SU1171170A1 - Apparatus for pressing blanks from low-plasticity materials - Google Patents

Abstract

A DEVICE FOR PRESSING PREPARATIONS FROM LOW-PLASTIC MATERIALS, containing a plate, a container spring-loaded relative to it, placed in it by a drive and installed-. supporting plungers forming a cavity on the slab and a matrix fixed in the container with a frusto-conical seating surface dividing said cavity into working and auxiliary chambers for high pressure fluid, characterized in that, in order to improve the reliability and quality of the obtained products, grooves are made on the landing surface of the mattress, together with the inner surface of the container, channels containing the working and auxiliary chambers are formed.

Description

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This invention relates to pressure treatment of metals.

The aim of the invention is to increase the reliability of the device at work by ensuring product retrieval during the return stroke, as well as reducing the quality of products by applying back pressure during pressing of the workpiece with the same hydrostatic compression both in the working chamber and in the counter pressure chamber.

The drawing shows the device with the workpiece in the initial position (to the left of the axis of symmetry) and at the final moment of pressing (to the right of the axis of symmetry).

The device comprises a container 1 and a deforming tool in the form of a matrix 2 pressed into it with an outer surface in the form of a truncated cone, on which grooves 3 are made. Matrix 2 divides the container cavity into working 4 and auxiliary 5 chambers under high pressure liquid. Together with the inner walls of the container 1, the grooves 3 form channels connecting the chambers 4 and 5 to each other. The drive plunger 6 and the support plunger 7 with a seal 8 enter into the container cavity from opposite sides. The coorie is rigidly mounted on the plate 9. Through the flange of the container 1 and the plate 9, the thrusts 10, on which elastic elements are mounted, for example which container 1 is spring-loaded relative to the plate 9. In addition, in the support plunger 7 there is a cavity coaxial with the matrix 2, in which the thrust inserts 12 are placed.

The device works as follows. .

In the cavity of the container 1 wash down the working fluid. A blank 13 with a chamfer made at its end is placed in the die 2 and the driving plunger 6 is introduced into the cavity of the container. When it moves, the liquid from the working chamber 4 passes through the grooves 3 into the auxiliary chamber 5, lifting the container 1 until the workpiece 13 stops with its upper end into the plunger 6. Upon further movement of the plunger 6, the container 1 is lowered downward, compressing the working fluid in chambers 4 and 5. In defined 702

Because of the increase in power in the auxiliary chamber 5, container G stops, not going up to plate 9. The initial lifting of the container can be adjusted by changing the length of the band.

An increase in pressure in working chamber A causes a corresponding increase in pressure in auxiliary chamber 5, since they are connected by channels 3. This results in an axial force equal to the product of the difference in the end areas of chambers 4 and 5 by the amount of fluid pressure directed to the smaller end area. When the magnitude of the axial force becomes sufficient for plastic deformation of the workpiece, the working fluid and the deformable metal from chamber 4 are forced into chamber 5, moving container 1 upwards ,. towards deformable workpiece. This ensures the hydromechanical pressing of the workpiece with a counterpressure exerted by the liquid on the workpiece in chamber 5, at equal pressures in both chambers. The value of the hydrostatic pressure can be adjusted by changing the diameter of the auxiliary chamber 5. Moving upward, the container 1 compresses the springs 11 ...

At the end of the extrusion of the product, the drive plunger 6 is moved upwards. The pressure in work chamber 4 begins to decrease. At the same time, the container 1 - under the action of compressed springs and its own body moves downward relative to the support plunger 7, equalizing the pressure in the chambers 4 and 5. The end of the pressed product abuts against the insert 12, and upon further movement, the plunger 7 goes down the product matrix and its extraction from the container. The pressure in the chambers 4 and 5 when removing the product eliminates the loss of its stability. The use of inserts 12 of varying thickness and in different quantities allows for the extraction of articles of different lengths.

The device provides the process of hydromechanical pressing with back pressure at equal pressures in the working and auxiliary chambers, i.e. the metal to be pressed is subjected to the same hydrostatic compression as in non-deformed

Claims (1)

DEVICE FOR PRESSING PREPARATIONS FROM SMALL-PLASTIC MATERIALS, containing a plate, a container spring-loaded relative to it, a drive plunger placed therein and mounted on the plate, forming a cavity, and a matrix fixed in the container with a landing surface in the form of a truncated cone separating the indicated cavity on the working and auxiliary chambers under high-pressure liquid, characterized in that, in order to increase the reliability in work and the quality of the products obtained, on the landing surface of the matrix Nena grooves forming together with the inner surface of the channels of the container containing the working and auxiliary chambers. 1171