Detection of tool breaks that cause slowly decreasing cutting no

Details Detection of tool breaks that cause slowly decreasing cutting no Detection of tool breaks that cause slowly decreasing cutting no

1986-03-03

1987-11-17

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340683, 73104, 73660, G08B 2100

Patent

active

047076887

ABSTRACT:
Vibrations at the cutting tool-workpiece interface are sensed and the accelerometer output is preprocessed to yield a cutting noise vibration signal. Digital analysis of the sampled signal is performed to detect a gradual cutting noise signal level decrease tool break signature, either continuously decreasing or decreasing in a series of small abrupt steps. A tool break alarm is generated, without false alarming on metal-to-air tool path transitions, as the mean cutting noise signal level falls below an upper check limit and, after a preset time has elapsed, crosses a lower check limit.

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S. R. Hayashi et al., "Automatic Tool Touch and Breakage Detection in Turning", Sensors '85, Nov. 5-7, 1985, Detroit.

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