Multi-stage dual wall hydroforming

Details Multi-stage dual wall hydroforming Multi-stage dual wall hydroforming

1993-05-20

1994-11-15

Vo, Peter Dungba

Metal working

Method of mechanical manufacture

Assembling or joining

29 33D, 294551, 29507, 29DIG43, 72 58, 72 62, 72367, 138114, 138148, B21D 3908, B21D 300, B23P 1102, F16L 918

Patent

active

053635442

ABSTRACT:
A method of forming a dual tube conduit having a predetermined outer tube dimension, a predetermined inner tube dimension, and a predetermined gap between the tubes. A dual tube workpiece may be initially bent in one or more zones to a desired nonlinear configuration, the inner and outer tubes are hydroform expanded simultaneously to obtain the selected inner tube dimension, and the outer tube is then hydroform expanded to the desired outer tube dimension and to the desired gap therebetween, while the inner tube is held constant.

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