自润滑杆端关节轴承的摩擦性能研究

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The friction coefficients, wear depths and friction temperatures of four kinds of rod end spherical plain bearings with liners at different oscillating frequencies are investigated by using a high oscillating frequency and heavy load tribo-tester. With the help of scanning electron microscope（SEM） , the differences of worn surfaces of the four rod end spherical bearings are compared and analyzed. The experimental results show that the tribological property of bearing with PTFE liner is the best in the four kinds of bearings, followed by the bearing with a nylon liner which its heat conductivity and heat stability are better than the others, and the tribological property of bearing with copper base powder metallurgy liner is worst. At 3 Hz and 16 MPa, the bearing with nylon liner is slightly worn, while the bearing with PTFE liner is slightly spalled and worn, the bearing with bronze liner shows serious abrasive wear and fatigue wear, and the bearing with copper base powder metallurgy liner has adhesive wear on it.利用自制高频重载杆端关节轴承摩擦磨损试验机，研究了不同摆动频率下，尼龙、PTFE、青铜、铜基粉末冶金4种衬垫材料杆端关节轴承摩擦系数、线磨损量和摩擦温度的变化规律；借助扫描电子显微镜（SEM）对比分析了4种杆端关节轴承衬垫材料的磨损表面。试验结果表明：PTFE衬垫轴承的摩擦学性能最优，其次是尼龙衬垫轴承，并且其热传导性和热稳定性较好，铜基粉末冶金衬垫轴承的摩擦学性能最差；在3．0Hz和16MPa条件下，尼龙衬垫轴承为轻微磨损，PTFE衬垫轴承为轻微剥落磨损，青铜衬垫轴承为严重的磨粒磨损和疲劳磨损，铜基粉末冶金衬垫轴承为粘着磨损。