Method and installation for low pressure die casting in a...

Details Method and installation for low pressure die casting in a... Method and installation for low pressure die casting in a...

B - Operations, Transporting

22

D

B22D 18/04 (2006.01)

Patent

CA 2282673

In a case (1) is arranged a ceramic casting die (21) defining a casting zone (22), surrounded by a sand mass (23) without binder. The casting zone is connected to a metal liquid source (4) below wherein are successively applied a pressure (P1) bringing the metal to the threshold of the casting zone (22), a pressure (P2) slightly higher than what is required to fill said zone, then an outright excess pressure (P3); finally the pressure is brought back to the first value (P1). When the casting zone is filled, the space containing the sand mass (23) is depressurized to prevent deformation of the casting die (21) caused by the excess pressure (P3), at least until a metal crust is formed on the casting die, and at most until the excess pressure start to decrease in the liquid metal source (4).

Dans un caisson (1) est disposée une coquille céramique (21) délimitant un espace de coulée (22), entourée d'une masse de sable (23) sans liant. L'espace de coulée est relié à une source (4) de métal liquide en contrebas dans laquelle sont appliquées successivement une pression (P1) amenant le métal au seuil de l'espace de coulée (22), une pression (P2) légèrement supérieure à celle nécessaire pour remplir cet espace, puis une nette surpression (P3); enfin la pression est ramenée à la première valeur (P1). Lorsque l'espace de coulée est rempli, l'espace contenant la masse de sable (23) est mis en dépression pour empêcher les déformations de la coquille (21) dues à la surpression (P3), au moins jusqu'à la formation d'une croûte métallique contre la coquille, et au plus jusqu'au début de la diminution de la surpression dans la source (4) de métal liquide.

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