| 摘要 |
PURPOSE:To rapidly perform non-destructive measurement, by providing a transmitter and a reciver to the side and front surfaces of a roll and calculating the max. position of sensitivity of the receiving ultrasonic wave of the receiver to measure the hardened depth of the roll on the basis of the calculated position. CONSTITUTION:An ultrasonic wave is incident on a roll at an incident angle theta1 from a transmitter 3 and transmitted therethrough at sound velocity v1 over the radius direction distance l1 of the roll usual part and refracted at the interface to be transmitted through a part having a hardened depth l2 at a refracted angle theta' and sound velocity v2 to be allowed to reach a receiver 4. After the position of the transmitter 3 and the incident angle theta1 were determined, the receiver 4 is measured from the reference position P1 of the roll side surface in the roll axis direction and, by detecting the max. sensitivity position P2 at this time, operation is performed according to a predetermined calculation formula and the depth thickness l2 of a hardened layer can be determined. |
