It is a comprehensive technology to judge and predict the reliability and service performance of IKO bearing through the fault and deterioration of combined bearing and performance state parameters, identify and judge the location, cause and risk degree of abnormal conditions, and determine the repair and improvement methods. Therefore, the fault diagnosis technology of bearing is not a simple fault detection (or monitoring) technology, nor is it a simple point inspection and instrumentation.
Correctly, quickly and effectively collect signals, process data, identify and judge manually or automatically. In order to determine the scientific repair cycle, necessary tests and estimates of fatigue and wear life should also be carried out according to the mechanism of various faults. The damage degree of bearing in use can be determined by listening, touching and observing.Judgment skills of damage degree of IKO combined bearing
Judgment skills of damage degree of IKO combined bearing
Observation: if the bearing is well lubricated and there are no sundries and moisture, it indicates that the oil seal of IKO bearing is not worn. If the original IKO bearing box is opened, visually inspect the bearing and regularly inspect the oil seal. Check the condition of the oil seal near the bearing to ensure that they are sufficient to prevent hot liquid, corrosive liquid and gas from penetrating into the bearing along the axis.
If the oil seal is damaged, replace it as soon as possible. Check the automatic lubrication system to ensure that the oil or grease enters the combined bearing, and ensure the correct addition amount. At the same time, check whether the lubricant is discolored or black. If so, it usually indicates that the lubricant contains impurities, which is also harmful to the use of the bearing.
Listening: using hearing to identify irregular operation is a very common method. For example, using a screwdriver or electronic stethoscope to detect a simple abnormal noise is a method often used by experienced operators and maintenance personnel. If the bearing is in good operation condition, it will make low whine sound.Judgment skills of damage degree of IKO combined bearing
For example, when the combined bearing makes sharp hiss, squeak and other irregular sounds, it may indicate that the IKO bearing is in bad operation condition.
Touch: high temperature often indicates that IKO bearing has been in abnormal condition, and high temperature is also harmful to the lubricant in the bearing. Judgment skills of damage degree of IKO combined bearing
However, the high temperature of the bearing is caused by the lubricant in the combined bearing at some times. If the bearing operates for a long time at a temperature exceeding 120 ℃, the service life of the bearing will be reduced.Judgment skills of damage degree of IKO combined bearing
The causes of bearing high temperature include insufficient or excessive lubrication of lubricant, impurities in lubricant, excessive load, bearing damage, insufficient clearance and friction caused by oil seal. Under normal circumstances, the bearing will have a natural temperature rise just after lubrication or after lubrication, and it will last for one to two days.Judgment skills of damage degree of IKO combined bearing
Grease lubrication includes the sealing method of filling grease in the sealed bearing in advance, and the filling grease supply method of filling an appropriate amount of grease in the shell and replenishing or replacing it at regular intervals. In addition, the centralized grease supply mode with pipes connected to each lubrication place is also adopted for the machinery with multiple IKO bearings that need lubrication.
Grease lubrication can be filled with grease for a long time without supplement, and the structure of its sealing device is relatively simple, so it is widely used. Oil lubrication is relatively simple. Regular lubrication can improve the service life of bearings.Judgment skills of damage degree of IKO combined bearing
The imported bearing is allowed to make slight running noise during operation. If the noise is too loud or there is abnormal noise or impact sound, it indicates that the bearing is faulty.Judgment skills of damage degree of IKO combined bearing
The reasons for the noise of spherical plain bearings are complex. One is the wear of the mating surfaces of the inner and outer rings of the bearings. Due to this wear, the matching relationship between bearing and shell, IKO bearing and shaft is damaged, resulting in the axis deviation from the correct position and abnormal noise when the shaft moves at high speed. Judgment skills of damage degree of IKO combined bearing
When the bearing is tired, the metal on its surface will peel off, which will also increase the radial clearance of the bearing and produce abnormal noise. In addition, insufficient bearing lubrication, dry friction and bearing breakage will produce abnormal sound. After the bearing is worn and loose, the cage is loose and damaged, which will also produce abnormal noise.Judgment skills of damage degree of IKO combined beari
When the mechanism is running, the part where the bearing is installed is allowed to have a certain temperature. When touching the mechanism shell by hand, it should be normal to feel that it is not hot. Otherwise, it indicates that the bearing temperature is too high.
The reasons for high bearing temperature include: the quality of lubricating oil does not meet the requirements or deteriorates, and the viscosity of lubricating oil is too high; The mechanism assembly is too tight (insufficient clearance); The bearing assembly is too tight; The bearing race rotates on the shaft or in the shell; Excessive load; IKO bearing cage or rolling element is broken.Judgment skills of damage degree of IKO combined bearing
The metallurgical quality of bearing materials is the main factor affecting the early failure of spherical plain bearings. With the progress of Metallurgical Technology (such as bearing steel, vacuum degassing, etc.), the quality of raw materials has been improved. The proportion of raw material quality factor in bearing fault analysis has decreased significantly, but it is still one of the main factors of joint bearing failure. Whether the selection is appropriate or not is still a bearing fault analysis that must be considered.Judgment skills of damage degree of IKO combined bearing
Bearing manufacturing will go through multiple processes of forging, heat treatment, turning, grinding and assembly. The rationality, advanced nature and stability of the treatment will also affect the service life of the bearing. Affecting the heat treatment and grinding process of IKO bearing is often more directly related to the fault of bearing and related product quality. Judgment skills of damage degree of IKO combined bearing
In recent years, the deterioration of bearing surface layer shows that the grinding process is closely related to the bearing surface quality.Judgment skills of damage degree of IKO combined bearing
The main task of bearing service life analysis is to find out the main factors causing joint bearing failure based on a large number of background materials, data and failure mode analysis. Therefore, improvement measures are put forward to prolong the service life of the bearing, so as to avoid sudden bearing onset and early failure.Judgment skills of damage degree of IKO combined bearing
Power operation, starting from no-load and low speed, slowly increase to the rated operation under the specified conditions. During the test run, the inspection items are whether there is abnormal sound, bearing temperature change, lubricant leakage or discoloration, etc. If any abnormality is found, stop the operation immediately, check the machinery, and remove the IKO bearing for inspection if necessary.Judgment skills of damage degree of IKO combined bearing
The bearing temperature can generally be inferred from the external temperature of the bearing seat. However, it is more accurate to directly measure the temperature of the outer ring of the spherical plain bearing by using the oil hole. The bearing temperature rises gradually from the beginning of operation, and the temperature is usually stable after 1 ~ 2 hours.
If the bearing is not installed properly, the temperature will rise sharply, resulting in abnormal high temperature. The reasons are too much lubricant, too small bearing clearance, poor installation, excessive friction of sealing device, etc. In the case of high-speed rotation, the wrong selection of bearing structure and lubrication mode is also the reason.Judgment skills of damage degree of IKO combined bearing
Selection and control of shaft and bearing housing tolerance: the bearing shall rotate flexibly without blocking feeling after being pressed into the plain bearing. If there is obvious inflexible rotation, it indicates that the size of the shaft is too large and the tolerance should be reduced.
If the IKO bearing rotates by hand after being pressed into the shaft, there is an obvious “rusty” feeling, it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, when controlling the tolerance of shaft and bearing chamber, it is also necessary to control the roundness. At present, many domestic manufacturers only control the tolerance, not the roundness.