Hydroformed tubular structure and method of making same

Details Hydroformed tubular structure and method of making same Hydroformed tubular structure and method of making same

2005-09-27

2005-09-27

Cozart, Jermie E. (Department: 3726)

Metal working

Method of mechanical manufacture

Shaping by direct application of fluent pressure

C029S505000, C029S507000, C029S283500, C403S282000, C072S054000

Reexamination Certificate

active

06948225

ABSTRACT:
A method and apparatus is provided for strengthening tubular members and attaching components to the tubular member using a hydroforming process. In one embodiment, the outer tube has a non-circular inner surface and the inner tube has an outer surface with a shape different than the non-circular inner surface. In another embodiment, the outer tube has an outer edge with a portion that is not perpendicular to the longitudinal axis of the inner tube. The outer edge prevents relative rotation between the tubes. The inner tube has a higher Young's modulus so that once the high pressure is removed the hydroforming process the inner tube will not contract as much as the outer tube.

REFERENCES:
patent: RE30802 (1981-11-01), Rogers, Jr.
patent: 4759111 (1988-07-01), Cudini
patent: 4761870 (1988-08-01), Urano
patent: 4875270 (1989-10-01), Krips et al.
patent: 6047457 (2000-04-01), Bitto et al.
patent: 6276740 (2001-08-01), Mellor et al.
patent: 6484384 (2002-11-01), Gibson et al.

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