| 摘要 |
PURPOSE:To manufacture a rare-earth magnet whose magnetic characteristic is high and whose radial orientation is cylindrical by a method wherein the kneaded substance of an Nd-Fe-B-based anisotropic magnet powder and a thermosetting resin is filled and it is compression-molded in a static magnetic field superposed with a pulse magnetic field. CONSTITUTION:A magnet powder compound is filled into a cylindrical molding space 1; an upper punch 5 is fitted; a column body 12 and a cylinder body 13 are arranged; an upper coil 9 and an upper outside yoke 11 are arranged on it; a metal mold is completed and installed on a press machine. Then, a DC current is made to flow to a lower coil 8 and the upper coil 9; a pulse current is made to flow to them from a capacitor magnetic-field generation apparatus and, at the same time, the upper punch is lowered by a prescribed height. Then, the pulse current is made to flow and, at the same time, the upper punch is lowered in the same manner as a first operation. A charging operation is executed again; after that, a third operation is executed in the same manner. After that, a pressure is exerted on the upper punch without applying a magnetic field; a pulse current is made to flow to the reverse direction; a demagnetization operation is executed; a cylindrical molded body is taken out form the metal mold; a heat treatment is executed; an epoxy resin is hardened. Thereby, it is possible to manufacture a magnet whose magnetic characteristic is high and whose radial orientation is cylindrical. |
