Japanese Patent JPH0541395

B2

PURPOSE:To improve the extent of efficiency, by dipping a float in a magnetic fluid containing abrasive grains, giving buoyance to this float in making an external magnetic field act on the magnetic fluid, while pressing these abrasive grains between a float acting surface and a workpiece to this workpiece by dint of the buoyancy, and giving relative motion to an interval between the workpiece and the magnetic fluid. CONSTITUTION:A workpiece 3 is attached to the underside of a disc 6 as a driving jig free of rotation, and it is dipped in the vicinity of a level of a magnetic fluid 2 containing abrasive grains in a vessel 1. Here, a float 5 is dipped in the magnetic fluid 2, and if an external magnetic field is made to act on by a magnet 4 from the lower part of the magnetic fluid 2, buoyancy acts on these abrasive grains, floating them upward, and thereby an abrasive grain layer of high density is formed in the upper part of the magnetic fluid 2. Simultaneously with this, the buoyancy is given to the float 5 as well, and the float 5 is floated upward, strongly pressing these abrasive grains existing in the upper part to a surface of the workpiece 3. Under this state, when the driving disc 6 is rotated with a vertical shaft 61 as the center, the under side being contacted with these abrasive grains is polished. In this case, the polishing rate is improved by action of the float 5.

KATO YASUSHI
UMEHARA TOKUJI

JP2644387A

June 23, 1993

February 09, 1987

Click for automatic bibliography generation  

KATO YASUSHI
JGC CORP

B24B31/112; B24B37/00; (IPC1-7): B24B37/00; B24B31/112

Next Patent: PRODUCTION OF ALPHA-OLEFIN POLYMER