| 摘要 |
PROBLEM TO BE SOLVED: To provide a radius end mill capable of preventing fracture of a round corner cutting edge arranged on the outer periphery of a tip part to elongate a service life and enabling manufacturing at low cost. SOLUTION: In the radius end mill 1, the round corner cutting edge 3 is provided on the outer periphery of the tip part of an end mill body 2 rotated around an axial line O. A tip cutting edge part 9 comprising a tip part of the round corner cutting edge 3 and an end cutting edge 4 arranged on the tip side of the round corner cutting edge 3 is formed of a cubic boron nitride sintered body, and the length L in the axial line O direction of the tip cutting edge part 9 is set smaller than the radius r of the round corner cutting edge 3. COPYRIGHT: (C)2009,JPO&INPIT
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