| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable casting an ingot having a good casting surface without measuring a temperature of a molten metal directly under the surface of the molten metal in a casting mold and in the vicinity of a wall surface of the casting mold.SOLUTION: With the input electric energy input from a plasma torch 7 arranged over a molten metal 12 in a casting mold 2 into the surface of the molten metal 12 in the casting mold 2, a thickness d of a flux 9 formed in the boundary surface between the wall surface of the casting mold 2 and the molten metal 12 in the casting mold 2, a horizontal distance L between the furthest point from the plasma torch 7 in the inside surface of the casting mold 2 and the center of the plasma torch 7, the heat transfer coefficient of the casting mold 2, the drawing speed of an ingot and the inner dimensions of the casting mold 2 as parameters, the temperature of the molten metal 12 directly under the surface of the molten metal 12 in the casting mold 2 and in the vicinity of the wall surface of the casting mold 2 is estimated, and individual parameters are adjusted so that the estimated temperature of the molten metal 12 in the vicinity of the wall surface becomes equal to or higher than the melting point of titanium or a titanium alloy to be casted.</p> |
