| 摘要 |
PROBLEM TO BE SOLVED: To provide an end mill capable of machining a surface while its cut face roughness is kept excellent for a long time. SOLUTION: This end mill is provided with a first flank laid along the outer circumferential cutting edge of the end mill, and also with a second flank linked with the first flank. In this case, the width of the first flank shall be 1/2000 to 1/100 of the diameter of the end mill cutting edge, the relief angleθ1 of the first flank shall be greater than 2 deg., but less than 5 deg., the relief angleθ2 of the second flank shall be greater than 10 deg., but less than 20 deg., and the width W1 of the first flank shell be 1/100 to 1/10 of the width W2 of the second flank.
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