| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball end mill which is excellent in chip discharging performance in the vicinity of a chisel, good in finished surface roughness of a workpiece, and long in life. SOLUTION: The cutting edge ball end mill has a plurality of ball cutting edges 2 at the tip of a tool main body, and a chisel edge 4 which is formed by intersection of flanks 3 of the ball cutting edges 2, and the tool main body including the ball cutting edges 2 is made of a cermet. According to the structure of the ball end mill, the ball cutting edge 2 has a negative rake, and a chisel width w of the chisel edge 4 is set to the range of 0.06 to 0.08 mm. Further, an angleβformed with a cutting face of the ball cutting edge and an end gash face is set in the range of 110 to 130°. COPYRIGHT: (C)2005,JPO&NCIPI
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