| 摘要 |
PROBLEM TO BE SOLVED: To efficiently work such a complicated shaped place as to work deep beyond a region to conventionally work and to reduce cutting remaining quantity at the time of cutting a hard solid material such as a forged article with a tool having an outer peripheral bottom blade. SOLUTION: The material is worked by moving the rotary cutting tool 1 having the outer peripheral bottom blade 2 while returning the tool 1 in the opposite direction at a fine pitch after starting working from a point where a working finishing point (s) in the front becomes less than the working finishing point (s) at the same position in the front row by passing the working finishing point (s) at the same position in the front row without working the position in the case when the working finishing point (s) at a position of a moving destination enters beyond the working finishing point (s) at the same position in the front row at the time of moving the tool 1 in the line direction at a constant pitch under a working method devised to cut an outline by moving the tool 1 in the line direction at a constant pitch (70 mm) by returning it after tamping and working to the working finishing point (s) by working and delivering the rotary cutting tool 1 having the outer peripheral bottom blade 2 in the axial direction, moving it to a next row at a constant pitch (10 mm) after working to an end part in the line direction and repeating the tamping work in the line direction again.
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