PURPOSE: To prevent metal penetration and damage of short side wall refractories by the metal penetration at the time of casting a unidirectionally solidified steel ingot by sealing the spacings between the side walls, molding board and short side walls, then executing casting.
CONSTITUTION: A frame 2 made of a U-shaped steel sheet is supplied into the spacing between the side walls 4 and the molding board 5 and the short side walls in synchronization with the cyclically moving side walls 4 and molding board 5 across the side walls 4 and the cooled molding board 5 at the time of sealing the spacings between the side wall 4 and the molding board 5 and the short side walls. A molten metal is cooled and solidified before the molten metal penetrates into the spacings between the side walls 4 and the molding board 5 and the side walls. The steel sheet is formed to such a thickness at which the latent heat as much as the cooling and solidifying of the molten metal is absorbed before the penetration of the molten metal.
SHINJO YUTAKA
OGUCHI MASAO
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