When the performance index of the cylindrical roller bearing is lower than the use requirement and cannot work normally, the cylindrical roller bearing will be faulty or even lost. After the cylindrical roller bearing has lost the accident, the machine and equipment will stop and appear. Various abnormal phenomena such as loss of function, so it is necessary to find out the cause in a short period of time and take corresponding measures. In order to maintain the performance of cylindrical roller bearings under good conditions and long-term use, cylindrical roller bearings must be inspected and maintained. Inspection and maintenance are very important to prevent malfunctions. Roller bearings for rolling sound, vibration, temperature and lubricant.
1. Rolling sound of cylindrical roller bearings
Cylindrical roller bearing noise is produced by the cylindrical roller bearing itself, that is, the inherent noise of the cylindrical roller bearing; the other is the noise generated after the cylindrical roller bearing is installed, regardless of the noise of the cylindrical roller bearing itself. You can analyze some problems by listening to the sound.
a) Noise associated with the manufacture of cylindrical roller bearings: including cage noise and vibrato, cage noise mainly occurs in ball cylindrical roller bearings and tapered roller cylindrical roller bearings, which are maintained when the cylindrical roller bearing rotates. The vibration of the frame and the impact of the cage with the rolling elements produce a sound. This sound is periodic. Vibrato (various cylindrical roller bearings) is a sound with a fixed frequency, which is caused by vibration caused by large waviness on the raceway surface.
b) Inherent noise: raceway sound: The raceway sound is generated by the elasticity of the rolling element in contact with the raceway. When the cylindrical roller bearing rotates, the rolling body rolls on the raceway to produce a continuous and smooth sound. Unusual rolling friction sounds can cause uncomfortable metal friction abnormal sounds such as "squeaky, squeaky", and does not sound like this when lubricated. So in the general case, it is not a problem, only attention should be paid after the noise increases.
c) Noise caused by improper use: It exists for all kinds of cylindrical roller bearings. When the surface of the raceway of the cylindrical roller bearing or the surface of the rolling element is bumped, crushed, rusted, it will produce a fixed period of noise and vibration. . When a cylindrical roller bearing invades dust during operation, it will generate dirt noise. This kind of noise is non-periodic, and it is also accompanied by vibration. The sound size is not fixed, sometimes it is not.
2. Vibration of cylindrical roller bearings
The vibration of the cylindrical roller bearing has obvious influence on the cylindrical roller bearing. For example, peeling, indentation, rust, crack, wear, etc. will be reflected in the vibration detection of the cylindrical roller bearing, so the special cylindrical roller is adopted. The bearing vibration measuring device (frequency analyzer, vibrometer, etc.) can measure the magnitude of the vibration, and the specific situation of the abnormal vibration can be inferred by the frequency distribution. The measured value is due to the use condition of the cylindrical roller bearing or the mounting position of the sensor. Different, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
3. Cylindrical roller bearing temperature
Usually, the temperature of a cylindrical roller bearing rises slowly as the operation starts, and reaches a steady state after 1 to 2 hours. The normal temperature of cylindrical roller bearings varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation are not suitable, the temperature of the cylindrical roller bearing will rise sharply, and abnormal high temperature will occur. At this time, it is necessary to stop and take necessary Precautionary measures.
4. Lubricant
Lubrication has an important influence on the friction and wear, temperature rise, vibration, etc. of rolling cylindrical roller bearings. Without normal lubrication, cylindrical roller bearings cannot work. Analysis of the damage of the cylindrical roller bearing indicates that about 40% of the cylindrical roller bearing damage is related to poor lubrication. Therefore, the good lubrication of cylindrical roller bearings is a measure to reduce the friction and wear of cylindrical roller bearings. In addition, the lubrication of cylindrical roller bearings also plays a role in heat dissipation, rust prevention, sealing, and mitigation. To ensure that the lubricant does not expire, the selection should be correct.
