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1前言在新干线电力动车的定期检查中，要进行车轴超声波探伤检查，针对300系空心轴开发的自动超声波探伤机，使探伤实现了自动化。在0．100系的实心轴的探伤作业中，由于探头采用手工操作，回波也由目测判定，所以，希望开发如300系那种能自动探伤、自动判定的探伤机。为此，从
1 Foreword In the regular inspection of the electric power train in the Shinkansen, it is necessary to carry out the inspection of the axle ultrasonic inspection and to develop the automatic ultrasonic testing machine for the 300 series hollow shaft so that the testing can be automated. In 0.100 series of solid shaft flaw detection operations, the probe manually by hand, the echo is also visually determined, it is hoped to develop such as 300-series that can automatically detect, automatic detection of flaw detection machine. To this end, from