| 摘要 |
PROBLEM TO BE SOLVED: To provide a formed rotary cutting tool capable of cutting work without performing preliminary work (rough work) while securing predetermined surface accuracy. SOLUTION: An outer peripheral cutting edge 14 is alternately provided with a reference shape part 30 in the same as an objective shape, and a recessed place 32. Both end parts of the recessed place 32 substantially become a shape of arranging a flat part of an objective shape on the top of a projecting part of a conventional roughing cutting edge due to being respectively smoothly connected to the reference shape part 30 via convex circular arc-shaped connecting parts 34 and 36, to provide the cutting performance improving effect similar to the roughing cutting edge. Since a phase of four outer peripheral cutting edges 14 is mutually respectively different by P/4 and a length dimension of the reference shape part 30 participating in cutting is the substantially same dimension as the P/4, while securing cutting performance close to the roughing cutting edge, work surface roughness is improved by the presence of the reference shape part 30. COPYRIGHT: (C)2005,JPO&NCIPI
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