Method and apparatus for magnetically stirring a thixotropic...

B - Operations – Transporting – 22 – D

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B22D 27/02 (2006.01) B01F 13/08 (2006.01)

Patent

CA 2410806

A method and apparatus (10) for stirring a molten thixotropic aluminum alloy (11) comprising a first solid particulate phase suspended in a second liquid phase so as to maintain its thixotropic character by degenerating forming dendritic particles into spheroidal particles while simultaneously equilibrating the melt temperature by quickly transferring heat between the melt and its surroundings. The melt is stirred by a magnetomotive force field (30, 32, 34) generated by a stacked stator assembly (12). The stacked stator assembly (12) includes a stator ring (24) adapted to generate a linear/longitudinal magnetic field (34) positioned between two stator rings (20, 22) adapted to generate a rotational magnetic field (30, 32). The stacked stator rings (20, 22, 24) generate a substantially spiral magnetomotive mixing force and define a substantially cylindrical mixing region therein.

L'invention concerne un procédé et un dispositif (10) de brassage d'un alliage d'aluminium thixotrope fondu (11), comprenant une première phase particulaire solide que l'on a placée en suspension dans une seconde phase liquide, ce procédé consistant à conserver le caractère thixotrope de l'alliage en transformant par dégénérescence des particules dendritiques, en particules sphéroïdes, tout en équilibrant simultanément la température de fusion en transférant rapidement la chaleur entre la matière en fusion et l'environnement de celle-ci. La matière en fusion est brassée à l'aide d'un champ de force magnétomotrice (30, 32, 34) produit par un ensemble de stators empilés (12), lequel comprend un stator annulaire (24) conçu pour produire un champ magnétique linéaire/longitudinal (34) et placé entre deux stators annulaires (20, 22) conçus pour produire un champ magnétique rotatoire (30, 32). Les stators annulaires empilés (20, 22, 24) produisent une force de brassage magnétomotrice, sensiblement spiralée et définissent dans cette force une région de mélange sensiblement cylindrique.

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