SU1003966A1 - Apparatus for drawing metal sheet with liquid counter pressure - Google Patents

Description

The invention relates to sheet stamping and can be used for drawing products of various shapes.

Closest to the proposed is a device for drawing sheet metal with a counter-pressure of liquid, 5 containing a slider with a punch, mounted with the possibility of axial movement of the matrix with a stepped cavity filled with liquid, and a clamp located on the matrix [1]. ₁₀

However, the known device does not allow to obtain parts of complex configuration (conical, parabolic, etc.), since the back pressure in it can only have a constant value, and to obtain the indicated parts it must be changed during the drawing process.

The purpose of the invention is the expansion of the technological capabilities of the device for drawing with backpressure of the liquid VA by changing the efforts of the back pressure in the drawing process.

This goal is achieved by the fact that the device for drawing sheet metal with a counter-pressure of liquid, containing a slider with a punch, mounted with the possibility of axial movement of the matrix with a stepped cavity filled with liquid, and a clamp located on the matrix, is equipped with at least one rigidly mounted on the slider a hydraulic cylinder with a pressure control unit in it, and the clamp is fixed to the plunger of this hydraulic cylinder.

The drawing shows a device, General view.

The device contains a movable Matrix 1, mounted on the base 2 with the possibility of axial movement, mounted on a slider 3, a punch 4 and hydraulic cylinders 5, on the plungers 6 of which a clamp 7 is suspended. Hydraulic cylinders 5 are equipped with pressure control units 8 in them. The pressure can be adjusted, for example, by means of copiers 9. The hydraulic cylinders are supplied with liquid by a pump station through a check valve 10.

The device operates as follows.

A sheet blank is mounted on the surface of the matrix 1. Then a command is sent to move the slider 3. In this case, the workpiece flange is clamped. With further movement of the slide, the plungers 6, displacing the liquid from the hydraulic cylinders 5, through the pressure plate 7 support the necessary pressure force. After the punch 4 begins to penetrate into the workpiece, the pressure of the liquid in the matrix increases. This pressure, acting on the end face of a smaller stage of the matrix, moves the matrix up to meet the movement of the punch. In this case, the plungers 6 begin to intensively displace the liquid from the hydraulic cylinders 5 through the node 8, which is affected by the copying device 9, changing the pressure of the liquid in the hydraulic cylinders according to the necessary law. Depending on the variable clamping force that impedes the movement of the matrix, there is a change in the back pressure of the liquid in the matrix. After the drawing process is completed, the matrix, clamp and punch return to their original position: the finished part is removed from the device.

Using the proposed device makes it possible to change the back pressure of the liquid in the matrix, which allows the extraction of complex products and thereby expand the technological capabilities of the device.

Claims (1)

5 claims A device for drawing sheet metal with a counter-pressure of liquid, containing a slider with a punch, mounted with the possibility of axial movement of the matrix with a stepped cavity filled with liquid, and a clamp located on the matrix, characterized in that, in order to expand technological capabilities by changing the back pressure the drawing process, it is equipped with at least ¹⁵ hydraulic cylinders rigidly mounted on the slider with a pressure control unit in it, and the clamp is fixed to the plungers of this guide cylinder 20 Sources of information taken into account during the examination 1. USSR copyright certificate No. 660752, cl. B 21 D 22/12, 11.11.77.