MAGNETIC FIELD FORMING APPARATUS AND METHOD, RING TYPE MAGNET FORMING APPARATUS, RING TYPE MAGNET MANUFACTURING METHOD, AND RING TYPE SINTERED MAGNET

摘要

PROBLEM TO BE SOLVED: To form, during formation of a ring type magnet, a molded body having a small density difference, small fluctuations in magnetic characteristics in the axial direction, and longer axis. SOLUTION: The molded body comprises an elastic dice, preferably a rubber dice 10f having a ferromagnetic material body; a core 10d allocated within the dice 10f to form a ring-shaped space for the dice 10f; a lower punch 10e which closes the ring-shaped space to form a cavity 10h to which the magnetic powder 11 is supplied until it becomes full; and a pressurizer 50 for pressurizing the magnetic powder 11 to fill the cavity 10h and the dice 10f from the opposite side of a lower punch 10e. The magnetic field in the radial direction crossing at the right angle with the pressurizing direction is applied to the magnetic powder 11 which is pressurized within the cavity 10h. COPYRIGHT: (C)2005,JPO&NCIPI