Transducer to detect force which is applied to machine tool when

Details Transducer to detect force which is applied to machine tool when Transducer to detect force which is applied to machine tool when

1989-02-28

1990-05-15

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to multiple loads or load components

73104, 7386268, G01L 516, G01L 116, B23Q 1709

Patent

active

049247131

ABSTRACT:
A cutting load or a cutting resistance which is applied to a machine tool is detected by using a transducer having a film sheet type piezoelectric sensor. A detection output of the transducer is converted into a voltage signal by a charge amplifier. The transducer is attached to the portion of a feed nut which is moved in the axial direction by a screw shaft, and the cutting load is applied to the transducer. On the other hand, the transducer may be assembled in the portion of the bearing which supports the feed screw shaft so as to detect the cutting load which is applied to the screw shaft. Further, the transducer may be assembled integrally with the tool holder. In order to prevent a drift which occurs in the output of the charge amplifier since a constant assembly load is applied to the transducer having the piezoelectric sensor, two transducers are provided so that the cutting loads are applied in opposite directions to the transducers and the inverted output of one of two charge amplifiers is added to the output of the other charge amplifier.

REFERENCES:
patent: 3464503 (1969-09-01), Houck
patent: 3872285 (1975-03-01), Shum et al.
patent: 4499394 (1985-02-01), Koal
patent: 4577510 (1986-03-01), Bur et al.
patent: 4741231 (1988-05-01), Patterson et al.
patent: 4807482 (1989-02-01), Park et al.

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