Low pressure casting process and apparatus

Details Low pressure casting process and apparatus Low pressure casting process and apparatus

B - Operations, Transporting

22

D

B22D 18/00 (2006.01) B22D 18/04 (2006.01) B22D 27/13 (2006.01) B22D 41/00 (2006.01)

Patent

CA 2166209

Molten metal is delivered from a master furnace (12) to the holding chamber of a low pressure casting machine (14) by a launder assembly (16) having a unitary, quickly replaceable, valve assembly (18). The valve (18) has a plug (130) mounted for rotation in a valve body (96). In a modification, the valve has a port (214) centered in a valve plate and a movable plug of aluminum titanate (212). In operation, the valve (18) is opened to permit the molten metal within the master furnace (12) and the holding vessel (40) to seek a substantially uniform level and closed when the low pressure casting is initiated. While the valve (18) is closed, a pressurizing gas is introduced into the holding vessel (42) so that molten metal will rise up a riser tube (58) into a mold.

Du métal fondu est transporté d'un fourneau maître (12) vers la chambre de retenue de métal fondu d'un appareil (14) de coulée sous basse pression par un ensemble chenal de coulée (16) qui comprend un ensemble vanne (18) en une seule pièce, rapidement remplaçable. La vanne (18) comprend un opercule (130) monté rotatif dans un corps (96) de vanne. Dans une variante, la vanne présente un orifice (214) centré sur une plaque de vanne, ainsi qu'un opercule mobile composé de titanate d'aluminium (212). En cours de fonctionnement, la vanne (18) est ouverte afin de permettre au métal fondu dans le fourneau maître (12) et la cuve (40) d'atteindre un niveau pratiquement uniforme, et refermée lorsque le cycle de coulée sous basse pression démarre. Lorsque la vanne (18) est fermée, un gaz de mise sous pression est introduit dans la cuve (42) de sorte que le métal fondu va s'élever dans un tube ascendant (58) jusqu'à un moule.

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