Study On Electrochemical-mech Finishing Of Bearing Roller

High stress concentration happens on both sides of the rollers, also the inner and outer raceway generating lines, when cylindrical roller bearing is in a state of being loaded. The stress concentration mentioned above often leads to further development of fatigue collapse and breakingoff toward to the core, which could make the entire bearing fail. This plays an important role in the decaying of the bearing life.The design of crowning roller, which changes the direct bus of roller to crowning bus, can effectively improve the stress distribution of rolling contact zone. At present, the developed countries require the cylindrical, tapered roller to be with crowning profile. So it becomes very important to do research into the design of crowning roller. By means of finite element method software ANSYS, the design of roller with logarithmic profile has been done. Through the comparison of stress distribution of contact zone under different loads, finally get a more reasonable crowning profile and crowning metric.At the same time, the surface roughness of bearing roller has a great influence on the bearing life. The lower roughness can reduce the friction coefficient, noise and improve the precision of rotation. Research has proved that electrochemical mechanical finishing can improve the surface roughness greatly. This paper presents ECM-mech finishing of bearing roller, designs and manufactures a set of ECM-mech finishing equipment including power supply, recycle system of electrolyte, roller motion system, grinding device, cathode feeding device and so on. The influence of technologic parameters, such as speed of workpiece, electric current density, pressure of belt, granularity of belt and processing time have been researched primarily by orthogonal experiment, which provide the foundation for optimization of technological parameters. Finally experiments analysis shows that ECM-mech finishing can improve the surface quality and reduce the surface roughness greatly. The method is simple, practical and easy to operate.Then design and manufacture a crowning cathode, consider electric current density and processing time as the main parameters to do the experiment of crowning rollers. The results shows that ECM-mech finishing can not only reduce the surface roughness greatly, but also get the crowning profile.