| 摘要 |
PURPOSE:To reduce the acceleration applied to a mechanism part and eliminate play due to the acceleration, and perform flaw detection stably by putting plural probes and their holding member in circular motion and a material to be inspected in relative linear motion, and making a scan by their composite motion. CONSTITUTION:When a flaw of a hoop plate material is detected with an ultrasonic wave, the material 1 to be inspected is dipped in water while piercing a water tank 3, and when a rotating shaft 11 is rotated, a rotary ring 9 rotates to put respective probes 4a, 4d- mounted on the ring 9 in constant-speed circular motion. Simultaneously, when the material 1 to be inspected is moved continuously at a constant speed as shown by an arrow, the probes 4a, 4b- scan drawing cycloidal curves, which are as many as the proves and at equal pitch over the entire surface of the material 1 to be inspected. Consequently, a constant-speed scanning for flaw detection on the entire surface of the material 11 to be inspected is made without any discrimination between the center part and edge parts. |
