Metal working – Method of mechanical manufacture – Shaping by direct application of fluent pressure
Reexamination Certificate
2006-06-13
2006-06-13
Jimenez, Marc (Department: 3726)
Metal working
Method of mechanical manufacture
Shaping by direct application of fluent pressure
C072S058000, C072S061000, C072S062000
Reexamination Certificate
active
07059033
ABSTRACT:
A method of forming a tubular member with thickened ends includes the steps of positioning a tubular member between open die halves and sealing ends of the tubular member. The method also includes the steps of applying at least nominal internal hydraulic pressure to the tubular member and progressively closing the die halves. The method includes the steps of raising the hydraulic pressure substantially within the tubular member to expand and conform the tubular member to the tubular cavity portion. The method further includes the steps of thickening a wall thickness of the axial ends of the tubular member, separating the die halves, and removing the tubular member having thickened axial ends from the die.
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General Motors Corporation
Hargitt Laura C.
Jimenez Marc
Koehler Christopher M.
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