Pneumatic die cushion equipment

Details Pneumatic die cushion equipment Pneumatic die cushion equipment

1989-10-06

1992-03-31

Graham, Matthew C.

Spring devices

Fluid

Expansible-contractible chamber device

267126, 267130, B21D 2402

Patent

active

051001136

ABSTRACT:
A closed type cylinder unit, instead of the open-to-atmosphere type cylinder unit of conventional equipment forms part of the die cushion apparatus. Based on the principle that the die cushion capability by the closed type cylinder unit is determined by the differential pressure between the lower chamber pressure and the upper chamber pressure, the differential pressure is controlled in such manner that the lower chamber and the upper chamber communicate with each other through a check valve, which is opened when the differential pressure exceeds a preset differential pressure value. As the upper and lower chambers communicate through a shut-off valve, which hinders the excessive increase of the upper chamber pressure when the piston goes up. Further, the form of the check valve is changed for conveniently changing and adjusting the die cushion apparatus during press fabrication.

REFERENCES:
patent: 3593980 (1971-07-01), McHenry
patent: 3807678 (1974-04-01), Karnopp et al.
patent: 3962895 (1976-06-01), Rydell
patent: 4229965 (1980-10-01), Spacek et al.
patent: 4774865 (1988-10-01), Wallis
patent: 4860571 (1989-08-01), Smedberg et al.

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