Press processing method and press processing equipment

Abstract

To suppress attaching of a punched residue having a substantially flat tabular shape to various parts in a processing step of a punched residue.SOLUTION: A press processing method includes a second step of forming a pierced hole H in a plate material P by punching a hole processing region R of the plate material P including a projection portion C by a punch 52 while the plate material P is supported by a die 54. The second step includes: a base part contact step in which the projection portion C and a base part R1 surrounding the projection portion C contact the punch 52; and a base part separation step in which the base part R1 is separated from the punch 52 by an elastic restoration force while the projection portion C is in contact with the punch 52.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a press working method and a press working facility. [Background technology]

[0002] Patent Document 1 discloses a press processing apparatus using a hole forming device that punches a plate material to form a hole. In this press processing apparatus, a pierced hole is formed in the plate material by punching a portion of the plate material to be punched with a punch. The punch is lowered toward the plate material, and the tip of the punch punches the portion to be punched in the thickness direction of the plate material. The punched portion of the plate material becomes a roughly flat scrap, which falls into the hole in the die into which the punch is inserted. After forming a pierced hole in the plate material, the punch rises and leaves the hole in the die. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5477947 Summary of the Invention [Problem to be solved by the invention]

[0004] In the press processing device of Patent Document 1, when the punch is raised after punching out a plate material with the punch, the punched swarf may not fall but may rise with the punch while adhering to the tip of the punch. If the punched swarf rises with the punch, there is a problem in that the approximately flat plate-shaped punched swarf falls from the punch above the plate material and adheres to it. Furthermore, even if the punched swarf falls instead of rising with the punch, there is a concern that the approximately flat plate-shaped punched swarf may adhere to various locations during the punched swarf processing process.

[0005] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] A first aspect of the present invention is a press processing method for forming a pierce hole in a metal plate, the press processing method comprising: a first step of forming a convex portion that bulges in a thickness direction of the plate in a hole processing region of the plate; and a second step of placing the plate on a die of the hole forming device so that the convex portion faces a punch of the hole forming device and protrudes toward the punch, supporting a portion of the plate that surrounds the hole processing region with the die, and punching the hole processing region including the convex portion with the plate supported on the die, thereby forming the pierce hole in the plate. The second step comprises a base portion contacting step in which the convex portion and a base portion of the hole processing region that surrounds the convex portion come into contact with the punch; and a base portion separating step in which, with the convex portion in contact with the punch, the base portion separates from the punch by elastic restoring force.

[0007] According to this processing method, when a hole processing area in a plate material is punched with a punch, the base portion surrounding the convex portion moves away from the punch due to elastic restoring force, forming a space between the base portion and the punch. This effectively prevents the punched blank from sticking to the tip of the punch. Because the blank material has a convex portion, sticking of the blank material to various locations is prevented.

[0008] A second aspect of the present invention is a press working facility including a press forming device having a die including a first die and a second die, the first die and the second die moving relative to each other to form a convex portion in a plate material, and a hole forming device that processes a piercing hole in a hole processing area of ​​the plate material, wherein the die of the press forming device has a convex portion forming portion for forming the convex portion that bulges in the thickness direction of the plate material relative to the hole processing area of ​​the plate material, and the convex portion forming portion forms the convex portion that is smaller than the hole processing area when viewed from the direction of relative movement of the first die and the second die, and the hole forming device forms a piercing hole in a hole processing area of ​​the plate material. The hole forming device is a press processing facility that has a punch that punches out the hole processing area including the convex portion, and a die that supports a portion of the plate material that surrounds the hole processing area, and when forming a piercing hole in the plate material by punching out the hole processing area including the convex portion with the punch while the plate material is supported by the die, the hole forming device performs the following steps: bringing the convex portion and a base portion of the hole processing area that surrounds the convex portion into contact with the punch; and, while the convex portion is in contact with the punch, moving the base portion away from the punch by elastic restoring force.

[0009] According to this configuration, the press forming device of the press working facility can form the protrusion in the hole processing region together with the product shape portion of the plate material. [Effects of the Invention]

[0010] According to the present invention, there is a second step of forming a pierced hole in the plate material by punching a hole processing region of the plate material including the convex portion with a punch, and the second step includes a base portion contacting step in which the base portion surrounding the convex portion in the hole processing region and the convex portion contact the punch, and a base portion separating step in which the base portion separates from the punch by its elastic restoring force while the convex portion is in contact with the punch. As a result, when the hole processing region is punched with the punch, the base portion surrounding the convex portion separates from the punch by its elastic restoring force, forming a space between the base portion and the punch. Therefore, the space between the base portion and the punch effectively prevents the punched blank from sticking to the tip of the punch. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a configuration diagram of a press working facility according to an embodiment of the present invention. [Figure 2] FIG. 2 is an explanatory plan view showing the press-molding apparatus and the molded product shown in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is an explanatory view showing the vicinity of the convex portion forming portion of the press forming apparatus of FIG. [Figure 5] FIG. 5 is a diagram showing the overall configuration of the press-forming device during forming. [Figure 6] FIG. 6 is an explanatory view showing the vicinity of the convex portion forming portion in the press forming apparatus of FIG. [Figure 7] FIG. 7 is a plan view showing the vicinity of a convex portion of a plate material formed by a press forming device. [Figure 8] FIG. 8 is a diagram showing the overall configuration of the hole forming device of the press working facility shown in FIG. [Figure 9] FIG. 9 is a first explanatory diagram relating to the method of forming a piercing hole. [Figure 10] FIG. 10 is a second explanatory diagram regarding the method of forming a piercing hole. [Figure 11] FIG. 11 is a third explanatory view of the method for forming a piercing hole. DETAILED DESCRIPTION OF THE INVENTION

[0012] A preferred embodiment of the press working method and press working equipment 10 according to the present embodiment will be described in detail below with reference to the accompanying drawings.

[0013] As shown in Figure 1, the press processing equipment 10 includes a press forming device 121 that forms a metal plate material P (see Figure 3), and a hole forming device 122 that processes a pierce hole H (see Figure 7) in a hole processing area R (see Figure 4) of the plate material P.

[0014] As shown in Fig. 2, the press-forming device 121 forms a formed product (intermediate formed product M, see Fig. 5) by press-forming a plate material P. The formed product is, for example, a body panel or a door panel of a vehicle. However, the formed product is not limited to a body panel or a door panel of a vehicle.

[0015] As shown in FIG. 3, the press forming device 121 includes a die 14 having a first die 141 and a second die 142, and a blank holder 16 that holds a sheet material P between the die 141 and the first die 141. The first die 141 and the second die 142 are provided so as to be movable relative to each other. The first die 141 is a movable die. The second die 142 is a fixed die that is disposed opposite the first die 141. The first die 141 is disposed above the second die 142. The first and second dies 141 and 142 include a product forming section 17 that forms a product shape section Ps (see FIG. 2) in a product forming region of the sheet material P, and a convex portion forming section 18 that forms a convex portion C (see FIG. 5) in a hole processing region R of the sheet material P. The hole processing region R of the sheet material P is the portion where a pierced hole H (see FIG. 11) is formed by the hole forming device 122.

[0016] The product molding section 17 includes a first product molding section 171 provided in the first mold 141 and a second product molding section 172 provided in the second mold 142. In the mold opening direction of the first mold 141 and the second mold 142, the first product molding section 171 and the second product molding section 172 face each other.

[0017] As shown in FIG. 4, the convex portion molding portion 18 includes a first molding portion 181 provided in the first mold 141 and a second molding portion 182 provided in the second mold 142. The first molding portion 181 and the second molding portion 182 face each other in the mold opening direction of the first mold 141 and the second mold 142. The first molding portion 181 is a recess formed by recessing upward from the mold surface 141a of the first mold 141. The first molding portion 181 includes a first molding surface 201 and a first inclined surface 221 extending radially outward from the first molding surface 201. The first molding surface 201 intersects with the mold opening direction of the first mold 141 and the second mold 142. The first molding surface 201 is spaced upward from the mold surface 141a. The first inclined surface 221 is formed in an annular shape and inclined from the first molding surface 201 toward the mold surface 141a.

[0018] The second molding portion 182 is columnar and protrudes upward from the fixed portion 142a of the second mold 142 (see FIG. 3). When viewed from the mold opening direction of the first mold 141 and the second mold 142, the first and second molding portions 181 and 182 are circular. Note that the first and second molding portions 181 and 182 are not limited to being circular. The shapes of the first and second molding portions 181 and 182 may be any shape that corresponds to the shape of the protrusion C. When viewed from the mold opening direction of the first mold 141 and the second mold 142, the cross-sectional area of ​​the protrusion molding portion 18 is smaller than the area of ​​the hole machining region R of the plate material P. The second molding portion 182 includes a second molding surface 202 and a second inclined surface 222 extending radially outward from the second molding surface 202. The second molding surface 202 is perpendicular to the mold opening direction of the first mold 141 and the second mold 142. The second molding surface 202 faces the first molding surface 201 of the first mold 141. The second inclined surface 222 is formed in an annular shape and is inclined so as to extend from the second molding surface 202 toward the fixing portion 142a. The second inclined surface 222 faces the first inclined surface 221 of the first mold 141.

[0019] As shown in FIG. 2, the blank holder 16 is provided so as to surround the product forming section 17. As shown in FIG. 3, the blank holder 16 is disposed below the first die 141. The blank holder 16 faces a die surface 141a of the first die 141. The blank holder 16 is movable relative to the second die 142. The blank holder 16 is supported by a plurality of rods 26 and is urged toward the first die 141 by the rods 26. When the first die 141 and the second die 142 are opened, a sheet material P is placed on the holding surface 161 of the blank holder 16. As shown in FIG. 5, when the first die 141 and the second die 142 are closed, the sheet material P is sandwiched between the die surface 141a of the first die 141 and the holding surface 161 of the blank holder 16.

[0020] From the mold open state of the first mold 141 and the second mold 142 shown in FIG. 3, the first mold 141 moves relatively toward the second mold 142, thereby bringing the first mold 141 and the second mold 142 into a mold closed state (see FIG. 5). When the mold 14 is closed as shown in FIG. 6, the tip of the second molding part 182 is inserted into the first molding part 181. The first molding part 181 and the second molding part 182 form a convex part C in the hole machining region R of the plate material P. The convex part C bulges in the thickness direction of the plate material P toward the first mold 141. As shown in FIG. 7, the convex part C has a circular shape when viewed from the thickness direction of the plate material P. Note that the shape of the convex part C is not limited to a circular shape. For example, the shape of the convex part C may be an oval or a triangle.

[0021] As shown in Fig. 8, the hole forming device 122 processes pierce holes H (see Fig. 11) in the hole processing region R of the plate material P (intermediate molded product M) formed by the press forming device 121. As shown in Fig. 7, the pierce holes H are used as fastening holes into which fastening members (not shown) are inserted when fastening, for example, a vehicle body panel or door panel, which is a molded product, to another member.

[0022] As shown in Fig. 8, the hole forming device 122 includes a punch 52, a die 54, and a holder 56. The punch 52 is movable and punches out a hole processing region R including a protrusion C of a plate material P. The punch 52 moves relatively toward or away from the die 54 in response to the operation of a displacement mechanism (e.g., a hydraulic cylinder, etc.) not shown. The punch 52 and the die 54 form a processing mold 50. The workpiece in which a pierced hole H is formed by the hole forming device 122 is the plate material P.

[0023] The punch 52 has a punch portion 521 at its tip. The punch portion 521 punches out the plate material P in the thickness direction. The punch portion 521 has a cross-sectional shape corresponding to the shape of the pierced hole H. As shown in FIG. 7 , when viewed from the thickness direction of the plate material P, the shape of the pierced hole H is, for example, circular. The shape of the pierced hole H is not limited to a circular shape. For example, the shape of the pierced hole H may be oval, triangular, or rectangular. The tip surface of the punch portion 521 is a flat surface that intersects with the axial direction of the punch 52.

[0024] The die 54 is fixed and supports a surrounding portion Pr that surrounds the hole machining region R in the plate material P. The die 54 has a hole portion 541 and a first support surface 542 that surrounds the hole portion 541. The first support surface 542 is formed so as to be able to support the plate material P. The hole portion 541 faces the punch portion 521 of the punch 52. The hole portion 541 extends downward from the first support surface 542 of the die 54. The punch portion 521 of the punch 52 can be inserted into the hole portion 541 (see FIG. 11). The diameter of the hole portion 541 and the diameter of the punch portion 521 are approximately the same. The diameter of the hole portion 541 is approximately the same as the diameter of the piercing hole H.

[0025] The holder 56 is provided above the die 54. The holder 56 is movable relative to the die 54 in a direction toward or away from the die 54. The holder 56 is provided to surround the punch 52. The holder 56 has a second support surface 561 that faces the first support surface 542 of the die 54. The holder 56 and the punch 52 are each provided so as to be able to move independently relative to each other in the axial direction. The tip of the punch portion 521 is able to protrude axially from the second support surface 561 of the holder 56.

[0026] When the hole forming device 122 processes the pierced hole H, the holder 56 and the die 54 move relative to each other, so that the plate material P can be clamped between the second support surface 561 of the holder 56 and the first support surface 542 of the die 54 (see FIG. 9).

[0027] As shown in Fig. 8, in the initial position of hole forming device 122 before piercing hole H is formed, punch 52 is spaced upward from first support surface 542 of die 54 and is positioned inside holder 56, in an open die state. As shown in Fig. 10, when piercing hole H is formed, punch 52 is lowered toward die 54 by a displacement mechanism (not shown), and the tip of punch portion 521 protrudes downward from first support surface 542 of die 54 and is inserted into hole portion 541 of die 54.

[0028] Next, a processing method for forming an intermediate product M from a plate material P and forming a pierced hole H using the press processing equipment 10 will be described.

[0029] First, a first step is performed by using the press forming device 121 shown in Fig. 3 to form a protrusion C that bulges in the thickness direction of the plate material P in a hole machining region R (see Fig. 7) of the plate material P. As shown in Fig. 5, the protrusion C is formed in a part of the hole machining region R. The protrusion C is formed in the center of the hole machining region R.

[0030] As shown in FIG. 3, in the first step, the press forming apparatus 121 is in an initial state in which the blank holder 16 is raised and the holding surface 161 of the blank holder 16 and the second forming surface 202 of the second forming section 182 are flush with each other. In the initial state of the press forming apparatus 121, the sheet material P is placed so that its front surface (hereinafter referred to as the first surface S1) faces the first die 141 and its back surface (hereinafter referred to as the second surface S2), which is the surface opposite to the first surface S1, abuts against the holding surface 161 and the second forming surface 202 of the blank holder 16. In the press forming apparatus 121, the sheet material P is held in a direction intersecting the die opening direction between the first die 141 and the second die 142. The sheet material P has a hole processing region R in which a pierced hole H (see FIG. 7) is formed, and the hole processing region R is disposed so as to face the convex portion forming section 18. The plate material P may have one or more hole machining regions R. For example, when one plate material P has multiple hole machining regions R, the plate material P has multiple protrusion forming portions 18 corresponding to the hole machining regions R, respectively.

[0031] As the first die 141 is moved relative to the second die 142, as shown in FIG. 5, the die surface 141a of the first die 141 comes into contact with the holding portion Pa of the sheet material P held by the holding surface 161 of the blank holder 16. The sheet material P is held by the die surface 141a of the first die 141 and the holding surface 161 of the blank holder 16. As the first die 141 further descends, the blank holder 16 is pressed down via the rod 26 while holding the holding portion Pa of the sheet material P by the first die 141. As shown in FIG. 6, the first forming section 181 presses down a part of the hole machining region R of the sheet material P toward the second forming section 182. The sheet material P is plastically deformed between the first forming section 181 and the second forming section 182, and the sheet material P bulges upward (in the thickness direction). A convex portion C is formed in the hole machining region R of the sheet material P.

[0032] The convex portion C has a flat portion B1 and an annular inclined portion B2. The flat portion B1 is perpendicular to the protruding direction of the convex portion C. The flat portion B1 is formed by the first forming surface 201 and the second forming surface 202. The inclined portion B2 is inclined from the outer edge of the flat portion B1 toward the first surface S1 of the plate material P. The inclined portion B2 is formed by the first inclined surface 221 and the second inclined surface 222. The hole machining region R has the convex portion C and a base portion R1 surrounding the convex portion C.

[0033] 7, the protrusion C is formed smaller than the hole processing region R. When viewed in the thickness direction of the plate material P, the area of ​​the protrusion C is, for example, 20% to 70% of the area of ​​the preset pierced hole H. It is preferable that the area of ​​the protrusion C is 35% to 60% of the area of ​​the pierced hole H.

[0034] As shown in Fig. 6, the height L of the protrusions C relative to the surface of the base portion R1 is greater than the thickness Pt of the plate material P. The height L of the protrusions C is the distance in the thickness direction of the plate material P from the surface of the base portion R1 to the surface of the flat portion B1 on the first surface S1 of the plate material P. The height L of the protrusions C is preferably at least twice the thickness Pt of the plate material P. It is more preferable that the height L of the protrusions C be within a range of 3 to 6 times the thickness Pt of the plate material P.

[0035] In the first step of the press molding device 121, the product shape portion Ps (see FIG. 2) is molded by the product molding section 17 to form an intermediate molded product M, and at the same time, the convex portion molding section 18 forms a convex portion C. After the first mold 141 and the second mold 142 are opened, the intermediate molded product M having the convex portion C is removed from the mold 14.

[0036] Next, a piercing hole processing step (second step) is performed in which a piercing hole H is formed in the plate material P (intermediate molded product M) by the hole forming device 122. The piercing hole processing step includes a supporting step in which the plate material P is supported by the die 54 so that the convex portion C of the plate material P faces the punch 52, and a punching step in which the hole processing region R of the plate material P is punched out with the punch 52 to form the piercing hole H. The second step is made up of the supporting step and the punching step.

[0037] 8 shows the initial position (mold open state) of the hole forming device 122 in which the punch 52 and holder 56 are spaced upward from the surface of the die 54, and the punch 52 is disposed inside the holder 56. The plate material P (intermediate formed product M) is placed in the die 54 so that the hole machining region R including the convex portion C faces the punch 52 and so that the convex portion C protrudes toward the punch 52. The second surface S2 of the plate material P is supported by abutting against the surface of the die 54. In the hole forming device 122, the plate material P is held approximately horizontally.

[0038] In the second supporting step, after the plate material P is placed on the surface of the die 54, the holder 56 is lowered toward the die 54 by a displacement mechanism (not shown). The plate material P is sandwiched between the surface of the die 54 and the holder 56 (see FIG. 9).

[0039] Next, in the second punching step, a pierce hole H is formed in the intermediate molded product M supported by the die 54 and the holder 56. A displacement mechanism (not shown) lowers the punch 52 toward the hole processing region R of the plate material P. In the second step, the first surface S1 of the plate material P faces the punch 52 and the holder 56. The second surface S2 of the plate material P faces the die 54.

[0040] The second punching step includes a protrusion contact step, a base contact step, and a base separation step. As shown in Fig. 9, in the protrusion contact step, punch 52 is lowered so that the tip surface of punch portion 521 contacts flat portion B1 of protrusion C. The tip surface of punch portion 521 and flat portion B1 come into surface contact.

[0041] As the punch 52 further descends, the protrusion C in the hole machining region R is pressed down by the punch portion 521, causing the hole machining region R, including the protrusion C, to elastically deform downward. As a result, as shown in FIG. 10 , in the base portion contact step, the tip surface of the punch portion 521 contacts the protrusion C and the outer periphery of the base portion R1 in the hole machining region R. Specifically, the tip surface of the punch portion 521 abuts against the periphery of the outer edge of the hole machining region R, which is inside the surrounding portion Pr of the sheet material P supported by the holder 56 and the die 54. As a result, the connecting portion R2 connecting the protrusion C and the base portion R1 in the hole machining region R of the sheet material P becomes convex in a direction away from the punch 52. The connecting portion R2 is annular. As a result, the protrusion C is recessed relative to the connecting portion R2 on the second surface S2. At this time, a first space 58a is formed that is surrounded by the protrusion C, the base portion R1, the connecting portion R2, and the tip surface of the punch portion 521. That is, the first space 58a is formed between the tip surface of the punch 52 and the first surface S1 of the sheet material P. The first space 58a is annular with the axis of the punch 52 as its center.

[0042] When the punch 52 is further lowered from a state in which the tip surface of the punch portion 521 is in contact with the protrusion C and the base portion R1, the tip surface of the punch portion 521 protrudes downward from the second support surface 561 of the holder 56, and the punch portion 521 is inserted into the hole portion 541 of the die 54 together with the sheet material P. The tip surface of the punch portion 521 moves downward from the first support surface 542 of the die 54. As a result, as shown in FIG. 11 , the tip surface of the punch portion 521 shears the outer edge of the hole machining region R of the sheet material P. The punch portion 521 punches out the hole machining region R downward and separates it from the surrounding portion Pr of the sheet material P. Hereinafter, the portion of the sheet material P that has been punched out in the hole machining region R will be referred to as a blank material B. A pierced hole H is formed in the hole machining region R by punching out the sheet material P. The pierced hole H has, for example, a circular shape corresponding to the cross-sectional shape of the punch 52.

[0043] After the hole machining area R of the plate material P is punched out by the punch 52, with the protrusion C in contact with the tip surface of the punch 52, the base portion R1 separates from the punch 52 due to the elastic restoring force that causes the elastically deformed plate material P to return to its original shape (base portion separation process).

[0044] Due to the elastic restoring force of the blank B, the base portion R1, which is the outer edge of the blank B, is displaced in a direction away from the punch 52, and the base portion R1 and the punch portion 521 are no longer in contact with each other. As a result, a second space 58b between the tip surface of the punch 52 and the first surface S1 of the blank B is larger than the first space 58a in the base portion contact step shown in FIG. 10. In one embodiment illustrated in FIG. 11, the base portion R1 assumes a shape (post-elastic deformation shape) that is inclined radially outward and upward relative to a state in which it is parallel to the flat portion B1 of the convex portion C. Note that the base portion R1 and the flat portion B1 may be parallel when the second space 58b is formed.

[0045] Completion of the base portion separation step completes the second step of forming a pierced hole H in the hole processing region R. After completion of the second step, the punch 52 is raised by a displacement mechanism (not shown), and the punch portion 521 is released upward from the hole 541 of the die 54 (see the two-dot chain line in FIG. 11). The blank B has a shape with a protrusion C. At this time, the blank B falls downward within the hole 541 of the die 54 while separated from the punch 52. Alternatively, the blank B may be held in a state where it is caught within the hole 541. In this case, when the next blank B punched in the next press processing step falls into the hole 541, the weight of the next blank B is applied to the previous blank B, causing the previous blank B to fall downward.

[0046] This embodiment has the following advantages.

[0047] The press processing method for piercing holes H includes a first step of forming a protrusion C that bulges in the thickness direction of the plate material P in a hole processing region R of the plate material P, as shown in Fig. 3, and a second step of punching out the hole processing region R including the protrusion C with a punch 52, as shown in Fig. 11, while the plate material P is supported by a die 54, as shown in Fig. 9. The second step includes a base portion contact step in which the protrusion C and a base portion R1 of the hole processing region R come into contact with the punch 52, and a base portion separation step in which, with the protrusion C in contact with the punch 52, the base portion R1 separates from the punch 52 due to its elastic restoring force.

[0048] In this press working method, when the hole processing region R of the plate material P is punched with the punch 52, the base portion R1 surrounding the protrusion C moves away from the punch 52 due to its elastic restoring force, and a second space 58b is formed between the base portion R1 and the punch 52. As a result, the second space 58b between the base portion R1 and the punch 52 effectively prevents the punched blank material B from sticking to the tip of the punch 52. Furthermore, because the blank material B has the protrusion C, the protrusion C prevents the blank material B from sticking to various locations compared to a substantially flat blank material.

[0049] 10, in the base portion contacting step, the connecting portion R2 that connects the convex portion C and the base portion R1 in the hole machining region R becomes convex in the direction away from the punch 52. As a result, the connecting portion R2 in the hole machining region R becomes convex, and as a result, the base portion R1 is smoothly separated from the punch 52 in the base portion separating step, as shown in FIG. 11. Therefore, the second space 58b can be effectively formed between the base portion R1 and the punch 52.

[0050] As shown in Fig. 7, when viewed in the thickness direction of the sheet material P, the area of ​​the protrusion C is 20% to 70% of the area of ​​the pierced hole H, and therefore, as shown in Fig. 10, when the tip of the punch 52 comes into contact with the protrusion C, a sufficient first space 58a can be secured between the tip of the punch 52 and the sheet material P. This makes it possible to more effectively prevent the blank material B from sticking to the tip of the punch 52. Furthermore, when punching out the sheet material P with the punch 52, it is possible to achieve an appropriate balance between preventing the blank material B from sticking to the punch 52 and the formability of the protrusion C.

[0051] As shown in FIG. 6, the height L of the protrusions C relative to the surface (first surface S1) of the base portion R1 is greater than the thickness Pt of the sheet material P. Therefore, by making the height L of the protrusions C greater than the thickness Pt, as shown in FIG. 11, when punching the hole machining region R with the punch 52, it is possible to effectively form a first space 58a and a second space 58b between the base portion R1 and the punch 52. This makes it possible to more effectively prevent the blank material B from sticking to the tip of the punch 52. Furthermore, when punching the sheet material P with the punch 52, it is possible to achieve an appropriate balance between preventing the blank material B from sticking to the punch 52 and the formability of the protrusions C.

[0052] 6, the height L of the protrusion C relative to the surface of the base portion R1 is within a range of three to six times the thickness Pt of the plate material P. This makes it possible to more effectively ensure the first space 58a between the tip of the punch 52 and the plate material P.

[0053] As shown in FIG. 1 , press processing equipment 10 includes a press forming device 121 that forms a convex portion C in a plate material P, and a hole forming device 122 that drills a pierce hole H in a hole processing region R of the plate material P. A mold 14 of the press forming device 121 has a convex portion forming section 18 that forms the convex portion C in the hole processing region R of the plate material P. As shown in FIG. 8 , the hole forming device 122 has a punch 52 that punches out the hole processing region R including the convex portion C. When forming a pierce hole H in the plate material P by punching out the hole processing region R including the convex portion C with the punch 52, the hole forming device 122 performs the following steps: bringing the convex portion C and a base portion R1 surrounding the convex portion C in the hole processing region R into contact with the punch 52, as shown in FIG. 10 ; and, as shown in FIG. 11 , moving the base portion R1 away from the punch 52 by elastic restoring force while keeping the convex portion C in contact with the punch 52. As a result, the press forming device 121 can form the protrusions C in the hole processing regions R together with the product shape portions Ps of the plate material P.

[0054] In addition to the above disclosure, the following additional notes are disclosed.

[0055] (Appendix 1) The press processing method is a press processing method for forming a pierce hole (H) in a metal plate material (P), and the press processing method includes: a first step of forming a convex portion (C) that bulges in the thickness direction of the plate material in a hole processing region (R) of the plate material; and a second step of placing the plate material on a die (54) of a hole forming device (122) so that the convex portion faces a punch (52) of the hole forming device and protrudes toward the punch, supporting a portion of the plate material that surrounds the hole processing region with the die, and punching the hole processing region including the convex portion with the plate material supported on the die, thereby forming the pierce hole in the plate material.The second step includes a base portion contact step in which the convex portion and a base portion (R1) of the hole processing region that surrounds the convex portion come into contact with the punch; and a base portion separation step in which, with the convex portion C in contact with the punch, the base portion separates from the punch by elastic restoring force.

[0056] According to this processing method, when the hole processing area of ​​the plate material is punched with the punch, the base portion surrounding the protrusion moves away from the punch due to its elastic restoring force, thereby forming a space between the base portion and the punch, which effectively prevents the punched blank material from sticking to the tip of the punch.

[0057] (Appendix 2) In the stamping method described in Appendix 1, the hole machining region may have a first surface (S1) facing the punch in the second step and a second surface (S2) opposite the first surface, and in the base portion contact step, a connecting portion (R2) connecting the convex portion and the base portion in the hole machining region may be convex on the second surface in a direction away from the punch. With this configuration, the connecting portion on the second surface of the hole machining region is convex, so that the base portion is smoothly separated from the punch in the subsequent base portion separation step. This effectively forms a space between the base portion and the punch.

[0058] (Appendix 3) In the press working method described in Supplementary Note 1 or 2, the area of ​​the convex portion may be 20% to 70% of the area of ​​the pierced hole when viewed in the thickness direction of the plate material. With this configuration, when the tip of the punch and the convex portion come into contact with each other, a sufficient space can be secured between the tip of the punch and the plate material. Therefore, sticking of the blank to the tip of the punch can be more effectively suppressed. Furthermore, when punching out the plate material with the punch, it is possible to achieve an appropriate balance between preventing sticking of the blank to the punch and the formability of the convex portion.

[0059] (Appendix 4) In the press forming method described in Appendix 1, the base portion may have a surface facing the tip of the punch, and a height (L) of the convex portion relative to the surface of the base portion may be greater than a thickness (Pt) of the sheet material. According to this configuration, by making the height of the convex portion greater than the sheet thickness, a space can be effectively formed between the base portion and the punch when punching a hole processing region with the punch. This can more effectively prevent the blank from sticking to the tip of the punch. Furthermore, when punching the sheet material with the punch, it is possible to achieve an appropriate balance between preventing the blank from sticking to the punch and the formability of the convex portion.

[0060] (Appendix 5) In the stamping method described in Appendix 4, the height of the protrusion relative to the surface of the base may be within a range of 3 to 6 times the thickness of the plate material. With this configuration, it is possible to more effectively ensure a space between the tip of the punch and the plate material.

[0061] (Appendix 6) The press working facility (10) includes a die (14) having a first die (141) and a second die (142), a press forming device (121) that forms a convex portion (C) in a plate material (P) by moving the first die and the second die relative to each other, and a hole forming device (122) that forms a pierced hole (H) in a hole processing region (R) of the plate material, and the die of the press forming device has a convex portion forming portion (18) for forming the convex portion that bulges in the thickness direction of the plate material relative to the hole processing region of the plate material, and the convex portion forming portion is smaller than the hole processing region when viewed from the direction of relative movement of the first die and the second die. The hole forming device forms the convex portion and has a punch (52) that punches out the hole processing area including the convex portion, and a die (54) that supports the portion of the plate surrounding the hole processing area, and when the hole forming device forms the piercing hole in the plate by punching out the hole processing area including the convex portion with the punch while the plate is supported by the die, it performs the following steps: bringing the convex portion and a base portion (R1) of the hole processing area that surrounds the convex portion into contact with the punch; and, while the convex portion is in contact with the punch, moving the base portion away from the punch by elastic restoring force.

[0062] According to this configuration, the press forming device can form the product shape portion of the plate material as well as the convex portion in the hole processing region.

[0063] The present invention is not limited to the above disclosure, and various configurations can be adopted without departing from the gist of the present invention. [Explanation of symbols]

[0064] 52...Punch 54...Die 122…hole forming device C...Convex part H...pierced ears P…Plate material R…Hole machining area R1: Base

Claims

1. A press processing method for forming a pierced hole in a metal plate material, comprising: The press working method includes a first step of forming a protrusion that protrudes in a thickness direction of the plate material in a hole working region of the plate material; a second step of placing the plate on a die of the hole forming device so that the convex portion faces a punch of the hole forming device and protrudes toward the punch, supporting a portion of the plate surrounding the hole processing area with the die, and punching out the hole processing area including the convex portion with the punch while the plate is supported on the die, thereby forming the pierce hole in the plate; and The second step comprises: a protrusion contacting step in which a tip surface of the punch and a flat portion of the protrusion are brought into surface contact with each other; a base portion contacting step in which the protrusion and a base portion surrounding the protrusion in the hole machining region come into contact with the punch; a base portion separating step in which the base portion is separated from the punch by an elastic restoring force while the protrusion is in contact with the punch, a press processing method in which, in the base portion contact process, the tip surface of the punch is in contact with the convex portion and the outer periphery of the base portion, and a space is formed between the convex portion and the base portion, the space being surrounded by the convex portion, the outer periphery of the base portion, and the punch.

2. The press working method according to claim 1, the hole machining area has a first surface facing the punch in the second step and a second surface opposite to the first surface, In the base portion contact process, a connecting portion in the hole processing area that connects the convex portion and the base portion is convex on the second surface in a direction away from the punch, in a press processing method.

3. The press working method according to claim 1 or 2, When viewed from the thickness direction of the plate material, the area of ​​the convex portion is 20% to 70% of the area of ​​the pierced hole.

4. The press working method according to claim 1, The base portion has a surface facing the tip of the punch, and the height of the convex portion relative to the surface of the base portion is greater than the thickness of the plate material.

5. The press working method according to claim 4, a height of the convex portion relative to the surface of the base portion within a range of 3 to 6 times the thickness of the plate material.

6. a press forming device having a mold including a first die and a second die, wherein the first die and the second die move relative to each other to form a convex portion on a plate material; a hole forming device that processes a pierce hole in a hole processing area of ​​the plate material; A press processing facility comprising: the die of the press forming apparatus has a convex portion forming portion for forming the convex portion that bulges in a thickness direction of the plate material with respect to the hole processing region of the plate material, the protrusion forming portion forms the protrusion smaller than the hole machining area when viewed from a relative movement direction of the first die and the second die, The hole forming device includes a punch that punches out the hole processing area including the protrusion; a die that supports a portion of the plate surrounding the hole machining area; and The hole forming device is press processing equipment that performs the following steps when, with the plate material supported on the die, the plate material is pierced through the hole processing region including the convex portion with the punch, thereby forming the pierce hole in the plate material: bringing the flat portion of the convex portion into surface contact with the tip surface of the punch; bringing the punch into contact with a base portion surrounding the convex portion in the hole processing region, and with the tip surface of the punch in contact with the convex portion and the outer periphery of the base portion, forming a space surrounded by the convex portion, the outer periphery of the base portion, and the punch; and moving the base portion away from the punch by elastic restoring force while the convex portion is in contact with the punch.

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