Countergravity casting apparatus and method using elastomeric se

Details Countergravity casting apparatus and method using elastomeric se Countergravity casting apparatus and method using elastomeric se

1989-09-20

1990-12-18

Lin, Kuang Y.

Metal founding

Means to apply vacuum directly to work or to hold or...

Means applying vacuum or suction directly to molten casting...

164348, B22D 1806

Patent

active

049779486

ABSTRACT:
A vacuum countergravity casting apparatus includes a vacuum chamber having a thermally conductive peripheral wall and a gas permeable mold sealed to the lower end of the peripheral wall by an elastomeric sealing gasket engaged therebetween. The peripheral wall is cooled at a location above and remote from the sealing gasket and an underlying molten metal pool when the mold is immersed in the pool during casting to maintain, by thermal conduction through the peripheral wall, the sealing gasket at a temperature to reduce thermal degradation thereof during casting; e.g., at a temperature below the gasket's thermal degradation temperature. Reduced thermal degradation of the sealing gasket during casting prolongs its useful life in casting successive molds.

REFERENCES:
patent: 2716790 (1951-05-01), Brennan
patent: 4340108 (1982-07-01), Chandley et al.
patent: 4606396 (1986-08-01), Chandley et al.
patent: 4616691 (1986-10-01), Voss
patent: 4632171 (1986-12-01), Almond

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