FR2625694A1 - Punching control device - Google Patents

Abstract

Punching control device for a press, including a lower tool support 1, a means 2 for positioning the workpiece 3 to be punched, fixed to the said support, an upper tool part 5 rigidly connected to the ram (slide) 6 of the press and a device 4 for pressing the workpiece to be punched on the positioning means 2, characterised in that the punching device 10 is mounted on the lower tool support 1 and carries at least one punch 11 mounted so as to move in a direction XX' under the action of a pressing means 135 integral with an articulated return lever 13 subjected to a vertical control force communicated via the upper tool part 5.

Description

PUNCHING CONTROL DEVICE
The invention relates to a punching device used for drilling holes in response to a control force transmitted by the slide of a press.

The invention relates more particularly to a corner punch tool mowing on a press of the type comprising a lower frame of tool, a trojan for positioning the punching piece to be fixed, fixed on said frame, an upper part of a rigidifying tool connected to the press slide and a device for pressing the workpiece to be punched on the positioning means.

The publication FR-A-2160342 describes a punching device constituted by a set of tools carried by a frame fixed to the slide and, at its lower part, a mechanical assembly carried by another frame intended to pass the piece with a tapered point next to these tools.

Such a device requires frequent interventions on the moving parts of the press, particularly during tool changes and adjustments which lead to prolonged disarming of the press.

A first object of the invention is an improved punching control device which is more effective and more satisfactory, of more extensive applications and care which is exposed to malfunctions than the previous ones.

A second object of the invention is a gas spring punching tool which allows an amplified stroke of the punch under the action of a control trojan with a reduced displacement stroke and of reducing the dimensions of the tool.

Another object of the invention is a spring punching tool in which the vertical control movement of the tool is transformed into a directed movement of the punch in a different direction of punching.

According to the invention, the punching control device is mounted on the lower tool frame and carries at least one punch punch mounted displacement in a direction XX 'under the action of a pressing means secured to a return lever articulated subject to a vertical control force communicated by the upper part of the tool. In the preferred implementation of the invention, the transmission of the punch return force is transmitted by a spring rod in working support on a fixed stop relative to the movable punch.

The invention will be better understood with reference to the following description and the appended drawings in which - FIG. 1 is an overall view of the punching device fitted to a slide press, - FIG. 2 is a view in longitudinal section of the punching tool.

With reference to the drawings, the punching control device is associated with a press, the main members of which have been shown necessary for understanding the invention.

A lower tool frame 1 comprises a fixing plate for a punching device 10. The b ti 1 carries a centering device 2 of the part 3 which must receive the perforations under the action of the device 10. For this purpose, the part 3 is held in the clamping position on the centering device 2 by a pressing element 4. The latter is mounted relative mobility with respect to the upper part 5 rigidly connected to the slide 6 of the press. Springs 7 mounted in compression between the upper part 5 and the pressing element 4 give the latter the clamping force necessary for immobilizing the part 3 during the punching operation under the action of the vertical downward movement of the slide 6 and of the element 5 .

According to the invention, the device 10 carries at least one punch 11 mounts in displacement along an axis XX 'under the action of a pressure roller secured to a return lever 13, articulated around an axis 12 on the body 14 of the device. To this end, the lever 13 itself consists of an articulated yoke 131 carrying a first and a second axis 132, 133 of rotation of rollers 134, 135 whose roller 135 exerts a pressure force on a slide 16.

The body 14 has an axial bore 15 in which the cylindrical slide 16 is mounted to move along the axis XX ′, the front face of which carries holes for receiving pins 17 for positioning and screws 18 for fixing the punch 11. The slide 16 also has a flat 19 on which an anti-friction pad 20 immobilized in a housing of the body 14 rests.

The slide 16 has, moreover, an internal housing 21 for receiving a spring 22 arranged coaxially with the punch 11. The spring 22 is mounted in tension between a plate 23 for closing the housing 21 and is supported on a stop 24 fixed, saterialized by an axis & flat disposed in a transverse bore of the body 14.

By way of example, a gas spring will be applied as described in publication FR-A-2582368 which comprises a push rod 25 bearing on the stop 24.

The operation of the device will be explained with reference to the drawing.

The punching device 10 previously positioned and fixed on the frame 1 is subjected to a vertical control force exerted by all of the elements 5, 6 of the press on the roller 134. Under the action of the force, the lever 13 rocks around the axis 12 and transmits a substantially horizontal thrust force to the plate 23. The force applied to the plate 23 is transmitted to the slide 16 and to the punch 11 which moves to a working position in contact with the piece 3. The push rod 25, bearing on the fixed stop 24, sinks into the body of the spring 22 and the roller 135 comes to occupy a position 135 '.

 When the elements 4, 5, 6 of the press rise, the roller 134 is discharged and the expansion of the gases of the spring 22 exerts a thrust force on the back of the plate 23 which causes, in its recoil stroke, the slide 16 and the punch 11.

Claims (3)

1. Punching control device for a press comprising a lower tool Mti (1), a means (2) for positioning the workpiece (3) Ci punching, fixed on said frame, an upper tool part (5) rigidly connected to the slide (6) of the press and a pressing device (4) for the workpiece punching on the positioning means (2), characterized in that the punching device (10) is mounted on the b & i fl ) lower tool and carries at least one punch (11) mounted to move in a direction XX 'under the action of a pressing means (135) secured to an articulated return lever (131 subjected to a control force vertical communicated by the upper part (5) of the tool. 2. Punching control device of the type comprising a body (la) secured to the bats, a slide (16) mounted mobility in said body, a pressing means (135) secured to a return lever (13) carried by said body and articulated around an axis (12) and a spring (22) is arranged in the slide (16) coaxially with the punch (11), characterized in that the transmission of the force for controlling the punch (11) is transmitted by the slide (16) against the opposing force of a spring (22) bearing on a stop (24) fixed to the body (14), said spring exerting a restoring force on the punch (11) by following the removal of the control force on the return lever (13).  3. Device according to claim 2, characterized in that the return lever carries at each of its ends a roller (134, 135) one of which is in axial working support on a thrust plate (23) and compression control of a gas spring (22), the trigger of which generates the backward movement of the slide (16) and of the punch (11).