Die cushion device

Details Die cushion device Die cushion device

2005-09-13

2005-09-13

Larson, Lowell A. (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

C072S453130, C267S119000

Reexamination Certificate

active

06941789

ABSTRACT:
After molding is started, a large reaction force is obtained by compressing the air within a lower chamber by a piston while maintained in a sealing state. At an intermediate time of the molding, a small reaction force is obtained by communicating the upper and lower chambers with each other by a switching portion of a spool. At a final time of the molding, a large reaction force is again obtained by interrupting a flow path between the upper and lower chambers. The die cushion ability can be mechanically switched in association with the stroke of the piston, the die cushion device can be set such that no time lag is easily caused at a switching time, and the die cushion ability can be instantly switched.

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