CHATTER VIBRATION DETECTION METHOD, CHATTER VIBRATION AVOIDANCE METHOD, AND MACHINE TOOL

摘要

The vibration data of a tool (4) that is processing a workpiece is obtained with a predetermined sampling period (?t). Based on the obtained time-sequence vibration data, an autocorrelation coefficient (Rxx') of a time required for cutting blades (4a, 4b) to contact a workpiece (W) a plurality of times is calculated. The cycle (Tx) of the characteristic of the calculated autocorrelation coefficient (Rxx') is also calculated. When the contact cycle (T1) when the cutting blades (4a, 4b) contact the workpiece (W) is not an integral multiple of the calculated cycle (Tx), it is determined that chatter vibration has occurred.