SLAG REMOVAL FRAME FOR DC-CASTING ALUMINUM OR ALUMINUM ALLOY MATERIAL AND DC-CASTING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an aluminum or aluminum alloy material restraining entrapment of the oxide film produced on molten metal surface into a cast block, having excellent surface quality and reducing the development of casting crack. ;SOLUTION: A bottom base 8 is brought into contact with a mold 2 and a slag removal frame 1 is arranged in the mold 2, and a glass cloth 5 is arranged at the lower part of the molten metal pouring nozzle 4a in the slag removal frame 1, and the slag removal frame 1 is constituted with a frame member of four sides. In a range of ≥2/3 of the center part in the wide surface side 2a of the mold 2, the interval between the mold 2 and the slag removal frame 1 is formed so as to become ≤70mm. At the time of pouring molten aluminum 3 into the mold 2 through the molten metal pouring nozzle 4a from a trough 4 after filling the molten alumnum 3 into the trough 4, the slag removal frame 1 is floated up to the surface of the molten metal 3 so that the dipping depth of the slag removal frame 1 into the molten metal 3 becomes ≥10mm. At this time, dross and oxide film are developed on the surface of the molten metal 3 poured into the mold 2, but since the slag removal frame 1 having a desired size is floated up on the surface of the molten metal in the mold 2, the dross and the oxide film is accumulated in the inner part of the slag removal frame 1.;COPYRIGHT: (C)1998,JPO