Semi-solid casting apparatus and method

B - Operations – Transporting – 22 – D

Patent

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Details

B22D 17/08 (2006.01) B22D 1/00 (2006.01) B22D 17/00 (2006.01) B22D 17/10 (2006.01) B22D 17/30 (2006.01)

Patent

CA 2338004

A die casting system includes a vessel (12) defining a reservoir (30) with a controlled heater (22) and an agitator (14) for maintaining the bath (16) of semi-solid metal (34) in a homogenous isothermal state, a transfer system (107) capable of transferring a known quantity (122) of metal in its semi- solid state to a mold cavity in a die casting machine, the transfer system (107) including a heated suction tube (108), a vacuum source for vacuum ladling semi-solid metal (34) from the bath (16) to a die, and a plunger tip (132) providing a path for free air flow to allow evacuation of the suction tube (108) during casting and a metal replacement system for replacing the known quantity (122) of transferred metal with a similar amount (126) of liquid metal (32) so that a stable homogenous isothermal bath (16) of semi- solid metal (34) is controllably maintained to be available for die casting operations.

La présente invention concerne un système de moulage sous pression comprenant une cuve (12) formant un réservoir (30) avec un élément chauffant à commande (22) et un agitateur (14) permettant de maintenir le bain (16) de métal semi-solide (34) dans un état isotherme homogène, un système de transfert (107) capable de transférer une quantité connue (122) de métal dans son état semi-solide vers une cavité de moulage d'une machine de moulage sous pression. Ce système de transfert (107) comprend un tube aspirateur chauffé (108), une source de vide pour le pochage sous vide du métal semi-solide (34) du bain (16) à une matrice, une pointe de piston (132) fournissant au débit d'air continu un passage permettant le pompage du tube aspirateur (108) pendant le moulage, et enfin, un système de remplacement de métal permettant de remplacer la quantité connue (122) de métal transféré par une quantité similaire (126) de métal liquide (32), de manière à maintenir de façon contrôlée un bain isotherme homogène (16) de métal semi-solide (34) pouvant s'utiliser dans des opérations de moulage sous pression.

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