Method of reducing the pore density in a casting

Details Method of reducing the pore density in a casting Method of reducing the pore density in a casting

1985-11-08

1986-10-07

Andrews, Melvyn J.

Metal treatment

Compositions

Heat treating

148 13, 432205, C21D 153

Patent

active

046157450

ABSTRACT:
A casting (e.g. of aluminum or aluminum alloy) is made at least approximately free from pores by being subjected, in heated state, to isostatic compression in a liquid pressure medium. A rapid pressing operation of under one minute can be achieved if the casting is placed in a container, the container and the casting are heated to the required compression temperature before they are thereafter placed in a press chamber of a fast-acting press. When liquid pressure medium is fed to the press chamber and the necessary pressure is applied thereto, the pressure medium flows into the interior of the container via a number of channels in its wall and is simultaneously heated to the necessary temperature, prior to its contacting the casting.

REFERENCES:
patent: 2273500 (1942-02-01), Umlandt
patent: 4250610 (1981-02-01), Wilbers et al.
patent: 4349333 (1982-09-01), Bowles
patent: 4379725 (1983-04-01), Kemp

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