Controlling fluid pressure in a hydroforming process

Details Controlling fluid pressure in a hydroforming process Controlling fluid pressure in a hydroforming process

2008-03-13

2010-11-16

Jones, David B (Department: 3725)

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

C072S060000, C029S421100

Reexamination Certificate

active

07832244

ABSTRACT:
A system for hydroforming a workpiece containing fluid at elevated pressure includes a die in which the workpiece is formed, a source of control pressure, a tank at low pressure, and a valve that includes a displaceable control element that alternately moves between an open state and a closed state, opening and closing, respectively, a passage that hydraulically connects the fluid in the workpiece and the tank in response to the relative magnitudes of a first force applied to the control element by the control pressure source and a second force applied to the control element by pressure of the fluid in the workpiece acting on the control element in opposition to the first force.

REFERENCES:
patent: 4470280 (1984-09-01), Kelly
patent: 4721028 (1988-01-01), Lucas et al.
patent: 6493913 (2002-12-01), Streubel et al.
patent: 6938449 (2005-09-01), Kusunoki et al.
patent: 0633075 (1995-01-01), None

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