Method guide for detection and temperature measurement of FAG super-precision bearings

Bearing monitoring All changes that can reflect the FAG precision bearing or any kind of change under operating conditions can be used as a measurement value for bearing monitoring. They can be forces, but also vibrations, temperatures, driving forces, etc. In the process of bearing monitoring, it is not important to always ensure the absolute value of the measured value, but the possible change of the monitored value is more important. For example, an absolute temperature of 40 C will not damage rolling bearings. If this steady state temperature goes from decelerating 35 C to 40 C in a short period of time, then this may be a clear sign that the bearing is starting to damage. When selecting a monitoring method, consideration should be given to whether the bearing damage will gradually increase at low or medium speeds over a long period of time. In these cases, regular monitoring makes sense. At high and very high speeds, natural failures should also be included in the risk assessment, only then can bearing damage be reduced under continuous monitoring. In the past, bearing monitoring was only used to ensure the quality of newly machined or repaired spindles. For example, reduced downtime or natural frequency measurements are areas of consideration. During these two processes, problems caused by preloading are detected quickly and accurately. The measurement of temperature, vibration velocity and acceleration is a common method used for quality assurance. These methods can only be used for comparable processes, such as the measurement of reduced deceleration downtime. Temperature monitoring In many cases, temperature is important to the running performance of the bearing. Generally speaking, the aging or failure of grease lubricated bearings can be detected in time. Changes in preload lead to the failure of bearing float, which has a relatively stable correlation with temperature changes. Generally, the temperature is measured on a stationary ferrule, usually the outer ring. It is based on the temperature change within a certain period of time. The following are guidelines for reliable temperature measurement: Measure as close to the bearing as possible Measure continuously as possible Avoid bearing deformation due to measuring forces The normal bearing temperature pattern is steady-state. However, if the service life of the grease is exceeded, the temperature changes will be very unstable with high and low changes. When bearing performance begins to degrade, corresponding measures must be taken.