Process of forming tubular member

B - Operations – Transporting – 21 – D

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B21D 51/16 (2006.01) B21D 26/02 (2006.01)

Patent

CA 2463894

A process for forming a tubular member is provided which includes a preforming process for tube-expanding (bulge) forming and bending forming a tubular material (Pa) using first and second molds (M1, M2) and a final forming process for crush forming a preformed tube (Pc) using a third mold (M3) so as to give its cross section a desired shape, the preforming being carried out using the first and second molds (M1, M2) heated at temperatures equal to or higher than the recrystallization temperature of the tubular material and the final forming being carried out using the third mold (M3) heated at temperatures equal to or lower than the recrystallization temperature of the tubular material. The process enables a tubular material of aluminium 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. The process also enables drastic increase in productivity.

Un procédé de formage d'un élément tubulaire comprend un procédé de formage préliminaire destiné à dilater (bomber) et à courber une matière première tubulaire (Pa) au moyen de premier et second moules en métal (M1, M2) et un procédé de formage final destiné à contracter un tube préalablement formé (Pc) en une forme de section transversale spécifiée par un troisième moule métallique (M3), le formage préliminaire étant exécuté par les premier et second moules métalliques (M1, M2) chauffés à la température de recristallisation de la matière première tubulaire ou une température supérieure, et le formage final est exécuté par le troisième moule métallique (M3) chauffé à la température de recristallisation de la matière première tubulaire ou une température inférieure, de manière que l'élément tubulaire de section transversale modifiée ayant des parties de tube dilatées et des parties courbées puisse être constitué, avec précision, d'une matière première tubulaire en alliage d'aluminium avec une qualité élevée, et que sa productivité puisse être améliorée de façon remarquable.

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