Method and apparatus for discriminating cutting state from non-c

Details Method and apparatus for discriminating cutting state from non-c Method and apparatus for discriminating cutting state from non-c

1985-08-07

1987-04-14

Levy, Stewart J.

Measuring and testing

Vibration

By mechanical waves

340680, 408 11, 409194, 83 72, 5116575, B23Q 1500, B23Q 1712

Patent

active

046568689

ABSTRACT:
An apparatus for discriminating a machining state from a non-machining state in a machine tool wherein a workpiece is machined with a cutting tool or grinder, comprising plural vibration sensors including at least one acoustic-emission sensor, which detect vibrations of different frequency bands, respectively, which are produced during machining of the workpiece by the tool. A discriminating device judges that the workpiece is being machined by the tool when levels of output signals generated from at least two of the vibration sensors are higher than respective predetermined threshold levels, and judges that the workpiece is not being machined by the tool when the level of an output signal generated from less than two of the vibration sensors is higher than a predetermined threshold level. Also disclosed is a method for discrimination between the machining and non-machining states.

REFERENCES:
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patent: 4332161 (1982-06-01), Kakino
patent: 4413507 (1983-11-01), Drew et al.
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patent: 4441103 (1984-04-01), Urabe
patent: 4507705 (1985-03-01), Hoshino et al.
patent: 4558311 (1985-12-01), Forsgren et al.

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