To select a vibration waveform suitable for cutting work of microfine deep holes or the like from among a large number of vibration waveforms.
When performing the cutting work of a workpiece by applying vibration between a cutting tool and the workpiece, a vibration waveform defined by a cutting time ratio Rc or a positive velocity time ratio Rv is used as the vibration waveform for use in driving an actuator for applying vibration. The cutting time ratio Rc represents the percentage of a cutting time to all drive time, and a smaller ratio is better. Preferably, when selecting the vibration waveform in which a minimum value of the cutting time ratio Rc in an amplitude ratio of 10 or less becomes 0.28 or less, the time when a cutting edge of a drill 10 is separated from the workpiece 12 becomes long, and thereby the cooling of the cutting edge can be expected. The positive velocity time ratio Rv represents a ratio of time in which the vibration velocity to the cutting time becomes positive, and a larger ratio is better. Preferably, when selecting a vibration waveform in which a maximum value of the positive velocity time ratio Rv in an amplitude ratio of 10 or less becomes 0.80 or more, the reduction of the cutting resistance can be expected.
OCHIAI KAZUHIRO
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