Specialized metallurgical processes – compositions for use therei – Processes – Process control responsive to sensed condition
Patent
1993-04-13
1994-07-19
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Process control responsive to sensed condition
75678, 266 91, 266208, C22B 904
Patent
active
053305558
ABSTRACT:
The invention relates to a process and apparatus for manufacturing low-gas and pore-free aluminum casting alloys by vacuum degasification and densification of the melt. Contact between the aluminum melt and the atmospheric humidity of the alloying process, from refining to continuous casting of the cast bars, is kept extremely short, so that effective vacuum degasification, and a high cooling rate, can prevent the formation of gas pores. After the metal melt is alloyed in a smelting furnace, the melt is fed through a system of gutters directly to at least one vacuum furnace. Refining components are added in the vacuum furnace and heating is conducted to provide the pouring temperature required for continuous casting. The vacuum in the vacuum furnace is maintained to degasify the melt and increase the density thereof, monitored by periodic measurements of the metal density until a stable maximum density is obtained, and the metal melt is then fed through the gutter system directly to the continuous casting mold to produce low gas, substantially pore-free aluminum alloy castings.
REFERENCES:
patent: 4049248 (1977-09-01), Gjosteen et al.
patent: 4258099 (1981-03-01), Narumiya
patent: 4714104 (1987-12-01), Ouchi et al.
patent: 4738717 (1988-04-01), Dokken
Patent Abstracts of Japan, vol. 8168, Aug. 1984 Re Jap. Pat. No. JP 59 067350 dated Apr. 1984.
Andrews Melvyn J.
Vaw Aluminium AG
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