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Bearing professor describes how to look at the problems of cylindrical roller bearings

Source: China Bearing Network Time: 2013-05-19

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In order to make the cylindrical roller bearing adhere to its proper function under long-term conditions and to use it for a long time. It is necessary to view and protect the cylindrical roller bearing; viewing and protection is very important to prevent the problem; in the operation, it is necessary to check the rolling sound, oscillation, temperature and smoothing agent of the cylindrical roller bearing.
When the performance index of the cylindrical roller bearing is lower than the application requirement and cannot work normally; the cylindrical roller bearing will suffer from problems or even failure; after the accidental condition such as the failure of the cylindrical roller bearing; the machine and equipment will stop; Various anomalies such as loss of function; therefore, the need to detect the cause of the attack in a short period of time; and adopt the corresponding method.
1. The tumbling cylindrical roller bearing noise of a cylindrical roller bearing is one of the cylindrical roller bearing itself; that is, the inherent noise of the cylindrical roller bearing; the other is the noise that occurs after the cylindrical roller bearing is installed; The noise of the sub-bearing itself is irrelevant. After listening to the sound, you can divide some questions. a) Noise associated with the manufacture of cylindrical roller bearings: This includes the interference of the rack noise and vibrato; the main cause of the stick noise is in the cylindrical cylindrical roller bearing and the tapered roller cylindrical roller bearing; when the cylindrical roller bearing rotates, it is adhered to The oscillation of the frame and the collision of the holder and the rollover will announce the sound. This sound has a periodicity. Vibrato (various cylindrical roller bearings) is an acoustic sound with a certain frequency; it is caused by oscillation caused by large waviness on the raceway surface. b) Inherent noise: raceway sound: the rolling sound is caused by the elastic characteristics of the rolling body and the raceway; when the cylindrical roller bearing rotates; the rolling body rolls over the raceway and announces a successive and slick Sound; abnormal tumbling conflicts can announce unusual sounds of uncomfortable metal conflicts such as "cracking, squeaking"; such sounds will not be announced when smooth. Therefore, it is not a problem under normal conditions; as long as the noise increases, attention should be paid. c) Noise caused by improper use: There are various cylindrical roller bearings. When the cylindrical roller bearing raceway surface or the tumbling external surface is bumped, crushed, rusted, there will be a certain period of noise and oscillation. When a cylindrical roller bearing invades dust during work, it will cause dirt noise. This kind of noise is counter-cyclical, the same is accompanied by oscillation, and its sound is not fixed; sometimes it is not.
2. The oscillation of the oscillating cylindrical roller bearing of the cylindrical roller bearing has a significant effect on the failure of the cylindrical roller bearing. For example, shedding, indentation, rust, cracks, and abrasions are all reflected in the oscillation detection of cylindrical roller bearings. Therefore, the oscillation can be measured by using special cylindrical roller bearing oscillation measuring equipment (frequency analyzer and oscillator, etc.). The size of the frequency can be inferred from the frequency of the abnormal oscillation, the measured value is different due to the operating conditions of the cylindrical roller bearing or the orientation of the sensor device. Therefore, the measurement value of each machine is analyzed beforehand. Determine the specification.
3. The temperature of a cylindrical roller bearing generally increases the temperature of the cylindrical roller bearing with the start of the operation, and reaches a stable state after 1 to 2 hours. The normal temperature of a cylindrical roller bearing is different depending on the heat capacity, heat dissipation, speed and load of the machine. If it is smooth and the device is not suitable, the temperature of the cylindrical roller bearing will rise sharply and it will show an abnormally high temperature. At this time, it is necessary to stop and adopt the necessary precautions.
4. The smoothness of the smoothing agent has an important influence on the conflict and wear, temperature rise, oscillation, etc. of the tumbling cylindrical roller bearing, and there is no normal smoothness, and the cylindrical roller bearing cannot operate. Analysis of the damage of cylindrical roller bearings indicates that damage to cylindrical roller bearings of about 40% is related to poor smoothness. Thus the outstanding smoothness of cylindrical roller bearings is a useful way to reduce the conflict and wear of cylindrical roller bearings. In addition, the smoothness of cylindrical roller bearings also plays a role in heat dissipation, rust prevention, sealing, and flat cushioning. To ensure that the smoothing agent does not expire, the selection should be correct. The cylindrical roller bearing of the harvester is smooth and oily and smooth.

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