CUTTING METHOD FOR HARD AND BRITTLE MATERIAL

摘要

PURPOSE:To dissolve a bending force acting on a thin plate during cutting and to make no breakage of the cut thin plate, by setting a group of nozzles for injecting gas to one side face or another side face of an inner circumferential blade in accordance with the warp of the rotating inner circumferential blade and dissolving the warp. CONSTITUTION:The warp generated in an inner circumferential blade 3 during cutting is detected by means of a displacement sensor 8 and the detecting sign is input in a warp controlling part 10. In this warp controlling part 10, air pressure injected from a group of nozzles 7L and 7R, set in parallel in the radial direction of the inner circumferential blade 3 to one face or another face of the inner circumferential blade 3 in accordance with the amt. of displacement detected is controlled. A back pressure is acted between the inner circumferential blade 3 and each nozzle by the controlled air pressure injected from this group of nozzles and the inner circumferential blade 3 is sucked to the side of nozzles injecting air. The warp of the inner circumferential blade 3 during cutting is dissolved over its radial direction range by this sucking and the parallelism of a thin plate cut from a material to be cut becomes good and no crack nor scattering of the plates occurs.