表面织构对高速插针机构导轨的表面摩擦性能影响OACSTPCD

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.