| 简介 |
PROBLEM TO BE SOLVED : To provide a rare-earth bond magnet having a low hole rate, high dimensional precision, excellent moldability and excellent magnetic characteristics. SOLUTION : First, rare-earth magnetic powder, binder resin composed of thermoplastic resin and antioxidant are mixed with predetermined ratios and the mixture is kneaded at a temperature higher than the heat deformation temperature. Then the kneaded mixture is granulated or rectified to obtain grains. The grains are subjected to the compression molding at a 1st temperature at which the thermoplastic resin is softened or melt and then cooled to a 2nd temperature which is at least lower than the 1st temperature while the pressure is applied and the thermoplastic resin is solidified to obtain a rare-earth bond magnet. It is recommended that the 2nd temperature is lower than the melting point or the heat deformation temperature of the thermoplastic resin. |
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