Injection molding device for bond magnet and injection molding method of bond magnet

摘要

PROBLEM TO BE SOLVED: To provide an injection molding device of a bond magnet capable of improving the magnetization rate of the bond magnet, and an injection molding method.SOLUTION: An injection molding device comprises: a bottom part that supports a rotor core 12; an intermediate part having a toric magnetization mechanism 23; and a top part having an injection mold 63 in which a gate 77 that injects a bond magnet material in a melt state supplied from a supply source to a magnet insertion hole 15 of the rotor core 12 is formed. The injection mold 63 includes a cylindrical projection part 72 in which the gate 77 is opened to an end surface, and a side surface 73a of a magnetic flux application member 73 made of a ferromagnetic material is embedded into the projection part 72 so as to be exposed to an outer peripheral surface of the projection part 72. The magnetization mechanism 23 is formed in a toric shape in which a tip part of the projection part 72 can be housed in an inner peripheral side with the rotor core 12 by alternately arranging a plurality of yokes 41 and a permanent magnet 42 in a peripheral direction, and a magnetic path 41a of each yoke 41 is opposite to the side surface 73a in a radial direction.SELECTED DRAWING: Figure 6