Fluid-tight cold-chamber pressure casting apparatus
AssigneeGroupement pour les Activites Atomiques et Avancees "GAAA" S.A.
InventorHenri Carbonnel
Life of this patent
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Abstract
Apparatus comprising a crucible, a level-determining tank, a vacuum pump, an injection cylinder, a mould and appropriate interconnecting pipes. Molten metal is kept under vacuum throughout except that in a modification a gas may be deliberately introduced into the mould to provide a surface treatment of the casting.
Claims7
In a method for rapid casting of molten metal comprising the step of pumping molten metal through an ascending pipe from a closed crucible containing molten metal by a pump at least partially immersed in said molten metal to an injection cylinder connected to a mold at a level above said crucible, and determining the level of molten metal in the injection cylinder by a level determining tank fluid connected by way of a return pipe to the crucible and to the ascending pipe, the improvement comprising:
- maintaining a common vacuum pressure above the molten metal within the crucible, the level-determining tank and the injection cylinder during pressure casting until at least the molten metal has cooled in the mold.
In a fluid-tight cold chamber pressure casting apparatus comprising:
- a mold;
- a crucible closed by a cover, said crucible adapted to contain molten metal during operation of the apparatus;
- a pump for molten metal positioned to be at least partly immersed in said molten metal;
- an ascending feed pipe rising from the molten metal pump;
- a level-determining tank, means fluid connecting said level-determining tank to both a return pipe for returning the molten metal to the crucible and to the ascending feed pipe;
- an injection cylinder connected to said feed pipe being supplied with molten metal and connected to the mold;
- the improvement comprising:
- a vacuum pump, and
- means for commonly connecting said vacuum pump to the crucible, the level-determining tank and the injection cylinder for maintaining the same vacuum pressure above the molten metal within said crucible, said tank and said injection cylinder.
Dependencies are inferred from the claim text.