JP2571219Y2 - Punch Retainer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch retainer.

[0002]

2. Description of the Related Art In a die for press punching, a punch is inserted into a punch retainer, and the punch retainer is fixed to an upper die (die shoe or base) with bolts. . In that case, it is necessary to fix the punch retainer to the upper die so that the punch and the axis of the lower die bush are exactly aligned. The use of NC machine tools and the like makes it possible to significantly increase the accuracy of the upper bolt holes and positioning pin holes.
It is unavoidable that some errors occur due to various factors,
Therefore, the positioning adjustment of the punch retainer is indispensable depending on the situation.

As this method, Japanese Patent Publication No. 54-40798 is known.
In the publication, a punch retainer is arranged on a die bush, a punch and a die hole are aligned in advance, an adhesive is applied to the upper surface of the punch retainer, and the upper die is lowered and pressed to bond the adhesive. A method has been proposed in which a punch retainer is temporarily fixed, and then the upper die is raised, the punch retainer is tightened with a bolt, and a knock pin is driven. However, this method requires a troublesome work of applying the adhesive and 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 mold. If there is a problem. In addition, there is a problem that it is difficult to correct the position of the punch when the punch retainer is fixed by bolting and knocking the pin to fix the punch retainer in order to glue the punch retainer. there were. Japanese Utility Model Laid-Open Publication No. 58-157227 discloses a cam piercing device in which a pierce punch is slidably supported by a retainer that can rotate about a point on the axis of the pierce punch, but this pierce device is disclosed. Even if the position of the punch can be adjusted, it is ineffective in discriminating and confirming whether the axes of the punch and the die, which are the prerequisites, match, and cannot be performed during the stroke. Time was unavoidable. In addition, it is not easy to confirm the centering after the position adjustment of the pierce punch, and there is a problem that it is difficult to correct the position of the punch when the centering is slightly misaligned.

The present invention has been devised in order to solve the above-mentioned problems. The purpose of the present invention is to determine whether the alignment is appropriate or not by simply visually recognizing from the outside during the punch stroke. It is an object of the present invention to provide a practical punch retainer that can easily perform centering, position adjustment, and fixing of a die and a die hole.

[0005]

According to the present invention, in order to achieve the above object, a punch insertion hole for removably inserting a punch into a block-shaped body and a bolt for fixing the block-shaped body to an upper die are inserted. In the case where a bolt hole is provided, a plurality of vertical holes are provided at intervals in the block-shaped body near the punch insertion hole and the bolt hole, and an elastic body is urged by each of these vertical holes, and the upper surface of the block-shaped body is urged by the elastic body. And a plunger pin that is immersible until it is flush with the upper surface of the block-shaped body with the tip abutting on the upper mold when necessary. It is.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 flange. Reference numeral 1 denotes a block-shaped main body, which has a punch insertion hole 10 in the height direction, and has at least two bolt holes 11 with seats at positions different from the punch insertion hole 10. In this example,
The punch insertion hole 10 has a seat hole 100 on the upper surface side.
2 is a punch, which is inserted through the punch insertion hole 10;
It 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 a backing plug 2a is superimposed on the upper surface of the flange as shown in FIG.
Positioning is performed by fitting the lower part of the knock pin 201 into the pin 0 and fitting the knock pin into a pin hole provided in the upper mold in advance. Bolts 4 and 4 are inserted through the seated bolt holes 11 and are fixed to the block-shaped main body 1 by being screwed into screw holes to be provided in the upper die in advance.

The above construction is the same as that of the conventional punch retainer, but in the present invention, the jig 5 for centering is provided on the block-shaped main body 1. This jig for alignment is a block-shaped main body 1
A plurality of thin plunger pins 6 arranged at two or more locations (preferably three or more locations) and a coil spring 7 for urging the plunger pins 6 so as to always project upward from the block-shaped main body 1. The coil spring 7 is built in the block-shaped main body 1, and the plunger pins 6 have the same protruding length. In this embodiment, two vertical holes 12, 12 are formed in the vicinity of the punch insertion hole 10 and the bolt holes 11, 11, respectively, and each of the vertical holes 12, 12 is close to the upper surface of the block-shaped main body 1. It has a step, and a thin pin hole extends from the center of the step. The plunger pin 6 has a piston 60 that fits in the thin pin hole and that is slidably fitted in the vertical hole 12 in the lower part. A plug 8 is screwed into the lower end of the hole 12, and a coil spring 7 having a relatively low 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 cylindrical casing 9, and the cylindrical casing 9 is connected to the vertical hole 1 having a female thread.
2 is screwed.

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. 1 and 2 are merely examples of the present invention, and can be applied to punch retainers of various types and structures. That is, a retainer for a deformed punch with a flange having a pin hole for inserting a threaded knock pin and a locking pin insertion groove crossing the punch insertion hole, and a ball lock punch having a hole obliquely communicating with the punch insertion hole. The present invention can be applied to all types of punch retainers, such as a retainer, a collective retainer capable of being equipped with a plurality of punches, a screw retainer, and a punch retainer in which a punch is held by a tapered surface of a shank without a brim.

[0009]

The operation and operation of the punch retainer according to the present invention will now be described. The upper die 3 is formed with female screw holes 31 and 31 and a pin hole 30 by an NC machine tool or the like. A button die 14 is attached to the lower die 13.
In this state, when the punch is fastened and fixed to the upper die 3 via the punch retainer, the punch 2 is inserted and held in the punch insertion hole 10 of the block-shaped main body 1 as shown in FIG. Next, the bolt holes 11, 1 with the seats of the block-shaped main body 1 are formed.
Then, the bolts 4 are inserted into the female screw holes 31 of the upper die 3 lightly. The screwing amount needs to be large enough to hang the block-shaped main body 1 and to abut the lower ends of the upper dies 3 with the tips of the plunger pins 6 and 6. The plunger pins 6 and 6 have the same length and are urged by coil springs 7 and 7. For this reason, each head 40 of the bolts 4 and 4 is
The block-shaped main body 1 is brought into contact with the seat portions 110 of the first and the first 11 with a predetermined set load, and the posture of the block-shaped main body 1 is corrected by the plunger pins 6 and 6, so that the block-shaped main body 1 is balanced with the lower surface of the upper die 3 with a distance h. To position.

Next, the press is operated to lower the upper die 3 gently. Then, the block-shaped main body 1
Is lowered while being suspended by the bolts 4, 4, and the cutting edge 21 of the punch 2 is
It is inserted into 40. At this time, if the axes of the punch 2 and the die hole 140 match, the punch 2 does not touch the die hole 140, so that the punch 2 continues to descend smoothly and no lifting force works. That is, the distance h between the block-shaped main body 1 and the upper die 3 remains the same as in FIG. Therefore, the suitability of the alignment can be checked and determined extremely easily. When the cores are aligned in this way, the upper mold 3
Then, the bolts 4 and 4 may be turned and tightened, and the plunger pins 6 and 6 are pushed in until they are flush with the block-shaped main body 1 against the spring force of the coil spring 7. Prevents bolts 4 and 4 from loosening as tensioning elements.

On the other hand, when the axis of the punch 2 is not aligned with the axis of the die hole 140 at the time of lowering, the punch 2
Since the punch 2 comes into contact with the 0 wall, a downward resistance is generated in the punch 2, which is transmitted to the block-shaped main body 1. For this reason, as shown in FIG. 5, the plunger pins 6, 6 are pressed by the upper die 3, and are pushed into the block-shaped main body 1 against the urging force of the coil springs 7, 7. Thereby, the block-shaped main body 1 approaches the upper mold 3. Therefore, it can be instantaneously determined or confirmed from outside whether or not the axes of the punch 2 and the die hole 140 are aligned. When the axes of the punch 2 and the die hole 140 are not aligned as described above, the upper die 3 is once raised. The seated bolt holes 11 and 11 are holes without screws and have a clearance between the bolts 4 and the outer diameter. Therefore, the block-shaped main body 1 is shifted within the clearance, or the bolts 4 and 4 are centered. The main body 1 is moved in a vertical plane to adjust the position, and the upper mold 3 is lowered again. During this stroke, the distance h between the block-shaped main body 1 and the upper mold 3 is h.
4 remains in the state shown in FIG.
Therefore, the bolts 4 and 4 may be directly tightened as described above. Therefore,
The punch retainer can be easily fixed to the upper mold in an accurate alignment state.

From the above, when the present invention is applied,
Although the center knock pin of the punch 2 can be omitted, when the center knock method is applied, the lower part of the knock pin 201 is fitted into the pin hole 200 of the backing plug 2a during or after centering, and the knock pin is used. What is necessary is just to fit the upper part of 201 into the pin hole 30 of the upper die.

[0013]

According to the present invention described above, a punch insertion hole 10 for inserting a punch into and out of the block-shaped main body 1 and a bolt for inserting a bolt 4 for fixing the block-shaped main body 1 to the upper die 3 are provided. In the case where the holes 11 are provided, a plurality of vertical holes 12 are provided at intervals in the block-shaped main body 1 near the punch insertion hole 10 and the bolt holes 11, and each of the vertical holes 12 is biased by the elastic body 7. The plunger pins 6 and 6 protrude from the upper surface of the block-shaped main body with the same length, and can be immersed in the state where the front end is in contact with the upper die 3 as required, until the upper surface becomes flush with the upper surface of the block-shaped main body Since the jig is provided, the punch insertion hole 10
The punch 2 is attached to the bolt 4 and the bolt 4 is inserted through the bolt hole 11 so that the tips of the plunger pins 6 and 6 come into contact with the lower surface of the upper die 3.
Is lightly screwed into the upper die 3 so that the block-shaped main body 1 faces the lower surface of the upper die 3 with an equilibrium degree while leaving a space h. (If the axis of the punch 2 does not match the axis of the die hole, the plunger pins 6, 6 are pushed into the block-shaped main body 1 against the urging force of the elastic body 7, and the block h is blocked. The main body 1 approaches the lower surface of the upper mold 3), so that it is possible to instantly confirm and determine whether or not the axes of the punch 2 and the die hole match, and to stroke the upper mold 3 even after the position adjustment. By recognizing the distance h from the outside, the alignment can be reconfirmed. Therefore, the alignment with the die hole and the adjustment work can be performed easily and quickly, and the punch retainer can be fixed to the upper die in an accurate alignment state. Further, if the block-shaped main body 1 is fixed to the upper mold 3 by the bolts 4 after the centering, the plunger pins 6 and 6 become flush with the block-shaped main body 1 against the urging force of the elastic bodies 7 and 7. As a result, it is possible to prevent the bolt 4 from being loosened as a tensioning element, and to obtain excellent effects such as simple structure and low cost.

[Brief description of the 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 the 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 cross-sectional view illustrating a use state of the present invention.

FIG. 5 is a sectional view showing a state of the punch retainer when the center is not aligned.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Block-shaped main body 2 Punch 3 Upper die 4 Bolt 6 Plunger pin 7 Elastic body 10 Punch insertion hole 11 Bolt hole with seat 12 Vertical hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A block-shaped main body 1 having a punch insertion hole 10 for removably inserting a punch and a bolt hole 11 for inserting a bolt 4 for fixing the block-shaped main body 1 to an upper die 3. The punch insertion hole 10 and the bolt hole 11
A plurality of vertical holes 12 are provided at intervals in the block-shaped main body 1 in the vicinity of the elastic body 7, and each of the vertical holes 12 is urged by the elastic body 7 to protrude from the upper surface of the block-shaped main body with the same length. A punch retainer comprising a centering jig including plunger pins (6, 6) that can be immersed in contact with the upper die (3) until it is flush with the upper surface of the block-shaped main body.