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    基于正交试验研究自润滑衬垫摩擦磨损性能

    Research on Friction and Wear Properties of Self-Lubricating Liner by Orthogonal Experiment

    • 摘要: 以聚四氟乙烯(PTFE)/芳纶(Nomex)纤维混合编织型自润滑衬垫为研究对象,选取压力(50,100,150 MPa)、往复频率(0.1,0.3,0.5 Hz)、温度(20,71,163 ℃)三个因素设计正交试验方案,通过矩阵分析法研究了压力、往复频率、温度及其交互作用对自润滑衬垫摩擦磨损性能的影响。结果表明:50 MPa低压力条件下衬垫以表层树脂磨损为主,100 MPa中压力条件下衬垫除存在表层树脂磨损外,还存在PTFE纤维与Nomex纤维的磨损,150 MPa高压力条件下衬垫表层树脂被快速碾压破碎,PTFE纤维与Nomex纤维断裂;摩擦因数随着压力的增加或温度升高先减小后增大,随着往复频率的增加而增大,体积磨损率随着压力的增加而增大,随着往复频率的增加而减小,随着温度的升高先增大后减小;影响衬垫摩擦因数和体积磨损率的主次因素依次为压力、往复频率、温度;当压力为100 MPa、往复频率为0.5 Hz、温度为20 ℃时,摩擦因数与体积磨损率的综合值最小。

       

      Abstract: With the polytetrafluoroethylene (PTFE)/aramid (Nomex) fiber mixed woven self-lubricating liner as the research object, pressure (50, 100, 150 MPa), reciprocating frequency (0.1, 0.3, 0.5 Hz) and temperature (20, 71, 163 ℃)were selected to design the orthogonal experiment scheme. The influence of pressure, reciprocating frequency, temperature and their interaction on the friction and wear properties of self-lubricating liner was studied by the matrix analysis method. The results show that under 50 MPa low pressure condition, the liner experienced mainly surface resin wear. Under 100 MPa medium pressure condition, in addition to the surface resin wear, there were also wear of PTFE fibers and Nomex fibers. Under 150 MPa high pressure condition, the surface resin of the liner was rapidly crushed and fragmented, and the PTFE and Nomex fibers underwent fracture. The friction coefficient first decreased and then increased with the increase of the pressure or temperature, increased with the increase of the reciprocating frequency. The volume wear rates increased with the increase of the pressure, decreased with the increase of the reciprocating frequency, and first increased and then decreased with the increase of the temperature. The factors affecting the friction coefficient and volume wear rate of the liner were ranked in descending order of influence as follows: pressure, reciprocating frequency and temperature. The minimum combined value of friction coefficient and volume wear rate was achieved at a pressure of 100 MPa, a reciprocating frequency of 0.5 Hz, and a temperature of 20 ℃.

       

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