Production process for ring shaped resin bonded magnet

A process of producing a ring shaped resin bonded magnetic member by molding a feed mixture for molding which contains a lubricant and a magnetic powder composite made of magnetic powder (such as Fe—B—R based magnetic powder) and a heat curable resin composition which is in a solid state at a room temperature, the magnetic powder composite having a predetermined particle size range, the process comprising the steps of:

• (i) filling an annular cavity of a mold with the feed mixture for molding by means of its powder fluidity;
• (ii) heating an inner peripheral surface of the annular cavity so as to transfer heat to the feed mixture through the inner peripheral surface, 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;
• (iii) cooling the inner peripheral surface of the annular cavity 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;
• (iv) releasing and taking out the green compact from the cavity, and
• (v) heating the green compact to a temperature not lower than the curing temperature of the resin composition.