Acoustic monitoring of cutting conditions to detect tool break e

Details Acoustic monitoring of cutting conditions to detect tool break e Acoustic monitoring of cutting conditions to detect tool break e

1984-10-24

1987-01-13

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340683, 73104, 73660, G08B 2100

Patent

active

046367802

ABSTRACT:
This tool break detection system relies on monitoring changes in the cutting noise itself, rather than detecting the tool fracture acoustic signal. A broken tool capable of damaging the workpiece is detected, and tool break events that do not affect cutting conditions are ignored. The signal from a sensor such as an accelerometer is preprocessed to attenuate low frequency machinery noise and detect the signal energy in a band below 100 KHz, then sampled, and the digitized signal samples analyzed by pattern recognition logic. Runout false alarms during rough surface cutting are prevented; after detection of an abrupt increase or decrease in signal level, the confirmation period to test for a persistent shift in mean level is set longer than the workpiece revolution period.

REFERENCES:
patent: 3793627 (1974-02-01), Darrel et al.
patent: 3842663 (1974-10-01), Harting et al.
patent: 4087801 (1978-05-01), Noh
patent: 4332161 (1982-06-01), Kakino
patent: 4413507 (1983-11-01), Drew et al.
patent: 4471444 (1984-09-01), Yee et al.
patent: 4514797 (1985-04-01), Begin

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