Method of producing multiple-wall, composite tubular structures

Details Method of producing multiple-wall, composite tubular structures Method of producing multiple-wall, composite tubular structures

B - Operations, Transporting

21

C

154/53.21

B21C 37/06 (2006.01)

Patent

CA 1189777

ABSTRACT In the method of producing a double-wall composite tube by the steps of 1) applying heat to an outer tube, and 2) applying expanding pressure to an inner tube inserted into the outer tube so that the inner tube expands in diameter into tight contact with the outer tube, at least one of the steps 1) and 2) is carried out with respect to a local zone of the tubes which travels progressively from one end to the other of the tubes thereby to cause the outer tube to successively expand locally in the traveling local zone and the inner tube to undergo plastic deformation in expansion to fit tightly against the outer tube, and the expanding pressure acting on the inner tube is thereafter removed, the two tubes being left to attain the ambient temperature, whereby a tight interference fit is obtained therebetween. The heating may be carried out by means of high-frequency induction heating means. The expanding pressure may be applied either hydraulically or mechanically.

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