Stretch shaping method and apparatus

B - Operations – Transporting – 21 – D

Patent

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Details

153/16, 113/58

B21D 25/00 (2006.01) B21D 3/12 (2006.01) B21D 39/08 (2006.01)

Patent

CA 2039705

A method for stretch shaping an elongated metallic extrusion is disclosed comprising the steps of applying axial tension to an elongated metallic extrusion in an amount sufficient to equal or exceed the yield strength of the extrusion. An external shaping die is applied against a perimetric portion of the outside surface of the extrusion. The die has working faces conforming substantially to a finished cross-sectional shape for the extrusion. While maintaining such tension the die is advanced along a length of the extrusion. An apparatus for stretch shaping an elongated metallic extrusion is also disclosed.

On décrit un procédé de moulage par étirage d'une extrusion métallique allongée (10), lequel procédé consiste à appliquer une tension axiale à une extrusion métallique allongée (10) en quantité suffisante pour égaler ou dépasser la résistance à la déformation de l'extrusion. Une filière (60) externe est mise en contact avec une portion du périmètre de la surface externe de l'extrusion (10). La filière possède des surfaces de travail qui se conforment sensiblement à une forme en coupe transversale de l'extrusion (10) achevée. Tout en gardant une telle tension, la filière (60) avance sur une longueur de l'extrusion (10). On décrit également un appareil destiné à mouler par étirage une extrusion (10) métallique allongée.

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