交流磁場印加連鋳モールドにおける鋳片の表面性状に及ぼす動的なメニスカス挙動

抄録

In order to understand the meniscus behavior in the pool of a continuous caster with high frequency magnetic field applied from the outside of the mold, a model experimental work was conducted by using molten gallium which has a low melting point (301.8K). The terms meniscus height, meniscus depth and intermittently contacting distance are newly defined and measured for precise study of the state of contact between the mold and molten metal. Contacting pressure between the metal and the mold was calculated and the dynamic meniscus behavior was measured indifferent relative positions of the coil and the molten metal surface. The meniscus oscillating conditions to provide a good surface quality were estimated by examining the relationship between the surface roughness of a cast tin and the dynamic meniscus behavior. It was found that the meniscus is not stationary but repeats an intermittently contacting between the mold and the metal. The intermittently contacting distance, the meniscus height and the meniscus depth can be controlled by the magnetic field intensity and the relative position of the coil. It is estimated that the intermittently contacting behavior plays an important role in improving the surface quality of cast ingots.