SU733832A1 - Apparatus for hydrostatically extruding and upsetting with counterpressure - Google Patents

Description

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The device relates to the field of metal forming, in particular to hydrostatic pressing of metals with counter pressure.

Devices for hydrostatic pressing are known in which a counter-pressure is applied to the extruded product, which increases the plastic properties of the metal to be pressed 1.

The disadvantage of these devices is the impossibility of obtaining products of variable cross section.

The closest technical solution known is a device for hydrostatic pressing and unloading with backpressure, which contains a container with a working chamber mounted on a support, a punch that enters it and a backpressure shaping chamber. The back pressure in the known device is created by compressing the plastic medium 2 pressed out from the matrix.

The disadvantage of this device is the low productivity associated with the disassembly of the device for removing the product from it after pressing and heading out and then filling the matrix with a plastic medium.

The aim of the invention is to provide such a device for hydrostatic pressing and unloading with back pressure, which would ensure high performance and reliability.

The goal is achieved by the fact that the device for

10 hydrostatic pressing and landing with backpressure is equipped with a multiplier mounted on a support, the working cavity. which is connected by a channel to a backpressure chamber, and has a volume

15 a larger volume of the latter, while the support is installed with the possibility of limited reciprocating movement in the direction perpendicular to the direction of pressing, and the seal is placed between the container and the support.

Claims (2)

The drawing shows a device for hydrostatic pressing and unloading prior to deformation. 37 The container 1 has a working chamber 2 and a backpressure chamber 3, which is a shaping chamber. Chambers 2 and 3 are separated by a matrix 4. A punch 5 is placed in the upper part of chamber 2. Container 1 on springs 6 is mounted on housing 7 that serves as a guide for support 8. The top surface of support 8 is fitted with a seal 9. Support 8 has a hole 10 and a multiplier 11 with a low-pressure porous cavity 12 and a high-pressure piston cavity 13 connected to counter pressure chambers 01T 3 by channel 14. The volume of high pressure cavity 13 is greater than the volume of the back pressure chamber 3. The low pressure cavity 12 is in communication with the injection line 15 by the check valve 16, and with the discharge line 17 by the control valve 18 and the safety valve 19. Support 8 includes a hydraulic cylinder 20 of reciprocating movement of the support 8, the stem 21 of which is rigidly fixed on the plate 22. The cavity of the hydraulic cylinder 20 connected to the injection line 15 and to the discharge line 17 through the control valve 23. Before pressing, the punch 5 is removed from the container 1. The support 8 is in the leftmost position and the piston of the multiplier 11 is in the rightmost one. The container 1 is pressed from the support 8 under the action of the springs 6. The valve 18 is turned off, and the valve 23 is set to the on position. The deformable billet 24 with the prepared lead chamfer is installed into the matrix 4. The working chamber 2 and the high-pressure multiplex cavity 13 are filled with liquid and the punch 5 is inserted. transferring force to the container 1. Under the action of this force, the container moves downward until it comes into contact with the support 8. With the SLM, the backpressure chamber 3 is closed and is sealed by a seal 9. For The distribution valve 1B is then set to the on position and the pressure is transferred through the non-return valve 16 to the low pressure piston cavity 12, thus moving the piston of the multiplier 11 to the extreme left position, while the liquid from the high pressure cavity 13 flows through the channel 14 into the backpressure chamber 3. Upon further movement of the punch 5, the workpiece is pressed through the point of the matrix 4, filling the forming chamber 3 of the counter-pressure. The liquid expelled from chamber 3 moves the piston of the multiplier 11 to the right. At the same time, the pressure in chamber 3 remains constant, depending on the oi of the setting of the safety valve 4, 19, communicated with the low pressure cavity 12 of the multiplier through the control valve 18, which is in the on position. A check valve 16 blocks the discharge of liquid into the discharge line 15. Thus, the high-pressure cavity 13 of the multiplier serves as a condensation chamber, which absorbs the liquid displaced by the preform 24. After the head of the workpiece 24 is disembarked into the shaping chamber 3, the punch 5 is stopped and the control valve 18 is set to the off position, the pressure in the cavity 12 is relieved and the piston of the multiplier 11 undergoes the extreme right pressure to maintain the required volume of liquid. cycle in the chamber 13, since its volume is larger than the volume of the backpressure chamber 3. Then the punch 5 is moved upwards. The pressure in the working chamber 2 drops and the springs 6 press the container 1 out of the support 8 with the seal 9. Switching the distribution valve 23 to the off position, pressurizes the rod cavity of the hydraulic cylinder 20, while the support 8 moves to the extreme right, the hole 10 is set opposite the forming, reforming zone to the ejection position. The punch 5 is re-lowered, while the pressure in chamber 2 rises, container 1 lowers until it touches the support, and further pressure T1 produces pushing the workpiece 24, then pressing it through the die 4 point. Using the proposed device for hydrostatic pressing and countering with counterpressure allows a threefold increase in productivity by eliminating the need for disassembling the device to remove the finished part after the end of the cycle. Apparatus of the Invention A device for hydrostatic pressovININ and backpressure disembarkation, comprising a spring-loaded container with a working chamber and a seal mounted on a support, a punch that enters it, and a counterpressure shaping chamber that is different from. in order to improve performance and reliability of work, it is equipped with a multiplier mounted on a support, the working cavity of which is connected by a channel with a shaping backpressure chamber, and has a larger volume of the latter, while the support is installed with the possibility of limited reciprocating towards perpen57338326 diculi romi pressing direction, and comp. USSR Author's Certificate N "314571 The position is located between the connector and the support. cl. B 2 C 25/10, 1971. ,,, 2. Mechanical properties of materials under Poin you t ™ of information, “,, some kind of pressure. Issue 2, edited taken into account in the examination5 X. L. Pugh, M .. Mir, 1973, p. 199-206. FIG. 18.