Metal deforming – With means to drive tool – Including pneumatic- or fluid-actuated tool support
Patent
1996-09-13
1998-07-28
Crane, Daniel C.
Metal deforming
With means to drive tool
Including pneumatic- or fluid-actuated tool support
92108, 92110, 92181P, 836391, B21J 912
Patent
active
057849200
ABSTRACT:
A forming die set has one or more independently operated hydraulic actuator 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 actuator assembly includes a compact self contained actuator, in which both a piston and piston rod and a punch retainer are slidable in different sections of a housing bore with supply and return connections both through an end cap of the cylinder housing with a return flow path through a tube extending through the piston. The piston rod extends through an annular rod gland member positioned in the cylinder housing bore, and has an end protruding through to a punch retainer to which it is coupled. The punch retainer is slidable in a section of the cylinder housing bore. 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:
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patent: 3362211 (1968-01-01), Chirco
patent: 3752040 (1973-08-01), Pawloski
patent: 3951025 (1976-04-01), White
patent: 4397175 (1983-08-01), Shear
patent: 4409884 (1983-10-01), Boehringer
patent: 4571975 (1986-02-01), Pawloski
patent: 4791854 (1988-12-01), Banicevic
patent: 5353682 (1994-10-01), Sulprizio
Benefiel John R.
Crane Daniel C.
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