PURPOSE: To obtain a high-performance permanent magnet by horizontally installing a cast metal mold having a bottom face higher in cooling power than the side face of the metal mold at the time of casting and by pouring a molten alloy into the metal mold.
CONSTITUTION: A cast metal mold having a bottom face made higher in cooling power than the side face of the metal mold is installed horizontally and a molten alloy is poured into the metal mold. According to such casting, the air gap between the mold and ingot in the bottom face is sharply reduced by the effect of gravity and the substantial cooling power is improved so that columnar crystals can be seen to expand sharply. When a hot working process and heat treatment process are applied to a cast ingot obtained in this manner, it is possible to obtain a high-performance permanent magnet.
MATSUOKA KOJI
KOBAYASHI OSAMU
TAKAGI FUMIO
IHARA SEIJI
