Device for regulating the blank-holding force in a press

Details Device for regulating the blank-holding force in a press Device for regulating the blank-holding force in a press

1991-08-28

1995-12-26

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72347, B21D 2408

Patent

active

054777232

ABSTRACT:
Fluidic regulating device intended to be placed between a blank-holder and the sliding member serving to displace the blank-holder. It comprises for example a body (11) intended to be mounted on the abovementioned sliding member (4) in such a way as to be driven by the latter, said body (11) accommodating at least one compact fluidic jack (12) and comprising at least one pipe (13) for feeding a pressurized fluid into the jack or jacks (12), the piston (15) of each jack being attached to a movable member (16) intended to work in conjunction with and displace the blank-holder (3) with respect to said body (11), in such a way that, when the displacement of the abovementioned sliding member is stopped by a stop (18), before the blank-holder (3) has come into contact with a blank placed on or against the die (2), the force exerted by the blank-holder on said blank is determined by the pressure of the fluid injected into said jack (12) and can vary during the stamping cycle.

REFERENCES:
patent: 1619069 (1927-03-01), Glasner et al.
patent: 3948075 (1976-04-01), Finsterwalder et al.
patent: 4316379 (1982-02-01), Anderson
patent: 4745792 (1988-05-01), Story et al.
patent: 4833903 (1989-05-01), de Smet

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