PERMANENT MAGNET FORMING APPARATUS

PROBLEM TO BE SOLVED: To provide permanent magnet forming apparatus which can manufacture a ring type magnet wherein the impairment magnetic properties of a border portion between ring compacts is small with sufficient productivity. SOLUTION: The permanent magnet forming apparatus comprises a conveyance metallic mold 10 which is provided with a die, a core which is inserted inside the die and forms a ring-shaped space to the die, an underpunch which closes a lower part of the space and forms a cavity to which magnetic powder is supplied and which is filled with the magnetic powder, and an upperpunch for pressurizing the magnetic powder in the cavity. Further, the apparatus has the conveyance metallic mold 10 conveyable on a band conveyor 2, a supply/charge unit 3 which supplies and charges the magnetic powder inside the cavity, a punch set 4 which sets the upperpunch, a magnetic field forming unit 5 which performs orientation while applying magnetic field to the magnetic powder in a direction perpendicular to the pressurization direction and forms a compact wherein radial orientation is performed, an extraction unit 6 which extracts the compact from the conveyance metallic mold 10, and a stacking unit 8 which performs lamination of the compacts extracted from the conveyance metallic mold 10 to a plurality of steps in an axial direction of the compact. COPYRIGHT: (C)2005,JPO&NCIPI