Method for the fine machining of piston rings and apparatus for carrying out same

A fine machining tool for fine machining an outside circumferential surface of radially outwardly expanded, ring-shaped workpieces having respective holes therein, the workpieces being combined to form a stack, the tool comprising:

• clamping means for clamping the stack, the clamping means including means for imparting a swivelling movement to the stack;
• a pair of segments disposed adjacent the clamping means, each of the segments having a segment surface defining a predetermined radius of curvature corresponding approximately to a radius of curvature of each of the workpieces expanded to a nominal diameter;
• grinding belt means disposed adjacent the segment surfaces;
• means for moving the segments into a processing position wherein the radii of curvature of respective ones of the segment surfaces share a common center point, the means for moving including a means for advancing the segments toward the stack such that the grinding belt means is brought into grinding contact with the stack and thereby assumes a contour of the segment surfaces, the clamping means being effective for moving the stack relative to the grinding belts after the segments have been moved into their processing position;
• and
• means for keeping the segments in their processing position while the stack is being moved.