Furnace construction for plasma arc remelting of metal

Details Furnace construction for plasma arc remelting of metal Furnace construction for plasma arc remelting of metal

1976-02-20

1977-04-19

Envall, Jr., R. N.

13 14, H05H 126

Patent

active

040189732

ABSTRACT:
A plasma arc remelting furnace system with improved components including mechanisms for independently vertically feeding and oscillating the metal blank through the top of the furnace. Multiple plasma arc torches (plasmatrons) are installed in a sealed chamber and adjustable operators enable angular disposition of individual torches. The torches have improved torch nozzles with heat sink construction enabling operation at higher temperatures, better stabilized plasma arcs and longer torch life. The system can utilize ingot molds of various cross-section shapes, i.e., round, square, rectangular and polygonal and, depending upon mold shape, the number of torches can differ. Operating circuits are provided for use with a plurality of different numbers (up to eight) of torches, either with direct current or alternating current power sources, and possible variations of circuits will enable using a large number of torches.

REFERENCES:
patent: 3429564 (1969-02-01), Snow
patent: 3496280 (1970-02-01), Dukelow et al.
patent: 3651238 (1972-03-01), Schlienger
patent: 3736361 (1973-05-01), Lakomsky et al.
patent: 3894573 (1975-07-01), Paton et al.

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