To enable to quick melt while preventing impurity from intruding at a low cost by selectively and sequentially executing induction-heating to plural solid alloy charging constituted elements separated in a refractory melting vessel.
In a melting example of Ti-6Al-4V alloy, after introducing a high m.p. lower part charging material constituted element C1 composed of Ti (slender small piece) spotted with a fixed quantity of V (black block) into the refractory melting vessel 54, a low m.p. upper part charging material constituted element C2 composed of a solid Al piece (round grain) and Ti piece, is introduced into 1/3 of the upper end of the vessel 54 and after selectively induction-preheating with an induction coil 68a, the constituted elements C1, C2 are melted with an induction coil 68. The upper constituted element C2 is made to flow toward the bottom part of the vessel 54 and the melting of the upper end or the lower end of the constituted elements C1, C2 is started and at the same time, the molten alloy is held to separate from the side wall of the vessel 54 with high induction power level and restrain harmful reaction with the refractory. Successively, a mold vessel 20 is descended and the molten alloy is sucked from a filling tube 23 and filled into a mold 22.
ERICKSON RONALD E
TOUSIGNANT PAUL J
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