受电弓弓头支架碳滑板安装座裂纹分析及改进设计

Crack Analysis and Improvement Design of Carbon Slide Mounting Seat of Pantograph

文章针对动车组在运行过程中,受电弓弓头支架碳滑板安装座在交变载荷的作用下产生疲劳裂纹的问题开展研究.对故障件进行化学成分测试及金相组织分析,结果表明化学成分及金相组织符合相关标准.仿真分析了碳滑板安装座在运行过程中的受力状况,碳滑板安装座受到弓网交变动态力的长期持续作用,引发疲劳裂纹.改进弓头支架结构,取消碳滑板安装座焊接连接方式,采用铝合金整体折弯成型结构.仿真分析得出新结构有效降低了碳滑板安装座受到的集中疲劳应力,进而提高受电弓弓头支架的使用寿命.

Fatigue crack of carbon slide mounting seat of pantograph under alternating load is studied.Chemical composition test and metallographic structure analysis were carried out,the results show that the chemical composition and metallographic structure meet the relevant standards.The stress state of the carbon slide mounting seat during the running process is simulated and analyzed.The structure of the pantograph head bracket is improved and the new structure eliminates the welding connection of the mounting seat of the carbon slide plate and adopts the integral bending of aluminum alloy.Simulation analysis shows that the new structure can effectively reduce the concentrated fatigue stress and improve the service life of the pantograph head bracket.