Tool break detecting method and system preventing false alarms d

Details Tool break detecting method and system preventing false alarms d Tool break detecting method and system preventing false alarms d

1988-01-13

1989-07-18

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

73104, 73660, 340680, G08B 2100

Patent

active

048497410

ABSTRACT:
Substantial cutting condition changes which occur in intermittent bursts as rough surfaced workpieces are turned generate specific vibration signal signatures known as the runout condition. Either an upper or a lower threshold is set and all mean signal samples are compared with the threshold value. When the mean cutting noise exceeds the upper threshold or stays below the lower threshold for a preset number of signal samples, a tool break alarm is generated. Techniques are given to reduce false alarms on runout during initial rough surface cuts. The system comprises an accelerometer or other sensor whose signal is processed to attenuate lower frequency machinery noise and to detect the signal energy in a band below 100 kHz, then sampled, and the digitized signal samples analyzed by pattern recognition logic.

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.
patent: 4656868 (1987-04-01), Azuma et al.
patent: 4707687 (1987-11-01), Thomas et al.
Hayashi et al., "Automatic Tool Touch and Breakage Detection in Turning", General Electric Company, Technical Information Series, No. 85 CRD 097, pp. 1-11 (Jun. 1985).

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