60Si2MnA制动器回位弹簧断裂机理研究  

Research on the fracture mechanism of 60Si2 MnA return spring of a brake

作　　者：杨玲玲[1] 韩明[1] 任毅如[2] 刘守河 YANG Ling-ling;HAN ming;REN Yi-ru;LIU Shou-he(China North Vehicle Research Institute,Beijing 100072,China;College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]中国北方车辆研究所,北京100072 [2]湖南大学机械与运载工程学院,长沙410082

出　　处：《车辆与动力技术》2020年第4期30-33,43,共5页Vehicle & Power Technology

基　　金：工信部国防基础产品创新科研项目(237099000000170008)。

摘　　要：对60Si2MnA制动器回位弹簧断裂失效的问题进行了研究,对弹簧断口及其成分进行了分析,建立了考虑损伤的弹簧有限元模型,对典型工况下的弹簧应力状态进行了研究.结果表明,回位弹簧弯钩在加工时的表面损伤是裂纹扩展源,导致回位弹簧断裂失效.回位弹簧弯钩型式应选择应力集中较小的圆钩环,加工时应避免弹簧钢丝弯曲过程中对钢丝表面的损伤,回位弹簧氧化前应增加磁粉探伤检查.The fracture failure mechanism of the return spring was studied.The failure surface and its composition have been analyzed.The spring finite element model considering damage was established to investigate the stress under typical working conditions.The results show that the surface damage of the spring hook during manufacturing is the source of crack propagation,which causes the fracture failure of the return spring.The round hook ring should be used due to less stress concentration.The damage to the steel wire surface should be avoided in the manufacture process of spring steel wire bending,and magnetic particle inspection should be performed before oxidation of return spring.

关 键 词：制动器 回位弹簧 失效分析 氧化缺陷 

分 类 号：U463.5[机械工程—车辆工程]