MAGNETIC GRINDING METHOD AND DEVICE BASED ON GENERATION OF PLURALITY OF ALTERNATING FIELDS

摘要

PROBLEM TO BE SOLVED: To facilitate magnetic grinding for a large and complex work by combining a plurality of alternating fields, generating an alternating field having a desired expansion, disposing a medium and the work in this alternating field in a free state and magnetic-grinding the work. ;SOLUTION: Three alternating field generation units 1 are provided by fixing the center of a magnet disk 4 in the shaft 3 of a motor 2 and disposing disk permanent magnets 5 and 5 at equal intervals on the upper surface 4a of the magnet disk 4. The three units 1 are disposed in the lower part of the same disk 6 to be fixed at equal intervals on a concentric circular circumference. When each motor 2 and an oscillation motor are rotated forward/backward, the disk 6 is rotated, the relative position of the magnet disk 4 is followingly changed and the positions of the permanent magnets 5 and 5 are also changed. Thus, the dead angle part of an alternating field produced by each unit 1 is eliminated. Then, a work and a medium in a container installed in the upper part of the device take complex fluctuating states by the alternating field of the lower part and thus the work housed in the medium is uniformly ground.;COPYRIGHT: (C)1998,JPO