Detector to discriminate between tool break acoustic signatures

Details Detector to discriminate between tool break acoustic signatures Detector to discriminate between tool break acoustic signatures

1986-05-05

1987-11-17

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340683, 73104, 73660, B08B 2100

Patent

active

047076879

ABSTRACT:
In some machining conditions the background noise in an acoustic cutting tool break detection system is a low mean level with fairly dense high amplitude noise spikes. A common tool break vibration signature is the sudden appearance of a dense spiky noise. Digital signal pattern recognition logic uses an up/down counter to reject the noise on the basis of its lower spike density while alarming on such a tool break signature. Preprocessed vibration signal samples are tested against a detection threshold and an alarm generated if those whose amplitude is above the threshold amplitude exceeds those below by a preset count.

REFERENCES:
patent: 4636779 (1987-01-01), Thomas et al.
patent: 4636780 (1987-01-01), Thomas et al.
patent: 4642617 (1987-02-01), Thomas et al.
S. R. Hayashi et al., "Automatic Tool Touch and Breakage Detection in Turning", Sensors '85, Nov. 5-7, 1985, Detroit.

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