Process for forming tubular member

Details Process for forming tubular member Process for forming tubular member

2002-10-23

2008-12-16

Jones, David B (Department: 3725)

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

C072S062000, C072S370220, C072S342700, C072S342800, C072S342940, C072S342960, C029S421100

Reexamination Certificate

active

07464572

ABSTRACT:
A process for forming a tubular member is provided which includes a pre-forming process for tube-expanding (bulge) forming and bending forming a tubular material using first and second molds and a final forming process for crush forming a preformed tube using a third mold so as to give its cross section a desired shape, the pre-forming step being carried out using the first and second molds heated at temperatures equal to or higher than the recrystallization temperature of the tubular material and the final forming step being carried out using the third mold heated at temperatures equal to or lower than the recrystallization temperature of the tubular material. The process enables a tubular material of aluminum alloy to be formed into a tubular member of high precision and high quality which has expanded portions as well as bent portions and whose cross section varies across its length.

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