RU2306192C2 - Finish blanking apparatus - Google Patents

Abstract

FIELD: plastic working of metals, possibly precise blanking of parts.

SUBSTANCE: apparatus includes cylinder filled with elastic medium and having supporting plunger whose diameter is less than that of inner cylindrical surface of cylinder; resting upon elastic medium punch and holder that embraces punch with possibility of axial motion relative to it and is mounted with possibility of axial motion relative to cylinder; supporting plunger whose diameter is less than that of punch; counter-punch; die arranged on said inner cylindrical surface of cylinder, rigidly joined with body of cylinder and mounted in such a way that it embraces counter-punch and may perform axial motion relative to it. Counter-punch and supporting plunger are mounted in framework; elastic medium has inner cavity communicated with hydraulic drive.

EFFECT: simplified design of drive system.

1 dwg

Description

The invention relates to the processing of metals by pressure and can be used for accurate cutting of mechanical engineering parts.

Known stamp for finishing cutting, containing a counter-punch installed on the press slider, a cylinder mounted on the press table by means of a support plunger, axially displaced clamp with a punch located in its opening, supported by an elastic medium filling the cavity between the cylinder body , clamp, punch and support plunger, a matrix mounted on the inner side of the upper end of the cylinder [1].

A disadvantage of the known stamp is that the force required to complete the operation is developed by the press.

The invention is aimed at simplifying the drive device.

This is achieved by the fact that the device contains a cylinder filled with elastic medium with a support plunger, the diameter of which is less than the diameter of the inner cylindrical surface of the cylinder, a punch and a clamp resting on the elastic medium, which covers the punch with the possibility of axial movement relative to it and is located with the possibility of axial movement relative to the cylinder, wherein the supporting plunger is made with a diameter smaller than the diameter of the punch, the counter-punch and placed on the said inner cylindrical surface ti cylinder rigidly connected with the cylinder housing matrix installed covering the counter-punch and axially movable relative to the latter, the counter-punch and a plunger mounted on the support frame, and an elastic medium has an inner cavity connected hydraulically.

The drawing shows the device at the initial and final moment of cutting.

The device comprises a cylinder 1 mounted in the frame 2 by means of a support plunger 3. A clamp 4 is mounted inside the cylinder with the possibility of axial relative displacement. A punch 5 is mounted with the possibility of axial relative displacement. The volume of the cylinder between the support plunger, punch, and clamp is filled with an elastic medium 6 with an internal cavity. A matrix 7 is installed on the inner side of the upper end of the cylinder. A counter-punch 8 is mounted on the frame and located in the hole of the matrix with the possibility of axial movement of the matrix relative to the counter-punch. The clamp is spring-loaded relative to the cylinder by springs 9, and the counter-punch - by springs 10, designed to return the stamp to its original position. The internal cavity of the elastic medium is connected to the hydraulic actuator through an axial hole in the support plunger.

The device operates as follows. The workpiece is fed into the groove in the cylinder body 1 on the clamp 4 and the end face of the punch 5.

With increasing pressure in the inner cavity of the elastic medium 6, the clamp 4 and the punch 5 move with the workpiece until it comes in contact with the counter punch 8 and the matrix 7.

A further increase in pressure when the diameter of the support plunger is smaller than the diameter of the punch leads to the matrix moving down relative to the counter punch and to shift the cut product, moreover, under the pressure created in an elastic medium, the product is clamped between the punch and the counter punch, and the clamp presses the workpiece against matrix with a force proportional to the deformation force.

At the end of cutting, under the action of elastic deformation forces of the elastic medium and springs 9 and 10, the device returns to its original position, and the part is pushed out of the matrix.

The source of information

1. Stamp for fair cutting. RF patent No. 2235618.

Claims (1)

A device for finishing cutting, containing a cylinder filled with an elastic medium with a support plunger, the diameter of which is smaller than the diameter of the inner cylindrical surface of the cylinder, a punch and a clamp resting on the elastic medium, which covers the punch with the possibility of axial movement relative to it and located with the possibility of axial movement relative to the cylinder, this supporting plunger is made with a diameter smaller than the diameter of the punch, the counter punch and placed on the said inner cylindrical surface and the cylinder rigidly associated with the housing matrix cylinder mounted covering kontrpuansona and axially movable relative to the latter, characterized in that the support and kontrpuanson plunger mounted on the frame, and the elastic medium has an inner cavity connected hydraulically.