Process and apparatus for automating a vacuum degasification cyc

Details Process and apparatus for automating a vacuum degasification cyc Process and apparatus for automating a vacuum degasification cyc

1980-11-26

1984-01-24

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 10V, 75 93AC, C22B 904

Patent

active

044274432

ABSTRACT:
Apparatus and process for automating a vacuum degasification cycle for metal alloys, particularly aluminum alloys. The process comprises adjusting the degasification speed to sequentially correspond to a plurality of sets of degasification speed parameters. Each set of degasification speed parameters corresponds to a predetermined desired degasification speed. The degasification speed may be adjusted by adjusting the vacuum surrounding the alloy. The degasification speed is triggered to change from corresponding to one set of parameters to another set of parameters by the sensing of a series of predetermined partial pressures of gas in the alloy. The apparatus includes an inlet-outlet assembly for transforming given indications into a numerical form for the parameters of the degasification cycle and a calculator assembly adapted to transform the speed of degasification into variations of theoretical partial pressure and to regulate the pressure in the enclosure of the furnace to obtain an identical variation to that required based upon the indications of the standard curve placed in the assembly memories. Several furnaces may be regulated. The temperature of the metal may be regulated at a level equivalent to that required before casting. The apparatus can include a microprocessor.

REFERENCES:
patent: 3352665 (1967-11-01), Stonkuist et al.
patent: 3594155 (1971-07-01), Ramachandran
patent: 3635696 (1972-01-01), Finkl
patent: 3700429 (1972-10-01), Ramachandran
patent: 3958981 (1976-05-01), Forberg
patent: 4003560 (1977-01-01), Carbonnel

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