Bearing vibration is very sensitive to bearing damage, such as spalling, indentation, rust, cracks, wear, etc., which will be reflected in deep groove ball bearing vibration measurements. Therefore, by using a special bearing vibration measurer (frequency analyzer, etc.) The size of the vibration is measured, and the specific abnormality can be inferred through frequency analysis. The measured values vary depending on the operating conditions of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment criteria.
The temperature of the bearing can generally be estimated from the temperature outside the bearing chamber. It would be more appropriate if the oil hole can be used to directly measure the temperature of the bearing outer ring.
Usually, the temperature of the bearing begins to rise slowly as the bearing operates, and reaches a stable state after 1-2 hours. The normal temperature of deep groove ball bearings varies depending on the machine's heat capacity, heat dissipation, rotation speed and load. If the lubrication and mounting parts are appropriate, the bearing temperature will rise sharply and abnormally high temperatures will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.
Thermal sensors can be used to monitor the operating temperature of the bearing at any time, and automatically alarm or stop when the temperature exceeds the specified value to prevent shaft burning accidents.
High temperature often indicates an abnormal situation. High temperatures are also harmful to bearing lubricants. Sometimes bearing overheating can be attributed to the bearing's lubricant. If the bearing rotates continuously for a long time at a temperature exceeding 125°C, the service life of the bearing will be reduced. Causes of high temperature bearings include: insufficient lubrication or excessive lubrication, lubricants. Contains impurities, excessive load, damaged bearing rings, insufficient clearance, high friction caused by oil seals, etc.
Therefore, continuous monitoring of bearing temperature is necessary, whether measuring the bearing itself or other important parts. If operating conditions remain unchanged, any temperature change may indicate a malfunction.
In actual production, the service life of fixed deep groove ball bearings used in mechanical equipment is directly related to the normal use of mechanical equipment and the normal production of the equipment. Although bearings are selected according to different usage environments and conditions, many bearings fail due to damage long before their design life is reached. Failure of bearings will produce severe vibration and noise when used in production, and will also cause damage to related parts, ultimately causing a series of adverse effects.
1. Causes of premature bearing failure
There are many reasons for the premature failure of deep groove ball bearings, but the main ones are improper use and maintenance, improper lubrication, poor lubrication, contamination and overloading, and collisions and impacts during assembly, transportation, and disassembly. Contamination is caused by man-made factors such as failure to clean the disassembly tools.
The influence of the matching gap. The gap between the shafts is too large, and relative motion occurs between the two. First, the excessive wear gap of the matching shaft segments is getting larger and larger, and finally the bearing is scrapped. Second, the bearing produces cracks, which affects the bearing. Movement precision. These reasons cause premature bearing failure, which is detrimental to our actual work. Therefore, it is of great practical value to study how to avoid premature bearing failure and extend the service life.
2. How to avoid premature bearing failure
The most effective way to prevent premature failure of deep groove ball bearings is to try to avoid the various factors analyzed above and the conditions that contribute to these factors: First of all, when selecting bearings before use, the noise, rigidity, and bearing diameter should be taken into consideration. The size of the axial crack, the size of the rotational torque, etc. The selection of lubricating oil depends on the working environment of the bearing. Different lubricating media produce different noises during use.