Study On Water Lubrication Characteristics And Wear Reduction Mechanism Of Textured Reciprocating Friction Pairs

The relative movement of the mechanical surface causes wear and tear,which leads to the failure of the operation of the mechanical equipment.However,it is difficult to form a lubricating oil film with water as the medium,which cannot play a good effect.This paper focuses on the wear reduction effect of surface texture treatment of reciprocating friction pair under water lubrication.According to the different texture morphology,size parameters and the wear reduction effect of its array arrangement under different friction conditions.The purpose is to solve the problem of friction and wear of reciprocating motion pair and improve the service life of mechanical parts.The main contents of this paper are as follows:(1)The dynamic lubrication mathematical model of the texture element in the reciprocating friction pair was established by using the classical Reynolds equation and N-S equation.The formation mechanism of texture dynamic pressure lubrication was investigated.The dynamic lubrication effect of spherical crown,semi-ellipsoid and conical texture based on Reynolds equation was verified by MATLAB software.The cavitation mechanism and cavitation boundary conditions are analyzed.The validity of the lubrication equation in the study of textured dynamic pressure lubrication is discussed.The N-S equation was established and each variable was dimensionless treated.The lubrication model of the textured friction pair was solved.(2)The phenomenon that the oil film bearing capacity produced by the spherical crown,semi-ellipsoid and conic texture with the same pit radius and depth is obviously different is investigated.The pressure distribution law of pits with different morphologies and textures was analyzed.The effects of textured pit volume ratio and texture morphology on the wear reduction performance of the textured friction pair were investigated.It is concluded that spherical crown texture can produce higher surface bearing capacity under the same parameters.At the same texture radius and volume ratio of 7%to 9%,the texture has better wear reduction performance.When the ratio of the maximum depth of texture to the friction pair clearance is less than 1,the texture with smaller volume ratio can produce higher bearing capacity.When the ratio of the maximum depth of texture to the gap between the friction pairs is greater than 1,the texture with a larger volume ratio produces a higher bearing capacity.(3)The effect of texture array arrangement on lubrication and wear reduction performance was studied.Taking spherical coronal texture as the research object,the influence of uniform texture with different dislocation angles on pressure distribution and bearing capacity is analyzed.The change of the surface bearing capacity generated by a single texture array with the change of working conditions was studied.At the same time,the influence of variable-array texture array on the surface bearing capacity was studied.It is concluded that the surface bearing capacity produced by the square texture is the largest,The larger the proportion of large diameter texture and deep texture at both ends,the greater the bearing capacity is.The parameters of the texture array should not vary too much.The best bearing capacity can be obtained by the array composed of two different sizes of texture pits.(4)Friction and wear exploratory tests of textured reciprocating friction pairs were carried out.The processing method and test device of textured reciprocating friction pair specimen are introduced.The test scheme was set up and the tribological test was carried out.The wear reduction effect of surface texture treatment in actual working conditions is analyzed.It is verified that the texture treatment of the friction pair surface can produce wear reduction effect in the practical application process.The friction coefficient of the textured surface decreases first and then increases with the increase of the motor speed.The increase of the working load will make the friction coefficient of the specimen surface decrease.By numerical comparison,the wear reduction rate is 25.34%when the texture diameter is 1000μm and the depth is 100μm,which has the best wear reduction effect.Figure[71]Table[7]Reference[79]...