Metal deforming – By application of fluent medium – or energy field – Using fixed die
Reexamination Certificate
2007-12-11
2007-12-11
Jones, David B (Department: 3725)
Metal deforming
By application of fluent medium, or energy field
Using fixed die
C072S062000, C072S342940, C072S370060, C072S370220, C072S370240, C029S421100
Reexamination Certificate
active
11554153
ABSTRACT:
A method is provided for forming a tube between a pair of dies. The tube is captured between a pair of dies having die surfaces constructed of an electrically non-conducting material defining a die cavity therein. The ends of the tube are sealed and electrical current is applied to the tube to induce electrical resistance heating of the tube. The interior of the tube is pressurized to expand the tube into the cavity to thereby form the heated tube.
REFERENCES:
patent: 5992197 (1999-11-01), Freeman et al.
patent: 6322645 (2001-11-01), Dykstra et al.
patent: 6613164 (2003-09-01), Dykstra et al.
patent: 7024897 (2006-04-01), Pfaffmann et al.
Wenner Michael L.
Yang Wuhua
GM Global Technology Operations Inc.
Jones David B
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