| 摘要 |
PROBLEM TO BE SOLVED: To provide a radius end mill preventing particularly the bottom cutting edge peripheral end side of a corner cutting edge and a bottom cutting edge from becoming dull in sharpness and from being degraded in chip discharging property while sufficiently securing a required clearance angle for each of a peripheral cutting edge, the bottom cutting edge and the corner cutting edge, and securing cutting edge strength to cause no chipping even in high-feed machining. SOLUTION: The peripheral cutting edge 5 extending from the tip side toward the rear end side is formed at the tip part outer periphery of an end mill body 1, and the bottom cutting edge 9 extending from the inner peripheral side to the outer peripheral side is formed at the tip of the end mill body 1. The corner cutting edge 12 curved to project is formed on the tip outer peripheral side of the end mill body 1 from the tip 5A of the peripheral cutting edge 5 to the outer peripheral end 9A of the bottom cutting edge 9, and the clearance angle of the corner cutting edge 12 in cross section orthogonal to the corner cutting edge 12 is gradually decreased from the tip 5A of the peripheral cutting edge 5 toward the outer peripheral end 9A of the bottom cutting edge 9. COPYRIGHT: (C)2005,JPO&NCIPI
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