JP2000301259A - Punching die of square hole for press forming - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with punching holes having various sizes by one die by making the sizes of the square holes adjustable. SOLUTION: In this die, after combining slidably four die blocks 1 to 4 having cutting edges 1a to 4a on one side of the die block respectively so that the cutting edges 1a to 4a intersect one another in a hollow heraldic design, they are movably housed in a die holder 5 having a hollow square cylinder shaped frame body 6. While the die block 1 is fixed, by moving the die blocks 2 to 4 in the arrow direction shown in the figure within a horizontal plane, a square hole 14 is formed in the center of the die block. In that state, the die blocks 2 to 4 are pressed and fixed by set screws 12, 13, 15 and 16. Since the dimensions 14 of the square hole can be freely set by the moving magnitude of the die blocks 2 to 4, it can cope with even the dimensions of the various square holes of a trial piece and multi-item production in small quantities by using one die.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die for punching a square hole from a sheet material by press working, and more particularly to a lower die (die) therefor.

[0002]

2. Description of the Related Art FIG. 7 is a longitudinal sectional view showing a conventional die, and FIG.
FIG. 2 is a perspective view of a die piece constituting the cutting edge. 7 and 8, the die includes a die piece 20 and a die holder 21. The die piece 20 is inserted into a concave portion on the upper surface of the die holder 21, and is fixed to the die holder 21 by a fixing screw 22 screwed from the side. As shown in FIG. 8, the rectangular die piece 20 has a square hole 23 at the center thereof.
Cutting edges 20a are formed at the edges of the four sides.

As is well known, a die (not shown) is fixed on a press bed, and a punch (not shown) is driven toward a square hole 23, so that a square hole of the same size as the punch is formed from a plate (not shown) set on the die upper surface. Is punched out. The swarf is discharged from the pit 24. In the above-mentioned conventional die, the die pieces 20 are prepared according to the size of the square hole 23 and are exchanged according to the size of the square hole. Also, the cutting edge 20
If a is worn or damaged, the upper surfaces thereof are polished integrally with the die piece 20 mounted on the die holder 21.

[0004]

As described above, the die piece 20 is exchanged according to the size of the square hole 23. For example, a hole up to a size of 10 mm square (10 mm × 10 mm) is 0.01 mm. When the vertical and horizontal dimensions are changed in units, there are hundreds of thousands of combinations. Therefore, when a conventional die is used for a prototype or various small-quantity products, it is necessary to manufacture a large number of die pieces 20 each time the size of the punched hole changes, which makes it difficult to respond to a short delivery time and burdens mold costs. Was big. Moreover, the cutting edge 20a is worn out.
If the die piece is damaged, a step occurs between the die piece 20 and the upper surface of the die holder when only the die piece 20 is polished. Therefore, the die piece 20 and the die holder 21 must be polished integrally, and this polishing operation requires a lot of time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a single type of die capable of coping with various hole sizes, and to reduce the number of repairs in the event of wear or damage.

[0006]

SUMMARY OF THE INVENTION According to the present invention, four die blocks are slidably combined with each other to form a square hole for press working whose dimensions can be changed. The above problem is solved by installing an adjustable block having a variable height so that only the die block can be polished.

That is, first, the present invention provides a hollow die by combining four rectangular parallelepiped die blocks each having a cutting edge formed at an upper edge of one side so that the cutting edges intersect in a tom-like shape. It is housed in a die holder consisting of a prismatic frame and a flat base fixed to the bottom thereof, and the die block is moved along the base so that an arbitrary size is formed inside the cutting edge for press working. A square hole is formed, and this die block is pressed and fixed from the side with the die holder (claim 1).

For fixing the die block, a set screw screwed into the side wall of the frame can be used (claim 2), and a block gauge inserted between the side wall of the frame and the die block. Can be used (claim 2).

One of the die blocks is fixed to the die holder, the other is moved only in one direction (X direction), and the other is moved in a direction orthogonal to the X direction (Y direction). If only the die block is moved and the remaining die block is moved in both the X and Y directions, the die block can be easily moved and the fixation is firm.

On the other hand, if a height adjustment block comprising two upper and lower slide bases that perform a wedge action and an adjustment screw for moving one of the slide bases forward and backward is provided below the die block, Even if a step is formed between the die block and the die holder, the upper surface position of the die block can be corrected by the height adjustment block, so that the die block can be independently polished and repaired.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, FIG. 1 is a plan view of a die showing a frame of a die holder in a horizontal section, and FIG.
FIG. 3 is a sectional view taken along the line II-II, and FIG. 3 is a perspective view showing one of the die blocks. In FIGS. 1 and 2, the die is configured such that four die blocks 1 to 4 are housed in a die holder 5. The die holder 5 includes a hollow rectangular cylindrical frame 6 and a flat base 7 fixed to the bottom of the frame 6 by, for example, screws. On the other hand, the die blocks 1 to 4
As shown in FIG. 1, cutting edges 1a to 4a are respectively formed at the upper edge portions of one side. Although the planar shapes of the die blocks 1 to 4 are different from each other as shown in FIG. 1, the height dimensions are the same as can be seen from FIG.

As shown in FIG. 1, four die blocks 1
4 to 4 are slidably combined with each other so that the cutting edges 1a to 4a cross each other like a tom, and are incorporated in the frame 6 of the die holder 5. As shown in FIG. 2, a height adjustment block 11 including two upper and lower slide bases 8 and 9 and an adjustment screw 10 for moving one of the slide bases 8 (the lower slide base 8 in the illustrated example) forward and backward is provided. Block 1
4 are installed below. When the slide base 8 and the slide base 9 come into contact with each other via an inclined surface, and the slide base 9 is moved right and left in FIG.
The slide base 8 moves slightly up and down. The adjusting screw 10 is screwed with the side wall of the frame 6, and the tip is rotatably connected to the slide base 9. The upper surfaces of the die blocks 1 to 4 are flush with the upper surface of the frame 6 due to the height adjustment of the height adjustment block 11. The base 7 and the slide bases 8 and 9 are provided with pits 7a to 7
9a are open.

Here, the planar relationship between the die blocks 1 to 4 and the frame 6 in the combined state is as shown in FIG. That is, in FIG.
4 in a state where they are closely attached to each other on the crosshair as shown in the figure,
The die blocks 1 and 4 each have two outer side surfaces in contact with the inner wall surface of the frame 6, and the die blocks 2 and 3 have one outer side surface in contact with the inner wall surface of the frame body 6, and the other side surface also has The side surface that has a space between the inner wall surface of the frame 6 and the inner wall surface of the frame 6
And 3 are orthogonal to each other.

In such a relationship, if two directions (X, Y) perpendicular to each other and parallel to the inner wall surface of the frame body 6 are determined as shown in the figure, an XY plane along the base 7 (FIG. 2) is obtained. , The die block 1 cannot move, the die block 2 can move only in the X direction, the die block 3 can move in both the X and Y directions, and the die block 4 can move only in the Y direction. In addition, the die block 1 is fixed to the base 7 by a screw, for example, as a fixed block.

Then, from the state shown in FIG. 4, as shown in FIG. 5A, the push screws 12 screwed into the side walls of the frame 6 are turned to push the die blocks 3 and 4 in the Y direction by y. ,
Next, as shown in FIG. 5 (B), when the die screws 2 and 3 are pushed in the X direction by x by turning the push screw 13 as well, the dimensions x × y are provided inside the cutting edges 1a to 4a as shown in the drawing. Is formed. The square hole 14 can be set to any size within, for example, a 10 mm square depending on the magnitude of the movement amounts x and y. After the square hole dimensions are set, as shown in FIG. 5 (C), the die blocks 2 and 3 are pushed with the pushing screws 13 and 14 with the pushing screws 15 and 16 screwed into the side wall of the frame 6.
Side, and fixed in the illustrated state.

FIG. 6 is a plan view of a die showing another embodiment. In FIG. 6, instead of the setscrews 12 and 13 in FIG. 5C, block gauges 17 and 1 are provided between the die blocks 3 and 4 and the side wall of the frame 6, respectively.
8 is inserted. Although the block gauges 17 and 18 are generally known as length measuring instruments, they are inserted as shown in the figure to form square holes 14 having an accurate size corresponding to the thickness dimension. be able to. The die blocks 2 and 3 are pressed and fixed to block gauges 17 and 18 by push screws 15 and 16, respectively. The pressing and fixing of the die blocks 2 to 4 with the die holder 5 can be performed by other means such as a cam and a turnbuckle, in addition to the above-described set screw and block gauge.

1 and 2, cutting edges 1a to 4a
If the screw is worn or damaged, push screws 12, 13,
The fixing screws of the die blocks 15 and 16 and the die block 1 (not shown) are loosened, the die blocks 1 to 4 are taken out of the die holder 5, and the upper surfaces thereof are polished. Then, the die blocks 1 to 4 are set again in the state shown in FIGS. 1 and 2, and at this time, the die blocks 1 to 4 are lifted up by the adjustment of the height adjusting block 11 by an amount corresponding to the reduced height of the die blocks. And the upper surface of the frame body 6 are flush.

According to the illustrated embodiment, the die block 2
Since the square hole 14 of an arbitrary size can be formed by the moving amount of ~ 4, it is not necessary to arrange the production of the die piece every time the size of the square hole is changed as in the conventional case. Is also unnecessary. In that case, the set screw 1
By setting the positions of the die blocks 3 and 4 using the block gauges 2 and 13 or the block gauges 17 and 18 and pressing and fixing the die blocks 2 and 4 using the set screws 15 and 16, Can be set accurately in units of 0.01 mm. Further, by installing the height adjustment block 11, the die blocks 1 to 4 can be taken out from the die holder 5 and polished, so that compared to a conventional die that requires simultaneous polishing of the die piece and the die holder, Repair man-hours for the cutting edges 1a to 4a are reduced.

In the illustrated embodiment, the die block 1 is fixed to the die holder 5, the die block 2 is moved only in one direction (X direction), and the die block 4 is moved in a direction orthogonal to the X direction (Y direction). And the die block 3 is moved in both X and Y directions.
The die blocks 2 and 3 that move only in one direction are guided by the inner wall surface of the frame 6 during the movement, and for example, have a square hole size as compared with the case where all the die blocks 1 to 4 are movable in both the X and Y directions. Is set accurately, and the inner wall surface of the frame 6 is used as a pressing support surface when the die blocks 2 and 4 are pressed and fixed, so that the number of pressing screws and the like as fixing means is minimized, and the fixing is performed. Becomes stronger.

In the illustrated embodiment, the die holder 5
Although the frame 6 and the base 7 are separate bodies, they may be integrally formed, and the outer peripheral surface of the frame 6 may be, for example, a columnar shape. Also,
An appropriate step can be freely provided as long as the inner wall surface of the frame 6 does not prevent the movement of the die blocks 2 to 4. Further, if the die blocks 1 to 4 are polished integrally with the die holder 5, the height adjustment block 11 is omitted and the die block 1 is polished.
4 may be directly supported on the base 7. Furthermore, in the embodiment, the example in which the size of the square hole can be adjusted within 10 mm square has been described, but it is needless to say that the size is not limited to this.

[0021]

As described above, according to the present invention, the dimensions of the square hole can be arbitrarily set with the same die by forming the die by incorporating the four die blocks into the die holder. Also, it is possible to cope with a variety of small holes such as prototypes and small lots without having to arrange a die piece every time, with a short delivery time and at low cost. Also, at this time, the height position of the die block can be corrected by installing the height adjustment block, so that the die block with worn or damaged cutting edges can be removed from the die holder and polished. Thus, the man-hour for repairing the die is greatly reduced as compared with the case where the die holder is simultaneously polished.

[Brief description of the drawings]

FIG. 1 is a plan view of a die showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a perspective view showing one of the die blocks in FIG.

FIG. 4 is a main part plan view showing a planar relationship between a die block and a die holder in the die of FIG. 1;

FIGS. 5A and 5B are plan views of a main part showing a procedure of adjusting a square hole dimension of the die in FIG. 1, wherein FIG. 5A is a state in which the die block is moved in the Y direction, and FIG. 5B is a state in which the die block is moved in the X direction. ,
(C) is a state where the die block is pressed and fixed.

FIG. 6 is a plan view of a die showing another embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a die showing a conventional example.

FIG. 8 is a perspective view showing a die piece in FIG. 6;

[Explanation of symbols]

 Reference Signs List 1 die block 2 die block 3 die block 4 die block 5 die holder 6 frame 7 base 8 slide base 9 slide base 10 adjustment screw 11 height adjustment block 12 push screw 13 push screw 14 square hole 15 push screw 16 push screw 17 block Gauge 18 Block gauge

Claims (5)

[Claims] 1. A hollow prismatic frame body comprising four rectangular parallelepiped die blocks each having a cutting edge formed at an upper edge of one side so as to be slidable with each other so that the cutting edges intersect in a tom-like shape. The die block is housed in a die holder consisting of a flat base fixed to the bottom thereof, and the die block is moved along the base to form a square hole for press working of an arbitrary size inside the cutting edge. And a die for press working, wherein these die blocks are pressed and fixed from the side with the die holder. 2. The die according to claim 1, wherein said die block is fixed by a push screw screwed into a side wall of said frame. 3. The die according to claim 1, wherein said die block is fixed by a block gauge inserted between a side wall of said frame and said die block. 4. One of the die blocks is fixed to the die holder, the other one is moved only in one direction (X direction), and the other is moved in a direction orthogonal to the X direction (Y direction). The die for punching according to any one of claims 1 to 3, wherein the die block is moved only in the direction X) and the remaining die block is moved in both directions X and Y. 5. A height adjusting block comprising two upper and lower slide bases for wedge action and an adjusting screw for moving one of the slide bases forward and backward is provided below the die block. The square punching die for press working according to any one of claims 1 to 4.