以插针机中具有表面织构的导轨摩擦副为研究对象,考虑表面粗糙度、载荷波动、速度变化、时变油膜挤压效应等因素,分析表面织构对其摩擦性能的影响.应用计算机模拟生成具有自相关函数的粗糙表面,将Greenwood和Tipp建立的粗糙度接触模型以及Patir和Cheng修正后的平均油膜流体润滑模型耦合构建混合摩擦模型,通过MATLAB软件计算出凸轮的1个转动周期内的每个时刻的油膜压力、微凸体压力、油膜厚度.分析了混合润滑阶段摩擦副的油膜压力分布特点,以及织构数量、表面粗糙度、表面织构尺寸参数对摩擦副润滑特性的影响.结果表明:当底座摩擦副粗糙度方差增大时,油膜压力随之减小;微型凹坑半径取60 μm,面积占有比取40％,微型凹坑深度取5 μm时摩擦副取得最优润滑效果.
Taking the rail friction pair with surface texture in the pin insertion machine as the research object,the influence of surface texture on its friction performance was studied with the consideration of surface roughness,load fluctuation,speed fluctuation,and time-varying oil film extrusion effect.A rough surface with autocorrelation func-tion was generated by computer simulation,and the mixed friction model was constructed by coupling the roughness contact model established by Greenwood and Tipp and the average oil film fluid lubrication model modified by Patir and Cheng.The oil film pressure,asperity contact pressure and oil film thickness at each moment in a cam rotation cycle were calculated by MATLAB software.The characteristics of the oil film pressure distribution of the friction pair in the mixed lubrication stage were analyzed,and the effects of texture quantity,surface roughness,and sur-face texture size parameters on the lubrication characteristics of the friction pair were obtained.The results showed that when the variance of the roughness of the friction pair of the base increased,the oil film pressure decreased.When the radius of the micro-dimples was 60 μm,the area occupation ratio was 40％,and the depth of the micro-dimples was 5 μm,the friction pair could achieve the best lubrication effect.
王星龙;陶宗杰;杨泊莘;安琦
华东理工大学机械与动力工程学院,上海 200237泰科电子(上海)有限公司,上海 200030
机械工程
插针机构;导轨;表面织构;混合摩擦;表面粗糙度
pin insertion mechanism;guide rail;surface texture;mixed friction;surface roughness
《郑州大学学报（工学版）》 2024 (001)
40-46 / 7
上海市设计学Ⅳ类高峰学科资助项目(DA17014)
10.13705/j.issn.1671-6833.2024.01.006
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