Screw extruder for continuous extrusion of materials with...

B - Operations – Transporting – 21 – C

Patent

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Details

B21C 23/21 (2006.01) B30B 11/24 (2006.01)

Patent

CA 2670110

Screw extruder for the continuous extrusion of materials with high viscosity, in particular metals such as aluminium and its alloys. The extruder includes an Archimedes screw (1 ) rotationally provided within liner (2) of a screw housing (4) with an inlet (11 ) for the feeding of the material to be extruded, a compacting or extrusion chamber (5) and an extrusion die assembly with a die (6) which forms the shape of the desired extruded product (7). The design of the screw (1 ) and liner (2) is such that the required compaction takes place at the down-stream end of the screw towards the extrusion chamber (5) corresponding to up to 540° of the rotation of the screw, or up to 1,5 turn of the screw flight length, and that the solid plug of metal thus formed at the end of the screw and extrusion chamber (5) is restricted from rigid rotation to obtain the required compaction and extrusion pressure.

L'invention concerne une extrudeuse à vis destinée à l'extrusion en continu de matériaux à viscosité élevée, en particulier de métaux tels que l'aluminium et ses alliages. L'extrudeuse inclut une vis d'Archimède (1) qui est fournie, de manière à être rotative, à l'intérieur d'un revêtement (2) d'un logement de vis (4) avec une admission (11) destinée à l'alimentation du matériau qui doit être extrudé, une chambre de compactage ou chambre d'extrusion (5) et un ensemble matrice à extrusion avec une matrice (6) qui donne la forme du produit extrudé souhaité (7). Le design de la vis (1 ) et du revêtement interne (2) est tel que le compactage requis a lieu au niveau de l'extrémité aval de la vis vers la chambre d'extrusion (5), correspondant à une rotation de la vis allant jusqu'à 540°, ou jusqu'à 1,5 fois la longueur du filet, et que le tampon solide de métal ainsi formé à l'extrémité de la vis et de la chambre d'extrusion (5) ne peut pas tourner de façon rigide afin d'obtenir le compactage requis et la pression d'extrusion.

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