Process for producing hollow member

Details Process for producing hollow member Process for producing hollow member

B - Operations, Transporting

21

C

B21C 37/16 (2006.01) B21D 51/16 (2006.01) B21D 53/88 (2006.01) B21K 1/12 (2006.01) B21D 26/02 (2006.01)

Patent

CA 2461208

A process is provided for producing a hollow member having a wall thickness, in a cross section orthogonal to the longitudinal direction, that varies in the longitudinal direction, the process including a heating step of heating a tubular material (Pa) so that the tubular material (Pa) is given a temperature variation in the longitudinal direction, and a stretching step of axially stretching the tubular material (Pa) that has been heated in the preceding step. In this way, a hollow member having a cross-sectional wall thickness that is variable in the longitudinal direction can be easily produced.

L'invention concerne un procédé de fabrication d'un élément creux présentant une épaisseur de plaque variable dans le sens longitudinal dans la section transversale perpendiculaire au sens longitudinal dudit élément creux. Ledit procédé est caractérisé en ce qu'il comprend: une étape de chauffage permettant de chauffer un matériau tubulaire (Pa) avec une différence de température présente dans le sens longitudinal; et une étape de tirage permettant de tirer le matériau tubulaire (Pa) chauffé au cours de l'étape précédente dans le sens axial, ce qui permet à l'élément creux présentant une épaisseur de plaque dans la section transversale variable dans le sens longitudinal d'être fabriqué facilement.

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