Multi-level tool break detection using multi-mode sensing

Details Multi-level tool break detection using multi-mode sensing Multi-level tool break detection using multi-mode sensing

1989-03-27

1990-04-17

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340683, 73104, 73660, G08B 2100

Patent

active

049184270

ABSTRACT:
A system and method for monitoring machine tool operations provides a multi-level tool break alarm and uses information from multiple sensors of different types. Signal processing and pattern recognition logic techniques are applied to a cutting process high frequency vibration signal to detect major tool breaks requiring prompt stoppage of the cut. False alarm resistant detection of minor tool breaks, for which the response may not be an immediate stop of the cutting process, is obtained with information from a low frequency vibration sensor, an axis drive current sensor, or an axis velocity sensor. A minor tool break alarm is generated when signal transients in both a high frequency and low frequency channel signal are in close time coincidence, and a major alarm when the high frequency channel transient is followed by a persisting mean vibration level shift.

REFERENCES:
patent: 4636779 (1987-01-01), Thomas et al.
patent: 4636780 (1987-01-01), Thomas et al.
patent: 4831365 (1989-05-01), Thomas et al.
S. R. Hayashi et al, "Automatic Tool Touch and Breakage Detection in Turning", Sensors '85, Detroit, SME.

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