| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for boring a hole of a large diameter with the low surface roughness of a profile and high quality using a drill of a long service life at a relatively short machining time, even if a drill spindle of a high maximum rotational speed is used. SOLUTION: Step-Dwell machining for repeating a step for inserting a drill to continue boring after the standby of a predetermined time at the time of drawing the drill is used for a conventional step machining. When a standby time is not provided, because the torque of the drill spindle with a high maximum rotational speed is low, a time is required for recovering the rotational speed decreased by cutting resistance, so that a short time for descending and ascending the drill spindle is not enough for the recovery or reduction of a cutting temperature. COPYRIGHT: (C)2004,JPO
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