| abstract |
The present invention relates to an ultrasonic flaw detection method on a cylindrical surface, a flaw detection device, and a grinding method of a roll using the same, wherein when detecting an ultrasonic damage by using a surface wave, it is possible to prevent overdetection of primary cracks, The purpose of the present invention is to reduce the level of noise and improve the defect detection ability. Specifically, the ultrasonic vibrator 10A is provided to the surface wave probe 10 that transmits and receives the surface wave during the ultrasonic flaw detection of a hot rolling roll using the surface wave. Resin wedge 10C provided on the ultrasonic wave transmitting and receiving surface of the substrate and damping material 10B provided on the rear surface thereof, and having a pulse width of 2.5 times or shorter than the wavelength of the surface wave, and generating a short pulse. Supply the medium liquid, determine the grinding amount according to the reflected wave height, and grind the roll, and search for damage while partially grinding the roll to optimize the roll grinding amount. The is characterized in that to obtain. |