| 摘要 |
PROBLEM TO BE SOLVED: To improve the broken resistance while preventing the generation of crack by setting the grinding mark direction at a specified angle against the extension direction of the predetermined cutting blade. SOLUTION: Each peripheral side of a cutting face 3 of a rectangular parallelopiped chip is formed at 12.7 mm, and thickness of the rectangular parallelopiped chip is formed at 4.76 mm. Chamfering is performed to a cutting blade 5. Surface roughness Ry of the cutting face 3 of a cutting tool 1 is set at 3.0 or less, and grinding mark direction of the cutting face 3 is set at 10-170 degree against the cutting blade direction of the predetermined cutting blade. Grinding mark direction of a flank 7 is set at 0-20 degree against the predetermined cutting blade direction. Breakdown to toughness of the cutting tool 1 is set at 3-8 Mpa.m1/2 range. In the case of setting the grinding mark direction of the cutting face 3 at 10-170 degree, a market tool grinder is used. Angle of a jig for installing the cutting tool 1 on a diamond grinding wheel is adjusted. Cutting blade direction of the cutting tool 1 is arranged in any direction except for the parallel direction with the grinding direction, and in this condition, the tool grinder is operated for grinding.
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