鋳造法には，連続鋳造や低圧鋳造，ダイカストなど様々な方法があるが，そのうちの一つに遠心鋳造というものがある。遠心鋳造とは，鋳型を回転させることで，遠心力により加圧しながら溶湯を鋳込む鋳造方法である。遠心鋳造は遠心力の効果により，引け巣や気孔が少ない緻密な組織を得ることができる，押湯を必要としないため歩留まりが良いなど，品質，生産性，経済性に優れた特長を有する。そのため現在では圧延ロールの製造に使用され，鉄鋼の製造プロセスにおいて重要な役割を果たす基幹技術となっている。%A centrifugal casting method is a key technology for producing high quality rolls which are used in a rolling process in steel industry. Because the surface quality of steel products highly depends on the roll quality and it is affected by liquid motion in the centrifugal casting method, control of the liquid motion is essential for supply of defect free rolls to the steel industry. In this research, liquid flow in the centrifugal casting method has been numerically calculated for clarification of difference of liquid motion in a horizontal type centrifugal casting method and a vertical one. The mainly obtained results are as follows. The center of the gravity periodically oscillates and its cycle is longer than the rotation cycle of the mold in the both cases of the horizontal and vertical types. Its time average in the horizontal type locates above the center axis of the mold while that in the vertical type is the same with the center axis. Increase in apparent viscosity in the vicinity of the mold wall accelerates the damping of the oscillating motion of the center of the gravity.
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