Tool life detection device and tool life detection method

摘要

PROBLEM TO BE SOLVED: To provide a tool life detecting device and a tool life detecting method capable of detecting the life of a machining tool including chipping with high accuracy. As shown in FIG. (A), a vibration sensor 13 is attached to a spindle 12 and along a feeding direction of a machining tool 21. The vibration information obtained by the vibration sensor 13 is amplified by the amplifier 14 and sent to the calculation unit 15. The calculation unit 15 calculates the Mahalanobis distance based on the vibration information. At the time of this calculation, a sample line parallel to the processing time axis is drawn on the waveform curve obtained from the vibration information, and the number of intersections where the waveform curve and the sample line intersect is used as the amount of change, and the sample line segmented by the waveform curve. The sum of the line segments of is used as the abundance amount, and the amount of change and the abundance amount are used to calculate the distance of Maharanobis. As a result, the figure (b) is obtained. [Effect] In FIG. (B), since the MD value in the boundary region is remarkably large with respect to the normal region, an abnormality (lifetime) can be detected at a preferable timing. [Selection diagram] FIG. 12