Improved method for hydroforming an aluminum tubular blank

B - Operations – Transporting – 21 – D

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B21D 26/02 (2006.01) C22F 1/04 (2006.01)

Patent

CA 2388263

A method of hydroforming a tubular aluminum alloy blank (T) into a desired configuration, including providing a tubular blank having opposing longitudinal end portions; rapidly heating the blank to an elevated temperature for a brief period of time, the values of the elevated temperature and the brief period of time being selected such that, after the rapid heating, the blank has a reduced hardness below an initial hardness without otherwise significantly changing the microstructure of the blank; quencing the blank while the blank is at or near the elevated temperature; disposing the quenched blank in a die cavity of a hydroforming die (102, 104), the hydroforming die having interior surfaces (106, 108) that provide the die cavity with a shape corresponding to the desired configuration of the tubular blank; sealing the opposing longitudinal end portions of the tubular blank; supplying pressurized fluid to the hollow interior of the tubular blank and relatively forcing the opposing end portions of the tubular blank inwardly toward one another such that the pressurized fluid diametrically expands the temporarily softened portions of the tubular blank such that the temporarily softened aluminum alloy of the blank is caused to flow longitudinally along the blank.

L'invention porte sur un procédé d'hydroformage d'une ébauche tubulaire (T) d'alliage d'aluminium pour lui donner la configuration désirée en partant d'une ébauche tubulaire présentant deux extrémités longitudinales opposées, et comportant les étapes suivantes: chauffage rapide de l'ébauche à une température élevée pendant une brève période, les paramètres de température et de temps étant choisis pour qu'après ce chauffage la dureté de l'ébauche soit ramenée en deçà de sa dureté initiale, sans pour autant modifier sensiblement sa microstructure; trempe de l'ébauche alors qu'elle est à la température élevée ou à une température voisine; pose de l'ébauche trempée dans la cavité d'une matrice (102, 104) d'hydroformage dont les surfaces intérieures ont une forme correspondant à la configuration définitive souhaitée de l'ébauche; obturation des extrémités longitudinales opposées de l'ébauche; alimentation en fluide sous pression de l'intérieur creux de l'ébauche; et forçage vers l'intérieur des extrémités opposées de l'ébauche pour que le fluide dilate les parties temporairement amollies de l'ébauche et que l'alliage de ces parties flue longitudinalement le long de l'ébauche.

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