Apparatus for molding at low pressure

Details Apparatus for molding at low pressure Apparatus for molding at low pressure

1975-05-07

1976-09-14

Shore, Ronald J.

Metal founding

Control means responsive to or actuated by means sensing or...

Responsive to thermal condition

164309, 164337, B22D 1706, B22D 1732

Patent

active

039801250

ABSTRACT:
The invention relates to a process and an apparatus for molding metals, alloys and plastics material under low pressure. A gas which is inert with respect to the material to be molded is injected at a controlled rate and in a controlled volume into the compression/expansion chamber of the apparatus during certain phases of the molding operation, while compressed air is used for establishing pressure in the chamber or furnace accommodating the crucible which contains the liquid material to be molded. By virtue of the invention, it is possible to avoid oxidation phenomena and to improve the quality of the moldings.

REFERENCES:
patent: 2210544 (1940-08-01), Galloway
patent: 2660769 (1953-12-01), Bennett
patent: 2997756 (1961-08-01), Strom
patent: 3761218 (1973-09-01), Portaglier

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