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论述新干线电车车轴轮座的微振磨蚀对策;变更车轮内轮毂端的悬伸及车轮座端圆角部半径。通过将车轴制成悬伸形状,以使圆角半径由100mm变为60mm的方击,大大降低了因微振磨蚀而引起的磁粉裂纹的发生率。轮座上发生的磁粉裂纹的深度平均为0.07mm左右,最大为0.2mm左右,此裂纹停止。作为裂纹停止不变的最大因素是由于在表面感应淬火部存在残余压应力层。最后,作为维修作业省力化项目之一,对用在车轮压装配合状态下的探伤方法取代以往的磁粉探伤法正在进行研究,并且对中空心车轴超声波探伤法及SH波探伤法作了介绍。
Discusses the vibration countermeasures of the axle seat of the Shinkansen tram; changes the overhang of the wheel hub end and the radius of the wheel seat fillet part. By making the axle into an overhanging shape so that the corner radius is changed from 100mm to 60mm, the incidence of magnetic particle cracks caused by fretting erosion is greatly reduced. The depth of the magnetic crack occurred on the wheel seat averaged about 0.07mm, a maximum of about 0.2mm, the crack stop. As the biggest factor of stopping the crack, the residual compressive stress layer exists in the surface induction hardening part. Finally, as one of the labor-saving projects for maintenance work, the magnetic particle inspection method that is used in the state of press fitting with the wheel is replaced by the conventional magnetic particle inspection method, and the ultrasonic inspection method and the SH wave detection method of the hollow axle are introduced.