Study On Bionic Non-smooth Surface Of Friction Pair Of Low Speed And High Torque Hydraulic Motor

As one of the key friction pairs in the low-speed and high-torque hydraulic motor,the valve plate can be easily operated in seawater with low viscosity,poor lubricity,high gasification pressure and strong corrosive effect.Corrosion,wear and tear and other reasons failure,seriously affected the low-speed high-torque hydraulic motor of the normal work and life.The main methods of improving and improving the corrosion resistance and wear resistance are to adopt new materials,new technology,new structure design and to improve the hardness and surface coating of materials.However,it is very difficult to further improve the wear resistance of materials.Smooth surface effect to improve the friction of the lubrication,viscosity reduction,resistance and wear resistance has great potential.In the study of the baffle plate with bionic non-smooth surface,the research contents include the following aspects:(1)In the low-speed high-torque sea-fresh water hydraulic motor,the full hydrodynamic lubrication model of the bionic non-smooth surface end-face with different opening shape and cross-sectional shape was established,and CFD(Computational Fluid Dynamics)Shape and cross-sectional shape on the internal liquid flow and its influence on hydrodynamic lubrication performance.(2)In the low-speed high-torque sea-fresh water hydraulic motor,the full-hydrodynamic lubrication model of the bionic non-smooth surface end face with different shapes and pit shapes was established.Fluent software was used to simulate the liquid film surface pressure distribution and compare the liquid film surface Bearing capacity of the low-speed and high-torque hydraulic motors.The different pit and pit depths are analyzed for the low-speed and high-torque hydraulic motors.Bearing capacity.(3)The non-smooth elements with different shapes were machined on the surface of the PEEK sample by micro-engraving technique.The MMD-5A multifunctional friction and wear tester was used to form the pair of 316 L stainless steel.The effect of bionic non-smooth surface on the tribological properties of 316L-PEEK pair under seawater lubrication conditions was investigated by comparing the experimental results.(4)Based on the dimension of the friction test and the dimension of the nonsmooth structure,a non-smooth surface plate model was established.The friction and wear properties of the ANSYS / LS-DYNA non-smooth surface plate model were analyzed by finite element method.The reliability of the simulation results is verified by comparing the dynamic friction coefficient obtained by the friction and wear test with the contact stress of the specimen with the numerical simulation.