PRODUCTION PROCESS FOR RING SHAPED RESIN BONDED MAGNET

摘要

There is provided a process of producing a ring shaped resin bonded magnetic member by molding a feed mixture (24) which contains a lubricant and a magnetic powder composite made of magnetic powder and a heat curable resin composition which is in a solid state at a room temperature. The process is characterized in that (i) heating an inner peripheral surface of the annular cavity (20) so as to transfer heat to the feed mixture (24) whereby heating the feed mixture to a temperature not lower than a softening temperature and below a curing temperature of the resin composition, and compressing the filled feed mixture after or during the heating; and (ii) cooling the inner peripheral surface so as to transfer heat from the heated and compressed feed mixture through the inner peripheral surface, whereby cooling the feed mixture to a temperature below the softening temperature of the resin composition so as to obtain a green compact having a ring shape.