METHOD FOR MULTIPLE CUTOFF MACHINING OF RARE EARTH MAGNET

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PROBLEM TO BE SOLVED : To highly accurately cut off a rare earth magnet block having a height by using a thin rotary cutoff abrasive blade having a reduced effective diameter, in multiple cutting-off of a rare earth magnet. SOLUTION : When a plurality of cutoff abrasive blades having abrasive outer peripheral blades at the outer peripheral edge of a thin disk-shaped or thin doughnut-shaped disk base plate are arranged on a rotary shaft at predetermined intervals in its axial direction, and the rare earth magnet 103 is cut by rotating the plurality of cutoff abrasive blades to perform multiple cutoff machining, a cutting operation is started from the upper surface side of the rare earth magnet 103 downward. The cutting operation is once stopped without cutting the rare earth magnet 103 into pieces. The rare earth magnet 103 is turned upside down. The rare earth magnet 103 is disposed so that positions of cutoff grooves formed before and after the upside-down turning are vertically aligned with each other. The cutting operation is restarted from the upper surface side of the reverse rotated rare earth magnet 103 downward, and the cutoff grooves formed before and after the upside-down turning are made to communicate with each other to execute cutting. COPYRIGHT : (C)2012, JPO&INPIT