JP2016036827A - Press machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press machine capable of reducing maintenance cost.SOLUTION: A press machine comprises a punch installed in a punch holding member (a punch holder) and a die installed in a die holding member (a die holder), and executes press working while sandwiching a workpiece (a work) from both sides by the punch and the die. At least one of the punch or the die, or at least one of a divided punch 14 or a divided die 15a of dividing the punch or the die is formed in n-time symmetry, and has cutting edges A and A' in a plurality of places, and is constituted so as to be installable in the punch holding member or the die holding member in a part of the same attitude and a different cutting edge by rotating by a predetermined angle (360°/n) around the symmetric axis 17.SELECTED DRAWING: Figure 5

Description

  The present invention includes a punch attached to a punch holding member (punch holder) and a die attached to a die holding member (die holder), and sandwiches a workpiece (workpiece) from both sides by the punch and the die. The present invention relates to a press machine for press working, and more particularly to a machine that can extend the life of a die such as the punch or die.

  As a prior art which can extend the lifetime of the metal mold | die in a press machine, there exists a thing of Unexamined-Japanese-Patent No. 2004-1034 (patent document 1), etc. The one described in Patent Document 1 includes an upper die and a lower die, and the upper die and the lower die (die) in a press machine that performs press work such as punching, drawing and forging of a workpiece. (Raw material) (punch or die) is an alloy tool steel, and the hardened layer is coated on the surface of at least the part of the mold that contacts the workpiece, and the hardness of the alloy tool steel of the mold is A micro Vickers hardness of 500 or more and a hardness of the surface hardened layer or less are described. And it is described by using the structure of this patent document 1 that a metal mold | die with little abrasion and a long lifetime is obtained.

JP 2004-1034 A

  Although the life can be further improved by using the mold described in Patent Document 1, if the material to be processed in the sheet metal processing is a difficult-to-work material such as high-tensile material (high-tensile steel) or stainless steel, a sufficient life is obtained. It is difficult to get. When pressing such difficult-to-work materials as work materials, considering the life of the upper punch and lower die, it is generally not die steel (alloy tool steel) but more wear resistant. High-speed steel (high speed steel) is used.

  However, even when high-wear steel with high wear resistance is used for the mold (punch or die), the wear of the mold cannot be sufficiently suppressed. Need to be replaced. In particular, when the work material is difficult to process, the maintenance frequency of the mold is increased, and the maintenance cost increases due to the polishing of the mold and the replacement of the mold, thereby increasing the product cost. There was a problem.

  The objective of this invention is obtaining the press machine which can reduce a maintenance cost.

  In order to achieve the above object, the present invention comprises a punch attached to a punch holding member (punch holder) and a die attached to a die holding member (die holder). In a press machine that presses while sandwiching a workpiece) from both sides, at least one of the punch or the die is formed n times symmetrically, has cutting edges at a plurality of locations, and has a predetermined angle around the axis of symmetry ( 360 ° / n) by rotating, it is configured to be attachable to the punch holding member or the die holding member with the same posture and different cutting edge portions.

  Another feature of the present invention is a press machine comprising a punch attached to a punch holding member and a die attached to a die holding member, wherein the workpiece is pressed while sandwiching a workpiece from both sides by the punch and the die. The punch or the die is composed of a plurality of divided punches or divided dies, and at least one of the divided punches or the divided dies is formed n times symmetrically and is provided with cutting edges at a plurality of locations, and is symmetrical It is configured to be attachable to the punch holding member or the die holding member with the same posture and different cutting edge portions by rotating by a predetermined angle (360 ° / n) around the axis. To do.

  According to the present invention, an effect of obtaining a press machine capable of reducing maintenance costs can be obtained.

The figure explaining the example of the punching shape at the time of the press work in a press machine. It is a figure which shows the example of the structure of the metal mold | die part vicinity in a general press machine, (a) is the figure which shows the thing of the longitudinal cross-sectional view rotated 90 degrees left, (b) is B- of (a) figure. B line arrow figure, (c) is CC line arrow figure of (a) figure. It is a figure which shows an example of the division | segmentation punch or division | segmentation die shown in FIG. 2, (a) is a top view, (b) is a BB sectional view taken on the line in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the metal mold | die part vicinity in Example 1 of the press machine of this invention, (a) is the figure which shows the thing of the longitudinal cross-sectional view rotated 90 degrees left, (b) is a figure of (a) figure. The BB arrow directional view, (c) is the CC arrow directional view of (a) figure. It is a figure which shows an example of the division | segmentation punch 14a or division | segmentation die 15a shown in FIG. 4, (a) is a top view, (b) is a BB sectional view taken on the line in FIG. It is a figure which shows the other example of the division | segmentation punch 14a or the division | segmentation die 15a shown in FIG. 4, (a) is a top view, (b) is a BB sectional view taken on the line in FIG. It is a figure which shows the further another example of the division | segmentation punch 14a or the division | segmentation die 15a shown in FIG. 4, (a) is a top view, (b) is a BB sectional view taken on the line in FIG. It is a figure which shows an example of the division | segmentation die | dye 15b shown in FIG. 4, (a) is a top view, (b) is a side view. It is a figure which shows the other example of the division | segmentation die 15b shown in FIG. 4, (a) is a top view, (b) is a side view. 5A and 5B are views showing still another example of the divided die 15b shown in FIG. 4A, FIG. 5A being a plan view, and FIG. It is a figure which shows only the lower mold | type base 4 and the die holder 6 which are shown in FIG. 4, (a) is a top view, (b) is a BB sectional view taken on the line in FIG. FIG. 8 is a view showing still another example of the divided punch 14a or the divided die 15a shown in FIG. 4 and different from the examples shown in FIGS. 5 to 7, wherein (a) is a plan view and (b) is ( a) BB sectional view taken on the line in the figure. FIG. 11 is a view showing still another example of the split die 15b shown in FIG. 4 and an example different from those shown in FIGS. 8 to 10, wherein (a) is a plan view and (b) is a side view.

  Hereinafter, specific examples of the press machine of the present invention will be described with reference to the drawings. In each figure, the part which attached | subjected the same code | symbol has shown the part which is the same or it corresponds.

First, an example of a punching shape at the time of press processing in a press machine will be described with reference to FIG.
FIG. 1 shows an example in which a workpiece, which is a cut plate, is divided into scrap and product by a press machine. The outer line in the scrap is the outer shape 1 of the workpiece, and the inner line shows the punched shape 2.

When the product outer shape includes a vertical or parallel straight portion as in the product shown in FIG. 1, usually, the outer shape of the workpiece (material) is used as it is, and the straight portion of the product outer shape is not processed in many cases. .
However, when the material dimensions vary and lead to processing defects, the dimensions can be stabilized by punching the entire circumference including the straight portion of the product as shown in FIG.

The structure in the vicinity of the die portion in a general press machine that punches the entire circumference and processes the punched shape 2 from the workpiece will be described below with reference to FIGS. 2 and 3.
FIG. 2 is a diagram showing an example of a structure near a mold part in a general press machine, where (a) is a diagram showing the longitudinal cross-sectional view rotated 90 ° counterclockwise, and (b) is a diagram (a). The BB line arrow figure of a figure, (c) is CC line arrow figure of (a) figure.

  In FIG. 2, 3 is an upper mold base, 4 is a lower mold base, and 5 is a punch holder (punch holding member) for holding the punch 7, which is fixedly attached to the upper mold base 3. Reference numeral 6 denotes a die holder (die holding member) for holding the die 8, which is fixedly attached to the lower die base 4. 9 is a stripper provided in the punch holder 5 for removing a product obtained by press working from the punch holder 5. The stripper 9 is provided in each of a plurality of holes formed in the punch holder 5. It is configured to push and remove the processed product that is pressed by the spring 11.

  10a is a guide post fixed to the four corners of the lower mold base 4 and 10b is a guide post fixed to the four corners of the upper mold base 3 at a position corresponding to the guide post 10a. By inserting the formed hole into the pillar portion of the guide post 10a, the upper mold base 3 is configured to be moved up and down while being guided by the guide posts 10a and 10b. The upper mold base 3 is attached to a press machine so as to be movable up and down.

  The lower mold base 4 is fastened and fixed to a bolster plate (not shown) of a press machine. The bolster plate is a thick plate that is mounted on a bed of a press machine, and is provided with a groove or a tapped hole for fixing the lower mold base 4.

  A sheet metal (not shown in FIG. 2) that is a workpiece is set on a die 8 of a lower mold (see FIG. 2C) of the mold shown in FIG. 2, and then an upper mold ((b ) Is moved downward to press the punch 7 against the sheet metal, and cut and process the sheet metal together with the lower die 8 while sandwiching the sheet metal from both sides.

  The upper punch 7 and the lower die 8 may be integrally formed, but the ratio of the length to the cross-sectional area of the cross section obtained by cutting the punch 7 and the die 8 in the short direction is constant. When the value is larger than the value, the punch 7 and the die 8 are preferably divided and manufactured. This is because when the punch 7 or the die 8 is too long with respect to the cross-sectional area, dimensional change (size change) and distortion increase when quenching them.

For example, the punch 7 or the die 8 may be divided when the ratio of the length to the cross-sectional area satisfies the following condition.
Length / cross-sectional area ≧ 1/8
For example, when the cross-sectional area of the punch is 2500 mm ² and the length in the longitudinal direction is 500 mm, it is “length / cross-sectional area = 500/2500 = 1/5> 1/8”. .

  In the example shown in FIG. 2, the punch 7 is divided into a straight part of four sides and four corner parts, and the straight part is further divided into two. Similarly, the die 8 is divided into a straight portion of four sides and four corner portions, and the straight portion is further divided into two. Accordingly, the punch 7 is composed of eight divided punches 7a constituting a straight line portion and four divided punches 7b constituting a corner portion, and the die 8 also constitutes a corner portion with eight divided dies 8a constituting the straight line portion. It is composed of four divided dies 8b.

  3A and 3B are diagrams showing an example of the divided punch 7a or the divided die 8a shown in FIG. 2, in which FIG. 3A is a plan view, and FIG. 3B is a cross-sectional view taken along line BB in FIG. The structure of the divided punch 7a and the divided die 8a will be described with reference to FIG. In this example, the divided punch 7a and the divided die 8a are configured in the same shape so that they can be shared. Therefore, only the structure of the divided punch 7a and the divided die 8a will be described with reference to FIG. Further, the divided punch 7a and the divided die 8a may be collectively referred to as a mold.

  After the divided punch 7a and the divided die 8a are positioned with respect to the punch holder 5 and the die holder 6, they are fastened and fixed to the punch holder 5 and the die holder 6 with bolts or screws. For this reason, at least two positioning pin holes 12 are formed in the divided punch 7a and the divided die 8a, and positioning is performed by inserting knock pins into the positioning pin holes 12. Thereafter, a bolt or a screw is passed through the counterbore hole 13 formed in the divided punch 7a or the divided die 8a and fixed to the punch holder 5 or the die holder 6.

  Further, as shown in FIG. 3B, the divided punch 7a and the divided die 8a are usually formed with cutting edges in the longitudinal direction of the corners at only one place, and the other corners are Chamfered or rounded. In the case of the divided punch 7a and the divided die 8a configured as described above, when the cutting blade portion of the divided punch 8a or the divided die 8b is worn or damaged, the upper surface of the divided punch 7a or the divided die 8a (the cutting edge Part) must be polished and regenerated or replaced with a new one. For this reason, a maintenance expense becomes high and increases a product cost.

  Therefore, in Example 1 of the press machine of the present invention, in order to reduce maintenance costs, even if the mold (divided punch 7a or divided die 8a) is worn or damaged, the portion of the cutting edge is polished, The mold can be regenerated and used without changing the mold.

  Hereinafter, Example 1 of the press machine according to the present invention will be described with reference to FIGS. In these drawings, the portions denoted by the same reference numerals as those in FIGS. 1 to 3 described above indicate the same or corresponding portions.

FIG. 4 is a view showing the structure near the mold part in Example 1 of the press machine of the present invention. FIG. 4 (a) is a view showing the longitudinal cross-sectional view rotated 90 ° counterclockwise, and FIG. ) Is a view taken along line B-B in the figure, and (c) is a view taken along line CC in the figure (a).
The press machine according to the first embodiment shown in FIG. 4 is also substantially the same as that shown in FIG. 2 described above, and therefore, the description will be focused on the parts different from those shown in FIG.

  In FIG. 4, 14 is an upper punch and 15 is a lower die, which correspond to the punch 7 and die 8 shown in FIG. Also in this embodiment, the punch 14 is divided into four sides and four corners, and each of the straight portions is further divided into two, as described in FIG. . Similarly, the die 15 is divided into four sides and four corners, and each of the straight parts is further divided into two. Therefore, the punch 14 is composed of eight divided punches 14a constituting a straight portion and four divided punches 14b constituting a corner portion, and the die 15 is also composed of a corner portion and eight divided dies 15a constituting a straight portion. It consists of four divided dies 15b.

  2 differs from the press machine of FIG. 2 described above in that the divided punch 14a and the divided dies 15a and 15b are used as the punch holder (punch holding member) 5 or the die holder (die holding member) 6. On the other hand, a predetermined mounting posture can be selected from a plurality of mounting postures, and the divided punch 14a and the divided dies 15a and 15b are each formed n times symmetrically and have cutting edges at a plurality of positions. In other words, by rotating a predetermined angle (360 ° / n) around the axis of symmetry, the punch holder 5 or the die holder 6 can be attached in the same posture and different cutting edge portions. The n-fold symmetry is a figure that overlaps the original figure after 1 / n rotation.

  Further, in the first embodiment, the punch holder 5 and the die holder 6 each have a step having a wall surface perpendicular to the punch holder 5 or the die holder 6 in order to position the punch 14 or the die 15. Portions 5a and 6a are provided. That is, step portions (holding grooves) 5a and 6a which are wall surfaces perpendicular to the mounting planes (horizontal planes) 5b and 6b of the punch holder 5 and die holder 6 holding the punch 14 and die 15 are provided. . By pressing the punch 14 or the die 15 against the wall surface perpendicular to the stepped portions 5a and 6a, the punch 14 or the die 15 is positioned, and the punch holder 5 or the die holder 6 is bolted or screwed. Tightened and fixed.

  Next, referring to FIG. 5, a configuration is described in which the divided punch 14 a and the divided die 15 a can be selected from a plurality of mounting postures with respect to the punch holder 5 or the die holder 6. 5A and 5B are diagrams showing an example of the divided punch 14a or the divided die 15a shown in FIG. 4, in which FIG. 5A is a plan view, and FIG. 5B is a cross-sectional view taken along line BB in FIG.

  In the divided punch 14a or the divided die 15a shown in FIG. 5 (hereinafter, these may be collectively referred to as “die”), the vertical axis in the mounting posture to the punch holder 5 or the die holder 6 is a symmetry axis 17. These are configured in a shape that is symmetrical twice by rotating horizontally around the axis of symmetry (vertical axis) 17. That is, it has a two-fold symmetry with the center of the plan view of FIG. 5A as the symmetry axis 17 and can be attached to the punch holder 5 and the die holder 6 by selecting two attachment postures. It has become.

  More specifically, in FIG. 5, the mold (divided punch 14 a or divided die 15 a) is configured to have a two-fold symmetry with the center line of the center counterbore hole as the symmetry axis 17, and the symmetry axis When rotated 180 ° about 17, it becomes the same shape as the original figure. Moreover, as shown in FIG.5 (b), the metal mold | die is equipped with the two cutting edges of the cutting edge A and the cutting edge A 'at the both ends of the upper surface, respectively.

  Therefore, the die is set in a holder (punch holder 5 or die holder 6) and fixed with a bolt or the like so that the cutting edge A is used first, and press working is performed. When the press working is continued, the cutting edge A is worn or damaged. In this way, when the cutting edge A is worn, the cutting edge A ′ is removed by removing the mold from the holder, rotating it 180 degrees around the symmetry axis 17 and resetting it in the holder. It can be used to continue pressing.

  As described above, in this embodiment, even when one cutting edge A of the mold is worn, by rotating the mold and resetting it, the mold can be replaced with another new mold or worn. Since the press work can be continued without polishing the blade A, a press machine capable of greatly reducing the maintenance cost can be obtained.

The shape of the mold (divided punch 14a or divided die 15a) is not limited to that shown in FIG. 5, and it is sufficient that the mold is configured to be n times symmetrical. For example, the shape shown in FIGS. It is also good.
6A and 6B are views showing another example of the divided punch 14 or the divided die 15 shown in FIG. 4, wherein FIG. 6A is a plan view, FIG. 6B is a cross-sectional view taken along line B-B in FIG. These are figures which show the further another example of the division | segmentation punch 14 or the division | segmentation die 15 shown in FIG. 4, (a) is a top view, (b) is a BB sectional view taken on the line in FIG.

  In the example of FIG. 6, the mold (divided punch 14 a or divided die 15 a) has a horizontal axis in the mounting orientation to the punch holder or the die holder as a symmetric axis, and is rotated vertically around the symmetric axis (horizontal axis). Thus, it is configured in a shape that is symmetric twice. That is, it is configured in a shape that is two-fold symmetric with a center line in the short direction passing through the center in the longitudinal direction of the mold and passing through the center in the thickness direction as the symmetry axis 18, and the symmetry axis 18 is the center. When rotated 180 °, the front and back are reversed and have the same shape as the original figure. Moreover, as shown in FIG.6 (b), the metal mold | die is equipped with two cutting blades of the cutting edge A and the cutting edge B in the upper part (front side) and the lower part (back side) of the transversal direction one end side, respectively. Yes.

  Therefore, when the cutting edge A is used first, the mold is set and fixed on the holder and is pressed, and when the cutting edge A is worn or damaged, the mold is attached to the holder. If it is removed from the center and rotated 180 ° around the symmetry axis 18 so as to be turned upside down and reset in the holder, the cutting process can be continued using the cutting edge B.

  The example of FIG. 7 has two symmetrical axes, and each is configured to have a two-fold symmetry when rotated 180 ° around each symmetrical axis. That is, in the example of FIG. 7, similarly to FIG. 6, it is configured to be symmetrical twice with respect to the symmetry axis 18, and further, the center in the longitudinal direction passing through the center in the short direction of the mold and the center in the thickness direction. It is also configured to have two-fold symmetry with the line as the symmetry axis 19. As described above, in the example of FIG. 7, there are two symmetry axes 18 and 19, which are configured to be twice-symmetric with respect to each symmetry axis, so that four attachment postures can be selected. ing.

  Further, as shown in FIG. 7 (b), the mold is provided with two cutting edges of the cutting edge A and the cutting edge A 'on both ends of the upper surface thereof, and both ends of the back surface of the mold. In addition, each has two cutting edges, cutting edge B and cutting edge B ′, for a total of four cutting edges.

  Therefore, for example, when the cutting edge A is used first, the mold is set and fixed to the holder and fixed, and press working is performed. When the cutting edge A is worn or damaged, the mold is If it is removed from the holder, rotated 180 ° about the axis of symmetry 18 and turned upside down, and reset in the holder, the press working using the cutting edge B can be continued. Further, when the cutting edge B is also worn, it is set in the holder so that the front and back sides are reversed again and the cutting edge A ′ can be used by rotating 180 ° around the symmetry axis 19. And the press working can be continued using the cutting edge A ′. Further, when the cutting edge A ′ is also worn, when it is rotated 180 ° around the symmetry axis 18, it is set in the holder so that the cutting edge B ′ can be used with the reverse side again. can do.

  As described above, in the example of FIG. 7, the two symmetric axes 18 and 19 are used to first rotate 180 degrees around one symmetric axis 18 and then further rotate 180 degrees around the other symmetric axis 19. Depending on the combination, a total of four cutting edges A, B, A ', B' can be used in sequence, so that press working can be continued, and one mold can be used for a long period of time, further reducing the cost of maintenance. A press machine that can be reduced can be obtained.

  In the example of FIG. 7, the two symmetry axes 18 and 19 are used to form a shape that is two-fold symmetry with respect to each symmetry axis, but the symmetry axis 17 shown in FIG. 5 and the symmetry shown in FIG. 6. A combination of the shafts 18 or a combination of the symmetric axis 17 shown in FIG. 5 and the symmetric axis 19 shown in FIG. 7 can be similarly implemented, and the same effect as the example of FIG. 7 can be obtained.

  As described above, the divided punch 14a or the divided die 15a is formed n times symmetrically, has cutting edges at a plurality of locations, and has a predetermined angle (360 ° / n around the symmetry axes 17 to 19). ) By rotating, it can be attached to the punch holder 5 or the die holder 6 with the same posture and different cutting edge portions. Therefore, even if the cutting edge in use is worn or damaged, press work can be continued without changing to a new mold or polishing the worn cutting edge, greatly increasing maintenance costs. Can be reduced.

  In particular, when the punch 14 or the die 15 is used after being polished, the frequency of polishing can be reduced to less than half that of the prior art, so that the maintenance cost can be reduced to less than half and the production cost of the product can be reduced. Become.

  Further, in this embodiment, the divided punch 14a and the divided die 15a can be shared in the same shape, so that from this point as well, the mold manufacturing cost can be reduced and the mold cost can be reduced. .

  Next, referring to FIG. 8, a configuration will be described in which the divided die 15 b can be selected from a plurality of mounting postures with respect to the die holder 6. 8A and 8B are diagrams showing an example of the divided die 15b shown in FIG. 4, where FIG. 8A is a plan view and FIG. 8B is a side view.

  The split die 15b shown in FIG. 8 has a two-fold symmetry with the center of the plan view of FIG. 8A as the symmetry axis 20, and can be attached to the die holder 6 by selecting two attachment postures. It has become. That is, when it is rotated 180 ° about the axis of symmetry 20, it has the same shape as the original figure. Moreover, as shown in FIG.8 (b), the division | segmentation die | dye 15b is equipped with the two cutting edges of the cutting edge A and the cutting edge A 'at the both ends of the upper surface, respectively.

  Accordingly, first, the cutting die A is used, the divided die 15b is set on the die holder 6 and fixed with a bolt or the like, and press working is performed. If the cutting edge A is worn out or damaged, the split die 15b is removed from the die holder 6 and rotated 180 ° around the symmetry axis 20 to be reset in the die holder 6. The pressing can be continued using the cutting edge A ′.

  As described above, in this embodiment, the divided dies 15b provided at the four corners of the die 15 are rotated by rotating the mold even when one cutting edge A is worn, as in the case of the divided die 15a. By resetting, the press work can be continued without changing to another new split die or polishing the worn cutting edge A, so that the maintenance cost can be greatly reduced.

The shape of the split die 15b is not limited to that shown in FIG. 8 and may be the shape shown in FIGS. 9 and 10, for example, as long as the mold is configured to be n times symmetrical.
9 is a view showing another example of the divided die 15b shown in FIG. 4, in which (a) is a plan view, (b) is a side view, and FIG. 10 shows still another example of the divided die 15b shown in FIG. In the figure, (a) is a plan view and (b) is a side view.

  In the example of FIG. 9, the split die 15 b is 2 with respect to the symmetry axis 21 in the vertical direction of the drawing which is the center in the left-right direction in the plan view of FIG. It is configured in a shape that is rotationally symmetric, and when rotated 180 ° about the axis of symmetry 21, the front and back are reversed to the same shape as the original figure. Further, as shown in FIG. 9B, the split die 15b is provided with two cutting edges A and B on the front side and the back side on the upper end side in the drawing.

  Therefore, when the cutting edge A is used, the divided die 15b is set on the die holder 6 and pressed, and when the cutting edge A is worn or damaged, the divided die 15b is moved to the die holder. If it is removed from 6, rotated 180 ° around the axis of symmetry 21 and turned upside down and reset in the die holder 6, the press working can be continued using the cutting edge B.

  The example of FIG. 10 has two symmetrical axes and is configured to have a two-fold symmetric shape when rotated 180 degrees around the respective symmetric axes. That is, in the example of FIG. 10, similarly to FIG. 9, it is configured to be symmetrical twice with respect to the symmetry axis 21, and in the plan view of (a), the center in the vertical direction of the figure and the side view of (b). In FIG. 2, the shape is symmetrical with respect to the symmetry axis 22 in the left-right direction, which is also the center in the thickness direction. As described above, in the example of FIG. 10, there are two symmetry axes 21 and 22, and it is configured to be symmetric twice with respect to each symmetry axis, so that four attachment postures can be selected. ing.

  Further, as shown in FIG. 10 (b), the mold is provided with two cutting edges, that is, a cutting edge A and a cutting edge A 'on both ends of the upper surface thereof, and both ends of the back surface of the mold. In addition, each has two cutting edges, cutting edge B and cutting edge B ′, for a total of four cutting edges.

  Therefore, for example, when the cutting edge A is used first, the divided die 15b is set on the die holder 6 and press working is performed. When the cutting edge A is worn or damaged, the mold is If it is removed from the holder, rotated 180 ° about the axis of symmetry 21 and turned upside down and reset to the holder, the cutting process can be used to continue the press working. Further, when the cutting edge B is also worn, when it is rotated 180 ° around the symmetry axis 22, it is set in the holder so that the reverse side is reversed and the cutting edge A 'can be used again. And the press working can be continued using the cutting edge A ′. Further, if the cutting edge A ′ is also worn out, the die holder 6 can be used so that when the edge is turned 180 ° around the axis of symmetry 21, the front and back sides are reversed again and the cutting edge B ′ can be used. Can be set.

  As described above, in the example of FIG. 10, the two symmetry axes 21 and 22 are used to first rotate 180 degrees around one symmetry axis 21 and further rotate 180 degrees around the other symmetry axis 22. Depending on the combination, a total of four cutting edges A, B, A ', B' can be used in sequence, so that press working can be continued, and one mold can be used for a long period of time, further reducing the cost of maintenance. Can be reduced.

  In the example of FIG. 10, the two symmetry axes 21 and 22 are used to form a shape that is twice-symmetric with respect to each symmetry axis. However, the symmetry axis 20 shown in FIG. 8 and the symmetry shown in FIG. 9 are used. A combination of the shafts 21 or a combination of the symmetric axis 20 shown in FIG. 5 and the symmetric axis 22 shown in FIG. 10 can be implemented in the same manner, and the same effect as in the example of FIG. 10 can be obtained.

  As described above, the divided punch 15b is formed n times symmetrically, has cutting edges at a plurality of positions, and is rotated at a predetermined angle (360 ° / n) about the symmetry axes 20 to 22, thereby having the same posture. And it is comprised so that attachment to the said die holder 6 is possible in the part of a different cutting edge. Therefore, even if the cutting edge in use is worn or damaged, the press work can be continued without changing to another new mold or polishing the worn cutting edge, and the maintenance cost can be greatly reduced.

  Note that the divided punch 14b shown in FIG. 4 can also be configured in the same manner as the divided die 15b by providing n-fold symmetry and providing a plurality of cutting edges, similarly to the divided die 15b described above.

  Next, a structure for positioning the divided dies 15a and 15b on the die holder 6 will be described with reference to FIG. 11A and 11B are views showing only the lower mold base 4 and the die holder 6 shown in FIG. 4, wherein FIG. 11A is a plan view and FIG. 11B is a cross-sectional view taken along line BB in FIG.

  As described with reference to FIG. 3, the division die is generally positioned on the die holder by positioning pins at least at two places. On the other hand, in this embodiment, as shown in FIG. 11, the die holder (die holding member) 6 attached to the lower die base 4 is provided with the divided dies 15a and 15b for positioning at predetermined positions. A step portion (holding groove) 6a is provided. That is, the step portion 6a has a wall surface perpendicular to the mounting plane 6b of the die holder 6 to which the divided dies 15a and 15b are attached, and the divided die 15a is formed on the wall surface perpendicular to the step portion 6a. , 15b is pressed to position the divided dies 15a, 15b relative to the die holder 6. Thus, after the divided dies 15a and 15b are positioned with respect to the die holder 6, they are fastened and fixed to the die holder 6 with bolts or the like.

  According to the present embodiment, since the divided die can be positioned without using a knock pin when the divided die is assembled, the position of the part can be determined, and the divided die can be easily assembled. Can do.

  The punch holder (punch holding member) 5 is configured in the same manner as the die holder 6. That is, as shown in FIG. 4, a step portion 5a having a wall surface perpendicular to the mounting plane 5b of the punch holder 5 to which the divided punches 14a and 14b are attached is provided, and the step portion 5a is perpendicular to the step portion 5a. By pressing the divided punches 14a and 14b against the wall surface, the divided punches 14a and 14b can be positioned and fixed to the punch holder 5 without using knock pins.

  Further, the punch 14 and the die 15 are not limited to being divided, and even when the punch 14 and the die 15 are configured as an integrated product without being divided, the integrated punch 14 and the die 15 are used as the integrated product. Positioning by the step portions 5a and 6a is possible in the same manner.

  Next, another example of the above-described split die 15a and split die 15b will be described with reference to FIGS. FIG. 12 is a diagram showing still another example of the divided punch 14a or the divided die 15a shown in FIG. 4, and shows another example different from those shown in FIGS. 5 to 7, wherein (a) is a plan view, (b) ) Is a cross-sectional view taken along line BB in FIG. 4A, FIG. 13 is still another example of the split die 15b shown in FIG. 4, and is a diagram showing an example different from that shown in FIGS. (A) is a plan view and (b) is a side view.

  In FIG. 12, the part of the cutting edge in the mold such as the divided punch 14a or the divided die 15a is constituted by separate pieces 23 and 23 '. The separate pieces 23 and 23 'are attached to the mold with screws 24 or the like. In this way, even if the cutting blade portion is configured as a separate piece and screwed to the mold, a configuration in which a plurality of mounting postures can be selected is the same as that shown in FIGS. it can. Also, as shown in FIG. 12, the size of the parts that require wear resistance can be minimized by separating the cutting blade portion into separate pieces, which also reduces the mold cost. Can be reduced.

  The replacement from the cutting edge A to the cutting edge A ′ can be performed in the same manner as in FIG. The replacement from the cutting edge A to the cutting edge C or the replacement from the cutting edge A ′ to the cutting edge C ′ may be performed by turning the separate pieces 23 and 23 ′ upside down and attaching them to the mold.

  In FIG. 13, the cutting edge portion of the split die 15 b is configured with another piece 25, and this separate piece 25 is also attached to the mold with a screw 24 or the like. Even if the cutting edge portion of the split die 15b is configured as a separate piece, a configuration in which a plurality of mounting postures can be selected can be achieved, as in the case shown in FIGS.

  Since what is shown in FIG. 13 is configured to screw another piece 25 including the cutting edge A and the cutting edge C only to the front surface of the split die 15b, the replacement from the cutting edge A to the cutting edge C is performed as described above. This is done by turning the other piece 25 upside down and attaching it to the split die 15b. As shown in FIG. 9 above, in the case of two-fold symmetry with respect to the symmetry axis 21, by attaching another piece to the back surface of the split die 15b, the same as the example shown in FIG. Can be used.

  Further, the shape of the divided die 15b is the same as that shown in FIG. 8, and one or more pieces are attached so as to have a plurality of cutting edges as shown in FIG. 8 and FIG. It is also possible to configure it so as to be symmetrical twice with respect to the axes 20 to 22.

  As shown in FIG. 13, by dividing the cutting blade portion into separate pieces for the split die 15b, the size of the parts that require wear resistance can be minimized. Mold cost can also be reduced.

  As described above, according to the present embodiment, the punch or die is configured so that a predetermined mounting posture can be selected from a plurality of mounting postures with respect to the punch holder or the die holder. Because it is configured with a cutting edge, even if the cutting edge in use is worn or damaged, it is possible to continue pressing without changing to another new punch or die or polishing the worn cutting edge. And maintenance costs can be greatly reduced.

  In particular, when the punch 14 and the die 15 are used after being polished, the frequency of polishing can be reduced to less than half that of the prior art, so that the maintenance cost can be reduced to less than half and the manufacturing cost of the product can be reduced. .

  Since the punch 14 and the die 15 are pressed against the step portions 5a and 6a of the punch holder 5 and the die holder 6, the punch 14 and the die 15 are positioned on the punch holder 5 and the die holder 6 without using a knock pin. It is possible to simplify the assembly work.

In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, in the above embodiment, the press machine that presses the product as shown in FIG. 1 has been described. However, by changing the mold, the press machine can be similarly applied to products that press products of various shapes. is there. Further, the split punch and the split die have been described as having a shape that is two-fold symmetric, but the present invention can be similarly implemented even with a configuration that is n-fold symmetric three times or more. Further, the punch and die are not necessarily limited to those used in a divided manner, and can be similarly applied to those in which the punch and die are configured as one integrated product.
Further, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

DESCRIPTION OF SYMBOLS 1 ... Material external shape, 2 ... Material extraction shape, 3 ... Upper mold | type base, 4 ... Lower mold | type base,
5 ... Punch holder (punch holding member), 6 ... Die holder (die holding member),
7, 14 ... punch, 7a, 7b, 14a, 14b ... split punch,
8, 15 ... die, 8a, 8b, 15a, 15b ... split die,
9 ... stripper, 10a, 10b ... guide post, 11 ... spring,
12 ... Positioning pin hole, 13 ... Counterbore hole,
17-22 ... axis of symmetry,
23, 23'25 ... another piece, 24 ... screw.

Claims (10)

In a press machine comprising a punch attached to a punch holding member and a die attached to a die holding member, and press working while sandwiching a workpiece from both sides by the punch and the die,
At least one of the punch or the die is formed n times symmetrically, has cutting edges at a plurality of positions, and rotates at a predetermined angle (360 ° / n) around the axis of symmetry, thereby having the same posture and different A press machine that is configured to be attachable to the punch holding member or the die holding member at a cutting edge portion. In a press machine comprising a punch attached to a punch holding member and a die attached to a die holding member, and press working while sandwiching a workpiece from both sides by the punch and the die,
The punch or die is composed of a plurality of divided punches or divided dies,
At least one of the divided punches or the divided dies is formed n times symmetrically, has cutting edges at a plurality of locations, and is the same by rotating a predetermined angle (360 ° / n) about the axis of symmetry. A press machine that is configured to be attachable to the punch holding member or the die holding member at a posture and different cutting edge portions.   3. The press machine according to claim 1, wherein the punch holding member is supported on the upper die base on the upper side, the die holding member is supported on the lower die base on the lower side, and the lower die base is fastened and fixed to the bolster plate. The press machine is characterized in that the upper mold base is configured to move up and down while being guided by a guide post fixed to the lower mold base and a guide post fixed to the upper mold base.   3. The press machine according to claim 1, wherein at least one of the punch holding member and the die holding member has the punch holding member or the die holding member to hold the punch or die. A step portion having a wall surface perpendicular to the step portion, and pressing the punch or die against the wall surface perpendicular to the step portion, the punch or die is positioned and the holding member for punch or the A press machine that is fixed to a holding member for a die.   3. The press machine according to claim 1, wherein the punch or the die is configured to be symmetrical twice so that the same shape is obtained by rotating 180 degrees around one symmetry axis. 4. .   6. The press machine according to claim 5, wherein the axis of symmetry is a vertical axis of the punch or die attached to the punch holding member or the die holding member, and the axis of symmetry (vertical axis) is the center. A press machine characterized by having a shape that becomes two-fold symmetric when rotated horizontally.   6. The press machine according to claim 5, wherein the symmetry axis is a horizontal axis in a mounting posture of the punch or die to the punch holding member or the die holding member, and the symmetry axis (horizontal axis) is the center. A press machine characterized by having a shape that becomes two-fold symmetric when rotated vertically.   The press machine according to claim 5, wherein the symmetry axis includes two symmetry axes of a vertical axis and a horizontal axis in a mounting posture of the punch or die to the punch holding member or the die holding member, By rotating horizontally around the vertical axis, it becomes symmetric twice, and also when rotated vertically around the horizontal axis, it becomes symmetric twice, and the punch holding member or A press machine configured to be attachable to a holding member for a die.   8. The press machine according to claim 7, wherein the symmetry axes are a horizontal axis in a short direction and a horizontal axis in a longitudinal direction in an attachment posture of the punch or die to the punch holding member or the die holding member. A press machine characterized in that each of the two horizontal axes is vertically rotated around the two horizontal axes so as to have a shape that is symmetrical twice.   The press machine according to claim 2, wherein at least a part of the divided punch and at least a part of the divided die are formed in the same shape, and the divided punch and the divided die are used as common parts. machine.

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