| 摘要 |
PROBLEM TO BE SOLVED: To make increasable the feeding mount of a material per one rotation to tow times of an effective beam width by providing one channel with two gates for detecting flaw on both of inner and outer surfaces, and changing the flaw detecting allocation of the channel. SOLUTION: The flaw of a material to be detected having an outer diameter ϕof approximately 13-95 mm, and a thickness of below 20% of the outer diameter, such as bearing general steel, stainless alloy steel, tool steel or the like is detected by using a flaw detector having an effective beam width of a probe of approximately 5 mm, and the frequency of probe of approximately 4 MHz. One channel is provided with two gates, and the flaw on inner and outer surfaces of a material to be detected, is detected by the clockwise flaw detection and the anticlockwise flaw detection by the probe. C1, C3 indicate the clockwise flaw detection, and C2, C4 indicate the anticlockwise flaw detection of the inner and outer surfaces. The flaw detection is allocated to each channel, and a feeding amount of the material 1 per one rotation can be increased by two times of an effective beam width of the probe. |
