Method for low-pressure casting in a sand mould

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

1975-12-19

1977-02-22

Baldwin, Robert D.

Metal founding

Process

Shaping liquid metal against a forming surface

164119, 164137, B22D 1706

Patent

active

040087492

ABSTRACT:
A mould cavity for casting the part is supplied with liquid metal by a main runner formed in the mould and connected to the upper end of a supply pipe whose sectional size is in the neighborhood of the sectional size of the main runner and which extends into a fluidtight vessel containing the liquid metal. The metal is supplied to the mould cavity by the action of a gas pressure on the free surface of the metal in the vessel.
According to the invention, the mould cavity is supplied with the metal from the main runner through a secondary runner whose sectional size is much less than the sectional size of the main runner, and the gas pressure is maintained until the secondary runner has solidified whereafter the gas pressure is returned to atmospheric pressure, whereby the liquid metal in the main runner and supply pipe returns to the vessel.

REFERENCES:
patent: 1797041 (1931-03-01), Becker
patent: 3163897 (1965-01-01), Sylvester
patent: 3532154 (1970-10-01), Balevski et al.
patent: 3628598 (1971-12-01), MacNeill et al.

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