Bearing monitoring Any change that reflects the FAG precision bearing or any change in operating conditions can be used as a measurement for bearing monitoring. They can be forces, vibrations, temperatures, driving forces, and the like. In the process of bearing monitoring, it is not always important to ensure that the absolute value of the measured value is large, and the possible change of the monitored value is even more important. For example, an absolute temperature of 40 °C will not damage the rolling bearings. If this steady-state temperature rises from a deceleration of 35 °C to 40 °C in a very short period of time, this may be an obvious sign of the bearing starting to suffer damage. In selecting the monitoring method, it should be considered whether the bearing is gradually worsened after a long time when the bearing is damaged at low speed or medium speed. In these circumstances, it makes sense to conduct regular monitoring. At high speeds and at extremely high speeds, natural failures should also be included in the risk assessment. Only in this way can the bearing damage be reduced with continuous monitoring.
The previous bearing monitoring was only used to guarantee the quality of newly processed or repaired spindles. For example, reducing downtime or measuring natural frequencies is a consideration. In both processes, the problems caused by preloading are quickly and accurately detected. Measurements of temperature, vibration velocity, and acceleration are common methods for quality assurance. These methods can only be used for comparable processes, such as reducing the measurement of deceleration downtime.
Temperature Monitoring In many cases, temperature is important for bearing performance. In general, aging or failure of a grease-lubricated bearing can be detected in time. The preload changes cause the bearing to float and have a relatively stable relationship with temperature changes. In general, the temperature is measured on a stationary ferrule, usually the outer ring. The change in temperature over a certain period of time is the benchmark for assessment. The following are guidelines for a reliable method of measuring temperature: • Measure as close to the bearing as possible • Perform as continuous measurements as possible • Avoid bearing deformation caused by measuring force Normal bearing temperature change mode is steady-state. However, if you exceed the service life of the grease, the temperature change will be very unstable and will change. When bearing performance starts to degrade, corresponding measures must be taken.
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