PURPOSE: To prevent the slide of a cutting edge and to obtain a good cutting performance by forming a lot of minute sawteeth whose mean projection in the radial direction of a circular cutter is 10 - 100μm on the cutting edge.
CONSTITUTION: The outer peripheral face of the grinding belt wound by bringing between plural pulley abuts onto the edge part 10B of the circular cutter 10 to be ground so that the longitudinal direction of the grinding belt may make 15 - 90° for the tangential direction of the circular cutter 10 viewed from the axial line direction of the circular cutter 10. In this state the circular cutter 10 is rotated around the axial line, while grinding the edge part 10B by rotating at least one pulley and moving the grinding belt. A lot of minute saw teeth 14 whose mean projection in the radial direction of the circular cutter 10 is 10 - 100μm are thus formed on the cutting edge 10B of the circular cutter 10.
INOUE MASAYUKI
KOJIMA TATSUO
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