Influence Of Surface Topography On Friction And Wear Characteristics Of Connecting Rod Bushing

The surface topography has a close relationship with the fiction characteristics and wearcharacteristics, studying the friction characteristics by changing surface topography to becomea focus of scientific research in recent years. The surface topography of engine connecting rodbushing is not only a direct impact on the wear resistance, corrosion resistance, sealing, butalso on the overall performance of equipment, parts and equipment service life, vibration andnoise. Therefore, the design and control of surface topography, is one of the basic measures toextend the service life of the machine and improve the performance and efficiency.In order to better control the friction characteristics of the connecting rod bushing in theworking conditions, the researchers have done a lot in the connecting rod bushing materialsand lubrication, but they consider less the impact of the surface topography on the fiction andwear characteristics . In the environment of the same lubrication conditions, this paper studiedthe influence degree of the surface topography by using different material connecting rodbushing to obtain a higher scientific value.In the article the following works was studied:(1) The definition and significance of the number of surface topography parameters wereanalyzed Firstly. This paper selected the part of the common functional parameters to analyzein a large number of two-dimensional surface morphology characterization parameters, whichis based on the asperity contact and lubrication. It was extracted from the parameters oflongitudinal, transverse parameters, comprehensive parameters and functional parameters. Itnot only can help to analyze the influence of the connecting rod bushing surface topographyon friction characteristics, but also contribute to the optimization of the manufacturing ofsurface topography. Stylus profilometer measured the surface morphology parameters ofconnecting rod bushing, and draw two-dimensional original surface topography. (2) By conducting connecting rod bushing friction characteristics test, it obtained theimpact law of the speed, load, lubrication on the friction characteristics, drawing thecorresponding velocity and load curve. The same time, it conducted the endurance test toinspect the influence of friction distance.It concluded that the topography of rod rushing wasrelated to the topography of hard surface ,it has nothing to do with their initial topography.(3)Because a number of surface topography parameters has a different influence on thefriction characteristics, the study of the impact degree of different surface topographyparameters became very important .This paper used MATLAB neural network toolbox andMIV screening parameters to program which considered the sensitivity of the surfacetopography parameters to the coefficient of friction as program evaluation benchmark, theseparameters were sorted by importance, the same time it choose six parameters which had agreater impact on the friction characteristics as the key basis of the surface topography design.It lay the foundation to improve the friction characteristics for the future by changing thesurface topography of connecting rod bushing.(4) We analyze of friction and wear characteristics of the connecting rod bushing ofdifferent materials.It used three different materials such as QSn7-0.2, QAl9-4-4-2,Hpb59-1,QSn10-1to conduct the friction characteristics test, and measured the surfacetopography again by stylus profilometer after the test, recorded the data, and compared withthe original surface topography to examine the surface topography changes, which laid thedata foundation for surface morphology parameters in the next chapter. Trial found the tin thebronze QSn7-0.2 bushing has a good anti-friction wear resistance.