Study on typical metal fatigue failure of circuit breaker operating mechanism unit

International Conference on Manufacturing Technology, Materials and Chemical Engineering

机械制造;材料科学;化学工业

Feng, Chao^1 ; Xie, Yi^1 ; Wang, Jun^1 ; Li, Dengke^1 ; Chen, Wei^1 ; Li, Wenbo^1 ; Ouyang, Kejian^1

State Grid Hunan Electric Power Company Limited, Research Institute, Changsha

410007, China^1

关键词: Alternating stress;    Connecting bolts;    Failure features;    Macroscopic examination;    Metallographic examination;    Operating mechanism;    Operations management;    Technical supervision;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/392/2/022026/pdf
DOI  :  10.1088/1757-899X/392/2/022026

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Circuit breaker operating mechanism unit endure alternating stress during divide-shut brake operation, and metal components frequently appear fatigue failure. In the paper, the common failure features of energy storage spring facture, shaft sleeve cracking, energy storage connecting bolt cracking were studied. Depending on this situation, macroscopic examination, metallographic examination, scanning electron microscope were applied. The results indicated that the metal components fatigue failure were mainly caused by bad material and inproper installation. Technical supervision suggestion were also proposed to perfect the construction acceptance and operations management process.