| 简介 |
A mold comprising a die (11), an upper punch (12), and a lower punch (13), the pressure surface of one or both of the upper and lower punches being shaped non-planar, a cavity (10) being defined between the die and the lower punch, is combined with a feeder (2) including a shooter (21) provided with a main sieve (22) 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 trembling and vertical reciprocation 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. |
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