Study On A Skidding Damage Test RIG For High-Speed Rolling Bearings

With the progress of science and technology and the development of society, the spindles of machines are required to rotate faster and faster, even their speed can reach to tens of thousands revolutions per minute. Skidding damage is one of the main failures for high speed rolling bearings. However it is difficult to predict the skidding damage of high speed rolling bearings, using the existing theories of kinematics and dynamics analysis, as well as simulation analysis methods. Therefore, effective guidance can’t be provided from the theories to analyze the failure mechanism of skidding damage and to help the design of bearings. In order to investigate the failure mechanism of skidding damage by experimental methods, a skidding damage test rig for high speed rolling bearings is developed in this paper.According to the analysis of running conditions of high speed rolling bears and functional requirements of the experimental system, the overall scheme of the test rig is determined. Driving the test bearing by a high speed spindle, combining a high temperature lubricating system and a vibration exciter, the harsh actual running conditions with high speed, high temperature and vibration of high speed rolling bearings are simulated. Adjusting the test parameters of this test rig, such as speed, load, vibration signal and temperature of lubricating oil, the influence of running conditions on slip of the test bearing can be investigated by detecting the difference between the speed of the inner ring and that of the cage. And then the influence of slip on skidding damage can be analyzed by detecting the vibration signal and characterizing the contacted surfaces of the test bearing. The modularization design method is employed on the structural design of the test rig, which includes base structure, shafting, driving system, lubricating system, loading system, exciting system, etc.The modeling of the test rig is achieved using the CAD software UG, and the FEA analysis of the shafting structure is carried out employing the software ANSYS Workbench. The stiffness and strength the driving shaft is checked by static analysis. The vibration mode and critical rotating speed of the spindle are obtained by modal analysis, which can prevent the occurrence of resonance by avoiding the resonance frequency. Based on the modal analysis, the dynamic response analysis of shafting is realized to get the dynamic response of the spindle under different incentive.Finally, the measurement and control system of the test-rig is established using the software LabVIEW. The appropriate hardware equipment is selected according to the performance requirements of the measurement and control system. The measurement and control system is simulated using the virtual instrument technology, in which the signals of test parameters of the test bearing, such as rotating speed, temperature, load, as well as vibration are collected and analyzed, and then they are outputted in the form of curves or diagrams. The running situation of the test bearing is monitored by measuring and controlling the test parameters through the measurement and control system, which ensures normally operating of the test rig.