an ejector cushion portion inserted into a hole formed in the press surface and connected to the edge press punch by an elastic member;

[0043]

[0025] According to this configuration, the ejector cushion allows the bottom material to escape into the hole formed in the press surface, preventing damage to the edge press die. Conversely, the ejector cushion allows the bottom material to flow into the connection part, making it easy to form the connection part into a predetermined edge shape.

[0026] The step of processing into the intermediate product includes: Processing the blank into the intermediate product such that the bottom portion has a polygonal shape and a side wall connection portion connecting the adjacent side walls is higher than other portions of the side walls;

[0043]

[0027] According to this configuration, when the bottom is polygonal, by increasing the height of the sidewall connection part, more material can flow to the connection part and the sidewall connection part, which makes it easy to form the connection part and the sidewall connection part into a predetermined edge shape.

[0028] The height of the edge press die defining the hollow portion may be greater than the height of the one or more side walls of the intermediate workpiece.

[0029] According to this configuration, the variation in height of the sidewall of the pressed product can be suppressed to within ±5%.

[0030] The width of the end face holder may be 0.7 to 1.3 times the thickness of the one or more side walls of the intermediate product.

[0031] According to this configuration, the length of the burrs generated on the end faces of the side walls of the intermediate product can be suppressed to 50% or less of the plate thickness of the pressed product.

[0032] A press die according to one embodiment of the present disclosure includes: A press die for forming an intermediate product processed from a blank material into a press product having a predetermined shape, an edge press punch having a press surface; An edge press die having a hollow portion into which the edge press punch is inserted; An edge press pad disposed in a hollow portion of the edge press punch; an end surface holder that supports end surfaces of one or more side walls of the intermediate product, the end surface holder having a bottom, one or more side walls extending in a height direction from an outer edge of the bottom, and a connecting portion that connects the bottom and the one or more side walls and is rounded and curved, the one or more side walls having a height greater than that of the press product of the predetermined shape; Equipped with The edge press punch, the edge press die, the edge press pad, and the end face holder are configured to surround the intermediate workpiece and compress the one or more side walls of the intermediate workpiece in the height direction, thereby forming the connection portion of the intermediate workpiece into a predetermined edge shape, thereby forming the intermediate workpiece into the press product of the predetermined shape.

[0033] According to this configuration, it is possible to provide a press die capable of forming the edge connecting the bottom and the side wall into a desired shape.

[0034] The end face holder may be formed in a stepped shape toward the press surface on a side surface of the edge press punch.

[0035] According to this configuration, the generation of burrs in the pressed product can be suppressed.

[0036] moreover, a stripper arranged to surround a side surface of the edge press punch and configured to separate the pressed product from the edge press punch; Equipped with The end face holder may be formed on the stripper.

[0037] According to this configuration, the generation of burrs can be suppressed, and the intermediate processed product adhering to the edge press punch after press processing can be easily peeled off.

[0038] The height of the edge press die defining the hollow portion may be greater than the height from the end face holder to the press surface of the edge press punch.

[0039] According to this configuration, the variation in height of the sidewall of the pressed product can be suppressed to within ±5%.

[0040] The height of the edge press die defining the hollow portion may be greater than the height of the one or more side walls of the intermediate workpiece.

[0041] According to this configuration, the intermediate workpiece can be reliably surrounded by the press die, and the predetermined edge shape can be easily formed while suppressing the generation of burrs.

[0042] The width of the end face holder may be 0.7 to 1.3 times the thickness of the one or more side walls of the intermediate product.

[0043] According to this configuration, the length of the burrs generated on the end faces of the side walls of the pressed product can be suppressed to 50% or less of the plate thickness of the pressed product.

[0044] At least one of the edge press punch, the edge press die, and the edge press pad may have one or more protrusions formed thereon.

[0045] According to this configuration, the protrusions allow the material of the bottom or sidewall to flow to the connection portion, making up for any shortage of material at the connection portion and making it easy to form a predetermined edge shape.

[0046] The height of the one or more protrusions may be less than the thickness of the intermediate workpiece.

[0047] According to this configuration, the shortage of material at the connection portion can be compensated for without damaging the pressed product, and the desired edge shape can be easily formed.

[0048] The edge press punch is The press surface has holes formed therein; The ejector may further include an ejector cushion portion that is inserted into the hole and connected by an elastic member.

[0049] According to this configuration, the ejector cushion section allows the bottom material to escape into the grooves formed on the press surface, preventing damage to the edge press die. Conversely, the ejector cushion section allows the bottom material to flow into the connection section, making it easy to form the connection section into a predetermined edge shape.

[0050] A press-processed product according to one embodiment of the present disclosure includes: A pressed product having a bottom portion, a side wall, and a connecting portion connecting the bottom portion and the side wall, The surface roughness of the surface of the connection portion is 0.5 μm or less, The edges constituting the connection have a radius of 0.2 mm or less.

[0051] According to this configuration, it is possible to provide a pressed product in which the connection portion connecting the bottom portion and the side wall is formed into a predetermined edge shape.

[0052] The press product is made of aluminum or an aluminum alloy. The tensile strength of the connection portion is 2.9% or more higher than that of the other portions, The connection portion may have a yield strength that is at least 6.9% greater than that of the other portions.

[0053] According to this configuration, it is possible to provide a pressed product in which the connection portion connecting the bottom portion and the side wall is formed into a predetermined edge shape.

[0054] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0055] (Embodiment 1) [Overall configuration] Fig. 1 is a schematic cross-sectional view showing a press processing apparatus 100 equipped with a drawing die 15 according to the first embodiment of the present disclosure. Fig. 2 is a schematic cross-sectional view showing the press processing apparatus 100 equipped with an edge press die 22 according to the first embodiment of the present disclosure. Fig. 3 is a flowchart for explaining a press processing method according to the first embodiment of the present disclosure.

[0056] As shown in Fig. 1, the press working apparatus 100 is equipped with a drawing die 15 and presses a plate-shaped blank 1 (see Figs. 4A and 4B) to form an intermediate product 2 (see Figs. 7A and 7B). As shown in Fig. 2, the press working apparatus 100 is equipped with an edge press die 22 and presses the intermediate product 2 formed using the drawing die 15 to form a press product 5 (see Figs. 11A and 11B). The edge press die 22 corresponds to the press die of the present disclosure.

[0057] The drawing die 15 and the edge press die 22 are fixed to a slide 16 and a bolster 17 of a press working device 100 via a die set upper die 19 and a die set lower die 18, and are mounted on the press working device 100. A guide bush 20 is fixed to the die set upper die 19, and a guide post 21 is fixed to the die set lower die 18. The guide bush 20 moves along the guide post 21, thereby enabling the die set upper die 19 to rise and fall while maintaining positional accuracy in the horizontal direction (the left-right direction in FIG. 1). In other words, the die set upper die 19 and the die set lower die 18 can move relatively in the pressing direction (the up-down direction in FIG. 1).

[0058] As shown in FIG. 1, the drawing mold 15 includes a drawing punch 6 and a drawing die 7 .

[0059] The drawing die 15 is mounted on the press working device 100 by fixing the drawing punch 6 to a lower die set 18 and the drawing die 7 to an upper die set 19 .

[0060] The drawing punch 6 is formed in a columnar shape and has a press surface 6a. In this embodiment, as described later, since the bottom 2b of the intermediate workpiece 2 is rectangular, the press surface 6a of the drawing punch 6 is formed in a rectangular prism shape. The press surface 6a of the drawing punch 6 may be changed according to the shape of the intermediate workpiece 2. The drawing die 7 is provided with a hollow portion 7a into which the drawing punch 6 is inserted. The hollow portion 7a is a hole formed in the drawing die 7 into which the drawing punch 6 is inserted. In other words, the drawing die 7 is formed in an annular shape having a rectangular hollow portion 7a.

[0061] As shown in FIG. 2, the edge press mold 22 includes an edge press punch 9, an edge press die 11, an edge press pad 12, and an end face holder 10.

[0062] The edge press punch 9 is formed in a columnar shape and has a press surface 9a. In this embodiment, as described later, since the bottom 5b of the pressed product 5 is rectangular, the press surface 9a of the edge press punch 9 is formed in a rectangular prism. The shape of the press surface 9a of the edge press punch 9 may be changed according to the shape of the pressed product 5. The edge press die 11 is provided with a hollow portion 11a into which the edge press punch 9 is inserted. The hollow portion 11a is a hole formed in the edge press die 11 into which the edge press punch 9 is inserted. That is, the edge press die 11 is formed in an annular shape having a rectangular hollow portion 11a. The edge press pad 12 is disposed in the hollow portion 11a of the edge press die 11.

[0063] The end face presser 10 supports the end face 8 of the side wall 2a of the intermediate product 2. In this embodiment, the end face presser 10 is formed in a stepped shape toward the press face 9a on the side face 9b of the edge press punch 9. Specifically, the end face presser 10 is formed on the side face 9b of the edge press punch 9 at a position lower than the press face 9a in the vertical direction of FIG. 2. The end face presser 10 is formed so as to go around the outer periphery of the press face 9a when the edge press punch 9 is viewed from above. In other words, the end face presser 10 is a surface formed in a frame shape when the edge press punch 9 is viewed from above. It is formed on the surface facing the edge press pad 12 among the parts protruding toward the outside (left and right direction in FIG. 2) on the side face 9b of the edge press punch 9.

[0064] The edge press die 22 is attached to the press processing device 100 by fixing the edge press punch 9 to the die set lower die 18, the edge press die 11 to the die set upper die 19, and the edge press pad 12 to the die set upper die 19 via a pad spring 23.

[0065] [Operation] With reference to Figs. 3 to 12, the operation of forming the press product 5 by the press device 100 will be described. Fig. 3 is a flow chart for explaining the operation of forming the press product 5. Fig. 4A is a schematic plan view showing the blank 1 which is the material of the press product 5. Fig. 4B is a schematic side view showing the blank 1 which is the material of the press product 5. Figs. 5 to 6 are schematic cross-sectional views for explaining the process of forming the blank 1 into the intermediate product 2. Figs. 5 to 6 show a cross section passing through a diagonal line (dashed line D1 in Fig. 4A) of the blank 1 when the blank 1 is placed in the drawing die 15. Fig. 7A is a schematic view showing the formed intermediate product 2. Fig. 7B is an enlarged view of the region R1 in Fig. 7A. Fig. 8A is a schematic cross-sectional view for explaining the process of forming the intermediate product 2 into the press product 5. Fig. 8A shows a cross section passing through a diagonal line (dashed line D2 in Fig. 7A) of the bottom 2b of the intermediate product 2 when the intermediate product 2 is placed in the edge press die 22. Fig. 8B is an enlarged view of region R2 in Fig. 8A. Figs. 9 and 10 are schematic cross-sectional views for explaining the process of forming the intermediate product 2 into the press product 5. Figs. 9 and 10 show a cross section passing through a diagonal line (dashed line D2 in Fig. 7A) of the bottom 2b of the intermediate product 2 when the intermediate product 2 is placed in the edge press die 22. Fig. 11A is a schematic plan view showing the formed press product 5. Fig. 11B is a schematic side view showing the formed press product 5.

[0066] First, as shown in FIG. 4A and FIG. 4B, a plate-shaped blank material 1 is prepared. The blank material 1 is a metal sheet such as aluminum or stainless steel. The blank material 1 can be obtained by cutting a metal sheet into a predetermined shape according to the size of the press-processed product 5, which is a finished product. As shown in FIG. 4A, in this embodiment, the blank material 1 is formed into a rectangular shape, and the four corners 1a are rounded. The shape of the blank material 1 is not limited to a rectangular shape, and may be a polygon such as an octagon. In addition, the four corners 1a of the blank material 1 may be rounded, formed at right angles (90 degrees), or chamfered. In addition, the four corners 1a of the blank material 1 may be formed, for example, in a wavy shape, that is, curved in a stepped shape.

[0067] Next, the blank material 1 is processed into the intermediate product 2 by the drawing die 15 (step S11 in FIG. 3). First, as shown in FIG. 5, the blank material 1 is placed on the drawing punch 6. Then, as shown in FIG. 6, the drawing die 7 is lowered to deform the blank material 1 while drawing it into the gap between the drawing punch 6 and the drawing die 7. In this manner, the blank material 1 can be formed into the intermediate product 2 by drawing.

[0068] As shown in Figs. 7A and 7B, the intermediate product 2 has a bottom 2b, four side walls 2a, and a connection portion 2c. The four side walls 2a extend in the height direction from the outer edge of the bottom 2b. In this embodiment, the bottom 2b of the intermediate product 2 is formed in a rectangular shape. The connection portion 2c connects the bottom 2b and the four side walls 2a and is formed in a round curve. The height h1 of each side wall 2a of the intermediate product 2 is greater than the height h2 (see Fig. 11B) of the side wall 5a of the pressed product 5 described later. In addition, when the blank 1 is processed by drawing as in step S11, the connection portion 2c of the intermediate product 2 is formed in a round curve with an R dimension greater than the plate thickness of the blank 1. The R dimension indicates the radius r1 of the curved surface forming the edge of the connection portion 2c, as shown in Fig. 7C.

[0069] Next, the intermediate workpiece 2 is surrounded by the edge press punch 9, edge press die 11, edge press pad 12, and end face holder 10 in the edge press mold 22, and the intermediate workpiece 2 is processed into a press workpiece 5 of a predetermined shape (step S12 in Figure 3).

[0070] As shown in FIG. 8A, the intermediate workpiece 2 is placed on the edge press punch 9. At this time, the intermediate workpiece 2 is placed on the edge press punch 9 so that the end surface 8 of the side wall 2a of the intermediate workpiece 2 is placed on the end surface presser 10. After the intermediate workpiece 2 is placed on the edge press punch 9, the edge press die 11 and the edge press pad 12 are lowered as shown in FIG. 9. When the edge press die 11 and the edge press pad 12 are lowered, the intermediate workpiece 2 is surrounded by the edge press punch 9, the edge press die 11, the edge press pad 12, and the end surface presser 10. In other words, the intermediate workpiece 2 is confined in a space closed by the edge press punch 9, the edge press die 11, the edge press pad 12, and the end surface presser 10.

[0071] In this state, as shown in Fig. 10, when the edge press die 11 and the edge press pad 12 are further lowered, each side wall 2a of the intermediate product 2 is compressed in the height direction (the up-down direction in Fig. 10). By compressing each side wall 2a in the height direction, the material of each side wall 2a flows to the connection portion 2c. In this way, by the edge press process in which the side walls 2a are compressed in the height direction in a closed space and the material of the side walls 2a flows to the connection portion 2c, the connection portion 34 of the pressed product 5 can be formed into a predetermined edge shape.

[0072] In this embodiment, edge press processing is performed while the intermediate processed product 2 is surrounded by the edge press die 22, so that the side wall connection portion 13 connecting adjacent side walls 5a of the pressed product 5 can also be formed into a predetermined edge shape, as shown in Figures 11A and 11B.

[0073] In this embodiment, being formed into a predetermined edge shape means that the angle of the connection portion 34 or the side wall connection portion 13 is formed at 90 degrees. Note that the connection portion 34 or the side wall connection portion 13 may be formed at an acute angle, a C-face may be formed on the connection portion 34 or the side wall connection portion 13, or an R-face may be formed on the connection portion 34 or the side wall connection portion 13. The C-face means that the edge of the connection portion 34 or the side wall connection portion 13 is chamfered. The R-face means that the edge of the connection portion 34 or the side wall connection portion 13 is formed to be rounded and curved.

[0074] By placing the end face 8 of the side wall 2a of the intermediate product 2 on the end holder 10 and pressing it, the end face 8 of the side wall 2a of the intermediate product 2 can be compressed while being pressed against the end holder 10. As a result, the end face 8 is made flat and level, and the variation in height of the side wall 5a of the pressed product 5 can be suppressed to within ±5%.

[0075] In addition, by performing edge press processing while the intermediate product 2 is surrounded by the edge press die 22, it is possible to prevent the material of the intermediate product 2 from flowing out of the space blocked by the edge press die 22. As a result, the length of the burr in the pressed product 5 can be reduced to 50% or less of the thickness of the side wall 2a of the intermediate product 2. The length of the burr can be further reduced by adjusting the size of the clearance between the edge press punch 9 and the edge press die 11. For example, if the clearance between the edge press punch 9 and the edge press die 11 is 5% or less of the thickness of the side wall 2a of the intermediate product 2, the length of the burr generated can be reduced to 30% or less of the thickness of the intermediate product 2.

[0076] In this manner, the pressed product 5 as shown in Figures 11A and 11B is completed. In this embodiment, as shown in Figure 11B, the bottom 5b of the pressed product 5 is formed in a rectangular shape, and the angle of the connection portion 34 between the bottom 5b and the side wall 5a is formed at 90 degrees. As described above, the height h2 of the side wall 5a of the pressed product 5 is smaller than the height h1 of the side wall 2a of the intermediate product 2.

[0077] Returning to FIG. 8A, the dimensions of the edge press die 22 will be described. The height H1 of the edge press die 11 that defines the hollow portion 11a is greater than the height h1 of the side wall 2a of the intermediate processed product 2. As shown in FIG. 8A, the height H1 of the edge press die 11 is the depth of the hollow portion 11a of the edge press die 11, and is the height of the inner wall of the edge press die 11 extending in the vertical direction of FIG. 8A. In this embodiment, since the end portion 14 of the edge press die 11 is rounded, the height H1 of the edge press die 11 is the height of the part of the inner wall of the edge press die 11 excluding the end portion 14, as shown in FIG. 8A.

[0078] By setting the relationship between the height H1 of the edge press die 11 and the height h1 of the side wall 2a of the intermediate product 2 in this way, the intermediate product 2 can be more reliably surrounded during edge press processing by the edge press mold 22. Therefore, the variation in the height of the side wall 5a of the pressed product 5 can be suppressed to within ±5%.

[0079] Further, the height H1 of the edge press die 11 that defines the hollow portion 11a is greater than the height L1 from the end face holder 10 to the press surface 9a of the edge press punch 9.

[0080] By setting the relationship between the height H1 of the edge press die 11 and the height L1 from the end face holder 10 to the press surface 9a of the edge press punch 9 in this manner, the intermediate processed product 2 can be securely surrounded by the edge press mold 22, and the desired edge shape can be easily formed while suppressing the occurrence of burrs.

[0081] 8B, the width w of the end surface holder 10 is 0.7 to 1.3 times the thickness t of the side wall 2a of the intermediate product 2. More preferably, the width w of the end surface holder 10 is 0.9 to 1.1 times the thickness of the side wall 2a of the intermediate product 2. Even more preferably, the width w of the end surface holder 10 and the thickness t of the side wall 2a of the intermediate product 2 are approximately the same.

[0082] By setting the relationship between the width w of the end surface clamp 10 and the thickness t of the side wall 2a of the intermediate workpiece 2 in this manner, the length of the burrs generated on the end surface 8 of the side wall 2a in the step of forming the intermediate workpiece 2 into a press-formed product 5 can be kept to 50% or less of the thickness t of the side wall 2a.

[0083] [effect] According to the above-described embodiment, it is possible to provide a press processing method and a press die capable of forming the connection portion 34 connecting the bottom portion 5b and the side wall 5a of the press-processed product 5 into a predetermined edge shape.

[0084] By edge-pressing the intermediate product 2 using the edge press die 22, the connection portion 34 can be formed into a predetermined edge shape.

[0085] By providing an end face holder 10 on the edge press punch 9 of the edge press die 22, the occurrence of burrs on the end face 8 of the side wall 2a of the intermediate product 2 can be suppressed.

[0086] The height H1 of the edge press die 11 that defines the hollow portion 11a is higher than the height h1 of the side wall 2a of the intermediate product 2, or higher than the height L1 from the end surface holder 10 to the press surface 9a of the edge press punch 9. Therefore, the variation in the height of the side wall 5a of the completed pressed product 5 can be suppressed to within ±5%.

[0087] Since the width w of the end surface clamp 10 is 0.7 to 1.3 times the thickness t of the side wall 2a of the intermediate workpiece 2, the length of the burr generated on the end surface 8 of the side wall 2a of the intermediate workpiece 2 can be kept to 50% or less of the thickness of the side wall 2a of the intermediate workpiece 2.

[0088] [Variations] In the above embodiment, the angle of the connection portion 34 of the press-formed product 5 is 90 degrees, but the edge shape of the connection portion 34 is not limited to this.

[0089] FIG. 12 is a schematic cross-sectional view showing an edge press die 22a according to a modified example of the first embodiment. As shown in FIG. 12, by using an edge press pad 12a with a chamfered corner, the connection part 34a of the pressed product 50 can be formed in a protruding shape. The connection part 34a is formed in a protruding shape so that the connection part 34a is formed so as to go around the edge of the bottom surface 50c from the bottom surface 50c of the pressed product 50 toward the outside. In other words, the connection part 34a is formed from the bottom surface 50c of the pressed product 50 toward the direction away from the bottom surface 50c (upward in FIG. 12). At this time, the connection part 34a is formed at an acute angle. The C surface of the corner of the edge press pad 12a can form the connection part 34a with an angle of 5 degrees or more and less than 90 degrees.

[0090] Fig. 13 is a schematic cross-sectional view showing an edge press die 22b according to another modified example of the embodiment 1. As shown in Fig. 13, by providing a protruding portion 11c with a protruding inner wall on the edge press die 11b, a C-surface can be formed in the connection portion 34b of the pressed product 51. The protruding portion 11c has a surface 11d extending in the vertical direction in Fig. 13 and an inclined flat surface 11e.

[0091] By forming the surface 11e of the protruding portion 11c into a curved surface, it is possible to form an R surface having an R dimension smaller than the plate thickness of the press-formed product 51 in the connecting portion 34b.

[0092] In the above embodiment, the bottom 2b of the intermediate product 2 is rectangular, but the shape of the bottom 2b of the intermediate product 2 is not limited to this. For example, the bottom 2b may be circular, elliptical, or other polygonal.

[0093] In the above embodiment, the drawing punch 6 and the edge press punch 9 are fixed to the die set lower die 18, and the drawing die 7 and the edge press die 11 are fixed to the die set upper die 19. However, the present invention is not limited to this. The drawing punch 6 or the edge press punch 9 may be fixed to the die set upper die 19.

[0094] In the above-described embodiment, an example has been described in which sheet metal such as aluminum or stainless steel is used as the blank piece 1, but the material of the blank piece 1 is not limited to aluminum or stainless steel as long as it is a metal.

[0095] (Embodiment 2) A second embodiment will be described with reference to Figures 14A to 15B. In the second embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. In the second embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0096] Fig. 14A is a schematic plan view showing a blank piece 201 according to the second embodiment. Fig. 14B is a schematic side view showing the blank piece 201 according to the second embodiment. Fig. 15A is a schematic plan view showing an intermediate product 202 according to the second embodiment. Fig. 15B is a schematic side view showing the intermediate product 202 according to the second embodiment. In the second embodiment, the shapes of the blank piece 201 and the intermediate product 202 are different from those in the first embodiment.

[0097] 14A and 14B, in the second embodiment, the radius of each of the four corners 201a of the blank piece 201 is smaller than the radius of each of the four corners 1a of the blank piece 1 in the first embodiment. By using such a blank piece 201, as shown in FIGS. 15A and 15B, the height of the side wall connection portion 203 that connects the four side walls 202a of the formed intermediate product 202 becomes higher than the other portions of the side walls 202a.

[0098] In this embodiment, the bottom 202b of the intermediate product 202 is rectangular, so that four side walls 202a are formed. The step of forming the intermediate product 202 includes processing the blank 201 into the intermediate product 202 so that the height h3 of the side wall connection portion 203 that connects the adjacent side walls 202a is higher than the height h4 of the other portions of the side walls 202a. Specifically, it is preferable to process the intermediate product 202 so that the height h3 of the side wall connection portion 203 is higher than the height h4 of the other portions of the side walls 202a and is equal to or less than twice the height h4 of the other portions of the side walls 202a.

[0099] The other portion of the side wall 202a is a portion where the height of the side wall 202a is smaller than the side wall connection portion 203, and refers to, for example, the central portion of the side wall 202a.

[0100] When the intermediate product 202 is edge-pressed using the edge press die 22, more material flows from the high sidewall connection portion 203 to the connection portion 202c than in other portions of the sidewall 202a.

[0101] [effect] According to the embodiment described above, during edge press processing, more material can be made to flow from the sidewall connection parts 203 to the connection parts 202c between the bottom part 202b and the sidewalls 202a. In particular, since more material is required to flow to the portions where the connection parts 202c and the sidewall connection parts 203 intersect, i.e., the four corners of the bottom part 202b, in order to form a predetermined edge shape, it is useful to use the intermediate processed product 202 as in this embodiment.

[0102] In addition, when performing press processing using the edge press die 22, a large amount of material can be made to flow at the connection portion 202c with a low load, thereby reducing the load on the die. Furthermore, a pressed product with a predetermined edge shape can be easily formed from a blank material with higher rigidity and a large processing load.

[0103] (Embodiment 3) A third embodiment will be described with reference to Fig. 16 and Fig. 17. In the third embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. In the third embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0104] Fig. 16 is a schematic cross-sectional view showing a press working apparatus 100 equipped with an edge press die 122 according to the third embodiment. Fig. 17 is a schematic cross-sectional view illustrating a process of forming a press product 5 using the edge press die 122 of Fig. 16.

[0105] In embodiment 3, as shown in FIG. 16, the edge press die 122 further includes a stripper 24 arranged to surround the side of the edge press punch 109, and differs from embodiment 1 in that an end face holder 110 is formed on the stripper 24.

[0106] The stripper 24 serves to separate the pressed product 5 from the edge press punch 109 after the intermediate product 2 has been pressed by the edge press die 122. The stripper 24 is fixed to the die set lower die 18 via a stripper spring 25.

[0107] 17, in this embodiment, the intermediate product 2 is placed on an edge press punch 109 so that the end surface 8 of the side wall 2a of the intermediate product 2 is placed on an end surface presser 110 formed on the stripper 24. In this state, the edge press die 11 is lowered to perform edge press processing.

[0108] After edge press processing, the pressed product 5 may adhere to the edge press punch 109. In this case, the restoring force of the stripper spring 25 pushes up the stripper 24, so that the pressed product 5 can be pushed out of the edge press punch 109.

[0109] In this embodiment, the end surface presser 110 is formed on the stripper 24. Specifically, the end surface presser 110 is formed by forming a portion along the side surface of the edge press punch 109 of the stripper 24 in a protruding shape. The end surface presser 110 is the convex surface of the convex portion 24a formed so as to protrude from the upper surface of the stripper 24. The convex portion 24a is provided on the upper surface of the stripper 24 on the inner wall side.

[0110] [effect] According to the above-described embodiment, the generation of burrs can be suppressed, and the pressed product adhering to the edge press punch after press working can be easily detached.

[0111] Since the stripper 24 is formed with an end face presser 110, when the stripper 24 is pushed up, a force is applied to the end face 8 of the pressed product 5, and the pressed product 5 can be separated from the edge press punch 109. At this time, since it is the end face 8 that is applied with the force to the pressed product 5, it is possible to prevent the pressed product 5 from having poor appearance such as dents.

[0112] (Embodiment 4) A fourth embodiment will be described with reference to Fig. 18 to Fig. 20. In the fourth embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. In the fourth embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0113] 18 to 20 are schematic cross-sectional views illustrating a process of forming a press product 5 using an edge press die 123 according to the fourth embodiment.

[0114] The fourth embodiment differs from the first embodiment in that a protrusion 27 is formed on a press surface 119a of an edge press punch 119, as shown in FIG.

[0115] In this embodiment, the protrusion 27 is formed as an annular protrusion along the outer edge of the press surface 119a of the edge press punch 119. For example, a plurality of protrusions 27 may be formed on the press surface 119a. The protrusions 27 are formed so that their height is smaller than the plate thickness of the blank 1.

[0116] In this embodiment, first, as shown in Fig. 18, the intermediate product 2 is placed on the edge press punch 119 so that the end surface 8 of the side wall 2a of the intermediate product 2 is placed on the end surface presser 10. In this state, as shown in Fig. 19, the edge press die 11 is lowered to perform edge press processing.

[0117] As shown in FIG. 20, when the edge press die 11 descends, the side wall 2a of the intermediate product 2 is compressed in the height direction while the intermediate product 2 is surrounded by the edge press mold 123. At this time, the material of the bottom 2b of the intermediate product 2 is caused to flow to the connection portion 2c. Specifically, the protrusion 27 is pressed into the bottom 2b of the intermediate product 2, so that the material of the bottom 2b of the intermediate product 2 can be caused to flow toward the connection portion 2c. Therefore, the material of the side wall 2a and the material of the bottom 2b flow into the connection portion 2c. In this way, more material can be caused to flow to the connection portion 2c. As a result, the connection portion 34 of the pressed product 5 can be easily formed into a predetermined edge shape.

[0118] [effect] According to the embodiment described above, the protrusions 27 allow the material of the bottom portion 2b of the intermediate product 2 to flow to the connecting portion 2c. This makes it possible to compensate for the shortage of material in the connecting portion 2c and easily form a desired edge shape.

[0119] In the above embodiment, an example in which a protrusion is formed on the press surface 119a of the edge press punch 119 has been described, but the protrusion may be formed on either the edge press die 11 or the edge press pad 12. In this case, at least one of the material of the bottom 2b and the side wall 2a of the intermediate product 2 flows to the connection portion 2c during edge press processing. Even when the protrusion is formed on the edge press die 11 or the edge press pad 12, the same effect as when the protrusion is formed on the press surface 119a of the edge press punch 119 can be achieved.

[0120] (Embodiment 5) A fifth embodiment will be described with reference to Fig. 21 to Fig. 23. In the fifth embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. In the fifth embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0121] 21 to 23 are schematic cross-sectional views illustrating a process of forming a press product 5 using an edge press die 124 according to the fifth embodiment.

[0122] The fifth embodiment differs from the first embodiment in that an edge press punch 129 has an ejector cushion portion 29 .

[0123] 21, the ejector cushion portion 29 is inserted into a hole 30 formed in the press surface 129a of the edge press punch 129. The ejector cushion portion 29 is connected to the edge press punch 129 by an elastic member 31. Specifically, the ejector cushion portion 29 is formed by connecting a pin 32 to the edge press punch 129 by the elastic member 31 inside the hole 30 formed in the press surface 129a.

[0124] In this embodiment, first, as shown in Fig. 21, the intermediate product 2 is placed on the edge press punch 129 so that the end surface 8 of the side wall 2a of the intermediate product 2 is placed on the end surface presser 10. In this state, as shown in Fig. 22, the edge press die 11 is lowered to perform edge press processing.

[0125] As shown in FIG. 23, the edge press die 11 descends, and the intermediate product 2 is surrounded by the edge press punch 129, the edge press die 11, the edge press pad 12, and the end face presser 10. At this time, the material at the bottom 2b of the intermediate product 2 is caused to flow. Specifically, for example, due to variations in the thickness of the blank material, more material than expected may be blocked, and the pressure on the edge press punch 129, the edge press die 11, or the edge press pad 12 may exceed a predetermined value. In this case, in the ejector cushion section 29, the elastic member 31 inserted into the hole 30 is deflected, and the pin 32 moves toward the inside of the hole 30 accordingly.

[0126] As a result, the material of the bottom 2b of the intermediate product 2 can be caused to flow toward the hole 30 and released. By causing the material of the bottom 2b to flow toward the hole 30, a protrusion 5d is formed on the inner bottom 5b of the press product 5. By causing the material of the bottom 2b of the intermediate product 2 to flow toward the hole 30, the pressure on the edge press die 124 can be released and damage to the edge press die 124 can be prevented.

[0127] Conversely, if less material than expected is blocked due to variations in the thickness of the blank, the elastic force of the elastic member 31 can cause the pin 32 to jump out of the hole 30 toward the press surface 129a, forming a recess in the bottom 2b of the intermediate product 2. In this case, forming a recess allows the material in the bottom 2b to flow toward the connecting portion 2c, making up for the lack of material in the connecting portion 2c.

[0128] [effect] According to the embodiment described above, the ejector cushion portion 29 allows the material of the bottom portion 2b of the intermediate product 2 to escape to the hole 30 formed in the press surface 129a. As a result, damage to the edge press die 124 can be prevented.

[0129] Conversely, by forming a recess in the bottom 2b of the intermediate product 2 using the ejector cushion portion 29, the material of the bottom 2b can flow to the connecting portion 2c. As a result, the pressure on the edge press die 124 can be released, and damage to the edge press die 124 can be prevented. In addition, a shortage of material can be supplemented, and the connecting portion 2c can be easily formed into a predetermined edge shape.

[0130] (Embodiment 6) A sixth embodiment will be described with reference to Fig. 24 and Fig. 25. In the sixth embodiment, a press-worked product 5 formed using the press working method and press die described in the first to fifth embodiments will be described.

[0131] Fig. 24 is a schematic perspective view of a pressed product 52 according to the sixth embodiment. Fig. 25 is a cross-sectional view taken along line AA of the pressed product 52 in Fig. 24.

[0132] As shown in Fig. 24 and Fig. 25, the pressed product 52 has a bottom 52b, a side wall 52a, and a connection portion 134 that connects the bottom 52b and the side wall 52a. In this embodiment, the bottom 52b of the pressed product 52 is rectangular, so the pressed product 52 has four side walls 52a. A C-face is formed between the connection portion 134 and the side wall connection portion 113 that connects the adjacent side walls 52a. That is, as shown in Fig. 25, the connection portion 134 and the side wall connection portion 113 are chamfered at the corners by a length c1. The length c1 is 0.5 mm or less.

[0133] In addition, the edges constituting the connection portion 134 and the sidewall connection portion 113 have a radius of 0.2 mm or less. Specifically, as shown in Fig. 25, an edge E1 between the connection portion 134 and the bottom portion 52b and an edge E2 between the sidewall 52a and the connection portion 134 are formed to have a radius of 0.2 mm or less.

[0134] The pressed product 5 is manufactured by forming a blank material made of aluminum or an aluminum alloy such as A5052-O, A5052-H112, or A7075-T6.

[0135] The pressed product 52 has high mechanical strength in a region 135 along the connection portion 134 .

[0136] For example, when using a blank material made of A5052-O aluminum alloy having a tensile strength of 170 MPa and a yield strength of 65 MPa, the edge press working results in a tensile strength of 170 MPa and a yield strength of 70 MPa in region 135 of pressed product 52. In other words, the edge press working improves the tensile strength by about 2.9% and the yield strength by about 7.6%.

[0137] Similarly, when using a blank material made of A5052-H112 aluminum alloy having a tensile strength of 195 MPa and a yield strength of 110 MPa, the edge press working results in a tensile strength of 275 MPa and a yield strength of 125 MPa in region 135 of pressed product 52. In other words, the edge press working improves the tensile strength by about 41% and the yield strength by about 13%.

[0138] Furthermore, when using a blank material made of an A7075-T6 aluminum alloy having a tensile strength of 510 MPa and a yield strength of 430 MPa, the edge press working results in a tensile strength of 530 MPa and a yield strength of 460 MPa in the region 135 of the pressed product 52. In other words, the edge press working improves the tensile strength by about 3.9% and the yield strength by about 6.9%.

[0139] In this way, by using aluminum or an aluminum alloy as the blank material, it is possible to improve the mechanical properties in region 135 of pressed product 52. Specifically, as described above, in region 135 of pressed product 52, the tensile strength is improved by 2% or more, or 40% or more depending on the material, and the yield strength is improved by 5% or more, or 10% or more depending on the material.

[0140] In addition, the density of the material in the region 135 of the pressed product 52 is about 1% or more higher than the density of the material in the other portions. This is because when the side walls of the intermediate product are compressed in the height direction during edge pressing, the material flows from the side walls to the connection portions.

[0141] In this manner, it is possible to provide the pressed product 52 in which the connection portion 134 connecting the bottom portion 52b and the side wall 52a is formed in a desired shape.

[0142] Furthermore, in the connection portion 134, the surface is smoothed by edge pressing, so that the surface roughness Ra is 0.5 μm or less. Therefore, the connection portion 134 can be made glossy.

[0143] [effect] According to the embodiment described above, it is possible to provide the pressed product 52 in which the connection portion 134 connecting the bottom portion 52b and the side wall 52a is formed in a desired shape.

[0144] In the above embodiment, an example has been described in which the chamfered connection 134 is formed between the bottom 52b and the side wall 52a of the pressed product 52, but the connection between the bottom 52b and the side wall 52a does not have to be chamfered. In that case, the connection between the bottom 52b and the side wall 52a has a radius of 0.2 mm or less. [Industrial Applicability]

[0145] The press working method and press die disclosed herein can form a press worked product having an edged bottom, and can be applied when manufacturing scanning knobs, wiring component covers, etc. for vehicles or home appliances by press working. [Explanation of symbols]

[0146] 1, 201 Blank material 2, 202 Intermediate processed products 2a, 202a side wall 2b, 202b bottom 2c, 202c connection 5, 51, 52 Pressed products 5a side wall 5b bottom 34, 34a, 34b Connections 5d protrusion 9, 109, 119, 129 Edge Press Punch 9a, 119a, 129a Press surface 10, 110 End clamp 11, 11b Edge press die 11a Hollow part 12, 12a Edge Press Pad 13, 203 Side wall connection 15 Drawing mold 22, 22a, 22b, 122, 123, 124 Edge press mold 24 Stripper 27 Protrusion 29 Ejector cushion part 30 holes 31 Elastic member

Claims

1. A press working method for processing a blank material into a press-worked product having a predetermined shape, comprising the steps of: A step of processing the plate-shaped blank material into an intermediate product having a bottom, one or more side walls extending in a height direction from an outer edge of the bottom, and a connecting portion that connects the bottom and the one or more side walls and is curved round, the height of the one or more side walls being greater than that of the press product of the predetermined shape, using a drawing die; an edge press die including an edge press punch having a press surface, an edge press die having a hollow portion into which the edge press punch is inserted, an edge press pad disposed in the hollow portion of the edge press die, and an end face presser supporting an end face of the one or more side walls of the intermediate product, wherein the intermediate product is surrounded by the edge press punch, the edge press die, the edge press pad, and the end face presser, and the one or more side walls of the intermediate product are compressed in a height direction to cause material of the one or more side walls to flow into the connecting portion, thereby forming the connecting portion of the intermediate product into a predetermined edge shape, thereby processing the intermediate product into the pressed product of the predetermined shape; Including, The step of processing into the intermediate product includes: Processing the blank into the intermediate product such that the bottom portion has a polygonal shape and a side wall connection portion connecting the adjacent side walls is higher than other portions of the side walls; Including, Press processing method.

2. A press working method for processing a blank material into a press-worked product having a predetermined shape, comprising the steps of: A step of processing the plate-shaped blank material into an intermediate product having a bottom, one or more side walls extending in a height direction from an outer edge of the bottom, and a connecting portion that connects the bottom and the one or more side walls and is curved round, the height of the one or more side walls being greater than that of the press product of the predetermined shape, using a drawing die; an edge press die including an edge press punch having a press surface, an edge press die having a hollow portion into which the edge press punch is inserted, an edge press pad fixed to a press processing device via a pad spring and disposed in the hollow portion of the edge press die, and an end face presser supporting an end face of the one or more side walls of the intermediate product, wherein the intermediate product is surrounded by the edge press punch, the edge press die, the edge press pad, and the end face presser, and the one or more side walls of the intermediate product are compressed in a height direction to cause material of the one or more side walls to flow into the connecting portion, thereby forming the connecting portion of the intermediate product into a predetermined edge shape, thereby processing the intermediate product into the pressed product of the predetermined shape; Including, The step of processing into the intermediate product includes: Processing the blank into the intermediate product such that the bottom portion has a polygonal shape and a side wall connection portion connecting the adjacent side walls is higher than other portions of the side walls; Including, Press processing method.

3. The end face pressing member is formed in a stepped shape toward the press surface on the side surface of the edge press punch. The press working method according to claim 1 or 2.

4. The edge press die further includes a stripper arranged to surround a side surface of the edge press punch and to separate the pressed product from the edge press punch; The end face holder is formed on the stripper. The press working method according to claim 1 or 2.

5. The step of processing into the press product includes: allowing material of at least one of the bottom and the one or more side walls of the intermediate workpiece to flow to the connection portion by one or more protrusions formed on at least one of the edge press punch, the edge press die, and the edge press pad; having The press working method according to any one of claims 1 to 4.

6. The step of processing into the press product includes: Fluidizing the bottom material of the intermediate workpiece by an ejector cushion portion inserted into a hole formed in the press surface and connected to the edge press punch by an elastic member; having The press working method according to any one of claims 1 to 5.

7. The height of the edge press die defining the hollow portion is greater than the height of the one or more side walls of the intermediate workpiece; The press working method according to any one of claims 1 to 6.

8. The width of the end face pressing portion is 0.7 to 1.3 times the thickness of the one or more side walls of the intermediate product. The press working method according to any one of claims 1 to 7.

9. A press die for forming an intermediate product processed from a blank material into a press product having a predetermined shape, an edge press punch having a press surface; An edge press die having a hollow portion into which the edge press punch is inserted; An edge press pad disposed in a hollow portion of the edge press die; an end surface holder that supports end surfaces of one or more side walls of the intermediate product, the end surface holder having a bottom, one or more side walls extending in a height direction from an outer edge of the bottom, and a connecting portion that connects the bottom and the one or more side walls and is rounded and curved, the one or more side walls having a height greater than that of the press product of the predetermined shape; Equipped with The edge press punch, the edge press die, the edge press pad, and the end face pressing device are configured to compress the one or more side walls of the intermediate product in a height direction while surrounding the intermediate product, thereby forming the connection portion of the intermediate product into a predetermined edge shape, thereby forming the intermediate product into the press product of the predetermined shape, The intermediate product has a polygonal bottom, and a side wall connection portion connecting the adjacent side walls is higher than other portions of the side walls. Press mold.

10. The end face pressing member is formed in a stepped shape toward the press surface on the side surface of the edge press punch. The press die according to claim 9.

11. moreover, a stripper arranged to surround a side surface of the edge press punch and configured to separate the pressed product from the edge press punch; Equipped with The end face holder is formed on the stripper. The press die according to claim 9 or 10.

12. The height of the edge press die defining the hollow portion is higher than the height from the end face pressing portion to the press surface of the edge press punch; A press die according to any one of claims 9 to 11.

13. The height of the edge press die defining the hollow portion is greater than the height of the one or more side walls of the intermediate workpiece; A press die according to any one of claims 9 to 12.

14. The width of the end face pressing portion is 0.7 to 1.3 times the thickness of the one or more side walls of the intermediate product. A press die according to any one of claims 9 to 13.

15. At least one of the edge press punch, the edge press die, and the edge press pad has one or more protrusions formed thereon; A press die according to any one of claims 9 to 14.

16. a height of the one or more protrusions is less than a thickness of the intermediate product; The press die according to claim 15.

17. The edge press punch is The press surface has holes formed therein; an ejector cushion portion inserted into the hole and connected by an elastic member; A press die according to any one of claims 9 to 16.

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