Metal deforming – With means to drive tool – Including pneumatic- or fluid-actuated tool support
Patent
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
Kosek Jiri
Spacek Jindrich
Gilden Leon
Vyzkumny ustav tvarecich stroju a technologie
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