Patent ID: 9285797
Filing Date: 2016-03-15
CPC Classification: B23Q,G05B,Y10T

Claim Text:
1. A regenerative chatter vibration detection method for detecting regenerative chatter vibration, the regenerative chatter vibration occurring when a tool having a cutting edge is attached to a rotary spindle and this tool is moved relative to a workpiece to machine the workpiece, comprising: a data acquiring step of acquiring vibration data, which has a correlation with vibration of the tool at a time of machining the workpiece, at a predetermined sampling period; a calculating step of calculating an autocorrelation function corresponding to a time required for the rotary spindle to rotate at least twice so that the cutting edge contacts the workpiece several times based on time series vibration data acquired by the data acquiring step, and calculating a period or frequency of characteristics of the calculated autocorrelation function; and a deciding step of deciding that the regenerative chatter vibration occurs when a contact period at which the cutting edge contacts the workpiece is not an integral multiple of the period calculated by the calculating step or when the frequency calculated by the calculating step is not an integral multiple of a product of a number of cutting edges of the tool and a rotational speed of the rotary spindle.