Patent ID: 8113913

Claim:
A method for the simultaneous double-side grinding of a plurality of semiconductor wafers, comprising positioning each one of the plurality of wafers such that it is freely moveable in a cutout of one of a respective plurality of carriers caused to rotate by means of a rolling apparatus and is thereby moved on a cycloidal trajectory, wherein the semiconductor wafers are machined in material-removing fashion between two rotating ring-shaped working disks, each working disk having an outer edge and an inner edge and comprising at its surface a working layer containing bonded abrasive and having an inner circumference and an outer circumference, the surfaces of the working layers defining a working gap between them, wherein the location-dependent width of the working gap is determined during machining, and the shape of at least one working disk is altered thermally by changing the temperature or the volumetric flow rate or both of a cooling lubricant introduced into the working gap during machining, depending on the measured location-dependent width of the working gap such that the magnitude of the ratio of the difference between the maximum and minimum widths of the working gap to the width of the working disks, during at least the last 10% of material removal, is at most 50 ppm.