表面粗糙度改善磁流变阻尼器密封副摩擦学性能的试验研究  

Experimental Study of Surface Roughness on Improving the Tribological Performance of Sealing Pairs in Magnetorheological Fluid Damper

作　　者：李姗姗[1] 孙兴伟[1] 乔赫廷[1] 赵文曾 刘寅 任霞 LI Shanshan;SUN Xingwei;QIAO Heting;ZHAO Wenzeng;LIU Yin;REN Xia(School of Mechanical Engineering,Shenyang University of Technology,Liaoning Shenyang 110870,China;China Machine Test Equipment Co,Ltd,Jilin Changchun 130103,China)

机构地区：[1]沈阳工业大学机械工程学院,辽宁沈阳110870 [2]中机试验装备股份有限公司,吉林长春130103

出　　处：《摩擦学学报(中英文)》2025年第3期386-396,共11页Tribology

基　　金：国家自然科学基金项目(52005346,51505298);辽宁省教育厅面上项目(JYTMS20231191)资助.

摘　　要：利用自制试验装置与高速往复摩擦磨损试验机模拟磁流变阻尼器密封副非线性磨损行为,通过与参考介质甲基硅油环境下形成的摩擦系数时变曲线对比分析,揭示磁流变液工况下表面粗糙度对密封副摩擦学性能的影响.此外,在动力学特性分析的基础上对密封副磨损表面采用扫描电镜和能谱仪进行分析,探究密封副在磁流变液工况下的磨损机制.结果表明:密封副在2种试验介质下的摩擦系数曲线变化形成了鲜明的对比,常规液压系统推荐的表面粗糙度参考范围已不再适合作为磁流变阻尼器密封系统的设计准则.具体地说,磁流变液环境下粗糙样本展现出较低的摩擦系数和材料磨耗,磨损机制主要以三体磨粒磨损为主;而抛光样本对应的曲线波动剧烈且磨损严重,磨损机制主要以两体磨粒磨损为主.经数据拟合方式得到的优化样本T_(opt)(R_(opt)=3:2μm)在密封磨损试验研究中展现出良好的减摩特性和抗接触疲劳特性,揭示了配副表面粗糙度与悬浮铁粉平均粒径接近时有助于改善密封磨损性能,为延长磁流变装置密封系统使用寿命提供参考依据.During the reciprocating dynamic sealing process,hydroxy iron powders suspended in magnetorheological fluid(MRF)enter the sealing interface under the combined action of hydrodynamic pressure and shear forces,which accelerating the friction and wear between piston rod and O-ring,eventually leading to the sealing leakage.This seriously endangers the working performance and even lifespan of magnetorheological damper.A self-made test device and a high-speed reciprocating friction wear testing machine were used to simulate the wear behavior of sealing pairs in magnetorheological damper.Through comparing the time-varying curve of friction coefficient formed in the reference medium methyl silicone oil,the influence of surface roughness on the tribological performance of sealing pairs under magnetorheological fluid is revealed.It should be pointed out that methyl silicone oil was the carrier fluid for the preparation of magnetorheological fluid and did not contain any particles.The purpose of choosing methyl silicone oil as the experimental benchmark in this article was to highlight the effect of hydroxy iron powders on the wear mechanism of sealing pairs.The results showed that the friction coefficient curves of sealing pairs under two experimental media were in sharp contrast,and the surface roughness reference range recommended by conventional hydraulic system was no longer suitable for the design criterion of magnetorheological damper sealing system.Specifically,the rough sample in magnetorheological fluid exhibited lower friction coefficient and material wear,which was mainly caused by three-body abrasive wear.While the curves corresponding to polished sample fluctuated sharply and wear seriously,primarily dominated by two-body abrasive wear.Moreover,the optimized sample T_(opt)(σ_(opt)=3:2μm)obtained by the data fitting method showed excellent anti-friction characteristics and anti-contact fatigue properties.It revealed that the surface roughness of piston rod was close to average particle size in suspended iron

关 键 词：磁流变液 表面粗糙度 摩擦系数 摩擦学性能 往复密封 

分 类 号：TH117.1[机械工程—机械设计及理论]