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在车轴的车轮配合表面的端部,有时会产生微细的金属疲劳损伤。新干线的车轴是在转向架全面检查大修时,将车轮拆下后进行配合部位的磁粉探伤检查的。为了减少检修费用,将不拆车轮检查作为一项措施,进行了以提高超声波斜角探伤的精度来检测微细损伤的探伤方法的基础研究。研究结果表明,采用能够发射超声波强波束的聚焦探头,探伤时在与车轮配合的部位施加油压以减少杂波(压入反射波),能够探测出轮座处深0.05mm、长1mm、宽
At the end of the wheel fitting surface of the axle, fine metal fatigue damage may occur. Shinkansen axle is in the bogie a comprehensive inspection overhaul, the wheels removed after the cooperation with the site of magnetic particle inspection. In order to reduce maintenance costs, we did not dismantle the wheel inspection as a measure and conducted basic research to improve the ultrasonic flaw detection accuracy to detect the micro flaw detection method. The results show that using a focusing probe capable of transmitting a strong beam of ultrasonic waves, oil pressure is applied to reduce the clutter (press-in reflected waves) at the position matching with the wheel during the inspection, and the depth of the wheel seat at the depth of 0.05 mm, the length of 1 mm,