Vibration determination method and vibration determination device

摘要

Determination of chatter vibration is done for a plurality of peak values that appears when frequency-domain vibrational acceleration is obtained through fast Fourier analysis on time-domain vibrational acceleration. In machining at a low rotation speed and machining using a tool with small flute number in particular, a type of chatter vibration that has occurred can be accurately determined, and “natural type vibration” occurring due to friction between a tool and a workpiece and an impact force caused by machining can also be determined.

主权项

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.