JP2006263768A - Apparatus and method for press working - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press working apparatus and a press working method by which a portion which is formed into a fracture-surface shape of a blanked surface along a blanking direction of the blanked part in a workpiece is reduced without increasing the number of processes and also the generation of burrs on the workpiece is suppressed in the case blanking is applied to the workpiece. <P>SOLUTION: A first working unit and a second working unit 14 are provided on the press working apparatus, a first stage for forming a half-blanked part 15 which is projected in the part to be blanked of a sheet W is performed in the first working unit. A second stage S2 where half-blanking work is performed from the direction opposite to the first half-blanking work to the half-blanked part 15 of the sheet W with a second punch 28 and a second die 25 in the second working unit 14. As a result, a part to be blanked is blanked from the sheet W. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a press working apparatus and a press working method for punching a workpiece having a relatively large thickness as a raw material such as an element of a continuously variable transmission belt or a press molded part of an automatic transmission.

  Conventionally, as this type of press working apparatus, for example, a press working apparatus described in Patent Document 1 has been proposed. The press working apparatus includes: a first working unit that forms an annular groove surrounding the punched portion at a portion of the workpiece punched by the press working device (hereinafter referred to as a “punched portion”); And a second machining unit for punching out the part from the inner part of the annular groove of the workpiece. The first processing unit is provided with a groove forming device having an acute-angled blade portion (for example, a punch having a blade portion on the contact surface side with the workpiece). In the first step by the first processing unit, the annular groove is cut and formed by a predetermined depth by the groove forming device.

The second machining unit is provided with a male and female punch and a die, and in the second step by the second machining unit, when the punched portion of the workpiece is disposed between the punch and the die, The punch approaches the die side and comes into contact with the punched portion of the workpiece. Then, when the punch pushes the punched portion of the workpiece to the die side, the punched portion is punched from the inner portion of the annular groove of the workpiece, and a through hole having a substantially circular cross section is formed in the workpiece. It has become. At this time, since the annular groove is formed in the work in the first process, when the caulking part is punched from the work by the punch and the die in the second process, the work has a “burr”. Does not occur.
Japanese Patent Laying-Open No. 2001-150052 (FIGS. 1 and 3)

  By the way, in the second step, the punched portion is removed from the workpiece by breaking the connecting portion between the workpiece and the punched portion by a pressing force when the punch pushes the punched portion of the workpiece to the die side. I was punching. Therefore, when the punched portion is punched from the workpiece with the press working apparatus described in Patent Document 1, most of the side wall surface of the through hole (the punching surface along the punching direction of the punched portion of the workpiece) is rough. As a result, the side wall surface was hardly formed with a rough surface. Further, most of the side wall surface of the punched portion also has a rough fracture surface. Therefore, it has been necessary to further polish the entire side wall surfaces so as to have a surface roughness equivalent to the sheared surface by using a separate apparatus such as a polishing apparatus. That is, there has been a problem that a polishing step by the polishing apparatus has to be added as a third step after the first step and the second step.

  The present invention has been made in view of such circumstances. The purpose is to reduce the portion of the punched surface along the punching direction of the punched portion of the workpiece formed in the shape of a fractured surface without increasing the number of steps when punching the workpiece. It is another object of the present invention to provide a press working apparatus and a press working method capable of suppressing the occurrence of “burr”.

  In order to achieve the above object, according to the first aspect of the present invention, the workpiece is punched into the workpiece by placing the workpiece between the punch and the die and moving the punch and the die relative to each other. A press working apparatus, comprising: a first working unit and a second working unit, wherein the first working unit comprises a first punch and a first die, wherein the first punch is The clearance with the first die is set to be a negative clearance, and the workpiece is installed so as to approach from the one surface side to the other surface side, and the second machining unit includes the second punch and the second die. The second punch is set so that a clearance with the second die becomes zero or a negative clearance, and approaches from the other surface side to the one surface side of the workpiece. And summarized in that the to be installed.

  According to a second aspect of the present invention, in the press working apparatus according to the first aspect, the first processing unit is punched in the workpiece by relatively moving the first punch and the first die in the vertical direction. The gist is to perform a half punching process on the part.

  According to a third aspect of the present invention, there is provided the press working apparatus according to the second aspect, wherein the first processing unit has a thickness of the workpiece when the first punch is relatively close to the first die. The gist is that the first punch is configured to approach a position separated from the first die by a distance dimension of 35.0% to 87.5% in dimension.

  According to a fourth aspect of the present invention, there is provided the press working apparatus according to the second aspect, wherein the first processing unit has a thickness of the workpiece when the first punch is relatively close to the first die. The gist is that the first punch is configured to approach a position spaced from the first die by a distance dimension of 10.0% to 90.0%.

  According to a fifth aspect of the present invention, in the press working apparatus according to any one of the second to fourth aspects, the second working unit moves the second punch and the second die relative to each other in the vertical direction. By moving, a part of the workpiece that has been half-punched by the first machining unit is subjected to half-punching from a direction opposite to half-punching in the first machining unit, and half-cut by the second machining unit. The gist is to punch a part of the workpiece that has been half-punched by the first machining unit by punching.

  According to a sixth aspect of the present invention, in the press working apparatus according to the fifth aspect, the second processing unit has a thickness of the workpiece when the second punch comes relatively close to the second die. The gist is that the second punch is configured to approach a position separated from the second die by a distance dimension of 25.0% or less of the dimension.

  According to a seventh aspect of the present invention, in the press working apparatus according to the fifth aspect, the second processing unit has a thickness of the workpiece when the second punch comes relatively close to the second die. The gist is that the second punch is configured to approach a position separated from the second die by a distance dimension of 10.0% or more in dimension.

  According to an eighth aspect of the present invention, in the press working apparatus according to any one of the first to seventh aspects, the first punch has a width dimension of clearance with the first die of the workpiece. The gist is that the width dimension is 2.5% to 7.5% in the thickness dimension.

  Invention of Claim 9 is the press work apparatus as described in any one of Claims 1-8, The edge part of the side facing the said workpiece | work in said 1st punch, and said 1st die | dye The gist of the invention is that chamfering is performed on the inner edge of the side facing the workpiece so as to have a curved surface.

  A tenth aspect of the present invention is the press working apparatus according to the ninth aspect, wherein the curved surface of the edge portion of the first punch facing the workpiece is obtained by cutting the first punch vertically. The gist is that chamfering is performed so as to form an arc shape having a radius of curvature of 12.5% or less in the thickness dimension of the workpiece.

  The invention according to claim 11 is the press working apparatus according to claim 10, wherein the curved surface of the edge portion of the first punch facing the workpiece is obtained by cutting the first punch vertically. The gist of the present invention is to form an arc having a radius of curvature of 2.5 to 12.5% in the thickness dimension of the workpiece.

  The invention according to claim 12 is the press working apparatus according to claim 9, wherein the curved surface of the edge portion of the first punch facing the workpiece is obtained by cutting the first punch vertically. The gist is that chamfering is performed so as to form an arc shape having a radius of curvature having a length dimension of 12.5% to 25.0% in the thickness dimension of the workpiece.

  The invention according to claim 13 is the press working apparatus according to any one of claims 9 to 12, wherein the curved surface of the inner edge of the first die facing the workpiece is the When the first die is cut in the vertical direction, the gist is that chamfering is performed so as to form an arc shape having a radius of curvature equal to or less than the length of 12.5% of the thickness of the workpiece.

  According to a fourteenth aspect of the present invention, in the press working apparatus according to the thirteenth aspect, the curved surface of the inner edge portion on the side facing the workpiece in the first die cuts the first die vertically. The gist is that chamfering is performed so as to form an arc shape having a curvature radius of 2.5% to 12.5% in the thickness dimension of the workpiece.

  According to a fifteenth aspect of the present invention, in the press working apparatus according to any one of the first to fourteenth aspects, the second punch has a width dimension of a clearance with the second die of the workpiece. The gist is that it is formed to have a width dimension of 5.0% or less in the thickness dimension.

  According to a sixteenth aspect of the present invention, in the press working apparatus according to any one of the first to fourteenth aspects, the second punch has a width dimension of a clearance with the second die of the workpiece. The gist is that the width dimension is 2.5% or less in the thickness dimension.

  The invention according to claim 17 is the press working apparatus according to any one of claims 1 to 16, wherein the second punch cuts the second punch in a direction perpendicular to the vertical direction. The gist of the present invention is that the cross-sectional shape in this case is a shape obtained by similarly expanding the cross-sectional shape when the first punch is cut in a direction perpendicular to the vertical direction.

  According to an eighteenth aspect of the present invention, in the press working apparatus according to the seventeenth aspect, the second punch has a cross-sectional shape when the second punch is cut in a direction perpendicular to the vertical direction, and the first punch. When the cross-sectional shape obtained by cutting in a direction perpendicular to the vertical direction is overlapped in the vertical direction, the distance between the outer peripheral parts having similar shapes is 5.0% of the thickness of the workpiece The gist is that the distance dimension is equal to or less than the dimension.

  According to a nineteenth aspect of the present invention, in the press working apparatus according to the eighteenth aspect, the second punch has a cross-sectional shape when the second punch is cut in a direction perpendicular to the vertical direction, and the first punch. When the cross-sectional shape obtained by cutting the substrate in the direction perpendicular to the vertical direction is overlapped in the vertical direction, the distance between the outer peripheral parts having similar shapes is 3.75% to 5% in the thickness of the workpiece The gist is that the distance dimension is 0.0%.

  The invention according to claim 20 is the press working apparatus according to any one of claims 1 to 16, wherein the second punch cuts the second punch in a direction perpendicular to the vertical direction. The gist of the present invention is that the cross-sectional shape in this case is configured to be similar to the cross-sectional shape when the first punch is cut in a direction perpendicular to the vertical direction.

  The invention according to claim 21 is the press working apparatus according to claim 20, wherein the second punch has a cross-sectional shape when the second punch is cut in a direction perpendicular to the vertical direction, and the first punch. When the cross-sectional shape obtained by cutting in a direction perpendicular to the vertical direction is overlapped in the vertical direction, the distance between the outer peripheral parts having similar shapes is 5.0% of the thickness of the workpiece The gist is that the distance dimension is equal to or less than the dimension.

  According to a twenty-second aspect of the present invention, in the press working apparatus according to any one of the first to twenty-first aspects, a curved surface is formed on an edge of the second punch that faces the workpiece. The gist is that chamfering is performed so as to have.

  The invention according to claim 23 is the press working apparatus according to claim 22, wherein the curved surface of the edge portion on the side facing the workpiece in the second punch cuts the second punch vertically. The gist is that chamfering is performed so as to form an arc shape having a radius of curvature of 12.5% or less in the thickness dimension of the workpiece.

  According to a twenty-fourth aspect of the present invention, in the press working apparatus according to the twenty-third aspect, the curved surface of the edge portion on the side facing the workpiece in the second punch is obtained by cutting the second punch in the vertical direction. The gist is that chamfering is performed so as to form an arc shape having a curvature radius of 2.5% to 12.5% in the thickness dimension of the workpiece.

  According to a twenty-fifth aspect of the present invention, in the press working apparatus according to any one of the first to twenty-fourth aspects, a chamfering process is performed on an inner edge of the second die facing the workpiece. The gist is that

  According to a twenty-sixth aspect of the present invention, in the press working apparatus according to the twenty-fifth aspect, the inner edge of the second die facing the workpiece is chamfered so as to form an oblique shape. The inner edge of the second die is chamfered from the inner edge to a length of 5.0% or less in the thickness of the workpiece.

  According to a twenty-seventh aspect of the present invention, in the press working apparatus according to the twenty-fifth aspect, the inner edge of the second die facing the workpiece is chamfered so as to have a curved surface. The curved surface of the inner edge portion of the second die has an arc shape having a radius of curvature equal to or less than a length dimension of 5.0% of the thickness dimension of the workpiece when the second die is cut vertically. The gist is that chamfering is applied.

  The invention according to claim 28 is the press working apparatus according to any one of claims 1 to 27, wherein the first die is formed with an insertion hole penetrating vertically. In the insertion hole, an abutting member having an abutting surface that abuts on a workpiece disposed in the first processing unit and an urging means for urging the corresponding member toward the workpiece are provided. This is the gist.

  The invention according to claim 29 is the press working apparatus according to any one of claims 1 to 28, wherein an insertion hole extending in the vertical direction is formed through the second punch, The second processing unit is provided with a movable member that is movable in the vertical direction in the insertion hole.

  The gist of the invention described in claim 30 is that the press working apparatus according to any one of claims 1 to 29 is used when manufacturing a backing plate for an automatic transmission.

  The invention as set forth in claim 31 is a pressing method for punching a workpiece by relatively moving the punch and the die, using the first punch and the first die having a male and female relationship, The clearance between one punch and the first die is set to a negative clearance, and the first punch is made to approach the first die from one surface side to the other surface side of the workpiece. The first step of half-punching the part to be punched in step 2 and the second punch and the second die having a sex relationship are used, and the clearance between the second punch and the second die is set to zero or negative clearance Then, the second punch is moved closer to the second die from the other surface side to the one surface side of the workpiece, thereby moving the second punch forward with respect to the portion that has been half-punched in the first step. The half die cutting the first step subjected to half die cutting from the opposite direction, and summarized in that and a second step of punching out a half die machined parts from said workpiece in said first step.

  The gist of a thirty-second aspect of the invention is that the press working method according to the thirty-first aspect is used when manufacturing a backing plate for an automatic transmission.

  According to the present invention, when punching a workpiece, it is possible to reduce a portion formed in a fractured surface shape among punched surfaces along the punching direction of a portion punched in the workpiece without increasing the number of steps. , It is possible to suppress the occurrence of “burr” in the workpiece.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is embodied in a press working apparatus and a press working method for punching a relatively thick plate material in order to process a backing plate which is a kind of press molded part of an automatic transmission. A form is demonstrated according to FIGS.

  As shown in FIG. 1, in the press working apparatus 11 of the present embodiment, a first working unit 13 and a second working unit 14 are arranged side by side on a base plate 12. The press working apparatus 11 is provided with a through-hole P (see FIG. 13) having a predetermined shape (in the present embodiment, a substantially circular cross section) in the plate material W made of a metal material (for example, iron) by the processing units 13 and 14. It comes to form. That is, in the first processing unit 13, as shown in FIG. 4, a part of the plate material (work) W where the through hole P is formed is subjected to half-punching, and a projecting shape is formed upward from the plate material W. A half punching portion 15 is formed. Further, in the second processing unit 14, as shown in FIG. 12, the half punched portion 15 is punched into a punched portion 15 </ b> A, and a through hole P is formed in the plate material W. At this time, the through-hole P is formed by punching so that most of the side wall surface (punching surface along the punching direction) Pa becomes a shear surface instead of a rough fracture surface. Then, a backing plate is formed by further processing the punched portion 15A. The “half punching process” is a process of stopping the punching halfway when trying to punch the punched part (the punched part 15A) from the workpiece (plate material W).

Next, the first processing unit 13 will be described below with reference to FIGS.
In the first processing unit 13, as shown in FIG. 1, a lower die 16 is disposed on the base plate 12, and a first punch 17 is attached and fixed on the lower die 16. Further, a plurality of (four) columnar columns 18 are erected on the base plate 12 so as to extend vertically through the four corners of the lower mold 16, and the lower mold 16 is vertically moved along each column 18. It comes to move. Although not shown, the first machining unit 13 includes a drive source (for example, a stroke source for moving the lower die 16 (and the first punch 17) between a bottom dead center position and a top dead center position (for example, , An actuator including a hydraulic cylinder (fluid pressure cylinder) or the like is provided.

  In the first processing unit 13, the upper die 19 is supported on the upper region of the lower die 16 through the columns 18, and the lower surface side of the upper die 19 has a male-female relationship. A first die 20 is attached and fixed. Further, when the plate material W is carried into the first processing unit 13 and subjected to press processing, the upper surface (other surface) Wa of the plate material W is the lower surface of the first die 20. A work presser (not shown) that pushes up the plate material W upward is provided so as to abut against 20a. The first punch 17 and the first die 20 are arranged with the plate material W sandwiched therebetween, and are relatively moved in the vertical direction.

  As shown in FIG. 2, the first die 20 has a first die hole (insertion hole) 21 having a substantially circular cross section corresponding to the cross sectional shape (hole shape) of the through hole P. The first die hole 21 is set such that its diameter dimension D1 is slightly smaller than the diameter dimension d1 of the through hole P. Further, the inner edge portion 20b on the lower surface 20a side (side facing the plate material W) of the first die 20 is chamfered so as to have a so-called curved surface 20c. In addition, the longitudinal cross-sectional shape of the inner edge portion 20b of the first die 20 in this embodiment is a circular shape having a diameter dimension of 8.0% (for example, 0.08 mm) in the thickness dimension d (for example, 1 mm) of the plate material W. Chamfering is applied to form a part. That is, the curved surface 20c of the inner edge portion 20b of the first die 20 has a curvature having a length dimension of 4.0% in the thickness dimension d (for example, 1 mm) of the plate material W when the first die 20 is cut in the vertical direction. It is formed so as to form an arc shape having a radius (for example, 0.04 mm). Here, the longitudinal sectional shape of the inner edge portion 20b indicates the sectional shape of the inner edge portion 20b of the first die 20 when the first die 20 is cut in the vertical direction.

  Further, in the first die hole 21, a contact plate (contact member) 22 having a contact surface 22a that contacts the upper surface Wa of the plate material W and a spring as a biasing means (only one is shown in FIG. 2). The upper end of the spring 23 is supported by the upper mold 19 and the lower end of the spring 23 is supported by the contact plate 22. As shown in FIG. 3, when the contact plate 22 is not biased by the spring 23, the contact surface 22a and the lower surface 20a of the first die 20 are located at the same position in the vertical direction. Yes. As shown in FIG. 4, when the half punching process using the first punch 17 and the first die 20 is started, the contact plate 22 is biased downward (plate W side) by the spring 23. The half punching portion 15 is biased downward.

  The first punch 17 is formed to have a substantially cylindrical shape corresponding to the cross-sectional shape (hole shape) of the through hole P. The first punch 17 is chamfered at the edge 17b on the upper surface 17a side (side facing the plate material W) so as to have a so-called curved surface 17c. Therefore, when the plate material W is subjected to half-punching processing by moving the first punch 17 upward, as shown in FIG. 4, a curved surface is formed on the lower surface (one surface) Wb side of the plate material W. Wc is formed. In addition, the longitudinal cross-sectional shape of the edge part 17b of the 1st punch 17 in this embodiment is a circular shape of the diameter dimension of 8.0% (for example, 0.08 mm) in the thickness dimension d (for example, 1 mm) of the board | plate material W. Chamfering is applied to form a part. That is, the curved surface 17c of the edge 17b of the first punch 17 has a curvature with a length dimension of 4.0% in the thickness dimension d (for example, 1 mm) of the plate material W when the first punch 17 is cut in the vertical direction. It is formed so as to form an arc shape having a radius (for example, 0.04 mm). Here, the longitudinal sectional shape of the edge portion 17b indicates the sectional shape of the edge portion 17b of the first punch 17 when the first punch 17 is cut in the vertical direction.

  Further, as can be understood from FIG. 2, the first punch 17 is set so that its diameter dimension D2 is larger than the diameter dimension D1 of the first die hole 21 in the first die 20. That is, the clearance (clearance width dimension) C1 formed between the first punch 17 and the first die 20 (first die hole 21) having a sex relationship is a negative clearance (C1 = (D1-D2) / 2 <0). In the present embodiment, the first punch 17 is formed so that the clearance C1 has a width dimension (eg, 0.0375 mm) of 3.75% in the thickness dimension d (eg, 1 mm) of the plate material W. Accordingly, in the first punch 17 of the present embodiment, the difference between the diameter dimension D2 and the diameter dimension D1 of the first die hole 21 is twice the clearance C1 (that is, D1−D2 = 2 × C1). Is set to

  The “clearance” means a gap between the punch (first punch 17) and the die hole (first die hole 21), and when the clearance (clearance C1) is “negative clearance”. The diameter (diameter dimension D2) of the punch (first punch 17) is larger than the diameter (diameter dimension D1) of the die hole (first die hole 21). On the other hand, when the clearance is “positive clearance”, the diameter of the punch is smaller than the diameter of the die hole.

Next, the first step S1 executed by the first processing unit 13 will be described below.
When the portion to be punched in the plate material W (the portion in which the through hole P is formed) is arranged in the upper region of the first punch 17, the work pressing portion moves the plate material W upward (to the first die 20 side). The upper surface Wa of the plate material W is brought into contact with the lower surface 20 a of the first die 20 and the contact surface 22 a of the contact plate 22. Next, the first punch 17 moves upward from the bottom dead center position based on the drive of the hydraulic cylinder. Then, as shown in FIG. 3, the upper surface 17a of the first punch 17 (the surface facing the plate material W) abuts against the lower surface Wb of the plate material W, and the first punch 17 faces upward with the contacted portion. Press. As a result, as shown in FIG. 4, the plate material W is formed with a half-cut portion 15 that protrudes toward the first die 20 (upward), and a droop Wc on the lower surface Wb side of the plate material W. It is formed. Thus, in the first processing unit 13, the first punch 17 and the first die 20 are relatively moved in the vertical direction, so that the part to be punched in the plate material W is subjected to half punching.

  Further, when the plate material W is half-punched by the first punch 17 and the first die 20, the plate material W includes an end edge portion 17 b of the first punch 17 and an inner edge portion 20 b of the first die 20. The compressive stress works in the vertical direction. At this time, since the clearance C1 is set to be a negative clearance, the portion sandwiched between the end edge portion 17b and the inner edge portion 20b is gradually processed and hardened by compressive stress. Sheared. Further, a larger pressing force is applied to the end edge portion 17b of the first punch 17 and the inner edge portion 20b of the first die 20 than when the clearance C1 is set to a positive clearance. However, in the present embodiment, the end edge portion 17b of the first punch 17 and the inner edge portion 20b of the first die 20 are each chamfered in a so-called round shape, and thus chamfered. The lifetimes of the first punch 17 and the first die 20 are longer than in the case where there is not.

  Further, the contact plate 22 moves upward in a state in which the contact surface 22a and the upper surface Wa of the plate material W (half punched portion 15) are in contact with each other, based on the upward press against the plate material W by the first punch 17. To do. Then, the abutting plate 22 urges the half punched portion 15 downward based on the urging force of the spring 23. Therefore, a buckling phenomenon does not occur in the half punched portion 15 in the thickness direction (vertical direction) of the plate material W. That is, “wrinkles” do not occur in the half punched portion 15.

  When the first punch 17 moves to the top dead center position, the first punch 17 stops moving upward. At this time, the upper surface 17a of the first punch 17 approaches the position separated from the lower surface 20a of the first die 20 by a distance dimension d2 of 80% of the thickness dimension d of the plate material W. Then, the first punch 17 moves to the bottom dead center position (see FIG. 2) and stops moving. That is, the first step S1 in the first processing unit 13 is completed. Thereafter, the pushing up of the plate material W by the work pressing portion is stopped, and the plate material W is separated from the first die 20. Then, the plate material W is sequentially fed from the first processing unit 13 to the second processing unit 14.

Next, the second processing unit 14 will be described with reference to FIGS. 1 and 5 to 13.
As shown in FIG. 1, in the second processing unit 14, a lower die 24 is disposed on the base plate 12, and a second die 25 is attached and fixed on the lower die 24. As shown in FIG. 5, the second die 25 is formed with a second die hole 26 having a substantially circular cross section corresponding to the cross sectional shape (hole shape) of the through hole P. The die hole 26 is set such that its diameter dimension D4 is slightly smaller than the diameter dimension d1 of the through hole P. Further, columnar columns 18 are erected at the four corners on the lower die 24, and the upper die 27 is supported through the columns 18 so as to be vertically movable in the upper region of the lower die 24. Although not shown, the second machining unit 14 includes a drive source (for example, a stroke source for moving the upper die 27 (and the second punch 28) between a top dead center position and a bottom dead center position (for example, , An actuator composed of a hydraulic cylinder (fluid pressure cylinder) or the like is provided in the same manner as in the case of the first processing unit 13.

  A second punch 28 having a male and female relationship with the second die 25 is fixedly attached to the lower surface side of the upper die 27. That is, in the press working apparatus 11 of the present embodiment, since the first punch 17 is attached and fixed to the lower die 16 in the first working unit 13, the second punch 28 is attached to the upper die 27 in the second working unit 14. It is attached and fixed to. The second punch 28 and the second die 25 are arranged with the plate material W sandwiched therebetween, and are relatively moved in the vertical direction. The second punch 28 is formed to have a substantially cylindrical shape corresponding to the cross-sectional shape (hole shape) of the through hole P. Further, the second punch 28 has a diameter dimension D3 that is 8.0% of a width dimension (for example, 0.08 mm) of the thickness dimension d (for example, 1 mm) in the plate material W, compared to the diameter dimension D2 of the first punch 17. It is set to be large.

  That is, the second punch 28 has a similar cross-sectional shape when the second punch 28 is cut in a direction perpendicular to the vertical direction, and a cross-sectional shape when the first punch 17 is cut in a direction perpendicular to the vertical direction. It is comprised so that the shape expanded to (2) may be made. In addition, when the cross-sectional shape when the second punch 28 is cut in the direction perpendicular to the vertical direction and the cross-sectional shape when the first punch 17 is cut in the direction perpendicular to the vertical direction are overlapped in the vertical direction The distance dimension between the outer peripheral parts having similar shapes is 4.0% (for example, 0.04 mm) in the thickness dimension d (for example, 1 mm) of the plate material W.

  A chamfering process is performed on an end edge portion 28b on the lower surface 28a side (side facing the plate material W) of the second punch 28 so as to have a so-called curved surface 28c. Therefore, when the plate material W is punched by moving the second punch 28 downward, as shown in FIG. 13, a curved weave Wd is formed on the upper surface Wa side of the plate material W. The In addition, the longitudinal cross-sectional shape of the edge part 28b of the 2nd punch 28 in this embodiment is a circular shape used as the diameter dimension (for example, 0.08 mm) of 8.0% in the thickness dimension d (for example, 1 mm) of the board | plate material W. FIG. Chamfering is applied to form a part. That is, the curved surface 28c of the edge portion 28b of the second punch 28 has a curvature with a length dimension of 4.0% in the thickness dimension d (for example, 1 mm) of the plate material W when the second punch 28 is cut in the vertical direction. It is formed so as to form an arc shape having a radius (for example, 0.04 mm).

  Further, an insertion hole 29 extending in the vertical direction is formed through the second punch 28 at a substantially central portion thereof, and a payout pin (movable member) 30 is disposed in the insertion hole 29. The payout pin 30 is slidable in the vertical direction in the insertion hole 29 of the second punch 28 by a drive source (not shown) (for example, a hydraulic cylinder). Further, the payout pin 30 follows the second punch 28 and moves in a downward stroke until the pressing of the plate material W (half-punched portion 15) by the second punch 28 is completed. That is, when the pay pin 30 follows the second punch 28 and moves in a stroke toward the bottom dead center position, the lower surface 30a of the pay pin 30 is positioned in the vertical direction with the lower surface 28a of the second punch 28. It comes to correspond.

  Further, as can be understood from FIG. 5, the diameter dimension D3 of the second punch 28 is larger than the diameter dimension D4 of the second die hole 26 in the second die 25 and the diameter dimension of the through hole P. It is set to have substantially the same dimensions as d1. That is, the clearance (clearance width dimension) C2 formed between the second punch 28 and the second die 25 having a sex relationship is a negative clearance (C2 = (D4-D3) / 2 <0). Is set to In the present embodiment, the second die 25 is formed so that the clearance C2 has a width dimension (for example, 0.025 mm) of 2.5% in the thickness dimension d (for example, 1 mm) of the plate material W. In addition, chamfering is performed on the inner edge 25b of the second die 25 on the upper surface 25a side (side facing the plate material W) so as to have a so-called rounded curved surface 25c. In addition, the longitudinal cross-sectional shape of the inner edge 25b of the second die 25 in the present embodiment is a circular shape having a diameter dimension of 8.0% (for example, 0.08 mm) in the thickness dimension d (for example, 1 mm) of the plate material W. Chamfering is applied to form a part. That is, the curved surface 25c of the inner edge 25b of the second die 25 has a curvature having a length dimension of 4.0% in the thickness dimension d (for example, 1 mm) of the plate material W when the second die 25 is cut in the vertical direction. It is formed so as to form an arc shape having a radius (for example, 0.04 mm).

Next, the second step S2 executed by the second processing unit 14 will be described below.
The plate material W on which the half punched portion 15 is formed in the first processing unit 13 is conveyed into the second processing unit 14, and the half punched portion 15 is disposed below the second punch 28 (see FIG. 5). At this time, the lower surface 30a of the pay pin 30 and the lower surface 28a of the second punch 28 are at the same position in the vertical direction. Then, when the second step S2 is started, as shown in FIG. 6, the second punch 28 and the payout pin 30 are moved downward toward the plate material W (half punched portion 15), and the half of the plate material W is moved. The extraction part 15 is pushed downward. Then, as shown in FIG. 7, it will be in the state by which a part of joining site | part of the said half punching part 15 and the board | plate material W was cut | disconnected. That is, in the second step S2, the second punch 28 is moved toward the second die 25, so that the second punch 28 reverses the half-punched portion 15 of the plate material W to the half-punching process of the first step S1. It will be pressed from the direction.

  Then, as shown in FIG. 8, the second punch 28 pushes the half punched portion 15 further downward and starts shearing the plate material W. That is, the second punch 28 has a vertical direction with respect to a connecting portion between the plate material W and the half punched portion 15 (the punched portion 15A) by the end edge portion 28b and the inner edge portion 25b of the second die 25. Compressive stress is exerted on the joint, and the joint portion is work-hardened. In this state, the second punch 28 further presses the half punched portion 15 (the punched portion 15A) downward to gradually shear the connecting portion. Then, as shown in FIG. 9, the side wall surface Pa is gradually subjected to shearing as the second punch 28 moves further downward. That is, the side wall surface 15a of the portion (half punched portion 15) that becomes the punched portion 15A is also subjected to shearing. Accordingly, since the connecting portion between the plate material W and the half punched portion 15 (the punched portion 15A) is sheared while being work hardened by the second punch 28 and the second die 25, the side wall surface Pa of the plate material W and the punched portion The side wall surface 15a of the portion 15A is formed on a shear surface having a finer surface roughness than when the clearance C2 is set to a positive clearance.

  Further, when the second punch 28 moves to the bottom dead center position, as shown in FIG. 10, the connecting portion between the half punched portion 15 and the plate material W is completely formed by the pressing force of the second punch 28. To be sheared. As a result, the half punched portion 15 is punched from the plate material W to become a punched portion 15A, and a through hole P is punched and formed in the plate material W. At this time, the second punch 28 is close to the position where the lower surface 28a is separated from the upper surface 25a of the second die 25 by a distance dimension d3 of 12.5% in the thickness dimension d of the plate material W. Here, as described above, the droop Wc is formed on the lower surface Wb side of the plate member W. Therefore, even if the lower surface 28a of the second punch 28 is separated from the upper surface 25a of the second die 25 by the distance dimension d3 (that is, the state in which the plate material W is half-punched), the half-punched portion 15 (punched) The part 15A) is punched from the plate material W. Further, no “burr” is generated on the lower surface Wb side of the plate material W due to the punched portion 15A being punched. The drool Wd formed on the upper surface Wa of the plate material W is formed smaller than the droop Wc due to the compressive stress applied to the plate material W by the second punch 28 and the second die 25.

  Then, as shown in FIG. 11, the second punch 28 starts to move upward, while the pay pin 30 follows the second punch 28 and does not move upward. The second punch 28 is fixed at the bottom dead center position. Therefore, as shown in FIG. 12, even if the second punch 28 moves further upward, the piercing portion 30 is punched from the plate material W so that the punched portion 15A follows the second punch 28 and moves upward. Restrict movement. As shown in FIG. 13, when the second punch 28 moves to the top dead center position, the movement of the second punch 28 stops. Then, the payout pin 30 slides upward in the insertion hole 29 of the second punch 28 and stops when the lower surface 30a moves to a position corresponding to the lower surface 28a of the second punch 28 in the vertical direction. . Thereafter, the punched portion 15A is carried out of the press processing apparatus 11, and press processing having punches and dies having different sizes and shapes from the other processing apparatuses (for example, the punches 17 and 28 and the dies 20 and 25). Machine) to form a backing plate. Further, the plate material W from which the punched portion 15A is punched is also carried out of the press processing apparatus 11 and processed by another processing apparatus.

Therefore, in this embodiment, the following effects can be obtained.
(1) In the first step S1, if the clearance C1 between the first punch 17 and the first die 20 (first die hole 21) is set to be a positive clearance, There is a bug. That is, in this case, when the plate material (work) W is pressed upward by the first punch 17 in the first processing unit 13, there is a possibility that the pressed portion is broken and a fracture surface is formed in the plate material W. is there. However, in the present embodiment, since the clearance C1 is a negative clearance, it is possible to suppress the formation of a fracture surface in the plate material W in the first processing unit 13. Further, in the second processing unit 14, since the droop Wc is formed on the plate material W in the first step S <b> 1 by the first processing unit 13, the lower surface 28 a of the second punch 28 moves below the lower surface Wb of the plate material W. Even if not, it is possible to form the punched portion 15A from the plate W. At this time, since the clearance C2 is a negative clearance, the second punch 28 can be sheared with respect to most of the side wall surface Pa of the through hole P and the side wall surface 15a of the punched portion 15A. Therefore, when punching is performed on the plate material W, it is formed into a fractured surface shape in the punched surface (side wall surface Pa of the through hole P) along the punching direction of the portion punched in the plate material W without increasing the number of steps. As a result, it is possible to reduce the portion to be formed and to suppress occurrence of “burrs” in the plate material W.

  (2) In the first step S <b> 1 by the first processing unit 13, a half punching process is performed on a part to be punched in the plate material (workpiece) W. Therefore, even if the clearance C1 between the first punch 17 and the first die 20 is a negative clearance, the contact between the first punch 17 and the first die 20 can be avoided.

  (3) In the first step S1, if the distance dimension d2 between the upper surface 17a of the first punch 17 and the lower surface 20a of the first die 20 is 35.0% of the thickness dimension d of the plate material (workpiece) W If it is set to be smaller than the dimensions, there are the following problems. In other words, in this case, when the first punch 17 is moved by a stroke to perform the half blanking process on the plate material W, there is a possibility that the half punched portion 15 is cut from the plate material W. On the other hand, if the distance dimension d2 is set to be larger than the distance dimension of 87.5% in the thickness dimension d of the plate material (workpiece) W, there are the following problems. That is, in this case, in the second step S2, even if the second punch 28 pushes the half-cut portion 15 of the plate material W downward, the thickness of the connecting portion between the plate material W and the half-cut portion 15 is the present embodiment. It will be thicker than As a result, the load applied to the second punch 28 is increased when the half punched portion 15 is punched and the side wall surface Pa of the through hole P is sheared. However, in the present embodiment, since the distance dimension d2 is set to 80% of the thickness dimension d of the plate material (workpiece) W, the half punched portion 15 is cut from the plate material W in the first step S1. This can be suppressed, and the burden on the second punch 28 can be favorably reduced in the second step S2.

  (4) The droop Wc is formed on the lower surface Wb side of the plate material (workpiece) W in the first step S1. Therefore, in the second step S2, the punched portion 15A is punched from the plate material W by performing a half-punch process from the opposite direction to the half-punch process in the first step S1 on the periphery of the half-punch portion 15 of the plate material W. In this case, it is possible to suppress the occurrence of “burrs” in the plate material W.

  (5) In the second step S2, if the distance dimension d2 between the lower surface 28a of the second punch 28 and the upper surface 25a of the second die 25 is 25.0% of the thickness dimension d of the plate material (workpiece) W, If it is set to be larger than the dimensions, there are the following problems. That is, in this case, there is a possibility that the half punched portion 15 cannot be punched from the plate material W even if the second punch 28 moves to the bottom dead center position. However, in the present embodiment, since the distance dimension d3 is set to 12.5% of the thickness dimension d of the plate material W, the through hole P can be reliably punched and formed in the plate material W in the second step S2.

  (6) If the clearance (the width dimension of the negative clearance) C1 is set to be smaller than the 2.5% width dimension in the thickness dimension d of the plate material (workpiece) W, the first punch 17 The difference dimension between the diameter dimension D2 and the diameter dimension D3 of the second punch 28 becomes large. Therefore, the width of the shaving allowance in the plate material W becomes too wide in the second step S2, and as a result, when the punched portion 15A is punched out from the plate material W, there is a possibility that “burr” may occur in the plate material W. On the other hand, when the clearance C1 is set to be larger than the width dimension of 7.5% of the thickness dimension d of the plate material W, when the first punch 17 presses the plate material W upward, The load on the first punch 17 and the first die 20 is increased by the load based on the load. Therefore, there is a possibility that the lifetimes of the first punch 17 and the first die 20 are shortened. Further, when the plate material W is half-punched by the first punch 17, the plate material W may be warped. However, in this embodiment, the clearance C1 is set to a width dimension of 3.75% in the thickness dimension d of the plate material W. Therefore, it is possible to improve the life of the first punch 17 and the first die 20 and to suppress the warpage of the plate material W in the first step S1. In addition, when the punched portion 15A is punched from the plate material W in the second step S2, it is possible to suppress occurrence of “burrs” in the plate material W.

  (7) Since the end edge portion 17b of the first punch 17 and the inner edge portion 20b of the first die 20 are chamfered so as to form an arc shape, the plate material (workpiece) W is formed in the first step S1. The load applied to the first punch 17 and the first die 20 can be reduced when the half punching process is performed.

  (8) If the longitudinal cross-sectional shape of the edge portion 17b of the first punch 17 is processed so as to have an arc having a curvature radius larger than the curvature radius of 12.5% in the thickness dimension d of the plate (work) W. If so, there are the following problems. That is, when half-cutting is performed on the plate material W in the first step S1, the amount Wc formed on the plate material W becomes too large, and the punched portion 15A is punched from the plate material W in the second step S2. At this time, there is a possibility that the ratio of the sheared surface portion in the side wall surface Pa of the plate material W is reduced. Further, when the plate material W is half-punched, there is a possibility that the plate material W is warped in the direction opposite to the pressing direction (downward direction) by the first punch 17. However, in the present embodiment, the end edge portion 17b of the first punch 17 is processed so that the longitudinal cross-sectional shape thereof has an arc having a curvature radius of 4.0% in the thickness dimension d of the plate material (workpiece) W. . Therefore, it is possible to suppress warping of the plate material W when the plate material W is subjected to half-punching processing, and when the punched portion 15A is punched from the plate material W in the second step S2, the side wall surface of the plate material W is obtained. It can suppress that the ratio of the shear surface part in Pa reduces.

  (9) On the other hand, if the longitudinal cross-sectional shape of the edge 17b of the first punch 17 is processed so as to have an arc having a curvature radius smaller than the curvature radius of 2.5% in the thickness dimension d of the plate material W. If this is the case, the blade portion of the first punch 17 may be worn faster than in the present embodiment. However, in the present embodiment, the end edge portion 17b of the first punch 17 is processed so that the longitudinal cross-sectional shape thereof has an arc having a curvature radius of 4.0% in the thickness dimension d of the plate material (workpiece) W. Therefore, the life of the first punch 17 can be improved.

  (10) If the longitudinal cross-sectional shape of the inner edge portion 20b of the first die 20 is processed so as to have an arc having a radius of curvature larger than the radius of curvature of 12.5% in the thickness dimension d of the plate (work) W. If so, there are the following problems. That is, when the plate material W is subjected to half-punching processing in the first step S1, the plate material W (particularly the half-punched portion 15) is distorted, and the half-punched portion 15 is used as the punched portion 15A in the second step S2. Even if punching is performed, the punched portion 15A may not be used as a product. On the other hand, if the longitudinal cross-sectional shape of the inner edge portion 20b of the first die 20 is processed so as to have an arc having a curvature radius smaller than the curvature radius of 2.5% in the thickness dimension d of the plate material W, There is a possibility that the blade portion of the first die 20 is worn faster than in the case of the present embodiment. However, in the present embodiment, the inner edge portion 20b of the first die 20 is processed such that the longitudinal cross-sectional shape thereof has an arc having a curvature radius of 4.0% in the thickness dimension d of the plate material (workpiece) W. . For this reason, it is possible to prevent the plate material W from being distorted when the plate material W is half-punched, and to improve the life of the first die 20 favorably.

  (11) In the second step S2, if the clearance C2 is set to be a positive clearance, there are the following problems. That is, in this case, when the punched portion 15A is punched from the plate material W in the second step S2, there is a possibility that a “burr” occurs in the plate material W. On the other hand, when the clearance C2 is set to be larger than the width dimension of 5.0% in the thickness dimension d of the plate material W, when the second punch 28 presses the plate material W downward, The load on the second punch 28 and the second die 25 is increased by the load based on the load. Further, the second processing unit 14 is less likely to push the punched portion 15 </ b> A punched from the plate material W into the second die hole 26 of the second die 25. However, in this embodiment, since the clearance C2 is set to a width of 2.5% of the thickness d of the plate material W, the life of the second punch 28 and the second die 25 can be improved. In addition, when the punched portion 15A is punched from the plate material W in the second step S2, it is possible to suppress the occurrence of “burrs” in the plate material W. Further, the punched portion 15A can be easily pushed into the second die 25.

  (12) The second punch 28 has a similar cross-sectional shape when the second punch 28 is cut in a direction perpendicular to the vertical direction, and a cross-sectional shape obtained when the first punch 17 is cut in a direction perpendicular to the vertical direction. It is configured to have an enlarged shape. Therefore, a portion of the side wall surface Pa of the plate material (workpiece) W formed in a sheared surface shape by the first punch 17 in the first step S1 and a sheared surface shape formed by the second punch 28 in the second step S2. The portion formed in the shape of a sheared surface in the side wall surface Pa can be greatly increased by the formed portion. Similarly, the side wall surface 15a of the punched portion 15A can have a very large portion formed in a sheared surface shape.

  (13) If the diameter dimension D3 of the second punch 28 is larger than the total dimension of the diameter dimension D2 of the first punch 17 and the width dimension of 10.0% in the thickness dimension d of the plate material (workpiece) W. If it is set as such, there are the following problems. That is, when the second punch 28 punches the punched portion 15A from the plate material W in the second step S2, the edge portion 28b of the second punch 28 is moved to the first step S1 as compared with the case of the present embodiment. The part spaced apart from the half punching part 15 formed in this way is sheared. That is, the so-called shaving allowance becomes too wide. Therefore, when the punched portion 15A is punched from the plate material W in the second step S2, there is a possibility that “burr” may occur on the lower surface Wb side of the plate material W. However, in the present embodiment, the second punch 28 is formed such that the diameter dimension D3 thereof is a total dimension of the diameter dimension D2 of the first punch 17 and the width dimension of 8.0% in the thickness dimension d of the plate material W. Has been. Therefore, when the punched portion 15A is punched from the plate material W in the second step S2, it is possible to suppress the occurrence of “burrs” on the lower surface Wb side of the plate material W.

  (14) On the other hand, if the diameter dimension D3 of the second punch 28 is smaller than the total dimension of the diameter dimension D2 of the first punch 17 and the width dimension of 3.75% in the thickness dimension d of the plate material (workpiece) W. If it is set as such, there are the following problems. That is, when the punched portion 15A is punched from the plate material W in the second step S2, there is a possibility that a large amount of droop Wc may remain on the lower surface Wb side of the plate material W. However, in the present embodiment, the second punch 28 is formed such that the diameter dimension D3 thereof is a total dimension of the diameter dimension D2 of the first punch 17 and the width dimension of 8.0% in the thickness dimension d of the plate material W. Has been. Therefore, when the punched portion 15A is punched from the plate material W in the second step S2, the droop Wc remaining on the lower surface Wb side of the plate material W can be reduced.

  (15) Since the edge portion 28b of the second punch 28 is subjected to an arc-shaped chamfering process, the second punch 28 performs a punching process (half-cutting process) when the plate material (workpiece) W is punched. The load applied to the two punches 28 can be reduced satisfactorily. Further, when the second punch 28 punches the half punched portion 15 (the punched portion 15A) from the plate material W, the area of contact with the plate material W and the half punched portion 15 is widened. A compressive stress can be efficiently applied to the connecting portions. For this reason, the connecting portion is quickly cured by work, and the half punched portion 15 can be easily punched from the plate material W as the punched portion 15A.

  (16) In the second step S2, if the longitudinal cross-sectional shape of the edge portion 28b of the second punch 28 is an arc having a radius of curvature larger than the radius of curvature of 12.5% in the thickness dimension d of the plate material (workpiece) W If it is processed so as to have the following, there are the following problems. That is, in this case, when the punched portion 15A is punched from the plate material W in the second step S2, the plate material W may be distorted and the plate material W may not be used as a product. However, in the present embodiment, the end edge portion 28b of the second punch 28 is processed so that the longitudinal sectional shape thereof has an arc having a curvature radius of 4.0% in the thickness dimension d of the plate material W. Therefore, it is possible to prevent the plate material W from being distorted when the punched portion 15A is punched from the plate material W in the second step S2.

  (17) In the second step S2, if the longitudinal cross-sectional shape of the edge portion 28b of the second punch 28 has an arc having a curvature radius smaller than the curvature radius of 2.5% in the thickness dimension d of the plate material W, If it has been processed, there are the following problems. That is, in this case, the load applied to the second punch 28 in the second step S2 may be increased. However, in the present embodiment, the end edge portion 28b of the second punch 28 is processed so that the longitudinal sectional shape thereof has an arc having a curvature radius of 4.0% in the thickness dimension d of the plate material W. Therefore, the life of the second punch 28 can be extended.

  (18) Since the inner edge 25b of the second die 25 is arc-shaped chamfered, when the second punch 28 punches the plate material (workpiece) W (half punching), The load applied to the two dies 25 can be reduced well.

  (19) In the second step S2, if the longitudinal cross-sectional shape of the inner edge portion 25b of the second die 25 is an arc having a radius of curvature greater than the curvature radius of 5.0% in the thickness dimension d of the plate (work) W If it is processed so as to have the following, there are the following problems. That is, when the second die 25 as described above is used, it is necessary to provide the second punch 28 having a diameter dimension larger than the diameter dimension D3 of the second punch 28 of the present embodiment. Therefore, the difference (d1−D4) between the diameter dimension d1 of the punched portion 15A punched from the plate material W in the second step S2 and the diameter dimension D4 of the second die 25 is compared to the case of this embodiment. Become bigger. Therefore, it may be difficult to drop the punched portion 15 </ b> A in the second die hole 26 of the second die 25. However, in the present embodiment, the inner edge portion 25b of the second die 25 is processed so that the longitudinal cross-sectional shape thereof has an arc having a curvature radius of 4.0% in the thickness dimension d of the plate material W. Therefore, the punched portion 15 </ b> A punched from the plate material W can be easily pushed into the second die hole 26 of the second die 25.

  (20) When forming the half punched portion 15 in the plate material (work) W in the first step S1, the contact plate (contact member) 22 is driven by the first punch based on the biasing force of the spring (biasing means) 23. The part pressed by 17 is urged downward. Therefore, when forming the half punched portion 15 in the plate material W, it is possible to suppress the formation of “wrinkles” in the half punched portion 15.

  (21) The punched portion 15 </ b> A punched from the plate material (work) W in the second step S <b> 2 is restricted from moving upward together with the second punch 28 by the payout pin (movable member) 30. That is, the punching portion 30 can reliably separate the punched portion 15 </ b> A from the plate material W.

  (22) The plate material (work) W processed by the press processing apparatus 11 of the present embodiment and the respective side wall surfaces Pa and 15a of the punched portion 15A are processed into a sheared surface. Moreover, each of the side wall surfaces Pa and 15a is formed in a sheared surface shape having a small surface roughness without forming a “burr”. Therefore, the plate material W and the punched portion 15A are suitable for use in a backing plate for an automatic transmission having a relatively thick thickness with the side wall surfaces Pa and 15a as sliding surfaces.

  (23) Further, if a flaw is formed on the side wall surfaces Pa and 15a of the plate member (work) W and the punched portion 15A, there are the following problems. That is, in this case, when the plate material W and the punched portion 15A are bent, bending stress concentrates on the portions where the flaws are formed on the side wall surfaces Pa and 15a, and the plate material W and the punched portion 15A. Could be damaged. And the damaged board | plate material W and the to-be-punched part 15A will become inferior goods, and will become impossible to use as a product. However, no scratches are formed on the side wall surfaces Pa and 15a of the plate material W and the punched portion 15A that have been punched by the press working method of the present embodiment. Therefore, even if the plate material W and the punched portion 15A are bent after the second step S2, the plate material W and the punched portion 15A can be satisfactorily suppressed from being damaged.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the configuration of each processing unit is different from that of the first embodiment. Therefore, in the following description, parts different from those of the first embodiment will be mainly described, and the same or corresponding member configurations as those of the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. Shall.

  The press working apparatus 11 of the present embodiment is an apparatus for forming a through hole P (see FIG. 20) having a predetermined shape (in the present embodiment, a substantially circular cross section) in a plate material W made of a metal material (for example, iron). The 1st processing unit 13 and the 2nd processing unit 14 are provided. In the first processing unit 13, as shown in FIG. 16, a half punching process is performed on a portion of the plate material W where the through hole P is formed, and a projecting shape is formed upward from the plate material W. Is to be formed.

  Further, in the second processing unit 14, as shown in FIG. 20, the half punched portion 15 is punched to become a punched portion 15 </ b> A, and a through hole P is formed in the plate material W. At this time, the through hole P is formed by punching so that the side wall surface (punching surface along the punching direction) Pa is not a rough fracture surface but a shear surface. Further, the lower part of the through hole P is a large diameter part P1, and the upper part is a small diameter part P2 having a smaller diameter than the large diameter part P1. A backing plate is formed by further processing the punched portion 15A.

Next, the first processing unit 13 will be described below with reference to FIGS.
The first processing unit 13 has a first punch 17 mounted and fixed on the lower die 16, and the lower die 16 has a bottom dead center position and a top dead center position based on driving of the drive source. The stroke moves between them. Further, a first die 20 having a sex relationship with the first punch 17 is attached and fixed to the first processing unit 13 on the lower surface side of the upper die 19.

  As shown in FIG. 14, the first die 20 has a first die hole (insertion hole) 21 having a substantially circular cross section corresponding to the cross sectional shape (hole shape) of the through hole P. The first die hole 21 is set such that the diameter dimension D1 thereof is slightly smaller than the diameter dimension d1 of the large diameter portion P1 in the through hole P. Further, the inner edge portion 20b on the lower surface 20a side (side facing the plate material W) of the first die 20 is chamfered so as to have a so-called curved surface 20c. In addition, the longitudinal cross-sectional shape of the inner edge portion 20b of the first die 20 in this embodiment is a circular shape having a diameter dimension of 8.0% (for example, 0.08 mm) in the thickness dimension d (for example, 1 mm) of the plate material W. Chamfering is applied to form a part. That is, the curved surface 20c of the inner edge portion 20b of the first die 20 has a curvature having a length dimension of 4.0% in the thickness dimension d (for example, 1 mm) of the plate material W when the first die 20 is cut in the vertical direction. It is formed so as to form an arc shape having a radius (for example, 0.04 mm).

  Further, in the first die hole 21, a contact plate (contact member) 22 having a contact surface 22a that contacts the upper surface Wa of the plate material W and a spring as a biasing means (only one is shown in FIG. 14). The upper end of the spring 23 is supported by the upper mold 19 and the lower end of the spring 23 is supported by the contact plate 22. As shown in FIG. 15, when the contact plate 22 is not biased by the spring 23, the contact surface 22a and the lower surface 20a of the first die 20 are located at the same position in the vertical direction. Yes. Then, as shown in FIG. 16, when the half punching process using the first punch 17 and the first die 20 is started, the contact plate 22 is biased downward (plate material W side) by the spring 23. The half punching portion 15 is biased downward.

  The first punch 17 is formed to have a substantially cylindrical shape corresponding to the cross-sectional shape (hole shape) of the through hole P. The first punch 17 is chamfered at the edge 17b on the upper surface 17a side (side facing the plate material W) so as to have a so-called curved surface 17c. Therefore, when the plate material W is subjected to half-punching processing by moving the first punch 17 upward, as shown in FIG. 16, a curved surface is formed on the lower surface (one surface) Wb side of the plate material W. Wc is formed. Note that the longitudinal cross-sectional shape of the edge portion 17b of the first punch 17 in the present embodiment is a circular shape having a diameter of 40.0% (for example, 0.4 mm) in the thickness dimension d (for example, 1 mm) of the plate material W. Chamfering is applied to form a part. That is, the curved surface 17c of the edge portion 17b of the first punch 17 has a curvature having a length dimension of 20.0% in the thickness dimension d (for example, 1 mm) of the plate material W when the first punch 17 is cut in the vertical direction. It is formed so as to form an arc shape having a radius (for example, 0.2 mm).

  Further, as can be understood from FIG. 14, the first punch 17 is set so that its diameter dimension D2 is larger than the diameter dimension D1 of the first die hole 21 in the first die 20. That is, the clearance (clearance width dimension) C1 formed between the first punch 17 and the first die 20 (first die hole 21) having a sex relationship is a negative clearance (C1 = (D1-D2) / 2 <0). In the present embodiment, the first punch 17 is formed so that the clearance C1 has a width dimension (eg, 0.0375 mm) of 3.75% in the thickness dimension d (eg, 1 mm) of the plate material W. Accordingly, in the first punch 17 of the present embodiment, the difference between the diameter dimension D2 and the diameter dimension D1 of the first die hole 21 is twice the clearance C1 (that is, D1−D2 = 2 × C1). Is set to

Next, the first step S1 executed by the first processing unit 13 will be described below.
When the part to be punched in the plate material W (the part where the through hole P is formed) is arranged in the upper region of the first punch 17, the work pressing part moves the plate material W upward (on the first die 20 side). And the upper surface Wa of the plate material W is brought into contact with the lower surface 20a of the first die 20 and the contact surface 22a of the contact plate 22. Next, the first punch 17 moves upward from the bottom dead center position based on the drive of the hydraulic cylinder. Then, as shown in FIG. 15, the upper surface 17a of the first punch 17 (the surface facing the plate material W) abuts against the lower surface Wb of the plate material W, and the first punch 17 faces the abutted portion upward. Press. As a result, as shown in FIG. 16, the plate material W is formed with a half-cut portion 15 that protrudes toward the first die 20 (upward), and a droop Wc on the lower surface Wb side of the plate material W. It is formed. Thus, in the first processing unit 13, the first punch 17 and the first die 20 are relatively moved in the vertical direction, so that the part to be punched in the plate material W is subjected to half punching.

  Further, when the plate material W is half-punched by the first punch 17 and the first die 20, the plate material W includes an end edge portion 17 b of the first punch 17 and an inner edge portion 20 b of the first die 20. The compressive stress works in the vertical direction. At this time, since the clearance C1 is set to a negative clearance, the portion sandwiched between the end edge portion 17b and the inner edge portion 20b is work hardened by the compressive stress acting in the vertical direction. It is sheared gradually while being done. Further, a larger pressing force is applied to the end edge portion 17b of the first punch 17 and the inner edge portion 20b of the first die 20 than when the clearance C1 is set to a positive clearance. However, in the present embodiment, the end edge portion 17b of the first punch 17 and the inner edge portion 20b of the first die 20 are each chamfered in a so-called round shape, and thus chamfered. The lifetimes of the first punch 17 and the first die 20 are longer than in the case where there is not.

  Further, the contact plate 22 moves upward in a state in which the contact surface 22a and the upper surface Wa of the plate material W (half punched portion 15) are in contact with each other, based on the upward press against the plate material W by the first punch 17. To do. Then, the abutting plate 22 urges the half punched portion 15 downward based on the urging force of the spring 23. Therefore, a buckling phenomenon does not occur in the half punched portion 15 in the thickness direction (vertical direction) of the plate material W. That is, “wrinkles” do not occur in the half punched portion 15.

  When the first punch 17 moves to the top dead center position, the first punch 17 stops moving upward. At this time, the first punch 17 approaches the position where the upper surface 17a is separated from the lower surface 20a of the first die 20 by a distance dimension d2 of 20.0% in the thickness dimension d of the plate material W. Then, the first punch 17 moves to the bottom dead center position (see FIG. 14) and stops moving. That is, the first step S1 in the first processing unit 13 is completed. Thereafter, the pushing up of the plate material W by the work pressing portion is stopped, and the plate material W is separated from the first die 20. Then, the plate material W is sequentially fed from the first processing unit 13 into the second processing unit 14.

Next, the second processing unit 14 will be described below with reference to FIGS.
A second die 25 is attached and fixed on the lower mold 24 to the second processing unit 14. As shown in FIG. 17, the second die 25 is formed with a second die hole 26 having a substantially circular cross section corresponding to the cross sectional shape (hole shape) of the through hole P. The die hole 26 is set so that its diameter dimension D4 is slightly smaller than the diameter dimension d1 of the large diameter portion P1 in the through hole P and larger than the diameter dimension D1 of the first die hole 21. Yes. A second punch 28 having a male-female relationship with the second die 25 is attached and fixed to the second processing unit 14 on the lower surface side of the upper die 27, and the upper die 27 is used for driving the drive source. Based on this, the stroke is moved between the top dead center position and the bottom dead center position.

  The second punch 28 is formed to have a substantially cylindrical shape corresponding to the cross-sectional shape (hole shape) of the through hole P. Further, the second punch 28 has a diameter dimension D3 that is 8.0% of a width dimension (for example, 0.08 mm) of the thickness dimension d (for example, 1 mm) in the plate material W, compared to the diameter dimension D2 of the first punch 17. It is set to be smaller. That is, the second punch 28 has a similar cross-sectional shape when the second punch 28 is cut in a direction perpendicular to the vertical direction, and a cross-sectional shape when the first punch 17 is cut in a direction perpendicular to the vertical direction. It is configured to have a reduced shape. In addition, when the cross-sectional shape when the second punch 28 is cut in the direction perpendicular to the vertical direction and the cross-sectional shape when the first punch 17 is cut in the direction perpendicular to the vertical direction are overlapped in the vertical direction The distance dimension between the outer peripheral parts having similar shapes is 4.0% (for example, 0.04 mm) in the thickness dimension d (for example, 1 mm) of the plate material W.

  A chamfering process is performed on an end edge portion 28b on the lower surface 28a side (side facing the plate material W) of the second punch 28 so as to have a so-called curved surface 28c. Therefore, when the plate material W is punched by moving the second punch 28 downward, as shown in FIG. 21, a curved weave Wd is formed on the upper surface Wa side of the plate material W. The In addition, the longitudinal cross-sectional shape of the edge part 28b of the 2nd punch 28 in this embodiment is a circular shape used as the diameter dimension (for example, 0.08 mm) of 8.0% in the thickness dimension d (for example, 1 mm) of the board | plate material W. FIG. Chamfering is applied to form a part. That is, the curved surface 28c of the edge portion 28b of the second punch 28 has a curvature with a length dimension of 4.0% in the thickness dimension d (for example, 1 mm) of the plate material W when the second punch 28 is cut in the vertical direction. It is formed so as to form an arc shape having a radius (for example, 0.04 mm).

  Further, an insertion hole 29 extending in the vertical direction is formed through the second punch 28 at a substantially central portion thereof, and a payout pin (movable member) 30 is disposed in the insertion hole 29. The payout pin 30 is slidable in the vertical direction in the insertion hole 29 of the second punch 28 by a drive source (not shown) (for example, a hydraulic cylinder). Further, the payout pin 30 follows the second punch 28 and moves in a downward stroke until the pressing of the plate material W (half-punched portion 15) by the second punch 28 is completed. That is, when the pay pin 30 follows the second punch 28 and moves in a stroke toward the bottom dead center position, the lower surface 30a of the pay pin 30 is positioned in the vertical direction with the lower surface 28a of the second punch 28. It comes to correspond.

  Further, as can be understood from FIG. 17, the diameter dimension D3 of the second punch 28 is larger than the diameter dimension D4 of the second die hole 26 in the second die 25, and the first punch 17. Is set to be smaller than the diameter dimension D2. That is, the clearance (clearance width dimension) C2 formed between the second punch 28 and the second die 25 having a sex relationship is a negative clearance (C2 = (D4-D3) / 2 <0). Is set to In the present embodiment, the second die 25 is formed so that the clearance C2 has a width dimension (for example, 0.025 mm) of 2.5% in the thickness dimension d (for example, 1 mm) of the plate material W.

Next, the second step S2 executed by the second processing unit 14 will be described below.
Now, when the board | plate material W in which the half punching part 15 was formed in the said 1st processing unit 13 is conveyed in the 2nd processing unit 14, the half punching part 15 will be arrange | positioned under the 2nd punch 28 ( FIG. 17). At this time, the lower surface 30a of the pay pin 30 and the lower surface 28a of the second punch 28 are at the same position in the vertical direction. Then, when the second step S2 is started, as shown in FIG. 18, the second punch 28 and the payout pin 30 are moved downward toward the plate material W (half punched portion 15), and the half of the plate material W is moved. The extraction part 15 is pushed downward. Then, as shown in FIG. 19, it will be in the state by which a part of connection site | part of the said half-cut part 15 and the board | plate material W was cut | disconnected. That is, in the second step S2, the second punch 28 is moved toward the second die 25, so that the second punch 28 reverses the half-punched portion 15 of the plate material W to the half-punching process of the first step S1. It will be pressed from the direction.

  Then, as shown in FIG. 20, the second punch 28 pushes the half punched portion 15 further downward and starts shearing the plate material W. That is, the second punch 28 is vertically moved with respect to a connecting portion between the plate material W and the half punched portion 15 (the punched portion 15A) by the end edge portion 28b and the inner edge portion of the second die 25. The compressive stress is applied, and the joint portion is work-hardened. In this state, the second punch 28 further presses the half punched portion 15 (the punched portion 15A) downward to gradually shear the connecting portion.

  When the second punch 28 moves to the bottom dead center position, the connecting portion between the half punched portion 15 and the plate material W is completely sheared by the pressing force of the second punch 28. As a result, the half punched portion 15 is punched from the plate material W to become a punched portion 15A, and a through hole P is punched and formed in the plate material W. At this time, the second punch 28 is close to the position where the lower surface 28a is separated from the upper surface 25a of the second die 25 by a distance dimension d3 of 80.0% in the thickness dimension d of the plate material W. In addition, since the diameter dimension D3 of the second punch 28 is smaller than the diameter dimension D2 of the first punch 17, a small diameter portion P2 having a smaller diameter than the large diameter portion P1 is formed in the second step S2. Moreover, no “burr” is generated on the lower surface Wb side of the plate material W due to the punched portion 15A being punched. The drool Wd formed on the upper surface Wa of the plate material W is formed smaller than the droop Wc due to the compressive stress applied to the plate material W by the second punch 28 and the second die 25.

  Then, as shown in FIG. 21, the second punch 28 starts to move upward, while the payout pin 30 follows the second punch 28 and does not move upward. The second punch 28 is fixed at the bottom dead center position. Therefore, as shown in FIG. 22, even if the second punch 28 moves further upward, the piercing portion 30 is punched from the plate material W so that the punched portion 15A follows the second punch 28 and moves upward. Restrict movement. Then, as shown in FIG. 23, when the second punch 28 moves to the top dead center position, the movement of the second punch 28 stops. Then, the payout pin 30 slides upward in the insertion hole 29 of the second punch 28, and stops when the lower surface 30a moves to the same position in the vertical direction as the lower surface 28a of the second punch 28. .

  Thereafter, the punched portion 15A is carried out of the press processing apparatus 11, and press processing having punches and dies having different sizes and shapes from the other processing apparatuses (for example, the punches 17 and 28 and the dies 20 and 25). Machine) to form a backing plate. Further, the plate material W from which the punched portion 15A is punched is also carried out of the press processing apparatus 11 and processed by another processing apparatus.

In the present embodiment, the following effects can also be obtained.
(24) In the first step S1, if the distance dimension d2 between the upper surface 17a of the first punch 17 and the lower surface 20a of the first die 20 is 10.0% of the thickness dimension d of the plate material (workpiece) W If it is set to be smaller than the dimensions, there are the following problems. In other words, in this case, when the first punch 17 is moved by a stroke to perform the half blanking process on the plate material W, there is a possibility that the half punched portion 15 is cut from the plate material W. Further, since the clearance C1 is set to a negative clearance, the load on the first punch 17 and the first die 20 may be increased. On the other hand, if the distance dimension d2 is set to be larger than the distance dimension of 90.0% in the thickness dimension d of the plate (work) W, there are the following problems. That is, in this case, in the second step S2, even if the second punch 28 pushes the half-cut portion 15 of the plate material W downward, the thickness of the connecting portion between the plate material W and the half-cut portion 15 is the present embodiment. It will be thicker than As a result, the load applied to the second punch 28 is increased when the half punched portion 15 is punched and the side wall surface Pa of the through hole P is sheared. However, in the present embodiment, since the distance dimension d2 is set to 20.0% of the thickness dimension d of the plate material (workpiece) W, the half punched portion 15 is cut from the plate material W in the first step S1. This can be suppressed and the burden on the first punch 17 and the first die 20 can be reduced. Further, the burden on the second punch 28 can be satisfactorily reduced in the second step S2.

  (25) In the second step S2, if the distance dimension d2 between the lower surface 28a of the second punch 28 and the upper surface 25a of the second die 25 is larger than the distance dimension of 10.0% in the thickness dimension d of the plate material W. If it is set to be smaller, there are the following problems. That is, in this case, when the punched portion 15A is punched from the plate material W by the second punch 28, the portion of the peripheral surface (side surface) of the second punch 28 that comes into sliding contact with the side wall surface Pa of the plate material W increases. Therefore, the wear of the second punch 28 may be accelerated as compared with the case of the present embodiment. However, in the present embodiment, since the distance dimension d3 is set to 12.5% of the thickness dimension d of the plate material W, the through hole P can be surely punched and formed in the plate material W in the second step S2. The life of the second punch 28 can be improved.

  (26) If the longitudinal cross-sectional shape of the edge 17b of the first punch 17 is processed to have an arc having a radius of curvature larger than the radius of curvature of 25.0% in the thickness dimension d of the plate material (workpiece) W. If so, there are the following problems. That is, when half-cutting is performed on the plate material W in the first step S1, the amount Wc formed on the plate material W becomes too large, and the punched portion 15A is punched from the plate material W in the second step S2. At this time, there is a possibility that the ratio of the sheared surface portion in the side wall surface Pa of the plate material W is reduced. Further, when the plate material W is half-punched, there is a possibility that the plate material W is warped in the direction opposite to the pressing direction (downward direction) by the first punch 17. On the other hand, if the vertical cross-sectional shape of the edge portion 17b of the first punch 17 is processed so as to have an arc having a curvature radius smaller than the curvature radius of 12.5% in the thickness dimension d of the plate material W, There is a possibility that the blade portion of the first punch 17 is worn faster than in the case of the present embodiment. However, in the present embodiment, the end edge portion 17b of the first punch 17 is processed such that the longitudinal cross-sectional shape thereof has an arc having a curvature radius of 20.0% in the thickness dimension d of the plate material (workpiece) W. . Therefore, it is possible to suppress warping of the plate material W when the plate material W is subjected to half-punching processing, and when the punched portion 15A is punched from the plate material W in the second step S2, the side wall surface of the plate material W is obtained. It can suppress that the ratio of the shear surface part in Pa reduces. In addition, the life of the first punch 17 can be improved.

  (27) If the longitudinal cross-sectional shape of the inner edge portion 20b of the first die 20 is processed so as to have an arc with a radius of curvature larger than the radius of curvature of 12.5% in the thickness dimension d of the plate (work) W. If so, there are the following problems. That is, when the plate material W is subjected to half-punching processing in the first step S1, the plate material W (particularly the half-punched portion 15) is distorted, and the half-punched portion 15 is used as the punched portion 15A in the second step S2. Even if punching is performed, the punched portion 15A may not be used as a product. However, in the present embodiment, the inner edge portion 20b of the first die 20 is processed such that the longitudinal cross-sectional shape thereof has an arc having a curvature radius of 4.0% in the thickness dimension d of the plate material (workpiece) W. . Therefore, it is possible to prevent the plate material W from being distorted when the plate material W is subjected to half-punching.

  (28) On the other hand, if the longitudinal cross-sectional shape of the inner edge portion 20b of the first die 20 is processed so as to have an arc having a curvature radius smaller than the curvature radius of 2.5% in the thickness dimension d of the plate material W. If this is the case, the blade portion of the first die 20 may be worn faster than in the present embodiment. However, in the present embodiment, the inner edge portion 20b of the first die 20 is processed such that the longitudinal cross-sectional shape thereof has an arc having a curvature radius of 4.0% in the thickness dimension d of the plate material (workpiece) W. . For this reason, it is possible to prevent the plate material W from being distorted when the plate material W is half-punched, and to improve the life of the first die 20 favorably.

(29) In the second step S2, when the clearance C2 is set to be larger than the width dimension of 2.5% of the thickness dimension d of the plate material W, the second punch 28 presses the plate material W downward. When this occurs, the load on the second punch 28 and the second die 25 increases due to the load based on the pressure. Further, the second processing unit 14 is less likely to push the punched portion 15 </ b> A punched from the plate material W into the second die hole 26 of the second die 25. However, in this embodiment, since the clearance C2 is set to a width of 2.5% of the thickness d of the plate material W, the life of the second punch 28 and the second die 25 can be improved. In addition, when the punched portion 15A is punched from the plate material W in the second step S2, it is possible to suppress the occurrence of “burrs” in the plate material W. Further, the punched portion 15A can be easily pushed into the second die 25.
(30) The second punch 28 has a similar cross-sectional shape when the second punch 28 is cut in a direction perpendicular to the vertical direction, and a cross-sectional shape obtained when the first punch 17 is cut in a direction perpendicular to the vertical direction. It is configured to have a reduced shape. Therefore, in the second step S2, when the plate material (work) W is half punched by the second punch 28, the half punched portion 15 can be reliably punched as the punched portion 15A. Further, since the portion to be sheared by the second punch 28 is smaller than when the cross-sectional shape of the second punch 28 is larger than the cross-sectional shape of the first punch 17, the punched portion 15 </ b> A is punched from the plate material W. In this case, it is possible to suppress the formation of “burrs” on the lower surface Wb side of the plate material W.

  (31) If the difference between the diameter dimension D3 of the second punch 28 and the diameter dimension D2 of the first punch 17 is set to be larger than the width dimension of 10.0% in the thickness dimension d of the plate material (workpiece) W. If it is done, there are the following problems. That is, in this case, when the punched portion 15A is punched from the plate material W in the second step S2, the radial width of the step formed between the large diameter portion P1 and the small diameter portion P2 in the through hole P is the same. There was a possibility that the plate material W and the punched portion 15A could not be used as a product because of spreading too much. However, in the present embodiment, the second punch 28 is set so that the difference between the diameter dimension D3 of the second punch 28 and the diameter dimension D2 of the first punch 17 is 8.0% of the thickness dimension d of the plate material W. Therefore, it can suppress that the radial direction width | variety of the level | step difference between the said large diameter part P1 and the small diameter part P2 becomes so wide that it cannot use as a product.

In addition, you may change each said embodiment into the following other embodiment (another example).
In each of the above embodiments, the second machining unit 14 does not have to be provided with the payout pin 30.

In each of the above embodiments, the first processing unit 13 does not have to be provided with the contact plate 22 and the spring 23.
In each of the above embodiments, the inner edge 25b of the second die 25 has an arbitrary curvature radius (if the longitudinal cross-sectional shape is within a range of a curvature radius of 5.0% or less in the thickness dimension d of the plate material W) ( For example, chamfering may be performed so as to have an arc having a curvature radius of 5.0% in the thickness dimension d.

  In the first embodiment, the inner edge portion 25b of the second die 25 may be chamfered so as to form an oblique shape (so-called “C surface” shape). In this case, the inner edge portion 25b of the second die 25 is within a range of 5.0% or less in the thickness dimension d of the plate material (workpiece) W from the inner end portion thereof toward the radially outer side. Further, chamfering may be performed to the inside by an arbitrary length dimension (for example, a length dimension of 2% in the thickness dimension d).

  In each of the above embodiments, the end edge portion 28b of the second punch 28 is chamfered so that the longitudinal cross-sectional shape thereof is an arc shape with a radius of curvature having a length dimension of 12.5% or less of the thickness dimension d of the plate material W. It only needs to be processed. Further, the edge portion 28b of the second punch 28 is chamfered so that the longitudinal cross-sectional shape thereof has an arc in the range of the curvature radius of 2.5% to 12.5% in the thickness dimension d of the plate material W. It is even better if it is done. That is, the edge portion 28b of the second punch 28 is chamfered so that the longitudinal cross-sectional shape thereof has an arc having an arbitrary curvature radius (for example, a curvature radius of 5.0% in the thickness dimension d). It may be a thing.

  In the first embodiment, the second punch 28 has a width of 7.5% to 10.0% in the thickness dimension d of the plate material W in which the difference between the diameter dimension D3 and the diameter dimension D2 of the first punch 17 is As long as it is within the dimension range, the difference between the diameter dimension D3 and the diameter dimension D2 may be an arbitrary diameter dimension (for example, a width dimension of 9.0% in the thickness dimension d). .

  In the second embodiment, the difference between the diameter dimension D3 of the second punch 28 and the diameter dimension D2 of the first punch 17 is less than the width dimension of 5.0% in the thickness dimension d of the plate material W. If so, it may be formed such that the difference between the diameter dimension D3 and the diameter dimension D2 is an arbitrary diameter dimension (for example, a 1.0% width dimension in the thickness dimension d).

  In each of the above-described embodiments, the first punch 17 and the second punch 28 have the same cross-sectional shape when cut in a direction perpendicular to the up-down direction as the cross-sectional shape (hole shape) of the through hole P formed in the plate material W. Accordingly, each may be configured to have an arbitrary cross-sectional shape (for example, a polygonal cross-sectional shape).

  That is, in the first embodiment, the first punch 17 and the second punch 28 may be formed in a substantially square cross-sectional shape. Then, as shown in FIG. 24, the cross section of the first punch 17 (hereinafter referred to as “first punch cross section”) 17A and the cross section of the second punch 28 (hereinafter referred to as “second punch cross section”) 28A. Is the distance dimension da between the upper side (outer peripheral part) of the first punch section 17A and the upper side (outer peripheral part) of the second punch section 28A facing the upper side. . The distance dimension between the right side of the first punch section 17A and the right side of the second punch section 28A is a distance dimension da. In this case, the distance dimension between the lower side of the first punch section 17A and the lower side of the second punch section 28A, and the distance dimension between the left side of the first punch section 17A and the left side of the second punch section 28A are also distance dimensions. da. That is, the distance dimension da between the outer peripheral parts having similar shapes is the same distance dimension. Note that “up / down / left / right” here means “up / down / left / right” in FIG. 24.

  On the other hand, in the second embodiment, the first punch 17 and the second punch 28 may be formed in a substantially square cross section. Then, as shown in FIG. 25, the cross section of the first punch 17 (hereinafter referred to as “first punch cross section”) 17A and the cross section of the second punch 28 (hereinafter referred to as “second punch cross section”) 28A. Is the distance dimension db between the upper side (outer peripheral part) of the first punch section 17A and the upper side (outer peripheral part) of the second punch section 28A facing the upper side. . A distance dimension between the right side of the first punch section 17A and the right side of the second punch section 28A is a distance dimension db. In this case, the distance dimension between the lower side of the first punch section 17A and the lower side of the second punch section 28A, and the distance dimension between the left side of the first punch section 17A and the left side of the second punch section 28A are also distance dimensions. db. Here, “up, down, left and right” refers to “up, down, left and right” in FIG.

  In the first embodiment, the second punch 28 has an arbitrary width dimension (for example, the above-described width dimension) as long as the clearance C2 is within a width dimension of 5.0% or less in the thickness dimension d of the plate material W. (Width dimension of 1.0% in thickness dimension d) may be formed. Further, the clearance C2 may be “0 (zero)”.

  In the second embodiment, the second punch 28 has an arbitrary width dimension (for example, the above-described width dimension) as long as the clearance C2 is within a width dimension of 2.5% or less of the thickness dimension d of the plate material W. (Width dimension of 1.0% in thickness dimension d) may be formed. Further, the clearance C2 may be “0 (zero)”.

  In each of the above embodiments, the inner edge portion 20b of the first die 20 is arbitrary if the longitudinal cross-sectional shape thereof is within the range of the curvature radius of 2.5% to 12.5% in the thickness dimension d of the plate material W. May be chamfered so as to have an arc having a radius of curvature (for example, a curvature radius of 10.0% in the thickness dimension d).

  In the first embodiment, the edge portion 17b of the first punch 17 is chamfered so that the longitudinal cross-sectional shape thereof has an arc having a curvature radius of 12.5% or less in the thickness dimension d of the plate material W. It may be what was done. Further, the edge portion 17b of the first punch 17 is chamfered so that the longitudinal cross-sectional shape thereof has an arc having a curvature radius of 2.5% to 12.5% in the thickness dimension d of the plate material W. If better. That is, the end edge portion 17b of the first punch 17 may be chamfered so as to have an arc having an arbitrary curvature radius (for example, a curvature radius of 10.0% in the thickness dimension d). Good.

  -In the said 2nd Embodiment, if the edge part 17b of the 1st punch 17 has the longitudinal cross-sectional shape in the range of the curvature radius of 12.5%-25.0% in the thickness dimension d of the board | plate material W, it will be. Further, chamfering may be performed so as to have an arc with an arbitrary curvature radius (for example, a curvature radius of 15.0% in the thickness dimension d).

  In each of the embodiments, the first punch 17 has an arbitrary width dimension (for example, the thickness) as long as the clearance C1 is in the range of 2.5% to 7.5% of the width dimension d of the thickness W of the plate material W. The width d may be 3.0% of the dimension d).

  In the first embodiment, the vertical distance d3 between the lower surface 28a of the second punch 28 and the upper surface 25a of the second die 25 when the plate material W is half-punched by the second processing unit 14. May be set to an arbitrary distance dimension as long as it is within a range of 25.0% or less of the thickness dimension d of the plate material W. For example, the distance dimension d2 may be set to be 20.0% of the distance dimension in the thickness dimension d. Further, the end edge portion 28b of the second punch 28 and the inner edge portion 25b of the second die 25 are each chamfered. Therefore, in the second step S2, the second punch 28 may be moved by a stroke until the lower surface 28a thereof is at the same position as the upper surface 25a of the second die 25 in the vertical direction.

  In the second embodiment, the vertical distance d3 between the lower surface 28a of the second punch 28 and the upper surface 25a of the second die 25 when the plate material W is half-punched by the second processing unit 14. May be set to an arbitrary distance dimension as long as the distance dimension is 10.0% or more in the thickness dimension d of the plate material W. For example, the distance dimension d2 may be set to be 87.5% of the distance dimension d.

  In the first embodiment, the vertical distance d2 between the upper surface 17a of the first punch 17 and the lower surface 20a of the first die 20 when the plate material W is half-punched by the first processing unit 13. May be set to an arbitrary distance dimension as long as it is within the range of the distance dimension of 35.0% to 87.5% in the thickness dimension d of the plate material W. For example, the distance dimension d2 may be set to be 40% of the distance dimension d.

  In the second embodiment, the vertical distance d2 between the upper surface 17a of the first punch 17 and the lower surface 20a of the first die 20 when the sheet material W is half-punched by the first processing unit 13. May be set to be an arbitrary distance dimension as long as it is within a range of a distance dimension of 10.0% to 90.0% in the thickness dimension d of the plate material W. For example, the distance dimension d2 may be set to be 80% of the distance dimension d.

In each of the above embodiments, the first processing unit 13 may punch a scrap material (a portion to be the half punched portion 15 in the present embodiment) from the plate material W.
-In the said 1st Embodiment, as shown to Fig.26 (a) (b) (c), a press work apparatus is actualized to the press work apparatus 11 which forms the notch part 41 with respect to the workpiece | work 40. Also good. That is, in the first step S <b> 1, the half-cut portion 42 is formed in a portion where the notch 41 is formed in the workpiece 40 (a portion to be punched). In the second step S2, the half-cut part 42 of the workpiece 40 is punched and the side wall surface 41a of the notch part 41 is sheared. As a result, the workpiece 40 is formed with a notch portion 41 having a side wall surface 41a which is mostly processed into a sheared surface.

  -In the said 2nd Embodiment, as shown to Fig.27 (a) (b) (c), a press work apparatus is actualized in the press work apparatus 11 which forms the notch part 51 with respect to the workpiece | work 50. Also good. That is, in the first step S1, the half-cut portion 52 is formed in a portion of the workpiece 50 where the cutout portion 51 is formed (a portion to be punched). In the second step S2, the half-cut portion 52 of the workpiece 50 is punched and the side wall surface 51a of the cutout portion 51 is sheared. As a result, the workpiece 50 is formed with a notch 51 having a side wall surface 51a that is mostly processed into a sheared surface.

  In each of the embodiments described above, the press working apparatus 11 includes the first punch 17 attached and fixed to the lower surface side of the upper die 19 in the first working unit 13, and the second punch 28 in the second working unit 14 is the first punch The structure fixed to the upper surface side of the lower mold | type 24 in the 2 process unit 14 may be sufficient. In this case, in the first step S1, as shown in FIGS. 26 (a) and 27 (a), half-cut portions 42, 52 that project downward are formed on the workpieces 40, 50. become.

  In the press working apparatus 11, the first punch 17 is attached and fixed to the lower surface side of the upper die 19 in the first working unit 13, and the second punch 28 is attached to the lower surface side of the upper die 27 in the second working unit 14. It may be a configuration that is fixedly mounted. In this case, the workpieces 40 and 50 in which the half-cut portions 42 and 52 are formed by the first step S1 of the first processing unit 13 are arranged so that the convex portions of the half-cut portions 42 and 52 face upward. It is necessary to carry it into the second processing unit 14 after being reversed.

  In each of the above embodiments, the press working device 11 may be embodied to form an arbitrary molded part (for example, a multi-plate clutch) as long as it is a molded part of an automatic transmission. Further, it may be embodied to form an element of a continuously variable transmission belt, or may be embodied to form a plate of a multi-plate brake. That is, any molded part may be formed as long as the part is not a thin plate but a relatively thick plate.

The schematic front view of the press work apparatus in 1st Embodiment. FIG. 3 is a schematic cross-sectional view showing a part of the first processing unit in the first embodiment. The schematic sectional drawing which shows a mode that the 1st punch contact | abutted to the board | plate material in the 1st process unit of 1st Embodiment. The schematic sectional drawing which shows a mode that the 1st punch most closely approached the 1st die | dye in the 1st processing unit of 1st Embodiment. The schematic sectional drawing which shows a part of 2nd process unit in 1st Embodiment. The schematic sectional drawing which shows a mode that the stroke movement started to the 2nd die | dye side of the 2nd punch in the 2nd processing unit of 1st Embodiment. The schematic sectional drawing which shows a mode that the 2nd punch presses the half punching part of a board | plate material in the 2nd processing unit of 1st Embodiment. The schematic sectional drawing which shows a mode that the shearing process to the site | part used as the side wall surface of a through-hole was started in the 2nd processing unit of 1st Embodiment. The schematic sectional drawing which shows a mode that the shearing process to the site | part used as the side wall surface of a through-hole is performed in the 2nd processing unit of 1st Embodiment. The schematic sectional drawing which shows a mode that the half punching process by the 2nd process unit of 1st Embodiment was complete | finished, and the to-be-punched part was punched out from the backing plate. The schematic sectional drawing which shows a mode that the stroke movement to the upper direction of the 2nd punch was started in the 2nd processing unit of 1st Embodiment. The schematic sectional drawing which shows a mode that the stroke movement to the upper direction of the 2nd punch is performed in the 2nd processing unit of 1st Embodiment. The schematic sectional drawing which shows a mode that the 2nd process by the 2nd process unit of 1st Embodiment was complete | finished. The schematic sectional drawing which shows a part of 1st process unit in 2nd Embodiment. The schematic sectional drawing which shows a mode that the 1st punch contact | abutted to the board | plate material in the 1st process unit of 2nd Embodiment. The schematic sectional drawing which shows a mode that the 1st punch most closely approached the 1st die | dye in the 1st process unit of 2nd Embodiment. The schematic sectional drawing which shows a part of 2nd process unit in 2nd Embodiment. The schematic sectional drawing which shows a mode that the stroke movement started to the 2nd die | dye side of the 2nd punch in the 2nd processing unit of 2nd Embodiment. The schematic sectional drawing which shows a mode that a 2nd punch presses the half punching part of a board | plate material in the 2nd processing unit of 2nd Embodiment. The schematic sectional drawing which shows a mode that the to-be-punched part was punched from the board | plate material after the half punching process by the 2nd processing unit of 2nd Embodiment was complete | finished. The schematic sectional drawing which shows a mode that the stroke movement to the upper direction of the 2nd punch was started in the 2nd processing unit of 2nd Embodiment. The schematic sectional drawing which shows a mode that the stroke movement to the upper direction of the 2nd punch is performed in the 2nd processing unit of 2nd Embodiment. The schematic sectional drawing which shows a mode that the 2nd process by the 2nd process unit of 2nd Embodiment was complete | finished. The schematic diagram which shows the state which piled up the cross section of the 1st punch of another example in the 1st Embodiment, and the cross section of the 2nd punch typically. The schematic diagram which shows the state which piled up the cross section of the 1st punch of another example in the 2nd Embodiment, and the cross section of the 2nd punch typically. (A) Schematic sectional drawing which shows a mode that the half-cutting process was given to the site | part in which the notch part in a workpiece | work is formed in another example in 1st Embodiment, (b) is a notch part formed in a workpiece | work. The schematic sectional drawing which shows a mode that was done, (c) is a schematic plan view which shows a mode that the notch part was formed in the workpiece | work. (A) Schematic sectional drawing which shows a mode that the half-cutting process was given to the site | part in which the notch part in a workpiece | work is formed in another example in 2nd Embodiment, (b) has a notch part formed in a workpiece | work. The schematic sectional drawing which shows a mode that was done, (c) is a schematic plan view which shows a mode that the notch part was formed in the workpiece | work.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Press processing apparatus, 13 ... 1st processing unit, 14 ... 2nd processing unit, 15, 42, 52 ... Half punching part (part | part which was half punched), 16, 24 ... Lower mold | type, 17 ... 1st punch , 17b ... end edge part, 17c ... curved surface, 19, 27 ... upper die, 20 ... first die, 20b ... inner edge part, 20c ... curved surface, 21 ... first die hole (insertion hole), 22 ... contact plate (Contact member), 22a ... contact surface, 23 ... spring (biasing means), 25 ... second die, 25b ... inner edge, 25c ... curved surface, 28 ... second punch, 28b ... end edge, 28c ... curved surface, 29 ... insertion hole, 30 ... dispensing pin (movable member), 40, 50 ... workpiece, C1 ... clearance (clearance between first punch and first die), C2 ... clearance (second punch and second die) ), D: plate thickness, d2: first pan Is the distance between the lower surface of the first die and the upper surface of the first punch when d approaches the first die, d3... The upper surface of the second die and the second die when the second punch approaches the second die. 2 Distance dimension between bottom surfaces of punches, da, db ... distance dimensions between outer peripheral parts having similar shapes, S1 ... 1st step, S2 ... 2nd step, W ... plate material (work), Wa ... Upper surface (other surface), Wb ... lower surface (one surface).

Claims (32)

It is a press working device that punches the work by placing the work between the punch and the die and moving the punch and the die relative to each other,
The press working apparatus includes a first working unit and a second working unit, and the first working unit has a first punch and a first die, and the first punch has a clearance from the first die. It is set to be a negative clearance, and is installed so as to approach from the one surface side to the other surface side of the workpiece,
The second processing unit includes a second punch and a second die, and the second punch is set so that a clearance with the second die is zero or a negative clearance, and other than the workpiece. A press working device that is installed so as to approach from one side to the other side. 2. The press working apparatus according to claim 1, wherein the first working unit performs a half punching process on a part to be punched in the workpiece by relatively moving the first punch and the first die in a vertical direction. When the first punch is relatively close to the first die, the first processing unit is separated from the first die by a distance dimension of 35.0% to 87.5% in the thickness dimension of the workpiece. The press working apparatus according to claim 2, wherein the first punch is configured to approach to a separated position. When the first punch is relatively close to the first die, the first processing unit is separated from the first die by a distance dimension of 10.0% to 90.0% in the thickness dimension of the workpiece. The press working apparatus according to claim 2, wherein the first punch is configured to approach to a separated position. The second machining unit moves the second punch and the second die relative to each other in the up-down direction, so that the half of the first machining unit is half-cut in the workpiece by the first machining unit. Of the second to fourth aspects, the first and second punching portions of the workpiece are punched by half-punching from the opposite direction to the punching and half-cutting by the second processing unit. The press processing apparatus as described in any one. When the second punch is relatively close to the second die, the second processing unit is separated from the second die by a distance dimension equal to or less than a distance dimension of 25.0% in the thickness dimension of the workpiece. The press working apparatus according to claim 5, wherein the second punch is configured to approach to a position where it has been moved. When the second punch is relatively close to the second die, the second processing unit is separated from the second die by a distance dimension of 10.0% or more of the thickness dimension of the workpiece. The press working apparatus according to claim 5, wherein the second punch is configured to approach to a position where it has been moved. The first punch is formed such that a width dimension of a clearance with the first die is 2.5% to 7.5% of a thickness dimension of the workpiece. The press processing apparatus as described in any one of these. 2. The chamfering process is performed on the end edge of the first punch facing the work and the inner edge of the first die facing the work so as to have a curved surface. The press working apparatus according to any one of claims 8 to 9. The curved surface of the edge of the first punch facing the workpiece has a radius of curvature equal to or less than the length of 12.5% of the thickness of the workpiece when the first punch is cut in the vertical direction. The press working apparatus according to claim 9, wherein chamfering is performed so as to form an arc shape. The curved surface of the edge portion of the first punch facing the workpiece has a length dimension of 2.5% to 12.5% of the thickness dimension of the workpiece when the first punch is cut in the vertical direction. The press working apparatus according to claim 10, wherein the press working apparatus is formed in an arc shape having a radius of curvature. The curved surface of the edge portion of the first punch facing the workpiece has a length dimension of 12.5% to 25.0% of the thickness dimension of the workpiece when the first punch is cut in the vertical direction. The press working apparatus according to claim 9, wherein chamfering is performed so as to form an arc shape having a radius of curvature. The curved surface of the inner edge of the first die facing the workpiece has a radius of curvature equal to or less than the length of 12.5% of the thickness of the workpiece when the first die is cut in the vertical direction. The press working apparatus according to any one of claims 9 to 12, wherein chamfering is performed so as to form an arc shape. The curved surface of the inner edge on the side facing the workpiece in the first die has a length dimension of 2.5% to 12.5% in the thickness dimension of the workpiece when the first die is cut in the vertical direction. The press working apparatus according to claim 13, wherein chamfering is performed so as to form an arc having a radius of curvature. The second punch is formed so that a width dimension of a clearance with the second die is a width dimension equal to or less than 5.0% of a thickness dimension of the workpiece. The press processing apparatus as described in any one of them. The second punch is formed so that a width dimension of a clearance with the second die is a width dimension of 2.5% or less of a thickness dimension of the workpiece. The press processing apparatus as described in any one of them. In the second punch, the cross-sectional shape when the second punch is cut in a direction perpendicular to the vertical direction is similar to the cross-sectional shape when the first punch is cut in a direction perpendicular to the vertical direction. The press processing apparatus as described in any one of Claims 1-16 comprised so that a shape may be made. The second punch overlaps in a vertical direction a cross-sectional shape when the second punch is cut in a direction perpendicular to the vertical direction and a cross-sectional shape when the first punch is cut in a direction perpendicular to the vertical direction. 18. The press according to claim 17, wherein when combined, the distance between the outer peripheral parts having similar shapes is a distance dimension equal to or less than 5.0% of the thickness dimension of the workpiece. Processing equipment. The second punch overlaps in a vertical direction a cross-sectional shape when the second punch is cut in a direction perpendicular to the vertical direction and a cross-sectional shape when the first punch is cut in a direction perpendicular to the vertical direction. The distance dimension between the outer peripheral parts which make a mutually similar shape when it puts together is comprised so that it may become a distance dimension of 3.75%-5.0% in the thickness dimension of a workpiece | work. Press processing equipment. In the second punch, the cross-sectional shape when the second punch is cut in a direction perpendicular to the vertical direction is similar to the cross-sectional shape when the first punch is cut in a direction perpendicular to the vertical direction. The press processing apparatus as described in any one of Claims 1-16 comprised so that a shape may be made. The second punch overlaps in a vertical direction a cross-sectional shape when the second punch is cut in a direction perpendicular to the vertical direction and a cross-sectional shape when the first punch is cut in a direction perpendicular to the vertical direction. 21. The press according to claim 20, wherein when combined, a distance dimension between outer peripheral parts having similar shapes is a distance dimension equal to or less than a distance dimension of 5.0% of a workpiece thickness dimension. Processing equipment. The press working apparatus according to any one of claims 1 to 21, wherein a chamfering process is performed on an end edge portion of the second punch facing the workpiece so as to have a curved surface. The curved surface of the edge of the second punch facing the workpiece has a radius of curvature equal to or less than the length of 12.5% of the thickness of the workpiece when the second punch is cut in the vertical direction. The press working apparatus according to claim 22, wherein chamfering is performed so as to form an arc. The curved surface of the edge of the second punch facing the workpiece has a length dimension of 2.5% to 12.5% of the workpiece thickness dimension when the second punch is cut in the vertical direction. 24. The press working apparatus according to claim 23, wherein chamfering is performed so as to form an arc shape having a radius of curvature. The press working apparatus according to any one of claims 1 to 24, wherein a chamfering process is performed on an inner edge portion of the second die on a side facing the workpiece. The inner edge of the second die facing the workpiece is chamfered so as to form an oblique shape, and the inner edge of the second die has a thickness of the workpiece from the inner edge. 26. The press working apparatus according to claim 25, wherein chamfering is performed up to a length dimension of 5.0% or less in dimension. The inner edge of the second die facing the workpiece is chamfered so as to have a curved surface, and the curved surface of the inner edge of the second die moves the second die in the vertical direction. 26. The press working apparatus according to claim 25, wherein when cut into pieces, chamfering is performed so as to form an arc shape having a radius of curvature equal to or less than a length dimension of 5.0% of a thickness dimension of the workpiece. In the first die, an insertion hole is formed penetrating in the vertical direction, and in the insertion hole, a contact member having a contact surface that contacts a workpiece disposed in the first processing unit; The pressing apparatus according to any one of claims 1 to 27, further comprising an urging unit that urges the contact member toward the workpiece. An insertion hole extending in the vertical direction is formed through the second punch, and a movable member that is movable in the vertical direction in the insertion hole is provided in the second processing unit. The press working apparatus according to any one of claims 28. 30. The press working apparatus according to any one of claims 1 to 29, which is used when manufacturing a backing plate for an automatic transmission. A press working method in which a punch and a die are moved relative to each other to punch a workpiece.
Using a first punch and a first die having a male and female relationship, the clearance between the first punch and the first die is set to a negative clearance, and the first punch is placed on the workpiece with respect to the first die. A first step of performing a half-cutting process on a part to be punched in the workpiece by approaching from one side to the other side;
Using a second punch and a second die having a male and female relationship, the clearance between the second punch and the second die is set to zero or negative clearance, and the second punch is set to the second die with respect to the second die. By approaching from the other surface side of the workpiece toward the one surface side, the half-cutting process from the direction opposite to the half-cutting process of the first step is performed on the part of the workpiece that has been half-punched in the first step. And a second step of punching out the part that has been half-punched in the first step from the workpiece. 32. The press working method according to claim 31, which is used when manufacturing a backing plate for an automatic transmission.

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