Process for extruding a metal section

B - Operations – Transporting – 21 – C

Patent

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Details

B21C 23/00 (2006.01) B21C 29/04 (2006.01) C22C 1/00 (2006.01)

Patent

CA 2270069

A process is disclosed for extruding a profiled section (40) made at least partially of a metallic material. A preform (36) is extruded in a partially solid or partially liquid state into a section (40) and the extruded section in the partially solid or partially liquid state is guided through a chilling mould (16) in which it solidifies. The corresponding device has an optionally heatable preform chamber (12) for receiving the preforms (36), an optionally heatable moulding chamber (14) which follows the preform chamber and in which the preform (36) is extruded into a profiled section (40), and a chilling mould (16) that follows the moulding chamber (14) and in which the profiled section solidifies. A matrix (18) can be arranged directly after the mould (16) for giving its final shape to the cross section of the profiled section. This process and device enable profiled sections to be produced with areas made of different materials across their cross sections.

Selon ce procédé de fabrication par extrusion d'une barre profilée (40) constituée au moins partiellement d'un matériau métallique, on extrude une préforme (36) dans un état partiellement solide ou partiellement liquide jusqu'à obtenir une barre profilée (40) et on conduit la barre profilée à l'état partiellement solide ou partiellement liquide à travers une coquille refroidie (16) afin de l'amener à se solidifier. Le dispositif correspondant comprend une chambre (12) de réception des préformes (36) le cas échéant chauffable, une chambre (14) d'extrusion des préformes (36) en barres profilées (40) qui est le cas échéant chauffable et suit la chambre de réception des préformes, et une coquille refroidie (16) qui suit la chambre (14) d'extrusion des préformes et dans laquelle les barres profilées se solidifient. Facultativement, une matrice (18) peut être directement située après la coquille (16) pour donner la forme définitive à la section transversale de la barre profilée. Ce procédé et ce dispositif permettent de produire des profilés dont la section transversale a des zones constituées de matériaux différents.

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