Patent ID: 6227952
Filing Date: 2001-05-08
Classification: B24B,Y10T

Abstract:
An apparatus for generating a concave surface from a brittle-hard rough blank for eyeglasses (workpiece) during a CNC-controlled machining process in which the workpiece, which is blocked up, and a disk-shaped grinding tool, which has a back surface and an annular grinding lip, are moved relative to each other in two linear axes of motion (x and y axis) and two axes of rotational movement making an angle (.varies.) to each other, the first axis being assigned to the workpiece (b-axis) and the other axis being assigned to the tool (c-axis), characterized in that the grinding lip at its largest radius merges into a circular cutting edge, wherein the back surface of the tool, which faces away from the grinding lips also merges into the cutting edge, and wherein the angle between the back surface of the tool and the rotational axis (c-axis) of the tool corresponds to the angle (.varies.) between the rotational axis (c-axis) of the tool and the rotational axis (b-axis) of the workpiece.