Method of shaping container bodies and corresponding apparatus

B - Operations – Transporting – 21 – D

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B21D 26/02 (2011.01) B21D 51/26 (2006.01)

Patent

CA 2564010

Said method wherein a) said container (1, 6) is placed in a two halves mould (2) having an internal shaped wall (21), an b) an internal pressure P of a fluid is build up so as to shape said skirt (12), is characterized in that an external pressure P' of a fluid is applied in a said upper space (101) contiguous to an external or upper surface (100) of said open top end (10) and/or in a said lower space (141) contiguous to an external or lower surface (140) of said shaped bottom end (14), so as to have, during said span of time .DELTA.t, a pressure difference .DELTA.P =| P-P'| low enough to prevent any distortion of said shaped open top end (10) and/or said shaped bottom end (14), so as to form a shaped metallic container (1', 6'). An apparatus for carring out the method is also disclosed.

La présente invention se rapporte à un procédé selon lequel (a) un contenant (1, 6) est placé dans deux demi-moules (2) ayant une paroi interne façonnée (21), (b) la pression interne (P) d'un fluide est augmentée jusqu'à façonner ladite jupe (12), ledit procédé se caractérisant en ce qu'une pression externe P' d'un fluide est appliquée dans un espace supérieur (101) contigu à une surface externe ou supérieure (100) d'une extrémité supérieure ouverte (10) et/ou dans un espace inférieur (141) contigu à une surface externe ou inférieure (140) de l'extrémité inférieure façonnée (14), de manière à obtenir, au cours de l'intervalle de temps .DELTA.t, une différence de pression .DELTA.P =|P-P'| suffisamment faible pour empêcher toute déformation de ladite extrémité supérieure ouverte façonnée (10) et/ou de ladite extrémité inférieure façonnée (14), de sorte que puisse être formé un contenant métallique façonné (1', 6'). L'invention se rapporte également à un appareil permettant la mise en oeuvre dudit procédé.

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