| 摘要 |
PROBLEM TO BE SOLVED: To decide whether allowable or not by causing an impeller to generate a stress similar to an actual using condition in the middle of an ultrasonic flaw detection inspection, inspecting a growth condition of a defect before and after it, and calculating signs of growth. SOLUTION: A sample impeller 1 and a positioner 2 are provided in a water tank 3, and ultrasonic wave from an ultrasonic wave generating device 4 is made incident to the impeller 1 through a probe 5, with an arm 6 of a robot controlled by a robot control device 7, a relative position of the probe 5 to the impeller 1 is controlled to move a to be probed surface. Based on a detection signal of the echo, position and size are recorded with an analysis device 10. To a load applying device 11 which is inserted between vanes of the impeller 1, operating oil is supplied from a hydraulic power source 14 through a piping 12 and a servo valve 13. The load is controlled with a load control device 15. After loading specified repeated load, position and size of a defect of the same place are recorded again with the device 10. By comparing them with the last one, it is confirmed whether the defect have grown or not. |
