From the fact that peeling, indentation, corrosion, crack, wear, etc. will be reflected in the vibration measurement of the bearing, the vibration of ina bearing is very sensitive to the damage of the bearing.Criteria and treatment methods for judging fault damage of ina supercharger bearing
Criteria and treatment methods for judging fault damage of ina supercharger bearing
Therefore, the vibration of supercharger bearing can be measured by using a special bearing vibration meter (frequency analyzer, etc.), and the specific abnormal situation can not be inferred by frequency division. Because the measured values are different due to the service conditions of the bearing or the installation position of the sensor, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.Criteria and treatment methods for judging fault damage of ina supercharger bearing
Even if ina bearing has slight peeling and other damage, it will also produce abnormal sound and irregular sound. Therefore, it can be distinguished with a sound detector. The sound detector is used to check the size and sound quality of the rolling sound of the supercharger bearing in operation, so as to prevent it in advance.Criteria and treatment methods for judging fault damage of ina supercharger bearing
Metal peeling on raceway surface
The bearing rolling element and the inner and outer ring raceways are subjected to periodic fluctuating loads, resulting in periodic changes
Contact stress. When the number of stress cycles reaches a certain value, fatigue spalling will occur on the working surface of rolling element or inner and outer race raceway. If the load of ina bearing is too large, this fatigue will be exacerbated.Criteria and treatment methods for judging fault damage of ina supercharger bearing
In addition, the improper installation of supercharger bearing and the bending of shaft will also produce the phenomenon of raceway peeling. The fatigue spalling of bearing raceway will reduce the operation accuracy of shaft and cause vibration and noise of mechanism.Criteria and treatment methods for judging fault damage of ina supercharger bearing
The burned ina bearing has a return fire color on its raceway and rolling element. The causes of burns are generally insufficient lubrication, unqualified or deteriorated lubricating oil quality, and tight assembly of supercharger bearings.Criteria and treatment methods for judging fault damage of ina supercharger bearing
Uneven pits appear on the contact surface between the raceway and the roller of the bearing, indicating that the bearing has plastic deformation. The reason is that the local stress on the working surface of the bearing exceeds the yield limit of the material under great static load or impact load
This situation usually occurs on bearings rotating at low speed.Criteria and treatment methods for judging fault damage of ina supercharger bearing
Cracks on bearing race
The reasons for the cracks of the bearing race may be the tight fit of the bearing, the looseness of the ina bearing outer ring or inner ring, the deformation of the inclusion of the supercharger bearing, the poor surface processing of the installed bearing, etc.Criteria and treatment methods for judging fault damage of ina supercharger bearing
The reasons are insufficient lubrication, broken rolling element, seat ring skew, etc.
The metal of the cage adheres to the rolling element
The possible cause is that the rolling element is stuck in the cage or the lubrication is insufficient.Criteria and treatment methods for judging fault damage of ina supercharger bearing
The race race is severely worn
It may be that foreign matters fall into the seat ring, insufficient lubricating oil or inappropriate lubricating oil brand.Criteria and treatment methods for judging fault damage of ina supercharger bearing
If the oil hole can be used to directly measure the temperature of the bearing outer ring, it is more appropriate. In general, the temperature of supercharger bearing can be inferred according to the temperature outside the bearing chamber. If the lubrication and installation parts are appropriate, the bearing temperature will rise sharply and abnormal high temperature will occur. Criteria and treatment methods for judging fault damage of ina supercharger bearing
At this time, the operation must be stopped and necessary preventive measures must be taken. Usually, the temperature of the bearing rises slowly with the start of operation and reaches a stable state after 1-2 hours. The normal temperature of INA Bearing varies with the heat capacity, heat dissipation, speed and load of the machine. Criteria and treatment methods for judging fault damage of ina supercharger bearing
If necessary, the thermal sensor can be used to monitor the working temperature of the bearing at any time, and automatically alarm or stop when the temperature exceeds the specified value to prevent the occurrence of combustion shaft accident.
In the case of premature failure of all ina bearings, about 16% are caused by improper or incorrect installation. Various applications may require machinery, proper thermal or hydraulic devices and effective installation of oil-free bearings.
Choosing the appropriate installation method of the application will help you prolong the service life of the bearing and reduce the cost caused by premature failure and potential damage of the bearing.Criteria and treatment methods for judging fault damage of ina supercharger bearing
The bearings are usually heated in an oil bath before installation. However, this method may be caused by contaminated bearings and premature failure of oil-free bearings. Induction heating is a common heating method. Because of its controllability, the efficiency and of bearing are very high.Criteria and treatment methods for judging fault damage of ina supercharger bearing
Ina imported bearing induction heater application development standard. The bearing induction heater has many functions to help prevent damage to the bearings during heating.Criteria and treatment methods for judging fault damage of ina supercharger bearing
In fact, if each specific use, a sufficient number of bearing life tests have been taken to verify whether it is suitable for the economic time and labor of the selected bearing. Therefore, the bearing life test method is necessary or important. In most cases, in the case before use, a standard calculation method to estimate the life of ina bearing life has sufficient reliability level.
Maintenance and judgment of bearing: determine whether it can be used to check ina bearing after cleaning and remove the bearing. Check the raceway, raceway, surface condition, cage wear, oil-free bearing clearance and improvement of dimensional accuracy, irrelevant damage and abnormality. Criteria and treatment methods for judging fault damage of ina supercharger bearing
Non separable small ball bearing, inner ring, support level with one hand, rotate the outer ring to confirm smooth. Tapered roller bearings, such as separable bearings, can roll the body, and the outer race raceway surface has been inspected. For large bearings, because they cannot rotate by hand, pay attention to check the raceway, cage and wall of the rolling element, such as appearance. For the importance of higher bearings, they should be checked more carefully.Criteria and treatment methods for judging fault damage of ina supercharger bearing
When inspecting the rivet head, the main observation is whether there is a relationship between skew and loose welding position is incorrect. Welding quality. Whether the welding point is too small, whether there is welding or welding, the problem caused by solid ball card. Bearing testing requires special attention in the process. There are also some problems that need attention.
The secondary inspection of the environment of oil-free bearing should be in the light environment, which is astigmatism, so as to better observe the appearance of INA Bearing on the surface and there are no cracks and other abnormalities.
In the process of cloud like mechanical wear, scratches and touch pressure, the bearing equipment will lead to displacement, poor equipment position, flat bearing shape, load and stress concentration, and reduce accuracy and service life.
Impact sound of rolling element and its control method when the ball bearing or bearing of larger model runs at low speed under pure radial load, due to the small centrifugal force of the rolling element, the rolling element in the non load area will impact the cage or raceway and make noise. But as the speed increases, the sound will disappear.
Raceway sound of INA Bearing and its control method raceway sound is a smooth and continuous sound made by the rolling body rolling on the raceway surface when the shaft is running. It is a unique basic sound that will occur in all stainless steel bearings. The general bearing sound is the sound of raceway plus other sounds. The raceway sound of ball bearing is irregular, and its frequency is above 1000Hz. Its main frequency does not change with the speed, but its sound pressure level increases with the speed.
Small foreign matters may enter the bearing due to excessive grinding. Sand particles, metal particles produced during grinding and machining, and metal particles or carbides brought by gears will wear or grind rollers and raceways. In the universal joint bearing, the wear degree of the roller end face and the inner ring retaining edge is more serious than that of the raceway.
This kind of wear can cause the expansion of axial clearance or internal clearance, and then reduce the fatigue life of the bearing, resulting in the eccentricity of the bearing. In addition, wear can affect other parts of the machine where the bearing is located.
When taking the bearing directly by hand, fully wash the sweat from your hands and apply high-quality mineral oil before operation. Pay special attention to rust prevention in rainy season and summer.
Under some special operating conditions, the bearing can obtain a longer life than the traditional calculation, especially under light load. These special operating conditions are the surface damage that may be caused when the rolling surface (track and rolling parts) is effectively separated and limited by a lubricating oil film. In fact, under ideal conditions, the so-called permanent bearing life is not impossible