JP2002011531A - Punch die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a punch die capable of precisely positioning a punch tip for a punch body. SOLUTION: In the punch die arranged with a punch tip 5 attachably/ detachably to a lower part of a punch body 3 arranged in a punch guide 1, a punch tip mounting hole 19, in which two faces are formed as reference faces 21A, 21B, is formed at a lower part of the punch body 3, an engaging groove 29 inclined in an inserting/detaching direction of the punch tip 5 for the punch mounting hole 19 is formed on the punch tip 5 attachably/detachably inserted into the punch tip mounting hole 19, at a position facing the reference face 21A, a pin 31 is arranged as freely engaging/disengaging, further, a pressing member 33 is arranged as freely pressing the pin 3 in a punch tip direction, the engaging groove 29 having the punch tip 5 is formed at a center part of the punch tip 5 and a punch cutting edge part 5B formed at both end parts of the punch tip 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch die mounted on a punch press such as a turret punch press and used for punching a plate-like work. The present invention relates to a punch die having a configuration in which a punch chip is detachably attached to the punch body, the punch die being capable of accurately positioning the punch chip with respect to the punch body.

[0002]

2. Description of the Related Art The configuration of a conventional punch die of this type is, for example, as shown in FIG. That is, for example, a punch body 3 is vertically movably fitted into a cylindrical punch guide 1 supported by an upper die holder in a punch press (not shown) such as a turret punch press or the like. A punch chip 5 having punch blade portions 5B at both upper and lower ends is detachably attached to the punch body 3 by bolts 7.

A retainer collar 9 is detachably mounted on the upper portion of the punch guide 1 via an O-ring 11. A screw portion provided at the lower end of a punch driver 13 which penetrates the retainer collar 9 so as to be vertically movable. 13S is detachably screwed to the upper end of the punch body 3. A powerful stripper spring 17 is elastically mounted between the punch head 15 screwed to the upper end of the punch driver 13 so as to adjust the position value and the retainer collar 9.

In the above configuration, the retainer collar 9 and the punch body 3 are pulled upward from the punch guide 1 against the urging force of the O-ring 11, and then the punch body 3 is removed from the screw portion 13S of the punch driver 13. Thus, by loosening the bolt 7 and removing the punch chip 5 from the punch chip mounting hole 19 of the punch body 3 and mounting it upside down, the punch chip 5 can be reused without being polished again.

[0005]

In the conventional configuration as described above, the punch chip mounting hole 1 of the punch body 3 is not provided.
Since a small gap exists between the punch 9 and the punch chip 5 and between the through hole of the punch body 3 and the bolt 7, for example, a ball bush or the like is provided between the inner peripheral surface of the punch guide 1 and the punch body 3. Even if the punch guide 1 and the punch body 3 are fitted to each other with high precision through the zero clearance state and the axes are aligned, the punch body 3
It is difficult to maintain the positional relationship between the punch tip 5 and the punch chip 5 with high precision, and for example, there is a problem that it is not possible to guarantee that the axes are aligned.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and the invention according to claim 1 is to provide a punch body in a cylindrical punch guide so as to be vertically movable. In a punch die having a punch chip detachably provided at a lower portion of the punch body, a punch chip mounting hole formed with two surfaces provided in an intersecting direction as reference surfaces is provided at a lower portion of the punch body. The punch chip removably inserted into the mounting hole is provided with an engaging groove inclined with respect to the direction in which the punch chip is inserted into and removed from the punch chip mounting hole, and the engaging groove is provided at a position facing the one reference surface. In this configuration, a detachable pin is provided in the groove, and a pressing member that can press the pin in the direction of the punch chip is provided.

According to a second aspect of the present invention, in the punch die according to the first aspect, the engaging groove provided on the punch chip includes:
The punch chip is provided at a central portion or a symmetrical position around the central portion, and a punch blade portion is provided at both ends of the punch chip.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following, components having the same functions as those of the above-described conventional configuration will be denoted by the same reference numerals, and redundant description will be omitted. . The core of the present invention lies in the structure for attaching the punch chip to the punch body.

Referring to FIG. 1, a punch body 5 is provided at a lower portion of a punch body 3 which is fitted in a cylindrical punch guide (not shown in FIG. 1) so as to be vertically movable. A chip mounting hole 19 is formed. Since the punch chip 5 is rectangular in this example, the punch chip mounting hole 19 is formed in a square mounting hole, and an A surface 21A provided in a direction intersecting the punch chip mounting hole 19 is provided. And the B surface 21B are formed as reference surfaces which are finished with high precision. A plurality of fluid ejection grooves 23 for ejecting a fluid are formed at appropriate positions on the inner peripheral surface of the punch tip mounting hole 19, and an introduction hole for introducing a fluid is provided at the center of the punch body 3. 25 are formed. A communication groove 26 that communicates with the fluid ejection groove 23 is connected to a lower end of the introduction hole 25.

At both ends of the punch chip 5, punch blade portions 5B are formed, and contact surfaces 27A and 27B are provided to be able to contact the reference surfaces 21A and 21B of the punch chip mounting hole 19. is there. On the side surface of the punch chip 5 opposite to the one contact surface 27A, an engagement groove 29 is formed which is inclined with respect to the direction in which the punch chip 5 is inserted into and removed from the punch chip mounting hole 19. The engaging grooves 29 are provided at the punch blade portions 5B, 5B at both ends of the punch chip 5.
It is desirable to provide them at a central portion between them, but in some cases, they can be provided at symmetrical positions around the central portion. In addition, the engagement groove 29 may be provided continuously long or may be divided into a plurality and formed short. Furthermore, it is also possible to provide the opposite surface (for example, the contact surface 27A) with the inclined direction reversed.

In order to fix the punch chip 5 in the punch chip mounting hole 19, the punch chip mounting hole 19 is fixed.
In the position facing the one reference surface 21A, a pin 31 that can be engaged is arranged in an inclined manner corresponding to the engaging groove 29 of the punch chip 5, and the pin 31 is moved in the direction of the punch chip 5. There is provided a pressing member 33 having an inclined surface 33 </ b> A that is inclined to press inward. Further, a tightening tool 35 such as a bolt capable of tightening the pressing member 33 is provided.

In the above configuration, as shown in FIG. 1, the punch chip 5 is inserted into the punch chip mounting hole 19 of the punch body 3, and the pin 31 is engaged with the engaging groove 29 formed in the punch chip 5. Fastening tool 3
When the pin 31 is pressed toward the punch chip 5 by the pressing member 33, the contact surface 27A of the punch chip 5 is pressed.
Is pressed against one reference surface 21A. In addition, since the engaging groove 29 is inclined, a component force in the upward direction V and a component force in the lateral direction H act, and the upper surface of the punch chip 5 is pressed against the ceiling of the punch chip mounting hole 19. At the same time, the contact surface 27B is pressed against the reference surface 21B so that the punch chip 5 is accurately positioned with respect to the punch chip mounting hole 19.

When the punch blade 5B of the punch chip 5 is worn, the fastener 35 is loosened to remove the punch chip 5 from the punch chip mounting hole 19, and the punch chip 5 is turned upside down again. By attaching, the punch chip 5 can be mounted in the punch chip mounting hole 19 with good reproducibility.

In the above description, the case where the engaging groove 29 is formed in the center of the punch chip 5 has been described. However, the punch chip mounting hole 1 formed in the punch body 3 has been described.
When the groove 9 is shallow, the engaging grooves 29 may be formed symmetrically around the center of the punch chip 5, and the engaging grooves 29 may be formed on the surfaces opposite to each other. It is.

FIGS. 4 and 5 show a case in which the punch chip 5 has a cylindrical shape. Components having the same functions are denoted by the same reference numerals, and redundant description is omitted. Reference numeral 41 shown in FIG. 4 is a relief portion formed on both sides of the reference surfaces 21A and 21B. Even in this configuration, the effects as described above can be obtained.

[0016]

As will be understood from the above description, according to the present invention, it is possible to position the punch chip by abuttingly pressing the two reference surfaces in the punch chip mounting holes formed in the punch body. Thus, the punch chip can always be accurately positioned and fixed with respect to the punch body, and the conventional problem as described above can be solved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a mounting structure of a punch chip to a punch body in a punch die according to an embodiment of the present invention.

FIG. 2 is a low side view showing a mounting structure of a punch tip to a punch body in a punch die according to an embodiment of the present invention.

FIG. 3 is an explanatory perspective view of a punch chip.

FIG. 4 is a low-level view of a second embodiment.

FIG. 5 is a perspective explanatory view in the case where a punch chip has a cylindrical shape.

FIG. 6 is an explanatory sectional view showing a configuration of a conventional punch die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Punch guide 3 Punch body 5 Punch tip 7 Fixture (bolt) 13 Punch driver 19 Punch tip mounting hole 21A, 21B Reference surface 27A, 27B Contact surface 29 Engagement groove 31 Pin 33 Pressing tool 35 Fastening tool

Claims (2)

[Claims] 1. A punch die having a punch body provided vertically inside a cylindrical punch guide, and a punch chip detachably mounted on a lower portion of the punch body, in a direction intersecting with a lower portion of the punch body. A punch chip mounting hole formed with the two provided surfaces as reference surfaces is provided, and a punch chip removably inserted into the punch chip mounting hole is inclined with respect to a direction in which the punch chip is inserted into and removed from the punch chip mounting hole. It is characterized in that an engaging groove is provided, a pin which is detachable from the engaging groove is provided at a position facing the one reference surface, and a pressing member which is capable of pressing the pin in the direction of the punch chip is provided. And punch mold. 2. The punch die according to claim 1, wherein
The punch is characterized in that the engagement groove provided in the punch chip is provided at a central portion of the punch chip or at a symmetrical position centered on the central portion, and a punch blade portion is provided at both ends of the punch chip. Mold.