Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
2022年4月10日
Adequate lubrication of SKF combined bearing, correct use and common faults
Adequate lubrication of SKF combined bearing, correct use and common faults
2022年4月11日

Adequate lubrication of SKF combined bearing, correct use and common faults

  • The lubrication methods of SKF bearings are divided into grease lubrication and oil lubrication. In order to make the combined bearing function well, first of all, the lubrication method suitable for use conditions and purposes should be selected. If only lubrication is considered, the lubricity of oil lubrication is dominant. 
  • However, grease lubrication has the advantage of simplifying the structure around the bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication. There are generally two kinds of fault phenomena of rolling bearing: one is that the temperature of the bearing installation part is too high, and the other is that there is noise in the bearing operation.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The rolling 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.Adequate lubrication of SKF combined bearing, correct use and common faults.Adequate lubrication of SKF combined bearing, correct use and common faults
Adequate lubrication of SKF combined bearing, correct use and common faults
 

Adequate lubrication of SKF combined bearing, correct use and common faults

  • The causes of rolling bearing noise are complex. One is the wear of the mating surfaces of the inner and outer rings of the bearing. Due to this wear, the matching relationship between the bearing and the shell and between the bearing and the shaft is damaged, resulting in the axis deviation from the correct position and abnormal noise when the shaft moves at high speed. Adequate lubrication of SKF combined bearing, correct use and common faults
  • When SKF Bearing is tired, its surface metal will peel off, which will also increase the radial clearance of the bearing and produce abnormal noise. In addition, the insufficient lubrication of the combined bearing, the formation of dry friction and the breakage of the bearing will produce abnormal sound. 
  • After the bearing is worn and loose, the cage is loose and damaged, which will also produce abnormal noise.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The bearing rolling element and the inner and outer race raceways bear the action of periodic fluctuating load, resulting in periodic 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 the bearing is too large, it will aggravate this fatigue. In addition, improper bearing installation and shaft bending will also produce raceway spalling.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The fatigue spalling of bearing raceway will reduce the operation accuracy of shaft and cause vibration and noise of mechanism.Adequate lubrication of SKF combined bearing, correct use and common faults
  • There is a return fire color on the raceway and rolling element of the burned bearing. The causes of burns are generally insufficient lubrication, unqualified or deteriorated lubricating oil quality, and too tight bearing assembly.Adequate lubrication of SKF combined bearing, correct use and common faults
  • Uneven pits appear on the contact surface between the raceway and the roller of the bearing, indicating that the SKF Bearing has plastic deformation. The reason is that under the action of large static load or impact load, the local stress on the working surface of the bearing exceeds the yield limit of the material, which generally occurs on the combined bearing rotating at low speed.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The reasons for the cracks of the bearing race may be the tight fit of the bearing, the looseness of the foreign or inner ring of the bearing, the deformation of the containing parts of the bearing, the poor surface processing of the installed bearing, etc.Adequate lubrication of SKF combined bearing, correct use and common faults
  • 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.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The reasons for the high temperature of SKF Bearing are: 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 assembly of combined bearing is too tight; The bearing race rotates on the shaft or in the shell; Excessive load; Broken bearing cage or rolling element, etc
  • The service life of SKF Bearing is closely related to manufacturing, assembly and use. It must be done well in every link. Only by paying attention to the above precautions when using non-standard bearings, can the bearing be in the running state, so as to prolong the service life of the bearing.Adequate lubrication of SKF combined bearing, correct use and common faults
  • In order to ensure that the bearing always operates in good condition, regular maintenance and repair is necessary, so as to prevent accidents and prevent accidents, improve the production efficiency of the enterprise and save costs. 
  • To be engaged in the professional maintenance of SKF bearings here, there must be a standard and systematic operation process, including the detection of operation status, lubricant, regular disassembly, noise, temperature and so on.
  • After the bearing is pressed into the bearing, it shall rotate flexibly without blocking feeling. If there is obvious inflexible rotation, it indicates that the size of the shaft is too large and the tolerance should be reduced.
  •  If there is an obvious “rusty” feeling when the bearing is rotated by hand after being put into the bearing, it may be that the tolerance of the bearing is too large or the roundness of the bearing is not good. Therefore, when controlling the tolerance of shaft and bearing, we should also control the roundness.
  •  whether the bearing is installed correctly is directly related to the accuracy, service life and performance of the bearing. Therefore, the installation and design department shall fully study the installation of the bearing and analyze the structure of the bearing in order to ensure the normal operation of the bearing:Adequate lubrication of SKF combined bearing, correct use and common faults
  • Clean bearings and bearing related parts; This is very important. Be sure to clean it to prevent sundries. Check the size and finish machining of related parts; This requires some special tools to ensure the accuracy of bearing installation. Inspection after installing the bearing; Check whether SKF bearings are matched and whether there are errors. The supply of lubricant requires careful operation, which is very important.
  • Second, basic monitoring conditions of bearing:Adequate lubrication of SKF combined bearing, correct use and common faults
  • Some professionals are required to inspect the bearings regularly, so as to find potential problems early, prevent unexpected machine suspension, enable production and improve the productivity and efficiency of the factory. During the use of bearings, the basic external conditions of bearing operation should be monitored frequently, such as temperature, vibration and noise measurement, so as to prevent accidents.Adequate lubrication of SKF combined bearing, correct use and common faults
  • Third, bearing alignment and alignment
  • These operations may accelerate fatigue and reduce the service life of bearings and damage the service life of other machine parts. In addition, increased vibration and friction may greatly increase energy consumption and the risk of premature failure. 
  • However, if the alignment is not carefully carried out after the bearing is installed, the alignment may cause the SKF Bearing to suffer additional load, friction and vibration. As a result, the bearing is damaged prematurely, so it should be aligned and straightened!Adequate lubrication of SKF combined bearing, correct use and common faults
Adequate lubrication of SKF combined bearing, correct use and common faults

Fourth, re lubrication of bearing:

  • If the bearing considers lubrication, the lubricity of oil lubrication is dominant. However, grease lubrication can simplify the specialty of the structure around the bearing. In the process of operation, the bearing requires correct re lubrication, which can make the bearing operate healthily.
  •  In order to make the bearing function well, first of all, choose the lubrication method suitable for the use conditions and purpose. Whether it is oil lubrication or grease lubrication depends on the specific situation of the bearing!Adequate lubrication of SKF combined bearing, correct use and common faults
  • Fifth, bearing removal:
  • Use proper tools for removal, which will help prevent damage to other machine components. Incorrect removal technology may cause damage to the bearing. If SK bearing reaches its final service life, it should be replaced. Although the bearing can no longer be used, correctly removing the original bearing and replacing the new bearing in time can play a good role in promoting the extension of the service life of the new bearing. Therefore, the replacement of the old and the new is very important, which requires professional personnel to check and operate
  • When the bearing is installed on the rotor for dynamic balance, it is easy to put the iron filings generated during dynamic balance into the non-standard bearing, so the dynamic balance is carried out before installing SKF Bearing. Adequate lubrication of SKF combined bearing, correct use and common faults
  • In order to facilitate assembly, some manufacturers apply some oil or grease in the bearing chamber for lubrication effect during assembly, but it is often difficult for operators to control the amount. If more oil or grease is accumulated in the bearing chamber, it is easy to enter the bearing along the shaft when the bearing rotates. 
  • The bearing shall not be coated with oil or grease. If it must be coated, it shall be controlled and there shall be no accumulation in the bearing chamber.Adequate lubrication of SKF combined bearing, correct use and common faults
  • Use the bearing in a standardized way until the end of the bearing life. Such cases are relatively rare. Generally, SKF bearings are damaged due to various reasons in the process of operation and production, and the bearings are directly scrapped in serious cases.Adequate lubrication of SKF combined bearing, correct use and common faults
  •  These reasons are nothing more than installation, use and lubrication. The common ones are caused by the jamming of the ring stop edge of non-standard bearings. The main reason is insufficient lubrication or foreign matters.Adequate lubrication of SKF combined bearing, correct use and common faults
  •  In view of these problems, we should first eliminate the causes of the accident, and investigate the recurrence of similar accidents on one side in combination with the use environment, location, structure and other aspects, which will bring unnecessary trouble.Adequate lubrication of SKF combined bearing, correct use and common faults
Adequate lubrication of SKF combined bearing, correct use and common faults
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