Patent ID: 11878385
Assignee: SHIN-ETSU HANDOTAI CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 4:
5. The method for slicing an ingot according to claim 4, wherein
the temperature of the cooling water flowing inside the wire saw casing is controlled such that the temperature when the central portion of the ingot is sliced is higher than the temperature when slicing the ingot is started or ended by at least 4% of the temperature when slicing the ingot is started or ended,
the temperature of the cooling water flowing inside the wire guides is controlled such that the temperature when the central portion of the ingot is sliced is lower than the temperature when slicing the ingot is started or ended by at least 4% of the temperature when slicing the ingot is started or ended, and
the temperature of the slurry is controlled such that the temperature when the central portion of the ingot is sliced is lower than the temperature when slicing the ingot is started or ended by at least 4% of the temperature when slicing the ingot is started or ended, so that
the warps in the workpiece feeding direction of the plurality of wafers cut out from the ingot are convex shaped.