To provide a wear detecting method capable of simply and reliably detecting the wear of a cutting tool for cutting a very small component.
The cutting sound in a cutting machine is detected by a microphone 11, and the frequency component in a predetermined range including the natural frequency of the cutting tool 2 out of the cutting sound is discriminated by a filter 12 and taken out. If the taken-out signal level is not less than a preset value, the cutting tool 2 is determined to be worn. Since only the frequency components in the predetermined range including the natural frequency component of the cutting tool are taken out, the effect of the noise such as the motor noise in a factory can be excluded, and only the frequency components related to the wear of the tool 2 can be detected. Thus, even only the cutting sound is detected, the wear of the cutting tool 2 can be simply and reliably detected.
MATSUHISA KAZUHIRO
ITAO KIYOSHI
ITO TATSUJI
MIZUTANI KAZUO
