Failure analysis and factors influencing spline wear in hydraulic motors of charging pumps in nuclear power plants

doi:10.1016/j.engfailanal.2023.107780

IMR OpenIR

	Failure analysis and factors influencing spline wear in hydraulic motors of charging pumps in nuclear power plants
	Liu, Xing 1; Xu, Dezhong 1; Lin, Jiahui 1; Zhang, Long 1; Zeng, Yinping 1; Chen, Qiang 2,3,4
通讯作者	Chen, Qiang(rcachen@163.com)
	2024-02-01
发表期刊	ENGINEERING FAILURE ANALYSIS
ISSN	1350-6307
卷号	156 页码:25
摘要	Metallographic analysis techniques such as optical microscopy and scanning electron microscopy were used to observe the morphology of spline wear, confirming the presence of fretting wear characteristics. Microstructural analysis of spline cross sections using a metallographic micro-scope revealed surface carburization treatment on the splines. Hardness tests conducted from the surface to the core of the splines showed a gradual decrease in hardness, consistent with the observed microstructural features. The chemical composition of the spline was analyzed using a spectrometer, and the main component content was analyzed.By combining finite element analysis techniques, this study analyzed the effects of factors such as forces, eccentricity, and lubrication on spline wear. The results indicated that the varying degrees of spline wear in the hydraulic motors of charging pumps in the on-site conditions of the nuclear power plant were primarily attributed to differences in spline eccentricity after manu-facture and assembly. Further investigation revealed that the fundamental cause of spline wear in hydraulic motors was the operation of the equipment under conditions deviating from the rated operating points, resulting in poor circulation of oil within the motors and insufficient spline lubrication. Specifically, operating the equipment at lower pressures and away from the rated operating points resulted in reduced oil flow velocity, increasing the friction between the spline mating surfaces. The poor lubrication of the spline and eccentricity are the primary reasons for spline wear, and the combination of these two factors exacerbates spline wear. To address the wear issue of the hydraulic motor, we replaced it with a linear-axis hydraulic motor and con-ducted a comprehensive analysis of the linear-axis hydraulic motor. The results indicate that the linear-axis hydraulic motor can effectively reduce wear, and after testing at the nuclear power plant, it meets the operational time requirements on-site.These findings offer valuable guidance for the maintenance and operation of charging pumps in nuclear power plants, facilitating the prevention of similar issues and enhancing equipment reliability and operational efficiency.
关键词	Spline Fretting wear Cause analysis Numerical simulation
资助者	Chief Special Fund of China General Nuclear Power Group - Charging Pump
DOI	10.1016/j.engfailanal.2023.107780
收录类别	SCI
语种	英语
资助项目	Chief Special Fund of China General Nuclear Power Group - Charging Pump[R-2021SZME04TF]
WOS研究方向	Engineering ; Materials Science
WOS类目	Engineering, Mechanical ; Materials Science, Characterization & Testing
WOS记录号	WOS:001123795100001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/177190
专题	中国科学院金属研究所
通讯作者	Chen, Qiang
作者单位	1.China Nucl Power Operat Co Ltd, Major Equipment Management Off, Shenzhen 518000, Peoples R China 2.Suzhou Nucl Power Res Inst Co Ltd, Shenzhen 518000, Guangdong, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China 4.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Liu, Xing,Xu, Dezhong,Lin, Jiahui,et al. Failure analysis and factors influencing spline wear in hydraulic motors of charging pumps in nuclear power plants[J]. ENGINEERING FAILURE ANALYSIS,2024,156:25.
APA	Liu, Xing,Xu, Dezhong,Lin, Jiahui,Zhang, Long,Zeng, Yinping,&Chen, Qiang.(2024).Failure analysis and factors influencing spline wear in hydraulic motors of charging pumps in nuclear power plants.ENGINEERING FAILURE ANALYSIS,156,25.
MLA	Liu, Xing,et al."Failure analysis and factors influencing spline wear in hydraulic motors of charging pumps in nuclear power plants".ENGINEERING FAILURE ANALYSIS 156(2024):25.