CN113369353B - Method for assembling stamping die and stamping die - Google Patents

Abstract

The invention provides an assembling method of a stamping die capable of precisely aligning a punch and a die and the stamping die suitable for the assembling method. The method assembles a stamping die (1) comprising: preparing at least one punch (24) including a front end portion formed with a punch cutting edge, and at least one die block (34) formed with a die cutting edge corresponding to the punch cutting edge; the height of the punch (24) is adjusted in such a manner that the front end of the punch (24) protrudes from the punch guide (26); a die cutting blade of a die block (34) is fitted to a tip portion of a punch (24) whose position is regulated by a punch guide (26), and the die block (34) is positioned with respect to the punch (24); and abutting the die pad plate (31) against the die block (34) from the side opposite to the punch (24), and fixing the die block (34) to the die pad plate (31).

Description

Method for assembling stamping die and stamping die

Technical Field

The present invention relates to a method for assembling a press mold and a press mold suitable for the method.

Background

In order to obtain a clean cut surface in the press working, the clearance between the punch and the die must be appropriately set. The appropriate value of the gap is, for example, about 4% of the plate thickness of the material, and the smaller the material is, the smaller the appropriate value is. As the gap decreases, alignment of the punch with the die (edge matching) becomes difficult.

The mold is formed in a plurality on the mold plate or in each of a plurality of mold blocks whose positions are restricted by the mold plate. In a conventional method for assembling a press die, a punch guide for regulating the position of a punch is precisely machined to align the position of the punch with a plurality of dies arranged on a die plate (for example, refer to patent document 1).

[ Prior Art literature ]

[ patent literature ]

[ patent document 1] Japanese patent laid-open No. 7-60377

Disclosure of Invention

[ problem to be solved by the invention ]

However, there is a physical limit to the machining accuracy of the machine tool for manufacturing the press die. If the appropriate value of the clearance is equal to or less than the range of the error of the machine tool, it is difficult to align the punch with the die in the conventional assembly method. In order to process an extremely thin foil using a stamping die, an assembly method different from the previous idea is required. Accordingly, an object of the present invention is to provide a method of assembling a press die capable of precisely aligning a punch with a die, and a press die suitable for the method of assembling.

[ means of solving the problems ]

The method for assembling a press mold according to an embodiment of the present invention is a method for assembling a press mold, including: preparing at least one punch including a front end portion formed with a punch cutting edge, and at least one die block formed with a die cutting edge corresponding to the punch cutting edge; adjusting the height of the punch in such a manner that the front end of the punch protrudes from the punch guide; the die cutting edge of the die block is embedded into the front end part of the punch, the position of which is limited by the punch guide, and the die block is positioned relative to the punch; and abutting the die pad plate against the die block from the side opposite to the punch, and fixing the die block to the die pad plate.

According to this aspect, the punch cutting edge of the punch and the die cutting edge (hereinafter, sometimes referred to as a die) corresponding to the punch cutting edge can be directly aligned, and after confirming that the positions of the punch cutting edge and the die cutting edge are not shifted, the die block with the die formed can be fixed to the die pad. There is no need to align the die on the die plate with the punch via the punch guide. Therefore, even if the clearance between the punch and the die is extremely small, the punch and the die can be aligned.

In this aspect, the punch guide, the die block, and the die pad are preferably assembled in a state in which the bottom surface and the top surface are inverted from each other compared to the case of progressive press working.

According to this aspect, the position of the die can be adjusted while visually checking the tip portion of the punch protruding from the punch guide, and therefore, the punch and the die can be easily aligned.

In this aspect, it is preferable that one module corresponds to one punch.

According to this aspect, the module can be arranged at an optimal position for each punch. Further, one module may be configured to correspond to a small number of punches (for example, two punches). The position of the die can be finely adjusted compared with the conventional structure in which one die plate corresponds to a plurality of punches.

In this aspect, the die pad plate is formed with a plurality of through holes larger than the nominal diameter of the bolts, and the die block is preferably fastened by inserting the bolts into the through holes.

According to this aspect, since a gap is provided between the shaft portion of the bolt and the through hole, the bolt can be freely moved within the range of the gap to adjust the position of the module. The dies can be matched in the position of the punch.

The stamping die of an embodiment of the invention comprises: a plurality of punches each having a punch cutting edge formed therein; a punch guide limiting the position of the punch; a die pad formed in a flat plate shape including a first surface facing the punch side and a second surface opposite to the first surface, and having a plurality of through holes penetrating the first surface and the second surface; and a plurality of modules arranged on the first surface, and die cutting edges corresponding to the punch cutting edges are formed on each module; and is constructed in such a manner that one module corresponds to one punch, each module is fixed to the die pad by bolts inserted through each through hole, the through holes of the die pad correspond to each module to be divided into a plurality of groups, each group including at least two through holes.

The press die of another embodiment of the present invention includes: a plurality of punches each having a punch cutting edge formed therein; a punch guide limiting the position of the punch; a die pad plate formed in a flat plate shape including a first surface facing the punch side and a second surface opposite to the first surface; and a plurality of modules arranged on the first surface, and die cutting edges corresponding to the punch cutting edges are formed on each module; and is configured in such a manner that one module corresponds to one punch, at least two through holes are formed in each module, and the at least two through holes are fixed to the die pad by bolts inserted into the through holes.

According to these aspects, the punch having the punch cutting edge and the die block having the die can be aligned one to one, and therefore the punch and the die can be aligned without being affected by the machining precision of the machine tool.

In this embodiment, the through-hole is formed to be larger than the nominal diameter of the bolt, and a first space may be defined between the through-hole and the bolt, or a second space larger than the first space may be defined in the radial direction of the bolt between each die and the adjacent member adjacent to the die.

Even if there is no abutting member for positioning around the die block as in the above-described configuration, the punch and the die can be aligned by applying the method of assembling the press die of the above-described configuration.

In the above-described aspect, the module includes a high portion and a low portion having a smaller protruding height from the first surface than the high portion, and the screw head of the bolt may be disposed at the low portion.

According to this aspect, when the bolt is inserted from the first surface side of the die pad, the protruding height of the screw head of the bolt can be suppressed only in accordance with the level difference between the high portion and the low portion of the die block.

[ Effect of the invention ]

According to the present invention, it is possible to provide a method of assembling a die capable of precisely aligning a punch with a die, and a press die suitable for the method of assembling.

Drawings

Fig. 1 is a cross-sectional view showing an example of a press mold used in the assembly method according to each embodiment of the present invention.

Fig. 2 is a plan view showing the positional relationship between the die block and the die pad shown in fig. 1.

Fig. 3 is a diagram illustrating an assembling method according to the first embodiment of the present invention, and is a perspective view of a process of reversing an upper die to protrude a tip end portion of a punch from a punch guide.

Fig. 4 is a perspective view showing a procedure of fitting the die block to the tip portion of the punch.

Fig. 5 is a perspective view showing a process of the die block in a state where the die pad is brought into contact with the punch limit position.

Fig. 6 is a perspective view showing a procedure of inserting a bolt into a through hole of a die pad plate.

Fig. 7 is a perspective view showing a procedure of fixing the module to the die pad.

Fig. 8 is a perspective view showing a procedure of lifting up the die pad plate to remove the die block from the punch.

Fig. 9 is a perspective view showing a modification of the routine shown in fig. 7.

Fig. 10 is a cross-sectional view illustrating a press die according to a second embodiment of the present invention.

Fig. 11 is a cross-sectional view showing a modification of the lower portion shown in fig. 10.

[ description of symbols ]

1: stamping die

2: punch handle

3: die holder

4: outer guide rail

10: material

20: upper die

21: punch backing plate

22: punch plate

23: stripper plate

24: punch head

25: guide pin

26: punch guide

27: spring

29: distance block

30: lower die

31: die pad

32: template

34: module

35: through hole

36: bolt

37: nut

341: die cutting edge

342: screw hole

343: high portion

344: low part

Detailed Description

Preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar structures. The existing assembly method uses a precision machined punch guide 23 to match the position of the punch 24 to the die. Therefore, it may be difficult to align the punch 24 with the die in a gap smaller than the machining precision of the machine tool.

One of the features of the assembly method according to an embodiment of the present invention is that: the die block 34 having the die formed therein is prepared corresponding to each punch 24, and the position of the die block 34 is fixed with reference to the position of the punch 24 in a state where the position is regulated by the punch guide 26. If a plurality of dies are formed in one die plate 32, each die cannot be moved freely, but if a die is formed for each of the plurality of divided die blocks 34, each die can be moved individually. The present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a cross-sectional view showing an example of a press mold (progressive type) 1 used in the assembling method according to each embodiment of the present invention. The press die 1 may be configured as a die for single shot press working. In the illustrated example, the press die 1 is configured as a die with a die set, and main plates (a punch pad 21, a punch plate 22, a stripper plate 23, a die pad plate 31, and the like) are fixed to the inner sides of upper and lower die set plates (punch holders 2, die holders 3) positioned by guide posts (outer guide rails 4).

In the following description, various plates and components thereof fixed to the punch holder 2 are collectively referred to as an upper die 20, and various plates and components thereof fixed to the die holder 3 are collectively referred to as a lower die 30. The structure of the press mold 1 is not limited to the illustrated example, and a known structure can be appropriately selected. A band-shaped material 10 subjected to press working is continuously fed between the upper die 20 and the lower die 30. The thickness 10 of the material is, for example, 100 μm or less. In the illustrated example, the plate thickness 10 is 25. Mu.m. The clearance between the punch 24 and the die is, for example, 3 μm or less.

The upper die 20 includes a punch backing plate 21, a punch plate 22, a stripper plate 23, and the like. The punch plate 22 is fixed with various punches 24 for punching, bending, drawing, and the like, guide pins 25 for positioning a press-worked material, and the like. A punch cutting edge is formed at the tip end of the punch 24 to be subjected to press working. The punch backing plate 21 receives the load of the punch 24 and suppresses the deformation of the punch handle 2.

The stripper plate 23 biases the springs 27 toward the lower die 30. A punch guide 26 is fixed to the stripper plate 23. The stripper plate 23 and the punch guide 26 may be formed as an integral structure. The punch guide 26 guides the punch 24 to press the strip-shaped material 10 to be pressed into the die block 34.

The lower die 30 includes a die pad 31, a die block 34, and the like. The die pad 31 is formed in a flat plate shape including a first surface 31A facing the upper die 20 and a second surface 31B opposite to the first surface 31A. A plurality of modules 34 are fixed to the first surface 31A facing the punch 24. From any module 34, an adjacent module 34 is an example of an adjacent member.

The die block 34 is formed of cemented carbide or the like in a block shape such as a rectangular parallelepiped or a cylinder, and is arranged on the die pad 31. A die cutting edge corresponding to the punch cutting edge of the punch 24 is formed in each of the die blocks 34. The die pad 31 receives the load of the die block 34 to suppress deformation of the die holder 3. In the illustrated example, the lower die 30 further includes a die plate 32 fixed to the die pad 31. The form 32 is not a necessary structure and may be omitted. The template 32 encloses the module 34. From any of the modules 34, the form 32 is another example of an abutment member.

Fig. 2 is a plan view showing the positional relationship between the die block 34 and the die pad 31 shown in fig. 1. In the illustrated example, a lower die 30 of a type that does not include a die plate 32 is disclosed. In addition, in the illustrated example, four modules 34 are used in one step of progressive press working. The shape and arrangement of the modules 34 are not limited to the illustrated example, and may be appropriately selected according to the shape of the material to be punched.

At least one die cutting edge 341 is formed in each module 34. A plurality of screw holes or through holes for bolts 36 described later are formed around the die cutting blade 341. In the illustrated example, a pair of screw holes 342, 342 are formed in the module 34 on opposite sides of the clamping die cutting edge 341.

As shown in fig. 2, in the case where the screw hole 342 is formed in the die block 34 and the through hole 35 is formed in the die pad 31, the through hole 35 is formed at a position overlapping the screw hole 342 in the thickness direction of the die pad 31. As shown in fig. 10 and 11 described later, when the through-holes 35 are formed in the die block 34 and the screw holes are formed in the die pad 31, the through-holes 35 of the die block 34 are formed at positions overlapping the screw holes of the die pad 31 in the thickness direction of the die pad 31.

First embodiment

An assembling method and a modification thereof according to a first embodiment of the present invention will be described with reference to fig. 3 to 9. Fig. 3 to 9 are drawn with attention paid to one of the punches 24 shown in fig. 1 and the module 34 corresponding to the punch 24, and are schematically shown for explanation, and are drawn in a shape different from the actual press die 1.

Fig. 3 is a perspective view showing a procedure of projecting the tip end portion of the punch 24 from the punch guide 26. In the illustrated example, the upper die 20 is inverted between the bottom surface and the top surface as compared with the case of progressive press working, but the bottom surface and the top surface are not necessarily inverted. In the example shown, the springs 27 are removed and distance blocks 29 are inserted between the punch backing plate 21 and the punch plate 22. The distance block 29 is formed so that the tip end portion of the punch 24 protrudes from the punch guide 26 by a height of about 1mm to 2 mm.

When the spring 27 is attached to the stripper plate 23, the stripper plate 23 floats up by the urging force of the spring 27, and the tip end portion of the punch 24 may not protrude from the punch guide 26. Instead of removing the spring 27 and inserting the distance block 29, the stripper plate 23 may be pressed down against the urging force of the spring 27, the tip end portion of the punch 24 may be protruded from the punch guide 26, and the punch may be fixed by a bolt or the like in order to maintain the height thereof.

Fig. 4 is a perspective view showing a procedure of fitting the die block 34 to the tip end portion of the punch 24. As shown in fig. 4, the die block 34 is fitted to the tip end portion of the punch 24 in a state where the position is regulated by the punch guide 26. Since the bottom surface and the top surface of the upper die 20 are reversed, the clearance between the punch 24 and the die can be adjusted while visually checking the clearance.

Fig. 5 is a perspective view showing a procedure of the die block 34 in a state where the die pad 31 is brought into contact with the tip end portion of the punch 24 from the side opposite to the punch 24, and the position is restricted. The die pad 31 included in the lower die 30 and the punch guide 23 included in the upper die 20 are fixed in relative positions by guide posts or the like disposed at four corners of the die set. The die pad 31 has a plurality of through holes 35 formed therethrough, which extend through the first surface 31A and the second surface 31B.

Fig. 6 is a perspective view showing a procedure of inserting the bolts 36 into the through holes 35 of the die pad plate 31. In the illustrated example, the bolts 36 are inserted from the second surface 31B side of the die pad plate 31. The through holes 35 of the die pad 31 are divided into groups corresponding to the respective modules 34. The same group of through holes 35 overlap the same module 34 in the thickness direction of the die pad plate 31. At least two through holes 35 are included in one group in such a way that the module 34 does not rotate.

Fig. 7 is a perspective view showing a procedure of fixing the module 34 to the die pad 31. Each through hole 35 is formed to be larger than a nominal diameter of the bolt 36 (a diameter of a thread ridge of the shaft portion) inserted in this through hole 35 and smaller than a screw head of the bolt 36. In the following description, a gap between the inner peripheral surface of the through hole 35 and the shaft portion of the bolt 36 is referred to as a first space S1.

Even if the position of the female screw formed in the die block 34 fitted with the punch 24 is slightly shifted from the center of the through hole 35, the position can be adjusted within the range of the first space S1, and the bolt 36 can be screwed to the die block 34 as shown in fig. 7. Between any of the modules 34 and the adjacent member (e.g., the adjacent module 34), a second space S2 larger than the first space S1 is partitioned in the radial direction of the bolt 36.

Fig. 8 is a perspective view showing a procedure of lifting up the die pad 31 and removing the die block 34 from the punch 24. The process shown in fig. 3 to 8 is repeated only in accordance with the number of punches 24 and the number of modules 34 corresponding to the punches 24, and the respective modules corresponding to all the punches 24 are aligned.

According to the assembly method of the first embodiment and the press die 1 suitable for the method, the die blocks 34 having the dies formed corresponding to the respective punches 24 are prepared, and the respective dies can be individually moved, so that the punches 24 and the dies can be precisely aligned. The influence caused by the error contained in the relative positions of the punches 24 and dies does not exist. Since the punch 24 and the die are assembled while edge matching is performed one by one, the edge matching of the press die 1 is completed at the time point when the assembly of the press die 1 is completed. There is no need to apply fine adjustment to the punch or die to perform edge matching after assembly as in the conventional assembly method. The adjustment time of the gap can be shortened.

The modules 34 of the first embodiment do not need to be in contact with the abutment members since they are each independently aligned. As described above, between the module 34 and the adjacent member, the second space S2 larger than the first space S1 is partitioned. According to the first embodiment, the side surfaces of the module 34 do not need to be polished and smoothed, so that the manufacturing cost of the press die 1 can be reduced. In the conventional structure in which the molding blocks having the molds are brought into contact with the pits of the mold plate 32, it is necessary to polish and smooth the side surfaces of the respective molding blocks.

Fig. 9 is a perspective view showing a modification of the routine shown in fig. 7. As shown in fig. 9, a bolt 36 may be inserted from the first surface 31A side of the die pad plate 31. In the illustrated example, the screw head of the bolt 36 is formed in a hexagonal shape, the screw head of the bolt 36 is fixed to a countersunk hole formed in the die block 34, and the nut 37 is screwed from the second surface 31B side of the die pad 31.

Next, an assembling method and a modification of the second embodiment of the present invention will be described with reference to fig. 10 and 11. The structures having the same or similar functions as those of the first embodiment are described with reference to the first embodiment with the same reference numerals, and the description thereof is omitted here. Other structures are the same as those of the first embodiment.

Second embodiment

Fig. 10 is a cross-sectional view illustrating a press die 1 according to a second embodiment of the present invention. As shown in fig. 10, the second embodiment is different from the first embodiment in that a through hole 35 is formed in a die block 34, not in a die pad plate 31. Each through hole 35 is formed to be larger than a nominal diameter of a bolt 36 fixing the module 34 and smaller than the head.

In the illustrated example, the bolts 36 are inserted from the first surface 31A side of the die pad plate 31. In the illustrated example, the step is formed in the die 34, and includes a high portion 343 protruding from the first surface 31A of the die pad 31, and a low portion 344 having a protruding height smaller than the high portion 343. The screw head of the bolt 36 is disposed at the lower portion 344. Fig. 11 is a cross-sectional view showing a modification of the low portion 344 shown in fig. 10. In the illustrated example, the lower portion 344 is configured as a counterbore. The head of the bolt 36 is received in this counterbore.

According to the second embodiment and the modification thereof, the dies are divided into the plurality of modules 34 corresponding to the respective punches 24 as in the first embodiment, and therefore the punches 24 and the dies can be precisely aligned. At this time, even if the female screw formed in the die pad plate 31 is slightly offset from the center of the through hole 35 of the die block 34, the bolt 36 can be screwed by adjusting the position within the range of the clearance between the through hole 35 and the shaft portion of the bolt 36. In the case where the step is formed in the block 34, the protruding height of the screw head of the bolt 36 can be suppressed in accordance with the step of the high portion 343 and the low portion 344.

The embodiments described above are for the purpose of facilitating understanding of the present invention, and are not intended to limit the present invention. The arrangement, material, condition, shape, size, and the like of the elements included in the embodiments are not limited to examples, and can be appropriately changed. In addition, the structures shown in the different embodiments can be substituted for one another or combined.

Claims (10)

1. An assembling method of a press mold, which assembles the press mold for press working, includes:

preparing at least one punch including a front end portion formed with a punch cutting edge, and at least one die block formed with a die cutting edge corresponding to the punch cutting edge;

adjusting the height of the punch in such a manner that the front end portion of the punch protrudes from a punch guide;

positioning the die cutting edge of the die block relative to the punch by fitting the die cutting edge of the die block to the front end portion of the punch limited in position by the punch guide; and

and a die pad plate is abutted against the die block from the opposite side of the punch, and the die block is fixed to the die pad plate while maintaining the fitted state of the punch and the die block.

2. The assembling method of a press mold according to claim 1, wherein

The punch, the punch guide, the die block, and the die pad plate are assembled in a state in which the bottom surface and the top surface are inverted from each other as compared with the use of progressive press working.

3. The assembling method of the press mold according to claim 1 or 2, wherein

One of the modules is configured to correspond to one of the punches.

4. The assembling method of the press mold according to claim 1 or 2, wherein

Forming a plurality of through holes larger than the nominal diameter of the bolt on the die pad plate, and

the module is secured to the die pad plate including inserting the bolt through the through hole for fastening.

5. A stamping die, comprising:

a plurality of punches each having a punch cutting edge formed therein;

a punch guide limiting the position of the punch;

a die pad formed in a flat plate shape including a first surface facing the punch side and a second surface opposite to the first surface, and having a plurality of through holes penetrating the first surface and the second surface; and

a plurality of modules arranged on the first surface, and die cutting edges corresponding to the punch cutting edges are formed on the respective modules; and is also provided with

In such a way that one of said modules corresponds to one of said punches,

while maintaining the fitted state of the punch and the die blocks, each of the die blocks is fixed to the die pad plate by bolts inserted through the respective through holes,

the through holes of the die pad plate are divided into a plurality of groups corresponding to the respective modules, and each group includes at least two through holes.

6. The stamping die of claim 5, wherein

The through hole is formed to be larger than a nominal diameter of the bolt, and a first space is partitioned between the through hole and the bolt; and is also provided with

A second space larger than the first space is partitioned in a radial direction of the bolt between each of the modules and an abutting member abutting the module.

7. The stamping die of claim 5, wherein

The module includes a lower portion, and an upper portion having a greater protruding height from the first face than the lower portion; and is also provided with

The screw head of the bolt is disposed at the lower portion.

8. A stamping die, comprising:

a plurality of punches each having a punch cutting edge formed therein;

a punch guide limiting the position of the punch;

a die pad formed in a flat plate shape including a first surface facing the punch side and a second surface opposite to the first surface; and

a plurality of modules arranged on the first surface and each having a die cutting edge corresponding to the punch cutting edge; and is also provided with

In such a way that one of said modules corresponds to one of said punches,

at least two through holes are formed in each of the modules, and the punch and the modules are fixed to the die pad plate by bolts inserted through the through holes while maintaining the fitted state of the punch and the modules.

9. The stamping die of claim 8, wherein

The through hole is formed to be larger than a nominal diameter of the bolt, and a first space is partitioned between the through hole and the bolt; and is also provided with

A second space larger than the first space is partitioned in a radial direction of the bolt between each of the modules and an abutting member abutting the module.

10. The stamping die of claim 8, wherein

The module includes a lower portion, and an upper portion having a greater protruding height from the first face than the lower portion; and is also provided with

The screw head of the bolt is disposed at the lower portion.

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