| 摘要 |
PROBLEM TO BE SOLVED: To secure the easiness of precise manufacturing and the sufficient strength of a shank by well designing the formation of a coolant feed passage and a coolant discharge groove or the structure of the shank, and to improve chip discharging capability by the coolant. SOLUTION: A through hole 7 is axially formed at the whole area concentrically with the shank 3, and the through hole 7 forms the coolant feed passage 2. A part of the outer peripheral wall of the shank 3 is axially cut off linearly at the whole area avoiding the through hole, and the cut-off part 8 forms the coolant discharge groove 1. COPYRIGHT: (C)2005,JPO&NCIPI
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