| 摘要 |
PURPOSE:To make full use of a fact that a reflecting mode of ultrasonic waves differs so remarkably due to the presence of tool breakage and thereby detect this tool breakage automatically, by installing an ultrasonic transmitter in a position proximate to the drilling part of a workpiece and also an ultrasonic receiver in the symmetrical position. CONSTITUTION:An ultrasonic transmitter 5 is installed in a position promixate to a drilled part 3 of a workpiece 2 by a drill 1 while an ultrasonic receiver 6 in the symmetrical position, respectively. Next, a driving control part 7 driving and controlling the ultrasonic transmitter 5 is electrically connected to the ultrasonic receiver 5. In addition, an arithmetic and control part 10, which stores an electric signal SA indicating breakage state of the drill 1 and discriminates between a normal waveform and an abnormal waveform is also electrically connected to the ultrasonic receiver 6. And, a display part 11 displaying the drill breakage detected result is connected to the arithmetic and control part 10. A waveform of this device becomes formed as in 9 if the drill 1 is broken, and since it differs from a normal waveform 8, detection accuracy is improved. |
