| MATERIALS AND SUSTAINABLE DEVELOPMENT: MATERIALS REMANUFACTURING AND WASTE RECYCLING |
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| Research Status of Life Test and Damage Failure Mechanism of Self-lubricating Spherical Plain Bearings |
| LIU Yunfan1,2, QIN Hongling1, HAN Cuihong2,3, SHI Jiadong2,3, MA Guozheng2, WANG Haidou2
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1 College of Mechanical & Power Engineering, China Three Gorges University, Yichang 443000, China
2 National Key Laboratory for Remanufacturing, Army Armored Academy, Beijing 100072, China
3 School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300000, China |
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Abstract Self-lubricating spherical plain bearings have many advantages, such as simple and compact structure, maintenance-free, no need to add lubricant, etc., and have become an important basic moving part widely used in aerospace equipment and industrial equipment. At present, many developed countries in the aerospace industry including the United States, France, Germany, and Britain had conducted comprehensive research on self-lubricating spherical plain bearings for a long time, and formed a complete standard system of spherical plain bearings. However, the domestic research on self-lubricating spherical plain bearings started late, and the application research technology of self-lubricating spherical plain bearings in high-precision industrial fields was approaching a blank, especially in basic researches such as service life prediction and failure mechanism exploration of spherical plain bearings were very weak.
In recent years, with the continuous improvement of the service performance and life of self-lubricating spherical plain bearings in the field of high-precision, the study on the evolution of the life of self-lubricating spherical plain bearings and the mechanism of damage failure had been highly valued. The researchers found that the wear failure of the self-lubricating liner/coating was the most important reason for the failure of the self-lubricating spherical plain bearings. Self-lubricating spherical plain bearings often faced unusually harsh working conditions such as heavy load, high frequency, high and low temperature cycles, strong oxidation, and strong radiation during service. Whether the damage failure mechanism had changed and how to improve the bearing life prediction model to improve the life prediction accuracy had become a research hotspot.
At present, relevant researchers had designed accelerated life tests using the swing frequency and load as the acceleration stress respectively, which had improved the efficiency of the self-lubricating spherical plain bearings, and the parameter change in the Weibull distribution was used as the basis for judging the change of the spherical plain bearings failure mechanism, which greatly enhanced the accuracy of the spherical plain bearings life prediction model. At the same time, the domestic and foreign scholars had conducted research on the failure mechanism of liner and part of coated self-lubricating spherical plain bearings, and revealed the film formation mechanism and wear failure mechanism of the surface of the friction pair of the liner self-lubricating spherical plain bearings under different working conditions. And found that the use of ultrasound, chemical solutions and other surface modification methods could improve the tribological properties of the pad to a certain extent, and increase its service life.
In this review, firstly, the current research status of self-lubricating spherical plain bearing life test was summarized, and the equipment, stan-dards and methods of spherical plain bearing life test were mainly discussed. Then, the failure mechanism of self-lubricating spherical plain bea-ring damage was analyzed. The failure mode and failure criterion of self-lubricating spherical plain bearings were briefly introduced. The main factors affecting the damage of self-lubricating spherical plain bearings were analyzed by comparing the performance of self-lubricating materials, the quality of friction surface processing and the service conditions. Finally, the key research directions of self-lubricating spherical plain bearing life test and failure mechanism were prospected.
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Published: 19 January 2021
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| Fund:This work was financially supported by the National Natural Science Foundation of China(51905533), the Pre-Research Program in National 13th Five-Year Plan (61409230603, 61409220205) and the Joint Fund of Ministry of Education for Pre-research of Equipment for Young Personnel Project (6141A02033120). |
About author:: Yunfan Liu received his B.E. degree in Changchun University. He is currently pursuing his M.S. at the College of Mechanical & Power Engineering of China Three Gorges University under the supervision of Prof. Hongling Qin. His research interests include tribology and surface engineering.
Guozheng Ma received his B.E. degree in Northwes-tern Polytechnical University in 2008 and received his M.S. and Ph.D. degrees in National Key Laboratory for Remanufacturing at Academy of Armored Forces, China, in 2010 and 2014, respectively. And then, he joined the National Key Laboratory for Remanufacturing. He is supported by Yong elite scientists sponsor ship program by CAST. He is currently an associate researcher and master tutor. His research interests include surface engineering, remanufacturing and tribology. |
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2021, Vol. 35 
