Method of pressure-ram-forming metal containers and the like

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 22/16 (2006.01) B21D 51/16 (2006.01) B21D 51/26 (2006.01) B21D 26/02 (2006.01)

Patent

CA 2445582

A method of forming a bottle-shaped or other contoured metal container by subjecting a hollow metal preform having a closed end to internal fluid pressure to cause the preform to expand against the wall of a die cavity (10) defining the desired shape, and advancing a punch (12) into the die cavity (10) to displace and deform the closed end of the preform either before or after expansion begins but before it is complete. The pressure-subjecting step is performed by simultaneously subjecting the preform in the die cavity to independently controllable internal and external positive fluid pressures and varying the difference between them to control strain rate.

L'invention concerne un procédé pour former un contenant métallique en forme de bouteille ou d'une autre forme, ce procédé consistant à soumettre une préforme métallique creuse comportant une extrémité fermée à une pression hydraulique interne pour provoquer une expansion de la préforme contre la paroi d'une cavité de matrice (10) définissant la forme voulue et à introduire un poinçon (12) dans la cavité de matrice (10) pour déplacer et déformer l'extrémité fermée de la préforme, avant ou après le début de l'expansion, mais avant la fin de l'expansion. Lors de l'étape d'application de pression, la préforme est soumise dans la cavité de matrice simultanément à des pressions hydrauliques positives interne et externe régulables indépendamment, la différence entre la pression interne et la pression externe étant modifiée pour réguler le taux de déformation.

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