Four stages of rolling bearing failure and preventive measures
The first stage is the embryonic stage of bearing failure. At this time, the temperature is normal, the noise is normal, the total vibration velocity and spectrum are normal, but the total peak energy and spectrum have signs. In the second stage, the temperature is normal, the noise increases slightly, the total vibration velocity increases slightly, and the vibration spectrum does not change significantly, but the peak energy increases greatly, and the spectrum is more prominent. In the third stage, the temperature rises slightly, the noise can be heard, the total vibration velocity increases greatly, and the bearing fault frequency and its harmonics and sidebands are clearly visible on the vibration velocity spectrum. In addition, the noise level on the vibration velocity spectrum increases significantly. In the fourth stage, the temperature rises significantly, the noise intensity changes significantly, the total vibration velocity and the total vibration displacement increase significantly, the bearing fault frequency on the vibration velocity spectrum begins to disappear, and is replaced by a larger random broadband high-frequency noise; the total peak energy increases rapidly, and some unstable changes may occur. Preventive measures: Do a good job of bearing maintenance at ordinary times, lubricate and pretighten regularly, clean the environment around the bearing, and avoid dust and debris from being involved in the bearing. Professionals should regularly monitor and record key indicators such as temperature, noise, vibration speed, etc. of rolling bearings under working conditions. Once an abnormality occurs, the machine should be stopped immediately and the bearings should be disassembled for inspection. If obvious wear is found, new bearings should be replaced in time.
