PURPOSE: To make it possible to polish a work without damaging or deteriorating it by immersing the work in nonmagnetic liquid filled in a container, and applying an external magnetic field to a magnet at a float immersed in this liquid with a surface of the float contacting the work so as to move the work relatively through the float while pushing grinding material to it.
CONSTITUTION: A work 3 (such as of ceramic or aluminum) is immersed in nonmagnetic liquid 2 filled in a container 1 including grains of grinding material, and a float 5 having a magnet 5A on one side is immersed in the nonmagnetic liquid 2 with its floating surface contacting the work 3. By applying an external magnetic field produced by a second magnet 4 at the bottom of the container 1 disposed in parallel with the magnet 5A at the float 5 to this magnet 5A in this condition, relative motion is produced between the work 3 and the grinding material while the grinding material is pushed to the work 3 through the float 5, thereby the work 3 can be polished without being damaged or deteriorated by the process.
UMEHARA TOKUJI
ADACHI SHIGERU
HARADA YOSHIJI
JGC CORP
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