| 摘要 |
PROBLEM TO BE SOLVED: To enhance rigidity of an R blade and to facilitate discharge of a large amount of chips. SOLUTION: In the R blade, rake angles a, b, c, d from a free end 23a (21a) at a bottom blade 21 side to a free end 23b (22a) at an outer diameter blade 22 side are set to a negative angle and are set to the relationship of a<b<c<d, that is, a negative angle continuously increased from the free end 23a at the bottom blade 21 side toward the free end 23b at the outer diameter blade 22 side. COPYRIGHT: (C)2004,JPO
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