Method and apparatus for low-pressure casting in a sand mould

Details Method and apparatus for low-pressure casting in a sand mould Method and apparatus for low-pressure casting in a sand mould

1976-11-17

1979-01-09

Husar, Francis S.

Metal founding

Means to shape metallic material

Pressure shaping means

164137, 164343, B22D 1706, B22D 1726

Patent

active

041333705

ABSTRACT:
A low-pressure metal repetitive casting apparatus comprising a large capacity fluidtight vessel containing liquid metal to cast, in particular a high melting point metal; an upwardly open supply pipe partly extending into the vessel through a wall of the vessel and having a lower end immersed in the metal; a source of gas under pressure; a device for selectively putting the source in communication with the interior of the vessel and closing off said communication; and a series of blind sand moulds each defining at least one mould cavity, a main runner whose sectional size is in the neighborhood of the sectional size of the supply pipe and communicates with the mould cavity and has a lower open end portion capable of being adapted for connection to an upper end portion of the supply pipe, and at least one secondary runner which puts the main runner in communication with the mould cavity and has a cross-sectional area so calibrated that, during the casting, the solidification time of the secondary runner is slightly greater than the minimum time during which the cavity must be supplied with liquid metal to obtain a sound cast part therein, said solidification time being much smaller than that of the main runner.

REFERENCES:
patent: 2561062 (1951-07-01), Ling
patent: 3163897 (1965-01-01), Sylvester
patent: 3628598 (1971-12-01), MacNeill et al.

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