Study On Tribological Technology And Performance On Micro-textured Surface Of Rolling Bearing Couple

The rolling bearing called the mechanical joint is an important part of the mechanical equipment to support the rotation of the shaft parts.With the rapid development of modern science and technology,the traditional lubrication method has been difficult to meet the lubrication requirements of rolling bearings under special working conditions.In order to improve the tribological performance of rolling bearing and prolong the service life,the paper adopted the composite treatment which contained laser texturing and coating technology under rolling bearing and studied its tribological performance and lubrication mechanism under oil lubrication.Primarily,the paper regarded the cylindrical roller bearing in oil lubricated conditions as the research object.Through the establishment of the lubrication theory of cylindrical roller bearing analysis model,the finite difference method is used to discretize the equations of cylindrical roller bearing and solve the surface of the oil film pressure distribution and analyze the effect of micro texture geometry parameters on cylindrical roller bearing surface.Then,the laser texturing technology is studied and the influence of pulse repetition times and monopulse energy on the diameter and depth of micro pits is studied.Secondly,the influence of the surface texture parameters of M50 NiL bearing steel under the condition of oil lubrication and the factors such as load and rotational speed on the performance of the friction pair are studied.Finally,the surface of M50 NiL bearing steel were textured and coated.The influence of the texture density,load,speed and other parameters on the rolling friction properties are studied.The paper studied different surface treatments on the effect of rolling friction properties and studied the anti-friction resistance mechanism of the micro texture coating and obtained the following conclusions:(1)With the increase of load and speed,roller bearing surface textures of the oil film average dimensionless pressure increases.When the diameter of micro texture is 80 um and the depth is 8um,increased gradually with the area ratio,the average dimensionless pressure of the oil film shows a tendency to increase first and then decrease.(2)The pulse repetition frequency has a great influence on the micro indentation depth,increasing linearly with pulse repetition frequency.Single pulse energy has a great influence on the micro diameter,increasing with single pulse energy.(3)Under the condition of oil lubrication,the rolling friction coefficient of the friction surface decreases first and then increases with the increase of the texture density.When the texture density is 15%,the effect of antifriction is best.The rolling friction coefficient of the friction surface decreases first and then increases with the increase of texture depth.When the texture depth is 8 um,the coefficient of friction is the smallest.It decreases gradually and tends to be stable with the increase of the load and finally tends to be stable gradually increased with the increasing of speed.(4)Under the condition of oil lubrication,the rolling friction coefficient of the textured coating decreases first and then increases with the increase of the texture density.When the texture density is 10%,the effect of antifriction is best.The rolling friction coefficient gradually tends to be stable with the increase of the load and tends to be stable gradually increased with the increasing of speed.Compared with smooth,non lubricated,textured surfaces without lubrication,oil lubrication on the coating surface and textured surface oil lubricated samples,the oil lubricated specimens on textured coating have better anti-friction property.