Industrial electric heating furnaces – Induction furnace device – Zone melting
Patent
1990-05-22
1991-03-26
Reynolds, Bruce A.
Industrial electric heating furnaces
Induction furnace device
Zone melting
373 70, 373138, 373140, 219 75, 219 1075, 219 1079, 219 1043, H05B 630
Patent
active
050035517
ABSTRACT:
An apparatus and method for inductively melting a quantity of metal, without having to contain the metal in a crucible, is described. The solid metal to be melted is placed within a first induction coil excited by an alternating current and adapted to provide a greater electromagnetic force towards the lower portion of the quantity of metal. The solid metal rests on a support, having an opening therethrough, which also comprises means for keeping the support at a low temperature relative to the metal as it melts. When energy in the form of the alternating current is provided to the coil, the metal melts from the top downward, but the concentration of electro-magnetic force towards the bottom of the metal causes the liquid metal to retain a cylindrical shape. A non-varying electromagentic field is applied to the quantity of metal to minimize violent stirring of the molten portion of the quantity of metal caused by the time-varying field.
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J. Zotos et al., "Ductile High Strength Titanium Castings by Induction Melting", American Foundrymen's Society Transactions, vol. 66, 1958, pp. 225-230.
Hoang Tu
Inductotherm Corp.
Reynolds Bruce A.
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