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1 问题的提出转8A型转向架用制动梁滚子轴裂纹一直是车辆部门惯性顽症之一。列车提速后,此类故障呈明显上升趋势。以秦皇岛车辆段为例,2001年1月～12月,段修检查时共发现滚子轴裂纹611件,统计资料见表1。其中,由滚子轴与闸瓦托焊接的2条焊缝部位延伸的裂纹(以下简称焊缝延伸裂
1 PROBLEM PROBLEM Turning the beam bogie beam cracking of a type 8A bogie has been one of the inertial chronic diseases of the vehicle sector. After the train speed, such failure showed a clear upward trend. In Qinhuangdao depot, for example, January 2001 ~ December, Duan Xiu inspection found a total of 611 roller shaft cracks, statistics in Table 1. Among them, by the roller shaft and brake watts welding two parts of the weld cracks (hereinafter referred to as the weld cracks