JP4507530B2 - Press mold - Google Patents

Description

The present invention relates to a press die.

  2. Description of the Related Art Conventionally, there is known a press die that punches holes by a punch for a workpiece disposed between a stripper plate and a die plate. There is a manufacturing method in which a stripper plate and a die plate are processed at the same time in order to increase the alignment accuracy of each plate of the press die (for example, Patent Document 1).

  In the press die manufacturing method of Patent Document 1, a stripper plate and a die plate that are in a fitting relationship with a punch are overlapped, and a hole is simultaneously formed by wire discharge using a positioning pin. This attempts to minimize the axial misalignment of each hole formed in the die plate opposed to each hole formed in the stripper plate.

  By the way, when the clearance is not provided in the hole of the die plate with respect to the punch, the punched hole is formed in the workpiece, but there is a possibility that the punch is damaged and the die plate is worn. More specifically, as shown in FIG. 11, even when the axial center C21 of the punch 51 includes an allowable tolerance with respect to the XZ plane and is attached to the fifth position P5, the Y axis increases as the distance from the reference position P0 increases. The positional deviation in the axial direction becomes large. FIG. 12 is a main part projection in which the positional deviation in the Y-axis direction of the punch 51 at positions corresponding to the sixth position P6 and the seventh position P7 is projected together with the shapes of the hole 53 of the stripper plate 52 and the hole 55 of the die plate 54. FIG. A region A21 indicates a projected portion of the inner diameter φD11 of the hole 53 and the hole 55 at positions corresponding to the reference position P0, the sixth position P6, and the seventh position P7 on the Z-axis. A region A22 shows a projected portion of the outer diameter φD12 of the punch 51 extending in the Z-axis direction at the reference position P0. A region A23 shows a projected portion of the outer diameter φD12 of the punch 51 at a position corresponding to the sixth position P6 that is separated from the reference position P0 by the distance ΔH1. A region A24 shows a projected portion of the outer diameter φD12 of the punch 51 at a position corresponding to the seventh position P7 that is separated from the sixth position P6 by the distance ΔH2. As shown in FIG. 12, a region A <b> 25 where the region A <b> 23 and the region A <b> 24 protrude from the region A <b> 21 is a portion where the punch 51 hits the die plate 54.

Therefore, a method is proposed in which the hole 55 of the die plate 54 and the hole 53 of the stripper plate 52 are simultaneously processed, and then the stripper plate 52 is removed to increase the inner diameter of the hole 55 of the die plate 54 as shown in FIG. (For example, Patent Document 2). By this method, a clearance for sliding the punch 51 in the hole 55 of the die plate 54 can be secured.
Japanese Patent Laid-Open No. 5-115929 Japanese Patent No. 3014965

  However, in this manufacturing method, the stripper plate 52 is once removed and additional processing is performed on the die plate 54, and then the alignment between the stripper plate 52 and the die plate 54 must be performed again. However, it is difficult to accurately perform this alignment, and an error is caused in the axis C22 of the hole in the stripper plate opposite to the axis C23 of the hole in the die plate, which affects the machining accuracy of the product. End up.

An object of the present invention is to provide a press die that can finish a product with high processing accuracy without performing additional machining on a die plate.

A press die according to the present invention is a press die for punching a workpiece disposed between a stripper plate and a die plate by a vertical movement of a punch accompanying a vertical movement of a press mechanism. The punch is formed with holes having the same diameter as the die plate, and the punch includes a body having a first diameter that is a diameter at which the base end side of the punch is guided by the stripper plate, A tip having a second diameter smaller than the first diameter and having a length in the axial direction longer than the thickness of the workpiece, and when the press mechanism is at the lowest position, The joint surface between the body portion and the tip portion was disposed above the lower surface of the stripper plate .

  According to the present invention, since the diameter of the punch end to be punched is smaller than the diameter of the base end of the punch, the opposing holes of the stripper plate and the die plate are formed to have the same diameter. However, there is no need for additional work to provide clearance on the die plate. For this reason, it is not necessary to align the stripper plate and the die plate after the additional machining, so that a positional deviation occurs between the axis of the hole formed in the stripper plate and the axis of the hole formed in the die plate. Absent. Therefore, the punch that slides through the hole of the stripper plate and the hole of the die plate can perform the drilling process with high accuracy on the workpiece.

  The punch has a first diameter that is guided by the stripper plate on the base end side of the punch, and a second diameter that is smaller than the first diameter on the tip end side of the punch. . Therefore, even if the second diameter is displaced in the horizontal direction, it does not interfere with the hole in the die plate. Therefore, breakage of the punch and wear of the die plate can be prevented.

In this press die, the difference between the second diameter and the diameter of the hole in the die plate is a clearance amount required according to the thickness of the workpiece.
According to this invention, the clearance amount according to the thickness of the workpiece can be secured in the punch itself. Therefore, the punch can slide without interfering with the hole of the die plate.

In this press die, the clearance amount is greater than 0 and not more than 20% of the thickness of the workpiece.
According to the present invention, such a clearance amount can prevent at least breakage of the punch and wear of the die plate when drilling the workpiece.

In this press die, the clearance amount is not less than 5% and not more than 10% of the thickness of the workpiece.
According to this invention, a more appropriate clearance can be ensured, and the punched hole formed in the workpiece can be finished with higher processing accuracy.

Hereinafter, embodiments of a press die embodying the present invention will be described with reference to FIGS.
1 is a perspective view of a press die, FIG. 2 is a cross-sectional view of the press die, and FIG. 3 is a perspective view of each mold used for the press die.

  As shown in FIG. 1, the press die 10 of the present embodiment includes an upper die set 11 attached to a press mechanism (not shown) that can move up and down in the direction of the arrow, and a lower die attached on a pedestal of the press mechanism. A set 12 and a plurality of guide shafts 13 are provided. As shown in FIG. 2, guide shafts 13 are fixed in the vicinity of four corners of the lower die set 12 so that the guide shaft 13 guides the upper die set 11 in the vertical direction with respect to the lower die set 12. It has become. The upper die set 11 includes an upper mounting plate 16 having a guide hole 15 for guiding the guide shaft 13 in the vertical direction, and a punch plate 17 disposed on the lower surface of the upper mounting plate 16. Near the center of the upper mounting plate 16, a plurality of stepped slide holes 18 whose lower portions are reduced in diameter are formed, and on the lower surface of the upper mounting plate 16, a plurality of female screw portions 19 are formed. In the punch plate 17, a through hole 20 is formed facing the female screw portion 19 of the upper mounting plate 16, and a through hole 21 is formed facing the slide hole 18 of the upper mounting plate 16. The fixing bolt 22 passes through the through hole 20 and is screwed into the female screw portion 19 of the upper mounting plate 16, whereby the punch plate 17 is fixed to the upper mounting plate 16. Further, a stepped through hole 23 having a reduced diameter at the bottom is formed in the center of the punch plate 17. A plurality of punches 24 protruding toward the punch plate 17 are disposed in the through hole 23.

Next, the punch 24 disposed in the through hole 23 will be described. As shown in FIG. 4, the punch 24 is provided with a cylindrical body portion 24a, a base end portion 24b, and a front end portion 24c having three different diameters continuously provided on the same axis. The trunk portion 24a has a first diameter φD12. A base end 24b having a diameter larger than that of the body 24a is formed at one end of the body 24a.
Is sized to fit into the through hole 23. Further, a first flat surface portion K1 is formed at the other end of the body portion 24a, and a distal end portion 24c having a diameter smaller than that of the body portion 24a is formed at the first flat surface portion K1. The distal end portion 24c has a second diameter φD13 smaller than the first diameter φD12, and the second planar portion is located at the end of the distal end portion 24c opposite to the end facing the first planar portion K1. K2 is formed.

  As shown in FIGS. 2 and 3, a stripper plate 26 having a hole 25 formed at a position facing the punch 24 is disposed below the punch plate 17. The hole 25 is formed slightly larger than the body portion 24 a of the punch 24. In the state where the press mechanism is at the uppermost position, the hole 25 accommodates one end of the body portion 24 a and the tip end portion 24 c of the punch 24. The stripper plate 26 is formed with female screw portions 27 at positions facing each other of the through holes 21 of the punch plate 17. The stripper plate 26 is fixed to the upper mounting plate 16 so that the guide bolt 28 accommodated in the slide hole 18 passes through the through hole 21 and is screwed with the female screw portion 27. A compression spring 29 is mounted between the punch plate 17 and the stripper plate 26 and around the guide bolt 28, and the stripper plate 26 is biased downward by the compression spring 29. The lower surface of the stripper plate 26 includes a third flat surface portion K3 for press-contacting the workpiece W.

  Therefore, when the press mechanism is lowered and the stripper plate 26 is placed on the die plate 31, when the press mechanism is further lowered, the stripper plate 26 gradually presses the die plate 31 by the urging force of the compression spring 29. When the pressing force of the press mechanism becomes larger than the urging force of the compression spring 29, the punch 24 fixed to the punch plate moves toward the stripper plate 26. Therefore, the body portion 24 a and the tip portion 24 c of the punch 24 accommodated in the hole 25 slide in the hole 25.

  On the other hand, the lower die set 12 includes a lower mounting plate 30 and a die plate 31 installed on the lower mounting plate 30. A plurality of through holes 33 are formed in the vicinity of the center of the lower mounting plate 30, and a plurality of female screw portions 34 are formed around the through holes 33. The die plate 31 is provided with a stepped through hole 35 whose diameter is reduced at the lower portion so as to face the female thread portion 34 formed in the lower mounting plate 30. The fixing bolt 22 passes through the through hole 35 and is screwed into the female thread portion 34 of the lower mounting plate 30, whereby the die plate 31 is fixed to the lower mounting plate 30. In the center of the die plate 31, a plurality of holes opposite to the through holes 33 formed in the die plate 31 and opposite to the holes 25 formed in the stripper plate 26 and having the same inner diameter as the holes 25. A hole 36 is formed. The holes 25 formed in the stripper plate 26 and the holes 36 formed in the die plate 31 are already formed before being attached to the press die 10. More specifically, before the press machine is assembled, the stripper plate 26 and the die plate 31 are fixed to the mounting base of the processing machine (not shown) after being aligned with the overlapping bolts. After the stripper plate 26 and the die plate 31 are fixed with bolts, holes are formed by electric discharge machining. Accordingly, the stripper plate 26 is formed with a hole 25 and the die plate 31 is formed with a hole 36 of the same diameter facing the hole 25. The stripper plate 26 and the die plate 31 are removed from the mounting base of the processing machine. Thereafter, the stripper plate 26 is fixed to the upper mounting plate 16, and the die plate 31 is fixed to the lower mounting plate 30. Further, the upper surface of the die plate 31 includes a fourth flat surface portion K4 for holding the workpiece W.

Therefore, when the press mechanism descends and the tip 24c of the punch 24 protrudes from the lower surface of the stripper plate 26 that presses the die plate 31, the tip 24c of the punch 24 slides in the hole 36 of the die plate 31. It has become. When the press mechanism is at the lowest position, the tip 24c of the punch 24 is accommodated at a certain depth from the surface of the die plate 31. When the press mechanism is raised, the punch 24 is extracted from the hole 36 of the die plate 31 while the stripper plate 26 presses the workpiece W. As the press mechanism returns to the uppermost position, the stripper plate 26 moves away from the die plate 31.

  Next, the structure of each metal mold | die of this embodiment is demonstrated. FIG. 5 is a cross-sectional view of an essential part for explaining the configuration of each mold. Here, the X axis and the Y axis are set in the horizontal direction along the lower surface of the punch plate 17, the Z axis is set in the vertical direction along the axis of the fixing bolt 22 of the punch plate 17, and the origin is set to the press die 10. Set to the assembly reference position P0. It is assembled so that the axis C12 of the hole 25 of the stripper plate 26 and the axis C13 of the hole 36 of the die plate 31 are located at the first position P1 at the distance ΔW from the reference position P0.

  Moreover, the hole 25 and the hole 36 are simultaneously processed as described above, and an inner diameter φD11 is formed in which the inner diameter of the hole 25 and the inner diameter of the hole 36 are the same. The body portion 24a has a first diameter φD12, and the tip portion 24c has a second diameter φD13. The difference between the second diameter φD13 and the inner diameter φD11 of the hole 36 of the die plate 31 is set to a required clearance amount according to the thickness of the workpiece W. More specifically, the punch 24 is damaged or the die plate 31 is worn unless an appropriate clearance is provided in the second diameter φD13 with respect to the inner diameter φD11 of the hole 36 as in the conventional processing method. On the other hand, when the clearance of the second diameter φD13 with respect to the inner diameter φD11 of the hole 36 is set excessively, the workpiece W is bent, causing sagging or burrs. Therefore, in order not to cause the workpiece W to bend, it is desirable to add the inner diameter φD11 of the hole 36 to the second diameter φD13 multiplied by 20% or less of the thickness t of the workpiece W. . Further, in order not to cause damage to the punch 24 and wear of the die plate 31, the inner diameter φD11 of the hole 36 is obtained by multiplying the second diameter φD13 by a number greater than 0 to the thickness t of the workpiece W. It is desirable to add. In the present embodiment, the inner diameter φD11 of the hole 36 is set to the second diameter φD13 so that the machining accuracy of the punched hole formed in the workpiece W is secured with a more appropriate clearance. The thickness t is multiplied by 5% to 10%.

  The axial center C11 of the punch 24 is set at the first position P1 parallel to the XZ plane with respect to the axial center C12 of the hole 25 and the axial center C13 of the hole 36. At a position corresponding to the second position P2 that is separated from the reference position P0 by the distance ΔH1, there is a third flat surface portion K3 of the stripper plate 26 and a fourth flat surface portion K4 of the die plate 31. When the press mechanism is at the lowest position, the first flat surface portion K1 of the body portion 24a is a fourth position P4 that is spaced upward by the distance of the thickness t of the workpiece W placed at the second position P2. Is slightly above. At this time, the second flat surface portion K2 of the distal end portion 24c is on the third position P3 that is separated from the second position P2 by the distance ΔH2.

  Next, changes in processing accuracy between the press die configured as described above and a conventional press die will be described with reference to FIGS. Here, in both the conventional and the present embodiment, the axis C11 of the punch 24 and the axis C21 of the punch 51 are assembled at an angle θ with respect to the XZ plane at a position spaced apart from the reference position P0 by a distance ΔW. Assume that the workpiece W is punched out.

  FIG. 6 is a cross-sectional view of the main part showing the configuration of each mold. At a position corresponding to the second position P2 that is separated from the reference position P0 by the distance ΔH1, the second diameter φD13 of the distal end portion 24c causes the axial center C11 to be displaced by an angle θ on the Y axis with respect to the XZ plane. . At the position corresponding to the third position P3 that is separated from the second position P2 by the distance ΔH2, the second diameter φD13 of the tip end portion 24c is displaced from the XZ plane by the angle θ on the Y axis with respect to the XZ plane. Arise. In the fourth position P4, the axial center C11 of the first diameter φD12 of the trunk portion 24a is displaced by an angle θ on the Y axis with respect to the XZ plane.

  FIG. 7 is a main part projection view in which the cross section of the punch 24 corresponding to each position is projected onto the hole 25 and the hole 36. A region A11 shows projected portions on the Y axis of the inner diameter φD11 of the hole 25 from the reference position P0 to the second position P2 and the hole 36 from the second position P2 to the third position P3. A region A12 shows a projected portion of the first diameter φD12 of the trunk portion 24a extending in the Z-axis direction at a position corresponding to the reference position P0. A region A13 indicates a projected portion of the second diameter φD13 of the distal end portion 24c at a position corresponding to the fourth position P4. A region A14 indicates a projection portion of the second diameter φD13 of the distal end portion 24c at a position corresponding to the second position P2 that is separated from the reference position P0 by the distance ΔH1. A region A15 indicates a projection portion of the second diameter φD13 of the distal end portion 24c at a position corresponding to the third position P3 that is separated from the second position P2 by the distance ΔH2.

  The punching holes formed in the workpiece W are determined by the machining diameters formed at the fourth position P4 and the second position P2. Specifically, it is obtained from the processing diameter of the tip 24c with respect to the hole 36 at the fourth position P4 and the processing diameter of the tip 24c with respect to the hole 36 at the second position. That is, the range excluding the region A13 from the region A11 is the diameter of the punched hole.

  Next, when the drilling process is completed, the distal end portion 24c slides in the hole 36, and the second flat surface portion K2 of the distal end portion 24c is at the third position P3. When the tip 24c is at the third position P3, it is required not to interfere with the hole 36 in order to prevent the punch 24 from being damaged and the die plate 31 from being worn. As shown in FIG. 7, the region A <b> 15 indicating the tip 24 c is included in the region A <b> 11 indicating the hole 36, so that the punch 24 does not interfere with the hole 36.

  FIG. 8 is a cross-sectional view of a main part showing each conventional mold. At the position corresponding to the sixth position P6 that is spaced from the reference position P0 by the distance ΔH1, the outer diameter φD12 of the punch 51 causes the axial center C21 to be displaced by an angle θ on the Y axis with respect to the XZ plane. At the position corresponding to the seventh position P7 spaced from the sixth position P6 by the distance ΔH2, the outer diameter φD12 of the punch 51 causes the axial center C21 to be displaced by an angle θ on the Y axis with respect to the XZ plane. At the eighth position P8 where the thickness t of the workpiece W placed at the sixth position P6 is spaced upward, the axis C21 of the outer diameter φD12 of the punch 51 is Y-axis relative to the XZ plane. A misalignment of the angle θ occurs above.

  FIG. 9 is a main part projection view in which the cross section of the punch 51 corresponding to each position in the conventional processing method is projected onto the hole 53 and the hole 56. A region A21 shows a projected portion on the Y axis of the inner diameter φD11 of the hole 53 from the reference position P0 to the eighth position P8. A region A22 shows a projected portion of the outer diameter φD12 of the punch 51 extended in the Z-axis direction at a position corresponding to the reference position P0. A region 26 indicates a projected portion of the outer diameter φD12 of the punch 51 at a position corresponding to the eighth position P8. A region A27 shows a projected portion of the inner diameter φD14 of the hole 56 that is additionally machined to the hole 55 from the sixth position P6 to the seventh position P7. A region 23 indicates a projected portion of the outer diameter φD12 of the punch 51 at a position corresponding to the sixth position P6. A region 24 indicates a projected portion of the outer diameter φD12 of the punch 51 at a position corresponding to the seventh position P7.

The punching hole formed in the workpiece W by the conventional processing method is formed at the eighth position P8 that is a position corresponding to the fourth position P4 and the sixth position P6 that is a position corresponding to the second position P2. Determined by the processed diameter. Specifically, the punching hole is obtained from the processing diameter of the punch 51 with respect to the hole 53 at the eighth position P8 and the processing diameter of the punch 51 with respect to the hole 56 at the sixth position P6. That is, the range excluding the region A26 from the region A27 is the diameter of the punched hole. Further, in the conventional processing method, in addition to the diameter of the punched hole, a positional deviation in the Y-axis direction caused by the axial misalignment between the axial center C23 of the hole 56 of the die plate 54 and the axial center C22 of the hole 53 of the stripper plate 52. Is accumulated. Further, since the inner diameter φD14 of the hole 56 of the die plate 54 is different from the inner diameter φD11 of the hole 53 of the stripper plate 52, the workpiece W after drilling is sag.

  As described above, the diameter of the punched hole of the workpiece W in the conventional processing method is a range obtained by excluding the region A26 from the region A27, and the punched hole of the workpiece W by the punch 24 in the present embodiment is compared. It can be seen that the diameter is narrower than the area excluding the area A13 from the area A11.

Next, the press die action of the present embodiment configured as described above will be described.
When the press mechanism is located at the uppermost position, the workpiece W is placed on the die plate 31. Then, as the press mechanism is lowered, the upper mounting plate 16 is lowered, and the stripper plate 26 gradually presses the workpiece W. In conjunction with the lowering of the upper mounting plate 16, the punch plate 17 moves downward toward the stripper plate 26 while urging the compression spring 29. When the upper mounting plate 16 reaches a predetermined position, the punch 24 interlocked with the upper mounting plate 16 slides in the hole 25 toward the surface of the workpiece W by the pressing force of the press mechanism.

  10A to 10F are process diagrams for explaining the operation of each mold. When the press mechanism is lowered, as shown in FIG. 10A, the punch 24 slides and the second flat surface portion K <b> 2 of the tip end portion 24 c comes into contact with the workpiece W. Next, as illustrated in FIG. 10B, the second flat surface portion K <b> 2 formed at the distal end portion 24 c compresses the workpiece W. Further, the workpiece W is pressed by the fourth flat surface portion K4 of the die plate 31 and the second flat surface portion K2 of the punch 24. The workpiece W is sagged on the circumferential surface side of the distal end portion 24 c and the inside of the hole 36 of the die plate 31. As shown in FIG. 10C, when the second flat surface portion K2 of the tip portion 24c presses the workpiece W downward, the workpiece W is cracked. In the cross section of the crack, a fracture surface formed by tensile stress and a shear surface formed by the pressing force applied to the circumferential side surface of the tip portion 24 c and the inner side surface of the hole 36 are formed. Then, as shown in FIG. 10D, the crack formed on the tip 24c side and the crack formed on the die plate 31 side are connected, and the workpiece W is perforated by the second flat surface portion K2 of the tip 24c. Completing the construction process. Next, as shown in FIG. 10E, the body portion 24a slides through the hole 25, and the second flat surface portion K2 of the distal end portion 24c becomes the third position P3. And as shown in FIG.10 (f), when the press mechanism begins to raise, the punch 24 will raise. When the press mechanism is raised and the upper die set 11 reaches the uppermost position, the workpiece W having a punched hole is taken out.

According to the press die of this embodiment, the following effects can be obtained.
(1) In this embodiment, the die plate 31 and the stripper plate 26 are processed simultaneously, the hole 25 is formed in the stripper plate 26, and the hole 36 having the same diameter facing the hole 25 is formed in the die plate 31. A first diameter φD12 is formed on the first flat surface portion K1 of the punch 24, and a second diameter φD13 smaller than the first diameter φD12 is formed on the second flat surface portion K2. Therefore, at the time of drilling, the punch 24 can be prevented from interfering with the hole 36 no matter how the punch 24 slides in the hole 25 and the hole 36. Therefore, it is possible to form a punching hole with high processing accuracy in the workpiece W without causing damage to the punch 24 and wear of the die plate 31.

  (2) In this embodiment, the die plate 31 and the stripper plate 26 are processed simultaneously, the hole 25 is formed in the stripper plate 26, and the hole 36 having the same diameter facing the hole 25 is formed in the die plate 31. Therefore, there is no positional deviation between the axis C13 of the hole 36 of the die plate 31 and the axis C12 of the hole 25 of the stripper plate 26. Therefore, when the die plate 31 and the stripper plate 26 are fixed, there is no displacement between the axial center C13 of the hole 36 of the die plate 31 and the axial center C12 of the hole 25 of the stripper plate 26. Thus, a stable machining accuracy can be obtained in the drilling process performed on the workpiece W.

(3) In this embodiment, even if the press mechanism is at the lowest position, the body 24 a of the punch 24 does not slide in the hole 36 of the die plate 31 but slides in the hole 25 of the stripper plate 26. To do. Therefore, since the first diameter φD12 of the body portion 24a can be formed substantially the same as the inner diameter φD11 of the hole 25 and the hole 36, the axis that forms the XZ plane at the second position P2 that is separated from the reference position P0 by the distance ΔH1. The angle θ formed by C11 is suppressed. Therefore, the positional deviation on the Y axis below the punch 24 can be reduced.

  (4) In the present embodiment, the die plate 31 does not require additional processing for expanding the inner diameter of the hole 36. For this reason, it is not necessary to align the stripper plate 26 and the die plate 31 after the additional machining. Therefore, the axial center C12 of the hole 25 formed in the stripper plate 26 and the axial center of the hole 36 formed in the die plate 31. No misalignment occurs with C13. Further, since the additional work can be omitted, the manufacturing cost of the die plate 31 can be suppressed.

  (5) In this embodiment, when the hole 25 and the hole 36 are formed in the die plate 31 and the stripper plate 26, respectively, the die plate 31 and the stripper plate 26 are aligned with the mounting base of the processing machine. After superposition, they are fixed with bolts and electric discharge machining is performed. Therefore, no slip occurs between the die plate 31 and the stripper plate 26, so that the same inner diameter φD11 with higher accuracy can be formed in the hole 36 of the die plate 31 and the hole 25 of the stripper plate 26. .

In addition, you may change this embodiment as follows.
In the above embodiment, the second flat surface portion K2 is formed on the front end portion 24c of the punch 24 and the surface of the workpiece W is sheared. However, the surface formed on the front end portion 24c is not limited to a flat surface but is a slope. Alternatively, a curved surface may be formed.

  In the above embodiment, the punch 24 has a cylindrical shape, and the hole 25 of the stripper plate 26 and the hole 36 of the die plate 31 are formed in accordance with the punch 24. However, the shape of the punch 24, the shape of the stripper plate 26, and the die plate The shape of 31 is not necessarily limited to this. For example, it may be rectangular.

  In the above embodiment, the die plate 31 and the stripper plate 26 are simultaneously processed, the hole 25 is formed in the stripper plate 26, and the hole 36 having the same diameter opposite to the hole 25 is formed in the die plate 31. The method of forming the hole 25 formed in the stripper plate 26 and the hole 36 having the same diameter opposite to the hole 25 in the die plate 31 is not limited thereto, and holes having the same diameter may be formed separately.

The perspective view of the press die of this embodiment. Sectional drawing of the press die. The perspective view of each metal mold | die of the press die. The perspective view of the punch of this embodiment. The principal part sectional view showing the composition of each metallic mold of this embodiment. The principal part sectional drawing which shows the structure of the same each metal mold | die. The principal part projection figure which shows the structure of the same each metal mold | die. Sectional drawing of the principal part of each metal mold | die of the conventional press die. The principal part projection figure of each metal mold | die of the conventional press die. Process drawing explaining the effect | action of each metal mold | die of this embodiment. Sectional drawing of the principal part of each metal mold | die of the conventional press die. The principal part projection figure of each metal mold | die of the conventional press die.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Press type | mold, 24 ... Punch, 24b ... Base end part, 24c ... Tip part, 25, 36 ... Hole, 26 ... Stripper plate, 31 ... Die plate, (phi) D12 ... 1st diameter, (phi) D13 ... 2nd diameter, φD11: Diameter, W: Workpiece, t: Thickness.

Claims (4)

A press die for punching and machining a workpiece disposed between a stripper plate and a die plate by vertical movement of a punch accompanying vertical movement of a press mechanism,
While forming the opposing holes of the stripper plate and the die plate to have the same diameter,
The punch includes a body portion having a first diameter that is a diameter at which a base end portion side of the punch is guided by the hole of the stripper plate , and a second diameter that is smaller than the first diameter. A tip portion whose length in the direction is longer than the thickness of the workpiece,
When the press mechanism is at the lowest position, a joining surface between the body portion and the tip portion is disposed above the lower surface of the stripper plate. The press die according to claim 1, wherein the difference between the second diameter and the hole diameter of the die plate is a clearance amount required according to the thickness of the workpiece. The press die according to claim 2, wherein the clearance amount is greater than 0 and not more than 20% of the thickness of the workpiece. The press die according to claim 2, wherein the clearance amount is 5% or more and 10% or less of the thickness of the workpiece.

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