JPH0123627Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a punch assembly, and more particularly to a punch assembly including a removable punch tip at the tip of a punch body.

FIG. 1A shows the punch assembly 1 as a whole.

The punch assembly 1 is attached to the upper arm of the punch set or the upper plate of the turret, and by striking the punch head 5 provided at the upper end of the punch body 3 with the ram or puncher of the press, the punch assembly 1 is attached to the upper arm of the punch set or the upper plate of the turret. This is an upper die device that performs a desired punching process on a plate material between it and a die provided on the lower arm of the punch set or the lower plate of the turret.

In the above-mentioned punching process, the desired hole is usually formed in one punch, so even if we only use round holes as an example, it is necessary to prepare a large number of punches and dies with different diameters. First, it is necessary to prepare various types with different clearances depending on the thickness and material of the plate material to be processed.

This resulted in the inconvenience of having to invest a large amount of money in molds.

In particular, the punch assembly 1 includes, in addition to the punch body 3,
The punch guide 7, the stripper spring 9, and the stripper plate 11 are attached to the die, which has the disadvantage of requiring a larger investment compared to a die that has almost no attached positions.

The present invention has been devised to overcome the above-mentioned disadvantages of the conventional punch assembly, and preferred embodiments thereof will be described in detail below with reference to the drawings.

The punch assembly 1 has a punch body 3 whose upper part has a small diameter, and a guide collar 15 that can freely slide on this small diameter part 13 and a spring washer 17 that is in contact with the lower surface of the punch head 5. The above-described stripper spring 9 is compressed and provided between the two.

The punch guide 7 is attached to the lower surface of the spring receiving flange portion of the guide collar 15 with a set screw 19.
Since the upper end flange portion of the punch guide 7 is urged upward by the lift spring 21, the entire punch assembly 1 is floated by the lift spring 21.

Furthermore, an engagement protrusion 23 is provided at the lower end of the punch body 3, and a punch tip 27 having an engagement recess 25 that engages with the engagement recess 23 is inserted therein.

The punch guide 7 maintains its directionality with a vertical groove 29 provided on a part of the outer periphery and a guide key (not shown). The directionality of the punch tip 27 is maintained by the engagement of the provided guide pin 33.

A punch tip 2 is provided in a portion of the engagement recess 23 of the punch body 3, as shown in B in FIG.
An engagement and release device 35 for engaging and disengaging the punch body 3 is provided.

This engagement/release device 35 is provided with a locking piece that is rotatable in the direction of an arrow 39 around a shaft 37 when the punch guide 7 is removed from the punch body 3, and this locking piece is provided on the punch tip 27. It is possible to freely choose whether to leave the cut groove 41 or to sit.

When the aforementioned locking piece engages with the cut groove 41, the ball plunger 43 enters the conical hole 47 provided in the bottom surface of the locking piece by the urging force of the bullet 45.

The punch assembly 1 includes a stripper plate 49 and its attachment/detachment mechanism 51 as shown enlarged in FIGS. 2 and 3.

As is clear from FIG. 3, the attachment/detachment mechanism 51 is formed by cutting the lower end of the outer periphery of the punch guide 7 along a secant line, and providing three portions extending into chord-shaped vertical grooves (hereinafter simply referred to as vertical grooves 53).

The outer circumferential groove 55 of the stripper plate 49 is exposed at the vertical groove 53, and the steel wire 57 is attached to the stripper plate 4 at the three vertical grooves 53.
9 is pushed into the outer circumferential groove 55.

Furthermore, the steel wire 57 is fitted into the outer peripheral lower grooves 59 of the punch guide 7 at two locations between the three vertical grooves 53 described above.

A pin holder 61 as shown in FIG. 2 is provided near the center of the chord part of the vertical groove 53 of the punch guide 7, and the pin 63 can be freely attached to and removed from a hole passing through the pin holder 61 vertically. The steel wire 57 is pushed into the outer circumferential groove 55 of the stripper plate 49.

Since the punch assembly 1 is constructed as described above, take out the entire punch assembly 1 from the turret upper plate of the press or the upper arm of the die set, and remove the punch guide 7 from the guide collar 15 by loosening the set screw 19. For example, the locking piece can be rotated manually, and the punch tip 27 can be easily released from the punch body 3.

Needless to say, it is easy to engage the new punch tip 27 with the punch body 3.

As can be understood from the above description of the embodiments, the present invention basically consists of attaching the punch head 5 at the upper end of the punch body 3 which is fitted into the cylindrical punch guide 7 so as to be vertically movable, and the upper part of the punch guide 7. In the punch assembly, a stripper spring 9 is loaded between the punch body 3 and the guide collar 15, and a punch tip 27 is detachably attached to the lower end of the punch body 3.
The punch tip 27 is provided with an engagement protrusion 25 that is removably engaged with the engagement recess 23 provided at the lower end, and a groove 41 formed on the outer peripheral surface of the engagement protrusion 25 is provided with a releasable locking piece. The punch body 3 is rotatably mounted on the punch body 3 via a shaft 37, and the outer surface of the groove stopper is slidably in contact with the inner peripheral surface of the punch guide 7, and the lower end of the punch tip 27 is An outer circumferential groove 55 is provided on the outer circumferential surface of the surrounding disc-shaped stripper plate 49, and an elastic member provided at the lower end of the punch guide 7 is configured to be freely engageable and detachable from the outer circumferential groove 55. A plate 49 is detachably attached to the lower end of the punch guide 7.

As is clear from the above configuration, in the present invention, the punch tip 27 can be attached to and removed from the punch body 3 by engaging and disengaging the locking piece provided on the punch body 3 with respect to the groove 41 of the punch tip 27. However, since the locking piece is in sliding contact with the inner circumferential surface of the punch guide 7, the punch tip 27 cannot be attached or removed unless the punch body 3 is removed from the punch guide 7. In other words, the locking piece will not come off from the groove 41 of the punch tip 27 due to vibrations during punching, and the punch tip 27 will not fall off during punching.

Further, according to the present invention, the stripper plate 4
9 is removably provided at the lower end of the punch guide 7 via an elastic member, so that the plate material is strongly pressed and fixed at the peripheral edge of the punch tip 27 during punching, and the punch tip 2
Even if 7 is replaced in various ways, the punching accuracy can be improved.

It is also clear that the design can be easily changed without departing from the technical idea of the present invention.

[Brief explanation of the drawing]

FIG. 1A is a cross-sectional view of a punch assembly according to an embodiment of the present invention, FIG. 1B is a cross-sectional view taken along line B-B in FIG. 1A,
1C is a bottom view of FIG. 1A, FIG. 2 is an enlarged cross-sectional view of the lower end of the punch guide, and FIG. 3 is a bottom view of FIG. 2. Explanation of the symbols representing the main parts of the drawing, 1...
Punch assembly, 3... Punch body, 7... Punch guide, 23... Engagement recess, 25... Engagement protrusion, 27... Punch tip, 35... Engagement release device, 49... Stripper plate , 51... attachment/detachment mechanism, 57... steel wire, 61... pin holder.

Claims (1)

[Scope of utility model registration request] Punch head 5 at the upper end of punch body 3 fitted in cylindrical punch guide 7 so as to be movable up and down.
A stripper spring 9 is loaded between the guide collar 15 attached to the upper part of the punch guide 7,
A punch tip 27 is attached to the lower end of the punch body 3.
In this punch assembly, a punch tip 27 is provided with an engagement protrusion 25 that can be freely engaged with and detached from an engagement recess 23 provided at the lower end of the punch body 3. The groove 41 formed on the outer peripheral surface and the removable locking piece are connected to the punch body 3.
The locking piece is rotatably mounted on the punch tip 27 via a shaft 37, and the outer surface of the locking piece is slidably in contact with the inner peripheral surface of the punch guide 7, so as to surround the lower end of the punch tip 27. An outer circumferential groove 55 is provided on the outer circumferential surface of the disk-shaped stripper plate 49, and an elastic member 57 provided at the lower end of the punch guide 7 is configured to be freely engageable and detachable from the outer circumferential groove 55. 49 is attached to the lower end of the punch guide 7 in a detachable and replaceable manner.