制备稀土烧结磁石的方法及设备

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模具包括压模、上冲模、以及下冲模，上冲模及下冲模的其中一者或两者之压力面的形状为非平面的，模穴在压模和下冲模之间被定义出来，模具被结合到给料器，给料器包括在其下端埠设有主滤网的吹射机(shooter)，主滤网具有与压力面的非平面形状大致相同的筛选表面(sifting surface)。藉由将合金粉末(alloy powder)经由吹射机和滤网供给到模穴中同时对吹射机施加微弱的振动、在磁场中对在模穴中的合金粉末填充施加单轴压力(uniaxial pressure)以形成母材、以及对母材加热处理，稀土烧结磁石被制备出来。 A mold comprising a die, an upper punch, and a lower punch, the pressure surface of one or both of the upper and lower punches being shaped non-planar, a cavity being defined between the die and the lower punch, is combined with a feeder including a shooter provided with a main sieve at its lower end port, the main sieve having a sifting surface of substantially the same non-planar shape as the pressure surface. A rare earth sintered magnet is prepared by feeding an alloy powder into the cavity through the shooter and sieve while applying weak vibration to the shooter, applying a uniaxial pressure to the alloy powder fill in the cavity under a magnetic field to form a precursor, and heat treating the precursor.