Research On The Effect Of Surface Micro-topography Of Frictional Pair On Its Performance Based On Fractal Geometry

There are many valuable information that can be researched in the microscopic geometry of friction surfaces.Research on the friction surface/interface has become a key research direction for scholars at home and abroad.At the same time,the measurement and characterization of the surface is an indispensable link between the function of the link surface and the surface processing technology.It can realize the quantitative control of the processing technology and the accurate prediction of the use performance.In this paper,the effect of surface microscopic geometry of friction pair under different processing methods on its performance is discussed.Two-axis diameter test pieces of electrochemical finishing and grinding finishing are used to measure the surface and collect surface information respectively.The oil film thickness and rotor vibration were measured using a sliding bearing oil film thickness test platform.In order to investigate the influence of the surface microscopic geometry of the friction pair on the dynamic pressure effect of the oil film,based on the experimental data,fractal geometry was used to study and create the surface microscopic morphology of electrochemical finishing and grinding.Surface simulation was performed with software such as MATLAB to establish a fluid medium gap model of the friction pair,and FLUENT software was used to simulate and simulate the hydrodynamic pressure effect.Research results:(1)The microscopic geometrical morphology of the friction pair formed by different finishing methods is also different,which has a crucial influence on the sealing and lubrication performance of the part.(2)Experimental results show that the average oil film thickness formed on the surface of electrochemical finishing is 6% higher than that of grinding,and the average vibration amplitude of the rotor is reduced by 7%.(3)Compared with grinding,electrochemical finishing uses the modification of the surface micro-geometry to increase its regularity to change the distribution of micro-dynamic pressure effects,resulting in a stronger dynamic pressure effect,More stable and thick oil film thickness.Research conclusions:(1)The microscopic geometry of friction surfaces can create dynamic pressure effects.Compared with grinding,electro-chemical finishing processes can improve the regularity of micro-geometry and improve the degree of regularization.The strong and weak distribution of dynamic pressure effects.(2)The pressure field existing in the friction table/interface is the result of the integration of the microscopic dynamic pressure effect,while the result of the transfer gives the pressure field a fluctuating characteristic.Compared with the grinding process,the surface of the electrochemical finishing process can be strengthened.The dynamic pressure effect improves the stability of the fluctuation of the pressure field,which is conducive to drag reduction,down grinding and vibration reduction.(3)The pressure field existing in the friction subsurface/interface can be regarded as the result of the pumping action of a large number of tiny volumetric pumps composed of the surface microscopic geometry,and the occurrence of fatigue pitting and vibration on the surface of the friction pair.influences.(4)Reasonably selecting the processing method and designing the processing quality according to the use performance is an important development direction of the future part design and manufacture.It is important to generate the drag reduction,reduction grinding and vibration reduction functions by means of the microcosmic geometric shape of the part surface and its unevenness.Research content.