Process for press forming metal tubes

B - Operations – Transporting – 23 – P

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B23P 11/00 (2006.01)

Patent

CA 2526929

Sub-blanks (22, 24, 26) having different thicknesses and/or different materials are joined together along a joint line or boundary line (28, 30). The joint line can have an axial directional component and/or a radial directional component. The blank is formed into a U-shaped structure (120) with two substantially parallel arms (121, 123) and the arms can be overbent toward each other by a distance that varies along the axial length of the U- shaped member. The U-shaped member can be subjected to a press forming operation to form a substantially tubular member 220. The substantially tubular member can have a non-circular cross-sectional shape. A step can be formed at the joint line as a result of different thickness sub-blanks. The step is placed in a press forming die facing outwardly so that the step is reduced during the press forming operation.

La présente invention a trait à des flans secondaires d'épaisseurs différentes et/ou de matériaux différents assemblés le long d'une ligne de joint ou ligne de limite. La ligne de joint peut comporter une composante directionnelle axiale et/ou une composante directionnelle radiale. Le flan est formé en une structure en U avec deux branches sensiblement parallèles et les branches peuvent être recourbées en rapprochement l'une de l'autre d'une distance qui varie selon la longueur axiale de l'organe en U. L'organe en U peut être soumis à une opération de formation sous pression pour former un organe sensiblement tubulaire. L'organe sensiblement tubulaire peut présenter une forme de section transversale non circulaire. Un gradin peut être formé au niveau de la ligne de joint grâce aux épaisseurs différentes des flans secondaires. Le gradin est placé dans une matrice de formation sous pression tourné vers l'extérieur de sorte que le gradin est réduit lors de l'opération de formation sous pression.

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