Press assembly

Details Press assembly Press assembly

1998-06-16

1999-10-19

Hail, III, Joseph J.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

7245313, 72 199, B21D 2200

Patent

active

059669810

ABSTRACT:
A press assembly includes first and second members which engage opposite sides of a workpiece during operation of the press assembly. A cushion assembly is provided to absorb force transmitted from at least one of the members during operation of the press assembly. A high pressure reservoir is connected in fluid communication with a cylinder of the cushion assembly to receive fluid during operation of the press assembly. Hydraulic fluid is supplied to the cushion assembly at a relatively low pressure during operation of the press assembly. A valve is operable to block a flow of hydraulic fluid from the cushion assembly as the press assembly begins to operate from a closed condition toward an open condition to thereby retain the cushion assembly in a retracted condition. A secondary or pump cylinder may be actuated by operation of the press assembly to pump hydraulic fluid to the cushion assembly. A modulating valve is operable to modulate the fluid pressure conducted from the pump cylinder assembly to the cushion cylinder assembly during operation of the press assembly.

REFERENCES:
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patent: 4635466 (1987-01-01), Seki et al.
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patent: 5099673 (1992-03-01), Baur
patent: 5687598 (1997-11-01), Kirii et al.
Article entitled "Advances and Trends in Sheet Metal Forming Processes",#970436, Klaus Siegert, University of Stuttgart, Copyright 1997 Society of Automotive Engineers, Inc., pp. 23 through 38.
Article entitled "Force-Stroke-Curve of Gas Springs",#970982, K. Siegert and J. Hohnhaus, University of Stuttgart, Copyright 1997 Society of Automotive Engineers, Inc., pp. 195 through 201.
Article entitled "The Die-Draulic Basic Unit", published prior to May 1, 1998.

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