FR2619521A1 - Universal punching tool - Google Patents

Abstract

The invention relates to a universal punching tool for metals. This universal tool 1 receives the punch 2 and the punch guide 3. With its plunging punch holder, it can receive all the punches and corresponding guides with the possibility of grinding (sharpening) over 10 mm and avoids using a specific assembly for each punch, hence allowing an enormous saving. The application of these universal tools is particularly advantageous on single- or multiple-station punching machines.

Description

The present invention relates to punching tools for metals by cutting them. These tools are used on punching machines with revolver turrets with multiple or single stations.

The tools known to date are in the form of an assembly consisting of: a punch, a steel punch guide, a cleaning spring, a striking nut and a washer. retained, the whole being maintained by screws. On this type of tool, a change of punch systematically results in the replacement of the entire tool. Hence its high cost. In addition, and given the very limited height of the impact nut to which the punch is fixed, the sharpening length of the latter is limited to 2 m / m. Also note that the steel punch guide has the disadvantage of scratching metals. The tool according to the invention makes it possible to avoid such an assembly specific to each punch. The targeted results are: 1) To replace the assembly of the tool specific to each punch by a one-piece, universal and homogeneous mechanism capable of receiving all round or shaped punches and its guide.

2) To have (thanks to the punch holder plunging into the one-piece mechanism) a long length of thread for fixing the punches, and therefore allow the sharpening length of the punch to be increased from 2 10 m / m.

3) To be able to replace the punch on the one-piece mechanism without having to dismantle and reassemble it.

4) To have a punch guide in composite materials so as no longer to scratch the metals and to be fixed instantly by a simple push upwards on the ring of the locking washer of the monobloc mechanism.

5) To prevent the unscrewing of the punch thanks to the rubber ring fixed on the tail of the punch and which is incinerated between the punch holder and the punch.

6) To have a tool of always constant height, even after sharpening the punch up to 10 m / m.

7) To be more economical because only the punches and their guides are to be changed and no longer the whole tool. To this must be added that the duration of use of the punch is to be multiplied by five because the sharpening height goes from 2 to 10 m / m.

 The accompanying drawing shows a sectional view of the tool with its one-piece, universal mechanism.

The one-piece mechanism of the universal tool consisting of its plunging punch holder 1, its stripping spring 2, its locking washer 3, and its retaining ring 4, all held by the circlip 5, receives the punch 6 provided with its brake ring 7, as well as the punch guide made of composite material 8, which is fixed by a simple upward push on the ring 4.

The possibilities of application of these tools are, taking into account their universality, the interchangeability of the punches, the sharpening length of these as well as their price, very appreciated by the industries possessing these punching machines.

Claims (1)

1) Universal punching tool. Characterized by the fact that the one-piece mechanism of the universal tool consisting of its plunging punch holder 1, its stripping spring 2, its locking washer 3, and its rubber retaining ring 4, all maintained by the circlip 5, receives the punch 6, provided with its brake ring 7, as well as the punch guide in composite material 8, which is fixed by a simple push upwards on the ring 4.