Grinding method
A surface to be polished having a plurality of surfaces of significantly different curvatures can be polished evenly by the use of resilient abrasive members by using a polishing method including the steps of selecting at least two resilient abrasive members 10 a , 10 b from the resilient abrasive members having a plurality of dome-shaped portions of different curvatures determined by a plurality of curvatures on the surface to be polished of the polishing target, and mounting the selected resilient abrasive members 10 a , 10 b to specific abrasive member mounting jigs 20 a , 20 b and polishing the surface to be polished of the polishing target L 2.
1. A polishing method for a polishing target having a plurality of surface portions of different curvatures using resilient abrasive members each having a dome-shaped portion, the resilient abrasive members being of a plurality of types having the dome-shaped portions of different curvatures, comprising the steps of:
selecting more than two of the resilient abrasive members according to the surface shape of the surface to be polished and having a plurality of surface portions of significantly different curvatures; and
polishing the surface to be polished having plurality of surface portions of significantly different curvatures by the use of the selected resilient abrasive members,
wherein the plurality of resilient abrasive members each is assigned to one of a plurality of divisions corresponding to the predetermined curvatures, and the step of selecting includes selecting a resilient abrasive member having a curvature which corresponds to the curvature of the assigned division prior to the step of polishing a curvature of the surface to be polished having a plurality of surface portions of significantly different curvatures;
and the plurality of divisions are provided by dividing the surface to be polished having a plurality of surface portions of significantly different curvatures, having the plurality of curvatures according to the curvature ranging from the largest curvature to the smallest curvature.
2. A polishing method according to claim 1 , characterized in that the step of selecting comprises selecting resilient abrasion members having the dome-shaped portions of curvatures close to the average curvature of the respective divisions of the surface to be polished of a plurality of curvatures, which are divided according to the curvature ranging from the largest curvature to the smallest curvature.
3. A polishing method according to claim 1 , characterized in that the step of selecting comprises selecting a resilient abrasive member having the dome-shaped portion of curvature close to the largest curvature of the surface to be polished, a resilient abrasive member having the dome-shaped portion of a curvature close to the smallest curvature of the surface to be polished, and a resilient abrasive member having the dome-shaped portion of curvature close to the average curvature between the largest curvature and the smallest curvature of the surface to be polished.
4. A polishing method according to claim 1 , characterized in that the step of selecting comprises selecting resilient abrasive members having the dome-shaped portions of curvatures close to the curvature of the central area of the surface to be polished.
5. A polishing method according to claim 1 , characterized in that the step of polishing comprises polishing while rotating a polishing target and the resilient abrasive member about their own axes, swinging the polishing target and the resilient abrasive member with respect to each other until substantial alignment of the center of curvature of the dome-shaped portion with the center of swinging motion of the polishing target is achieved.
6. A polishing method according to claim 1 , characterized in that the dome-shaped portion of the resilient abrasive member is formed of a resilient sheet into a hollow dome shape, and the step of polishing comprises polishing while applying pressure to the inner surface of the resilient sheet with a pressurized fluid injected into the hollowed portion to provide tension to the dome-shaped portion.