Patent ID: 8567384

Claim:
A method for slicing an ingot in a form of a wafer, the method comprising: providing a plurality of grooved rollers, each grooved roller having a hollow shaft extending into the roller; winding a wire around the plurality of grooved rollers and pressing the wire against the ingot while making the wire travel; and supplying slurry to the grooved rollers; slicing the ingot; wherein during said slicing, measuring an amount of displacement of the ingot changing in an axial direction; generating a profile of the amount of axial displacement of the ingot relative to a depth of slicing, wherein the profile is generated from the measured amount of axial displacement of the ingot, and, based on the profile thus generated, controlling an amount of axial displacement of the grooved rollers by passing cooling water through the hollow shafts of the grooved rollers and adjusting a temperature and/or flow rate of the cooling water, the cooling water extending into the hollow shafts at least to the extent of all the grooves, and thereby slicing the ingot while controlling a relative position of the wire relative to an entire length of the ingot changing in the axial direction.