Actuator-punch assembly with forming die installation

Details Actuator-punch assembly with forming die installation Actuator-punch assembly with forming die installation

1994-04-28

1996-09-17

Crane, Daniel C.

Metal deforming

With cutting

By shearing tool-couple

7245318, 92183, B21D 2824

Patent

active

055557600

ABSTRACT:
A forming die set has one or more independently operated hydraulic punch assemblies mounted directly in one of the die shoes to enable a programmed piercing pattern to be carried out at the time the workpiece is formed. Each punch assembly includes a compact self contained actuator, punch holder, stripper plate and punch retainer, with supply and return connections both made at one end of a cylinder housing with a return flow path through a tube extending through the piston. A purging system using a check valve in the supply line establishes an incremental flow back to the reservoir eliminate air bubbles. An accumulator having a charge volume detector is used to operate the punch assembly actuator.

REFERENCES:
patent: 3077865 (1963-02-01), Hart
patent: 3752040 (1973-08-01), Pawloski
patent: 4409884 (1983-10-01), Boehringer
patent: 4571975 (1986-02-01), Pawloski
patent: 4791854 (1988-12-01), Banicevic
patent: 5353682 (1994-10-01), Sulprizio

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