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Bearing failure inspection

by:JNSN     2021-12-25
Due to its own quality and external conditions, the bearing capacity, rotation accuracy and wear resistance will change during the use of the bearing. When the performance index of the bearing is lower than the use requirement and cannot work normally, the bearing will malfunction or even Failure, once the bearing fails and other accidents, the machinery and equipment will stop, and various abnormal phenomena such as loss of function will occur. Therefore, it is necessary to find out the cause of the occurrence in a short period of time and take corresponding measures. In order to keep the bearing in good condition It can maintain its due performance and use it for a long time under the conditions of the following conditions. The bearing must be inspected and maintained. Inspection and maintenance are very important to prevent failure. During operation, the rolling sound, vibration, temperature and lubricant of the bearing must be checked. 1. Rolling acoustic noise of the bearing One is the bearing itself, that is, the inherent noise of the bearing; the other is the noise generated after the bearing is installed, and has nothing to do with the noise of the bearing itself. Some problems can be analyzed by listening to the sound. a) Inherent noise: raceway sound 'Various bearings and rolling friction sound (cylindrical roller bearing) is the inherent sound of rolling bearings.' The raceway sound is produced by the elastic characteristics of the rolling element and the raceway, when the bearing rotates When the rolling element is rolling on the raceway, it makes a continuous and smooth sound; abnormal rolling friction sound can make uncomfortable metal friction abnormal sounds such as squeaking and squeaking. Such a sound will not be made when the lubrication is good. Therefore, it is not a problem under normal circumstances. You need to pay attention only after the noise increases. b) Noise related to bearing manufacturing: This includes cage noise and tremor. Cage noise mainly occurs in ball bearings and tapered roller bearings. When the bearing rotates, it will make a sound due to the vibration of the cage and the collision between the cage and the rolling elements. This sound is periodic. The vibrato (various bearings) is a sound with a certain frequency, which is due to the larger on the raceway surface. It is caused by vibration caused by waviness. c) Noise caused by improper use: it exists for all kinds of bearings. When the surface of the bearing raceway or rolling element is bruised, cratered, or corroded, there will be a certain period of time. Noise and vibration. Dirt noise will be generated when dust invades the bearing during operation. This kind of noise is non-periodic and is also accompanied by vibration. The sound level is not fixed, sometimes not. 2. Bearing vibration bearing The impact of the vibration on the bearing failure is obvious. For example: peeling, indentation, rust, cracks, wear, etc. will be reflected in the bearing vibration test, so through the use of special bearing vibration measurement devices (frequency analyzer and vibrator, etc.) The magnitude of the vibration can be measured, and the specific situation of abnormal vibration can be inferred through the frequency distribution. The measured value depends on the use condition of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured value of each machine in advance. Determine the criterion. 3. The temperature of the bearing usually slowly rises as the operation starts, and it reaches a stable state after 1 to 2 hours. The normal temperature of the bearing is different due to the heat capacity, heat dissipation, speed and load of the machine. If If the lubrication and installation are improper, the bearing temperature will rise sharply and abnormalities will occur High temperature, you must stop the machine and take necessary precautions at this time. 4. Lubricant lubrication has an important impact on the fatigue life and friction, wear, temperature rise, and vibration of rolling bearings. Without normal lubrication, the bearing cannot work. Analysis of the bearing The cause of damage shows that about 40% of needle roller bearing damage is related to poor lubrication. Therefore, good lubrication of the bearing is an effective measure to reduce bearing friction and wear. In addition, the lubrication of the bearing is also effective for heat dissipation, rust prevention, and sealing. , Alleviate impact, etc. To ensure that the lubricant does not expire and fail, the selection must be correct. The lubrication of the harvester bearing is divided into oil lubrication and grease lubrication. The large-scale gear box oil lubrication chooses GL-5 80W90 gear oil; Grease lubrication generally uses molybdenum disulfide lithium-based grease, and the lower device of the infinitely variable transmission of the lubricating torque booster must be lubricated with Mobil XHP222 or better.
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