Die cushion apparatus

Details Die cushion apparatus Die cushion apparatus

2008-07-22

2008-07-22

Banks, Derris H. (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

C072S453130

Reexamination Certificate

active

07401488

ABSTRACT:
A cylinder is formed in the lower portion of a cushion pad, and a piston coupled to an upper end of a rod is slidably contained in the cylinder. The rod is coupled to a rotary shaft of a servomotor. An oil pressure chamber is formed of an inner wall surface of the cylinder and a wall surface of the piston. The axial center of the oil pressure chamber is identical with the axial center of the rod. The pressure oil for alleviating an impact is filled in the oil pressure chamber. The pressure oil filled in the oil pressure chamber absorbs a force operating instantaneously at the cushion pad. According to this structure, the impact generated in a press machine can be alleviated.

REFERENCES:
patent: 3914978 (1975-10-01), Sekanina et al.
patent: 4033252 (1977-07-01), Baker
patent: 5299444 (1994-04-01), Kirii et al.
patent: 5435166 (1995-07-01), Sunada
patent: 6085520 (2000-07-01), Kohno

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