JPH0513616U - Panchiritena - Google Patents

Abstract

(57) [Abstract] [Purpose] The punch can be easily aligned with the die hole, the position can be adjusted, and the fixing can be performed easily. Especially, the suitability of the alignment can be easily judged from outside during the punch stroke. It is to provide a practical punch retainer having a function that can be implemented. [Structure] A block-shaped main body having a punch insertion hole for removably mounting a punch and a bolt hole for fixing to a top die, wherein the block-shaped main body is an elastic body and a block-shaped body urged by the elastic body. It is provided with a centering determination jig consisting of a plurality of plunger pins protruding from the upper surface of the main body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a punch retainer.

[0002]

[Prior art and its technical problem]

 BACKGROUND ART In a die for press punching, a punch is attached to a punch retainer, and the punch retainer is fixed to an upper die (die shoe or base) with a bolt. In that case, the punch retainer must be fixed to the upper die so that the punch and the axial center of the die bush of the lower die are accurately aligned. The upper mold bolt holes and positioning pin holes can be made highly accurate by adopting NC machine tools, etc. However, it is unavoidable that some errors occur due to various factors. Positioning adjustment of the punch retainer is essential. As this method, Japanese Patent Publication No. 54-40798 discloses that a punch retainer is placed on a die bush, the punch and the die hole are pre-aligned, and an adhesive is applied to the upper surface of the punch retainer to form an upper die. A method has been proposed in which the punch retainer is temporarily fixed with an adhesive by descending and crimping, then the upper die is raised, the punch retainer is tightened with a bolt, and a knock pin is driven. However, this method requires troublesome adhesive application work, and it has to wait until sufficient adhesive force is generated, resulting in poor workability. In particular, a large number of punches are mounted on one upper die. If there is a problem. In addition, since the Pile Retainer is bonded, after fixing the punch retainer by tightening bolts and driving knock pins, it is difficult to correct the punch position when the upper die is lowered and the alignment is slightly misaligned. was there.

The present invention was devised to solve the above-mentioned problems, and the purpose thereof is to easily perform centering, position adjustment and fixing of a punch and a die hole. In particular, the object is to provide a practical punch retainer having a function capable of easily determining whether or not the centering is appropriate during the punch stroke from the outside. In order to achieve the above-mentioned object, the present invention is provided with a punch insertion hole for removably mounting a punch in a block-shaped body and a bolt hole for fixing to the upper die, wherein And a jig for centering, which is composed of a plurality of plunger pins and which is biased by this and protrudes from the upper surface of the block-shaped main body.

[0004]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show an embodiment in which the present invention is applied to a punch retainer for a punch with a collar. A block-shaped body 1 has a punch insertion hole 10 in the height direction, and at least two bolt holes 11 with seats 11 at positions different from the punch insertion hole 10. In this embodiment, the punch insertion hole 10 has a seat hole 100 on the upper surface side. A punch 2 is inserted into the punch insertion hole 10 and is held in the seat hole 100 by the upper collar 20. If necessary, a hole for a center knock pin is formed in the punch 2, or as shown in the figure, a backing plug 2a is superposed on the upper surface of the collar, and a pin hole 200 is formed in the backing plug 2a. Is positioned, and a knock pin is fitted in a pin hole provided in the upper mold in advance to perform positioning. Numerals 4 and 4 are bolts inserted into the above-mentioned bolt holes 11 with seats, and the block-shaped main body 1 is fixed by being screwed into the screw holes for preliminarily providing the upper die.

Although the above-described structure is similar to that of the conventional punch retainer, the present invention provides the block-shaped main body 1 with the centering jig 5. This centering jig is composed of a plurality of thin plunger pins 6 arranged at two or more locations (preferably three or more locations) of the block-shaped body 1, and these are arranged so as to always project upward from the block-shaped body 1. It is composed of a coil spring 7 for urging, the coil spring 7 is built in the block-shaped body 1, and the plunger pins 6 have the same protruding length. In this embodiment, two vertical holes 12 and 12 are provided near the punch insertion hole 10 and the seated bolt holes 11 and 11, respectively, and these vertical holes 12 and 12 are the upper surface of each block-shaped main body 1. It has a step 120 close to it, and a thin pin hole 121 extends from the center of the step. The plunger pin 6 is fitted in the thin pin hole 121, and has a piston 60 in the lower part which is slidably fitted in the vertical hole 12. A plug 8 is screwed into the lower end of the hole 12, and a coil spring 7 having a relatively weak spring constant is arranged between the plug 8 and the piston 60. FIG. 3 shows another embodiment of the jig 5, in which a plunger pin 6 and a coil spring 7 are assembled in a tubular casing 9 and the tubular casing 9 is screwed into a vertical hole 12 with an internal thread. Is.

The coil springs 7 may all have the same spring constant or may have different spring constants. Further, urethane rubber or the like can be used instead of the coil spring. Also, FIGS. 1 and 2 are merely examples of the present invention, and can be applied to various types and structures of punch retilers. That is, a retainer for a deformed punch with a flange that has a pin hole that penetrates a knock pin with a thread, a rotation stop pin insertion groove that intersects the punch insertion hole, and a ball lock punch that has a hole that diagonally communicates with the punch insertion hole. It can be applied to all types of punch retainers, such as retainers, collective retainers that can be equipped with multiple punches, screw retainers, and punch retainers that have no flanges and hold the punch by the tapered surface of the shank.

[0007]

[Operation of the embodiment]

 Next, the method and operation of using the punch retainer according to the present invention will be described. The upper die 3 has female screw holes 31, 31 and pin holes 30 machined by an NC machine tool or the like. A button die 14 is attached to the lower mold 13. In this state, when the punch is clamped and fixed to the upper die 3 via the punch retainer, the punch 2 is held in the punch insertion hole 10 of the block-shaped body 1 as shown in FIG. Next, the bolts 4 and 4 are inserted into the seated bolt holes 11 and 11 of the block-shaped body 1, and the bolts 4 and 4 are lightly screwed into the female screw holes 31 and 31 of the upper die 3. The screwing amount must be such that the block-shaped body 1 can be suspended and the tips of the plunger pins 6, 6 abut the lower surface of the upper mold 3. The plunger pins 6 and 6 have the same length and are biased by the coil springs 7 and 7. Therefore, the heads 40 of the bolts 4 and 4 come into contact with the seat 110 of the seated bolt holes 11 and 11 with a predetermined set load, and the posture of the block-shaped body 1 is corrected by the plunger pins 6 and 6. , And the bottom surface of the upper die 3 is spaced from the bottom surface of the upper die 3 with equilibrium.

Next, the press is operated to gently lower the upper mold 3. Then, the block-shaped main body 1 descends while being hung by the bolts 4 and 4 with the punch 2 attached, and the blade edge 21 of the punch 2 is inserted into the die hole 140 of the button die 14. . At this time, if the axes of the punch 2 and the die hole 140 are aligned with each other, the punch 2 does not touch the die hole 140, so the punch 2 continues to descend smoothly and the lifting force does not work. That is, the distance h between the block-shaped main body 1 and the upper mold 3 remains as in FIG. Therefore, the suitability of the centering can be confirmed and judged very easily. When the cores are aligned as described above, the upper mold 3 may be raised, and then the bolts 4 and 4 may be rotated and tightened. The plunger pins 6 and 6 resist the spring force of the coil spring 7. It is pushed until it is flush with the block-shaped body 1 and thereafter prevents the bolts 4, 4 from loosening as a tensioning element.

On the other hand, when the punch 2 and the die hole 140 are not aligned with each other at the time of lowering, the punch 2 comes into contact with the wall of the die hole 140, so that the punch 2 has a lowering resistance, which causes blockage. It is transmitted to the main body 1. Therefore, as shown in FIG. 5, the plunger pins 6, 6 are pressed by the upper mold 3 and pushed into the block-shaped body 1 against the biasing force of the coil springs 7, 7. As a result, the block-shaped body 1 approaches the upper mold 3. Therefore, whether or not the axes of the punch 2 and the die hole 140 are aligned can be instantly judged or confirmed from the outside. Then, when the punch 2 and the die hole 140 are not aligned with each other as described above, the upper die 3 is temporarily raised. Since the seated bolt holes 11 and 11 are holes without screws and there is a clearance between them and the outer diameter of the bolts 4 and 4, the block-shaped main body 1 is displaced within the clearance, or the blocks 4 and 4 are centered on the block. The main body 1 is moved in a vertical plane to adjust the position, and the upper mold 3 is lowered again. If the distance h between the block-shaped main body 1 and the upper die 3 remains in the state shown in FIG. 4 during this stroke, it means that the punch 2 and the die hole 140 are aligned in the axial center. Just tighten the bolts 4 and 4 as they are. Therefore, the punch retainer can be easily fixed to the upper die in an accurate centering state.

From the above, when the present invention is applied, the center knock pin of the punch 2 can be omitted. However, when the center knock method is applied, the backing can be performed during or after centering. The lower part of the knock pin 201 may be fitted in the pin hole 200 of the plug 2a, and the upper part of the knock pin 201 may be fitted in the pin hole 30 of the upper die.

[0011]

[Effect of the device]

 According to the present invention described above, since the block-shaped main body is provided with the elastic body and the centering jig which is urged by the elastic body and projects from the upper surface of the block-shaped main body, Alignment and adjustment work can be performed easily and quickly without using adhesive, etc. In particular, the suitability of alignment can be reliably judged from the outside during the punch stroke, and the structure is simple. Excellent effects such as

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a punch retainer according to the present invention.

FIG. 2 is a partially cutaway side view showing an embodiment of a punch retainer according to the present invention.

FIG. 3 is a partial sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing a usage state of the present invention.

FIG. 5 is a cross-sectional view showing a state of the punch retainer when the centers are not aligned.

[Explanation of symbols]

 1 Block-shaped body 2 Punch 3 Upper die 4 Bolt 6 Plunger pin 7 Elastic body 10 Punch insertion hole 11 Bolt hole with seat

Claims (1)

[Scope of utility model registration request] 1. A block-shaped main body having a punch insertion hole for removably mounting a punch and a bolt hole for fixing the punch to an upper die, wherein the block-shaped main body is urged by an elastic body. A punch retainer comprising a centering jig composed of a plurality of plunger pins protruding from the upper surface of a block-shaped body.