Hydraulic circuit of a hydromechanical drawing press

Details Hydraulic circuit of a hydromechanical drawing press Hydraulic circuit of a hydromechanical drawing press

1978-03-31

1980-10-28

Gilden, Leon

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

72 20, 267119, B21J 918

Patent

active

042299659

ABSTRACT:
There is disclosed a hydraulic circuit of a press for the hydromechanical drawing of pressings or workpieces in a pressure chamber forming the drawing die which includes at least two spaces for the fluid separated from each other by at least one piston transmitter. At least one of the spaces for the fluid in the pressure chamber separated from the pressure fluid for the forming of the pressing by the piston transmitter is connected by means of a connection branch with a controlled throttle valve with the hydraulic unit of the main working cylinder of the press which drives the drawing punch of the press. To the space for the fluid in the pressure chamber, which is separated by the piston transmitter from the pressure fluid for forming the pressing, is connected a filling branch with a return valve incorporated by means of a hydraulic distributor in the circuit of a hydrogenerator for driving the main working cylinder of the press. The controlled throttle valve is incorporated in a feedback circuit including an auxiliary hydrogenerator as a reference source of pressure fluid for the piston of the controlled throttle valve.

REFERENCES:
patent: 2890669 (1959-06-01), Williamson
patent: 3085530 (1963-04-01), Williamson
patent: 3491565 (1970-01-01), Birman

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