| 摘要 |
PURPOSE:To manufacture a resin-coupled type magnet, with good productivity, whose magnetic performance is high by a method wherein, after a magnet composition consisting of magnetic particles composed of a rare-earth metal and cobalt and consisting of a thermoplastic resin have been mixed and kneaded, the compound is magnetized in a high magnetic field and, after that, said mixed and kneaded material is extrusion-molded while the magnetic field is being impressed. CONSTITUTION:After magnet powder of an intermetallic compound mainly composed of a rare-earth metal, cobalt and iron and a thermoplastic resin have been mixed and kneaded sufficiently by using a mixer, this compound is granulated. This granulated magnet composition is magnetized in a magnetic field which is higher than a molding magnetic field by using a direct-current electromagnet or a pulsed magnetizer. Small particles of a magnetized magnet composition 8 are put into an extrusion- molding machine and heated inside a cylinder 2 so as to be transformed into a fluid state. Then, they are fed into a metal mold by means of a screw 3. The magnet composition injected into the metal mold is molded in such a way that the magnet powder are oriented while they pass through a metal mold 5 on which the magnetic field has been impressed.
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