Research Progress of Tribological Properties and Life Estimation Methods of Self-Lubricating Spherical Plain Bearings
HAN Cuihong1,2,3, SHI Jiadong1,3, LIU Yunfan3, LIU Qian3, MA Guozheng3, LI Guolu1, WANG Haidou3
1 School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, China 2 School of Mechanical Engineering, Tianjin University of Technology and Education, Tianjin 300200, China 3 National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China
Abstract: Since self-lubricating spherical plain bearings during service work are characterized by simple structure, impact resistance, corrosion resis-tance, wide temperature range, long life, maintenance-free, and no need to add lubricants, etc., they are widely used in aerospace, hydropower, military machinery and other industries. Meanwhile, with the need of cutting-edge, precision and large-scale equipment, people have paid more attention to the tribological performance, service life and reliability requirements of self-lubricating spherical plain bearings. The performance of self-lubricating materials used in self-lubricating spherical plain bearings directly determines the life and performance level of the bearings. Therefore, research on the performance of self-lubricating materials has become a key issue to solve the quality and life of self-lubricating spherical plain bearings. Nowadays, self-lubricating materials are roughly divided into three types, metal-backed layered composite materials, polymers composite materials and PTFE fiber textile composite materials. However, problems of the self-lubricating material effect the use rang, such as the tribology pro-perties, the bonding method and the design of the texture. Therefore, researchers have selected appropriate fibers, nano-metal particles and PTFE for compounding, which greatly improved the tribological properties of PTFE. At the same time, the structure and twisting method of the self-lubricating materials are researched and optimized. Researchers have studied problems such as the wear failure mechanism and static contact problems during bearing service life through bearing wear test and finite element simulation. The study found that the formation of solid lubricating film is essential of PTFE fiber fabric with good lubricity and wear resistance. The wear types of self-lubricating spherical plain bearings are mainly adhesive wear, abrasive wear and a little fatigue wear. For life prediction and reliability analysis of self-lubricating spherical plain bearings during service life, researchers developed various bearing life tester and established many bearing life estimation models based on wear rate. Referenced engineering experience and working conditions on bearing life, a series of bearing life formulas were derived. According to bearing accelerated tests, bearing wear life distribution functions can be obtained, then the reliability analysis of bearings can be realized. This review takes PTFE fiber fabric material as discussion object, and summarizes the effects on self-lubricating spherical plain bearings’ wear behavior such as the components, weave structure, and materials bonding properties, etc. The film formation mechanism and wear mechanism during bearing service life, as well as the development of self-lubricating spherical plain bearing life tester and research methods are referred. According to the analysis of the bearing life estimation and reliability research, the urgency of establishing corresponding standards and test specifications for life evaluation of self-lubricating spherical plain bearings is pointed out. And the necessity of life reliability research on self-lubricating spherical plain bearings is essential.
韩翠红, 石佳东, 刘云帆, 刘倩, 马国政, 李国禄, 王海斗. 关节轴承自润滑材料摩擦学性能及轴承寿命预测研究现状[J]. 材料导报, 2021, 35(5): 5166-5173.
HAN Cuihong, SHI Jiadong, LIU Yunfan, LIU Qian, MA Guozheng, LI Guolu, WANG Haidou. Research Progress of Tribological Properties and Life Estimation Methods of Self-Lubricating Spherical Plain Bearings. Materials Reports, 2021, 35(5): 5166-5173.
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