Method and apparatus for performing secondary operations in a pr

Details Method and apparatus for performing secondary operations in a pr Method and apparatus for performing secondary operations in a pr

1990-09-07

1991-08-13

Jones, David

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

724531, 7245311, 72435, 72472, B21J 724, B21J 728

Patent

active

050385984

ABSTRACT:
A method and apparatus for conducting a secondary operation on a workpiece such as punching or flanging, after a primary forming operation has been completed while the workpiece is still in the press. The secondary operation is performed by discharging a volume of hydraulic fluid to a working cylinder at a selectively controlled point in the press cycle, the hydraulic fluid pressurized by compression of a volume of gas by the press during the primary operation, and thereafter released by a solenoid valve at the time the secondary operation is to be performed. A discharge cylinder is mounted to one of the dies and is engaged to cause the hydraulic fluid to be pressurized by compression of the gas during the downstroke of the press.

REFERENCES:
patent: 3707866 (1973-01-01), Brauer
patent: 4321818 (1982-03-01), Bessho

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