| 摘要 |
PROBLEM TO BE SOLVED: To obviately prevent lowering of processing precision, in processing of a reverse tapered hole, by an edge being put back oppositely from the cutting direction, which originate the shortage of rigidity of a machine tool, in processing of the reverse tapered hole. SOLUTION: In the case of processing the reverse tapered hole with a processing mode of tool rotational type using a cutter 1 having a cutting blade 4, coolant is injected from a coolant injection nozzle 7 which is opened at an opposite position to the cutting blade 4. The power due to processing which is going to thrust back the cutting blade 4 to an opposite direction against a cut-in direction (a radius enlarging direction) load is offset with the thrust accompanying the above-mentioned coolant injection, and a reduction in processing accuracy of the reverse tapered hole is prevented.
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