High-speed Rail Bearing Testing Machine With Bearing Cooling Test Analysis

In the localization process of high-speed bearings, bearing test is an indispensablepart of the manufacturing process and design for bearing. In order to complete theexperimental tasks in various bearing working condition by high-speed rail bearingtesting machine, there is a higher request on the stability of the working state of theimportant support components–steady bearing. Much friction heat will generate whenthe testing machine on condition of high speed heavy duty work. The stability of themachine spindle will be influenced when steady bearing temperature rise too high. Forsolving the heating problem of steady bearing, the mechanism of heating and coolingpattern are analyzed in this paper. The main factors effect on the bearing heating arediscussed, and the effective cooling way of steady bearing is further studied, to reducethe temperature when the steady bearing on condition of high speed heavy duty workand improve the reliability of bearing use.The steady bearing of high-speed rail bearing testing machine is taken as theresearch object in this paper. The bearing selection is completed. The influencingfactors of bearing heating, the thermal mechanism and internal heat transferation areanalyzed. The finite element model of supporting system is established, and thetemperature distribution of supporting system and steady bearing is analyzed. At thesame time, the groove cooling system on the steady bearing support is designedaccording to the structure characteristics of bearing system. Then, the improvement ofthe cooling groove structure is realized and the improved structure is stress analyzed,to ensure the supporting strength.The heat dissipation pipes simplified mathematical model of temperature fieldanalysis is established using numerical differential method. Based on the heat transferprinciple, and the nusselt number and the surface heat transfer coefficient of the flowfield with the change of different parameters is obtained through the cooling pipe flowfield velocity and temperature distribution law are calculated and analyzed. In order to further study the cooling mechanism of steady bearing, the change rule of fluid inletvelocity, the influence of initial temperature and physical parameters effect on heattransfer is discussed through the establishment of a complete finite element simulationcalculation of pipeline fluid convection model.The simulation experiment of heat flow field dissipating was carried out tovalidate the consistency of the theory analysis and simulation results to ensure thereliability of law of the theoretical calculation and analysis, and the data reference forthe design of high-speed rail bearing test-bed is offered at the same time.After a lot of theoretical analysis and simulation in this paper, explores themethods to improve the cooling performance of steady bearing. Research results showthat: the groove cooling system on the steady bearing support can effectively reducethe temperature rise of steady bearing, and water cooling effect is more obvious thanoil; then simply improve the fluid inlet velocity has no effect on the convective heattransfer performance significantly When fluid inlet velocity reaches a certain value.The performance of the convective heat transfer can be significantly improved byreducing fluid initial temperature appropriately.