Die cushion apparatus for use in a press machine

Details Die cushion apparatus for use in a press machine Die cushion apparatus for use in a press machine

1985-04-26

1987-01-13

Husar, Francis S.

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

72351, 267119, 100259, B21J 918

Patent

active

046354662

ABSTRACT:
In a die cushion apparatus, a die cushion mechanism for achieving a die cushioning capability as relying upon a preset pneumatic pressure is provided with a hydraulic pressure chamber into which a piston connected to a die cushion pad is fitted, the hydraulic pressure chamber is provided with a hydraulic pressure feed circuit and an exhaust circuit, a relief valve whose relief pressure is controllable is disposed in the exhaust circuit, and relief pressure control means is coupled to the relief valve.

REFERENCES:
patent: 2842357 (1958-07-01), Williamson
patent: 3456478 (1969-07-01), Alexander

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