Patent ID: 9211624
Filing Date: 2015-12-15
Classification: B23Q

Abstract:
1. A vibration determination method for determining a type of chatter vibration occurring in a rotary shaft in a machine tool that has the rotary shaft rotating a tool or a workpiece comprising: a first step for detecting time-domain vibration of the rotary shaft and rotation speed of the rotary shaft during rotation; a second step for calculating frequency-domain vibration based on the time-domain vibration, and obtaining a plurality of peak values and peak frequencies corresponding to each of the plurality of peak values in the calculated frequency-domain vibration; a third step for obtaining a synchronizing type vibration range for determining the type of the chatter vibration using the peak frequencies correspond to each of the plurality of peak values; and a fourth step for determining whether the type of the chatter vibration is a forced chatter vibration of a synchronizing type vibration based on a relation between the peak frequencies and corresponding peak values and the synchronizing type vibration range obtained using the peak frequencies.