| 摘要 |
PURPOSE:To detect an extremely small defect in a ball speedily and securely by mounting the ball on driving rollers consisting of two rollers, and rotating the two rollers and thus rotating the ball. CONSTITUTION:When the ball (c) for the structure member which has a diameter DC is mounted on the two driving rollers 30 formed by combining two spherical parts (a) and (b) having diameters DA and DB, contacts between the spherical surfaces (a) and (b) and the ball (c) are denoted as A and B. When the roller 30 rotates at a rotating speed N, the ball (c) rotates at a rotating speed (n), but the ball is to rotate at peripheral speeds VA and VB equal to the ratio of the diameters DA and DB at the points A and B, so the ball (c) generates a force F because of the difference between the peripheral speeds VA and VB. The ball (c), therefore, shifts in its rotational center axis X while rotating in a constant direction. Then, a probe fitting part is equipped with a mechanism which rotates around the ball (c) about the center axis of the rotary surface of the ball (c) and then the flaw detecting inspection of the entire peripheral surface of the ball (c) is carried out automatically. An ultrasonic wave transmission medium can use water, turbine oil, etc. |
