| 摘要 |
A surface grinding method and apparatus wherein workpieces are ground with a ring-shaped grinding wheel having a ring-shaped grinding surface the inner diameter of which is relatively large with respect to the dimensions of the workpieces. The method and apparatus include steps and structure for providing between the workpieces and the ring-shaped grinding wheel a relative movement where the workpieces travel along a substantially cycloidal path with each workpiece having a point at the surface thereof which is ground by the grinding wheel and passes at least twice across the grinding surface between the outside and the inside thereof. To bring about this relative cycloidal movement, the central axis of either of the work-supporting structure or the grinding structure, preferably the work-supporting structure, is displaced around an axis which is parallel to its central axis, while this central axis is simultaneously moved inwardly toward and outwardly away from the axis parallel thereto.
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