| 摘要 |
PROBLEM TO BE SOLVED: To improve machining performance of a ball end mill having a center cutting edge 4a of a ball end cutting edge 4 made of hard metal and a peripheral cutting edge 4b made of a hard sintered body respectively to improve wear resistance and defect resistance, reduce cost and ease regulations in application to a tool with a small diameter. SOLUTION: A cylindrical base material 3 cut from a composite sintered body is joined with a tip of a shank 2, and the material 3 is sharpened. The base material 3 is formed by stacking a hard sintered body layer 3a constituting the peripheral cutting edge 4b of the ball end cutting edge 4 and a hard alloy layer 3a constituting the center cutting edge 4a and integrally sintering them. COPYRIGHT: (C)2008,JPO&INPIT
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