| 摘要 |
PURPOSE: To continuously supply an abrasive grain to a sphere, so that the sphere can be polished in good sphericity, by opening a hole in the center of a float, increasing a work load by the float when made a motion of the sphere in a magnetic fluid, also to increase a speed of the sphere in rotation on its own axis and revolving around, and so as to circulate the magnetic fluid containing the abrasive grain through this hole. CONSTITUTION: A hole 8A is opened in the center part of a float 3. A negative pressure in a lower surface of the float 3, generated in the case of rotating this float 3, is made to escape from the hole 8A, thus to suppress a vertical vibration of the float 3, also to stabilize a motion of a ceramic ball 2 in rotation on its own axis and revolution around. Since a magnetic fluid 9 containing an abrasive grain is circulated through this hole 8A, the abrasive grain is continuously supplied to this ball 2. By action of the hole 8A of the float 3 thus performed, when performed a motion of the ceramic ball 2 in rotating on its own axis and revolving around along inside a vessel 4A together with rotary motion of a drive shaft 1, the float 3 presses the ball 2 by magnetic levitating force to the vessel 4A and a slope of the drive shaft further rotated, consequently to efficiently polish the ball 2 into a spherical shape. |
