Ultrasonic sensor for on-line detection of cutting tool insert f

Details Ultrasonic sensor for on-line detection of cutting tool insert f Ultrasonic sensor for on-line detection of cutting tool insert f

1996-10-24

1998-07-07

Oda, Christine K.

Measuring and testing

Vibration

Sensing apparatus

73629, 7386206, G01N 2922

Patent

active

057772312

ABSTRACT:
An on-line ultrasonic sensor for monitoring and sensing failure in a cutting tool insert. The preferred embodiment of the sensor includes a piezoelectric film of aluminum nitride (AlN) deposited onto a tool insert or tool insert seat with the AlN film electrically connected to a signal generator and detection circuitry. A voltage pulse is applied to the AlN film to generate ultrasonic signal pulses in the AlN film which are transmitted through a tool insert to the vicinity of the cutting edge of the tool insert during use. Back-reflected ultrasonic signals from the edge of the tool insert induce a voltage signal in the piezoelectric film which is analysed and compared to signals characteristic of undamaged tool inserts. Temperature increases, wear and various types of tool failure can be readily detected during use of the insert with the sensor.

REFERENCES:
patent: 4927300 (1990-05-01), Ramalingam
patent: 5461923 (1995-10-01), Meisterling

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