JP2002018535A - Punch die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a punch die capable of easily aligning shaft centers of a punch body and a punch tip in a constitution in which the punch tip is freely mounted/dismounted to the punch body. SOLUTION: In a punch die arranged with a collet chuck 29 freely mounting/ dismounting the punch tip 27 in an accommodation hole 21 formed to a tip of the punch body 3, the collet chuck 29 is provided with a outer cylinder 31 arranged with a taper hole, an inner cylinder 33 which is fitted into the taper hole to be reduced and freely fastens the punch tip 27, a pressing ring member 37 to freely press the outer cylinder 31 in the direction of an accommodation hole 21 inside, and a punch locking part 35 arranged with an inward protruding part 35P freely engaging a peripheral groove 27G formed to the punch tip 27.

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 mounted so as to be able to accurately perform positioning by aligning the axis of the punch chip with the axis of the punch body.

[0002]

2. Description of the Related Art Conventionally, the configuration of a 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 tip 5 having a punch blade portion 5B at the tip is detachably attached to the punch body 3 by a bolt 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 strong stripper spring 17 is elastically mounted between the punch head 15 screwed to the upper end of the punch driver 13 so as to be position-adjustable and the retainer collar 9.

In the above configuration, the punch 7 is pulled upward from the punch guide 1 against the O-ring 11 and then the punch body 3 is removed from the screw portion 13S of the punch driver 13 to loosen the bolt 7. The punch chip 5 can be reused by removing the punch chip 5 from the punch chip mounting hole 19 of the punch body 3 and regrinding the punch chip 5.

[0005]

In the conventional configuration as described above, the punch chip mounting hole 1 of the punch body 3 is not provided.
Since there is a minute gap 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, the punch guide 1 and the punch body 3 are fitted with high precision and the shaft center is formed. Even if the positions match, it is difficult to maintain the positional relationship between the punch body 3 and the punch chip 5 with high accuracy, and for example, there is a problem that it is not possible to guarantee that the axes are aligned.

[0006]

DISCLOSURE 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 for mounting and dismounting a punch chip in a storage hole formed at a tip portion of a punch body. In a punching die provided with a free collet chuck, the collet chuck has an outer cylinder having a tapered hole, and an inner cylinder which is fitted in the tapered hole of the outer cylinder and whose diameter can be reduced and a punch tip can be fastened. And a pressing ring member capable of pressing the outer cylinder inwardly of the storage hole, and a punch locking portion including an inwardly protruding portion that is freely engageable with a peripheral groove formed in the punch chip. .

According to a second aspect of the present invention, there is provided a punch die having a collet chuck in which a punch chip can be detachably mounted in a storage hole formed at a tip end portion of a punch body, wherein an outer peripheral surface of the collet chuck is provided in the storage hole. In the punch body, a pull bolt for pulling the collet chuck into the storage hole is provided in the formed tapered hole portion so as to be detachably formed in the tapered hole portion.

According to a third aspect of the present invention, in the punching die according to the second aspect, the pull bolt is provided so as to be freely screwed with the punch tip engaged with the collet.

According to a fourth aspect of the present invention, there is provided a punch die in which a punch chip is detachably mounted in a storage hole formed at a tip portion of a punch body, wherein the punch chip is integrated into the storage hole by shrink fit. It is.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same reference numerals are given to components having the same functions and effects as those of the above-described conventional configuration. Is omitted.

Referring to FIG. 1, a receiving hole 21 is formed at the tip of the punch body 3 in the punch die, and a fluid for introducing a fluid from the outside is provided at the center of the punch body 3. An introduction hole 23 is formed, and a radial (radial) groove 25 is formed in a portion where the fluid introduction hole 23 communicates with the storage hole 21.

A collet chuck 29 to which the punch chip 27 can be attached and detached is provided in the storage hole 21. More specifically, the collet chuck 29 includes an outer cylinder 31 fitted movably in the axial direction in the storage hole 21. The inner peripheral surface of the outer cylinder 31 is formed as a tapered hole having a large diameter on the distal end side at the back of the storage hole 21. An inner cylinder 33 having an outer peripheral surface formed into a taper corresponding to the tapered hole of the outer cylinder 31 is fitted into the tapered hole of the outer cylinder 31.
The body 27 of the punch chip 27 is
Slits 33S are formed at a plurality of locations so that the diameter can be reduced to tighten B.

Furthermore, a peripheral groove 27G formed by forming a taper portion having an appropriate diameter formed on the upper end of the punch tip 27, in this example, an upper side having a large diameter in the upper portion of the inner cylinder 33. Inwardly protruding portion 35P that can be engaged with
Is provided with a ring-shaped punch locking member 35 having. The punch locking member 35 is formed with a slit (notch portion: not shown) extending from the inner peripheral surface to the outer peripheral surface so that the diameter can be enlarged or reduced, and an O-ring for reducing the diameter is provided on the outer peripheral surface. Although the O-ring 39 is provided, the O-ring 39 can be omitted when the elastic deformation of the punch locking member 35 is used. It is also possible to divide the punch locking member 35 into a plurality of parts and bind them with an O-ring or the like so that the punch locking member 35 can be enlarged or reduced.

In order to eject the fluid introduced from the fluid introduction hole 23 into the storage hole 21 in the direction of the tip portion 27E of the punch tip 27, a plurality of punch engagement members 35 and a plurality of inner peripheral surfaces of the inner cylinder 33 are provided. The fluid passage grooves 35G and 33G
Are formed respectively.

In order to press the outer cylinder 31 inward of the storage hole 21, the tip of the punch body 3 is formed to have a slightly smaller diameter. A pressing ring member (nut member) 37 is screwed so that the position can be adjusted. Then, the pressing ring member 37
Is formed to have a diameter substantially equal to the diameter of the punch body 3, and an inward projecting portion 37 rotatably engaged with the outer cylinder 31 so as to move the outer cylinder 31 in the axial direction.
P is provided.

In the above configuration, the nut member 3
7, the outer cylinder 31 of the collet chuck 29 moves in a direction to come off the storage hole 21,
The fitting state with the inner cylinder 33 is loosened, and the tightening of the punch chip 27 by the inner cylinder 33 is released. Therefore, the nut member 37, the punch tip 27 and the collet chuck 29
Both are taken out of the storage hole 21 and the punch chip 27 is
When pulled downward, the punch locking member 35 becomes an O-ring 39.
The punch protrusion 35P of the punch locking member 35 and the punch tip 27 are elastically deformed so that the diameter increases.
Thus, the engagement with the peripheral groove 27G formed is released, and the punch chip 27 is removed.

Thereafter, after the punch chip 27 is polished again, or when a new punch chip 27 is inserted into the inner cylinder 33 of the collet chuck 29 and pushed down to the innermost part, the diameter of the punch locking member 35 is reduced. And the inwardly protruding portion 35P of the punch locking member 35 is reengaged with the circumferential groove 27G of the punch chip 27, thereby holding the punch chip 27 so as not to easily come off. .

Then, all the punch chips 27 incorporated in the collet chuck 29 and the punch locking member 35 are inserted into the storage holes 21 while tightening the nut members 37.

Thereafter, the punch chip 27 is pushed into the innermost part, that is, the upper surface of the head of the punch chip 27 is kept in contact with the ceiling of the storage hole 21, and the nut member 37 is tightened. By further rotating, the outer cylinder 31 of the collet chuck 29 is pushed into the storage hole 21 and the inner cylinder 33 is tightened.
7 is fixedly fastened to the inner cylinder 33.

Therefore, according to the above configuration, the punch chip 27 is fixed to the punch body 3 by tightening and fixing the body 27B by the punch locking member 35 and the collet chuck 29 which are in contact with the inner peripheral surface of the storage hole 21 on the outer peripheral surface. On the other hand, the positioning in the axial direction is performed, and the axis is fixed so as to match. And in the above configuration,
When the punch chip 27 tries to escape, the inner cylinder 3
3 also tries to move integrally in the direction in which it comes off due to friction and is more cooperatively tightened by the action of the tapered portion, so that the punch tip 27 does not come off. Also, the punch chip 27 can be detached and replaced by an external operation without the need for tools or the like.

In the above description, the outer cylinder 31
In the above description, the inner peripheral surface is formed in a tapered hole.
1 is formed into a corresponding taper, and the storage hole 21 is formed.
The outer cylinder 31 may be provided with a slit so that the outer cylinder 31 contracts in diameter as the outer cylinder 31 is inserted.

With this configuration, the storage hole 2
It is easy to match the axis of the punch 1 with the axis of the outer cylinder 31, and the punch tip 2
7 can be matched with higher accuracy.

FIG. 2 shows a second embodiment. In the second embodiment, the inner cylinder 33 and the punch locking member 35 are connected by a connecting portion 41, and the slit 33S is This is a configuration in which an appropriate number of slits S in the opposite direction are provided and the O-ring 39 is omitted, and the other configuration is substantially the same as that of the first embodiment.
According to this configuration, the same effect as in the first embodiment can be obtained, and the number of components is reduced, and the configuration is further simplified.

FIG. 3 shows a punch die according to a third embodiment. In the third embodiment,
A tip end side of the storage hole 21 formed in the punch body 3 is formed in a tapered hole 21T, and a collet 43 having a slit 43S so that the punch tip 27 can be tightened and fixed. 43T is formed. The collet 43 has a screw hole 43H into which the bolt 7 as a pull bolt can be screwed, and a groove 43G through which fluid can pass is formed from the upper outer surface to the inner peripheral surface.

In the above configuration, the collet 43 can be moved into and out of the storage hole 21 by rotating the bolt 7, and the punch tip 27 can be moved in and out of the collet 43.
Can be fixed and loosened. At this time, the axis of the storage hole 21 and the axis of the collet 43 coincide with each other by the function of the tapered hole 21T, and the axis of the collet 43 coincides with the axis of the punch chip 27.

In the above configuration, the screw hole 43H provided in the collet 43 may be formed as a through hole, and the punch tip 27 may be freely screwed to the tip of the bolt 7 passing through the through hole. In this case, the tip of the bolt 7 is screwed into the punch chip 27 to pull the punch chip 27 and the collet 43 at the same time.
The centering and fixing of the punch chip 27 can be effectively performed.

FIG. 4 shows a fourth embodiment. In this embodiment, a punch chip 27 is directly fitted into a storage hole 21 formed at the tip of a punch body 3.
For example, it is a structure integrated by shrink fitting using heat shrinkage such as shrink fitting.

In this configuration, since the fixing and integration of the punch chip 27 with the punch body 3 can be performed firmly with a simple configuration, even if the punch chip 27 has a very small diameter, it can be easily implemented. And it can be integrated strongly.

[0029]

As will be understood from the above description of the embodiment, the invention according to claim 1 is directed to a punch provided with a collet chuck in which a punch chip can be freely attached and detached in a storage hole formed at the tip of a punch body. In the mold, the collet chuck includes an outer cylinder having a tapered hole, an inner cylinder fitted into the tapered hole of the outer cylinder, the inner cylinder being capable of being reduced in diameter and being capable of tightening a punch tip, and the outer cylinder being housed therein. It is configured to include a pressing ring member that can be pressed inward in the hole and a punch locking portion that has an inwardly projecting portion that can be engaged with a peripheral groove formed in the punch chip.

Therefore, when the punch chip is mounted on the punch body, the punch chip is held by the punch locking portion, so that the mounting and dismounting of the punch chip with respect to the collet chuck is reliable and easy. Further, the axial center of the punch body is made to coincide with the axial center of the punch body, and positioning in the axial direction can be performed easily, so that mounting can be performed with high accuracy.

According to a second aspect of the present invention, there is provided a punch die having a collet chuck in which a punch chip can be detachably mounted in a storage hole formed at a tip end portion of a punch body. The punch body may be provided with a taper that is detachably formed in the formed tapered hole, and a pull bolt for pulling the collet chuck into the storage hole is provided in the punch body.

Therefore, the same effects as described above can be obtained, and the structure becomes simpler.

According to a third aspect of the present invention, in the punching die according to the second aspect, the pull bolt is provided so as to be screwable with the punch tip engaged with the collet, so that the punch tip and the collet are simultaneously fixed. Is what you can do.

According to a fourth aspect of the present invention, there is provided a punch die in which a punch chip is detachably mounted in a storage hole formed at a tip portion of a punch body, wherein the punch chip is integrated into the storage hole by shrink fit. Therefore, the configuration becomes simpler, and the punch chip can be more firmly fixed and integrated with the punch body.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing only a main part of a punch die according to a first embodiment of the present invention.

FIG. 2 is an explanatory cross-sectional view showing only a main part of a punch die according to a second embodiment of the present invention.

FIG. 3 is an explanatory view showing only a main part of a punch die according to a third embodiment of the present invention.

FIG. 4 is an explanatory cross-sectional view showing only a main part of a punch die according to a fourth embodiment of the present invention.

FIG. 5 is an explanatory cross-sectional view showing an overall configuration of a conventional punch die.

[Explanation of symbols]

 Reference Signs List 1 punch guide 3 punch body 7 bolt 21 storage hole 27 punch tip 29 collet chuck 31 outer cylinder 33 inner cylinder 35 punch locking member 37 pressing ring member

Claims (4)

[Claims] 1. A punch die having a collet chuck for detachably attaching a punch chip in a storage hole formed at a tip end portion of a punch body, wherein the collet chuck comprises: an outer cylinder having a tapered hole; An inner cylinder fitted into the tapered hole, the diameter of which can be reduced and a punch chip can be freely tightened; a pressing ring member capable of pressing the outer cylinder inwardly of the storage hole; and a circumferential groove formed in the punch chip. A punch die characterized by having a punch locking portion having a free inwardly projecting portion. 2. A punch die having a collet chuck for detachably attaching a punch chip in a storage hole formed at a tip end portion of a punch body. A punch die, characterized in that the punch body is provided with a detachable taper and a pull bolt for pulling the collet chuck into the storage hole is provided in the punch body. 3. The punch die according to claim 2, wherein
A punch die characterized in that the pull bolt is provided so as to be screwable with a punch tip engaged with a collet. 4. A punch having a punch die detachably mounted in a storage hole formed at a tip end portion of a punch body, wherein the punch chip is integrated into the storage hole by shrink fitting. Mold.