B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 51/14 (2006.01) B21D 51/18 (2006.01) B21D 51/26 (2006.01) B21D 26/02 (2006.01)
Patent
CA 2353855
The invention relates to method for producing a hollow body (26) from sheet metal, especially from aluminum or aluminum alloys. According to the inventive method, a substantially flat sheet metal blank (4) is provided. At least one wall intermediate element (8) which is produced as one piece with the sheet metal blank (4) is folded and/or bent into several substantially superimposed layers. Marginal areas (16, 18) of the sheet metal blank (4) are placed closely side by side, preferably they are placed on top of one another in such a manner that they overlap to some degree, and they are connected to one another. The sheet metal blank (4) and the folded wall intermediate element (8) are subjected to a hydraulic or pneumatic internal high pressure so that the folded wall intermediate element (8) is freely unfolded to form the hollow body (26). The invention also relates to a hollow body (26) produced by said method and to an intermediate product (2) which can be used to produce such a hollow body (26) according to the inventive method.
L'invention concerne un procédé permettant de produire un corps creux (26) en tôle, notamment en aluminium ou en alliages d'aluminium. On effectue dans un premier temps une découpe (4) sensiblement plate dans une tôle, puis on plie et/ou cintre au moins un élément intermédiaire faisant office de paroi (8), formé d'un seul tenant avec la découpe (4), en plusieurs couches sensiblement superposées. Des zones marginales (16, 18) de la découpe (4) sont ensuite juxtaposées, superposées avec un certain chevauchement, et sont solidarisées. La découpe (4) et l'élément intermédiaire faisant office de paroi (8) pliée sont finalement soumis à l'action d'un pression intérieure hydraulique ou pneumatique élevée, de manière que l'élément intermédiaire (8) plié soit déplié librement pour former le corps creux (26). L'invention concerne en outre un corps creux (26) obtenu à l'aide dudit procédé et un produit intermédiaire (2) pouvant s'utiliser pour produire un corps creux (26) de ce type, d'après ledit procédé.
Alcan International Limited
Kirby Eades Gale Baker
LandOfFree
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