Production of a component for reducing the effects of an...

F - Mech Eng,Light,Heat,Weapons – 16 – F

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F16F 7/12 (2006.01) B60R 19/34 (2006.01) B62D 21/15 (2006.01) B21D 26/02 (2006.01)

Patent

CA 2310705

Process for producing a component for reducing the effect of an external mechanical impact, of the type which comprises an essentially tubular metal element which has a jump in its cross section which is such that under the influence of an axial load it can be fumed at least partially inside-out as a result of plastic deformation, by means of which process the tubular element is formed by hydroforming from a piece of tube which has a cross section which is constant along its length, during which process part of the length of the cross section is increased in size, and the transitions in the cross section cover a short distance, and during the hydroforming an axial pressure on the piece of tube which is being deformed is set to be such that the transitions in cross section adapt to an S-shape.

Procédé de production d'une pièce destinée à réduire l'effet d'un impact mécanique externe, du type qui comporte un élément métallique essentiellement tubulaire doté sur sa section transversale d'un renflement tel que sous l'influence d'une charge axiale, ledit renflement peut être retourné au moins partiellement à la suite de la déformation plastique. Selon ledit procédé, l'élément tubulaire est formé par hydroformage d'un morceau de tube à section constante sur sa longueur. La taille d'une partie de la longueur de la section transversale est augmentée et les transitions entre les sections transversales sont courtes. Pendant l'hydroformage, une pression axiale est exercée sur le tronçon de tube à déformer de manière telle que les transitions entre les sections adoptent une forme de S.

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