Method and apparatus for hydroforming metallic tube

Details Method and apparatus for hydroforming metallic tube Method and apparatus for hydroforming metallic tube

B - Operations, Transporting

21

D

B21D 19/00 (2006.01) B21D 26/02 (2006.01)

Patent

CA 2235853

A method and apparatus for hydroforming a metallic tube including the steps of: preliminarily expanding the metallic tube over an axial section longer than the length of the expanded portion of a final product as measured in the axial direction of the metallic tube; and compressing the preliminarily expanded portion in the axial direction of the metallic tube so as to form the shape of the expanded portion of the final product. According to the method and apparatus of the invention, frictional resistance between the metallic tube and processing tools can be reduced, and moreover, the internal pressure within the metallic tube can be reduced during expansion processing. Furthermore, the cost for the manufacture of metallic die is reduced, and in addition, yield is improved.

Méthode et dispositif permettant de fabriquer par hydroformage un tube de métal. La méthode comprend les étapes suivantes : au préalable, mandriner le tube de métal sur une section axiale plus longue que la longueur de la partie mandrinée d'un produit fini mesurée dans le sens axial du tube de métal; comprimer la partie préalablement mandrinée dans le sens axial du tube pour obtenir la forme de la partie mandrinée du produit fini. Grâce à l'utilisation de la méthode et du dispositif propres à l'invention, la résistance de frottement entre le tube de métal et les outils du procédé peut être réduite, et la pression interne dans le tube de métal peut aussi être diminuée pendant l'opération de mandrinage. En outre, le coût de fabrication de la matrice de métal est réduit, et, autre avantage, le rendement est accrû.

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