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
Fault causes of SKF universal joint bearing caused by vibration
Fault causes of SKF universal joint bearing caused by vibration
2022年4月11日

Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings

  • 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.

Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings

  • 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. Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • 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.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • 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: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

First,clean the bearing and its 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 installation accuracy of the bearing. 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.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings

Second, basic monitoring conditions of bearing:

  • 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.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings

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!Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings

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. Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • 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!Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings

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. Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • 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. 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. Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • 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.
  • 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. Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • 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.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  •  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.
  • First of all, when using SKF bearings, some equipment have particularly strict requirements for their own clearance. If the clearance is too large, even a little large, it will easily wear the parts of the equipment. 
  • So we have to reduce the clearance to solve this problem, but another problem arises, that is, if the clearance is too small, the problem of heat dissipation, if the heat dissipation is improper, It will easily lead to the increase of internal temperature, and eventually cause the micro bearing to overheat and burn!
  • Original clearance
  • The original clearance of SKF Bearing refers to the clearance of the bearing in the free state before it is installed on the machine. In fact, it is difficult to know the original clearance without measurement. Therefore, the original clearance is often replaced by inspection clearance.
  • The inspection clearance is the clearance data measured by the instrument under the condition of applying the measured load in the inspection state. Strictly speaking, it is different from the original clearance of the bearing, but in general, the two have little difference in readings, so they can replace each other without much error.
  • Effective clearance
  • Effective clearance or working clearance refers to the actual clearance in SKF Bearing when the bearing is installed in the main engine and reaches a certain temperature rise under a certain load. Obviously, the effective clearance is smaller than the working clearance.
  • Functions and requirements of bearing clearance
  • The clearance in the bearing is to ensure the flexible and non blocking operation of the bearing, but it is also required to ensure the smooth operation of the bearing, no significant settlement of the axis of the micro bearing, and the number of rolling elements bearing the load as much as possible.
  • It may be excessive load (excessive preloading). Excessive speed. The clearance is too small. Intrusion of water or other foreign matters. If neither of the above two cases is true, the accuracy of the shaft and bearing housing is poor and the deflection of the shaft is large. 
  • The solution is: first of all, we should study lubricants and lubrication methods, select the right imported bearing lubricants and their dosage, and correct the selection of bearings. Study the fit, bearing clearance and preloading, and improve the sealing device. Check the accuracy of the shaft and bearing housing.
  • Use with care.
  • Strong impact on Timken bearing during use will produce scars and indentation, which will become the cause of the accident. In serious cases, it will crack and fracture, so we must pay attention to it.
  • Use appropriate operating tools.
  • Avoid replacing with existing tools, and appropriate tools must be used.
  • Pay attention to the corrosion of the bearing.
  • When operating Timken bearings, sweat on your hands can be the cause of rust. Pay attention to operate with clean hands and try to wear gloves.
  • Because Timken bearing is a high-precision product, if it is not assembled properly, it is easy to damage the bearing channel and lead to bearing damage. The bearing shall be equipped with a special mold during assembly, which cannot be knocked at will. When pressing the shaft, only the small ring can be stressed, and when pressing the large ring, only the large ring can be stressed. 
  • Pneumatic or hydraulic pressure is required during assembly. During press assembly, the upper and lower molds shall be outside the horizontal state. If there is inclination, the bearing channel will be damaged due to stress and the bearing will make a guide sound.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • When the bearing is installed on the rotor for dynamic balance, it is easy to enter the iron filings generated during dynamic balance into the bearing, so it is necessary to perform dynamic balance before installing Timken bearing.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  •  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.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  •  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.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • The feature of paint rust is that it often occurs in sealed motors. The sound of the motor is very good during assembly, but after it is put in the warehouse for some time, the abnormal noise of the motor becomes very large, and there is serious rust when the bearing is removed.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  •  In the past, many manufacturers thought it was the problem of Timken bearing. Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • After our continuous publicity, now the motor factory has realized that it is mainly the problem of insulating paint. This problem is mainly because the acidic substances volatilized from the insulating paint form corrosive substances at a certain temperature and humidity, which corrodes the bearing channel and leads to bearing damage. Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • At present, the problem can only be to select good insulating paint and assemble after drying and ventilation for a period of time.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • The service life of the bearing is closely related to manufacturing, assembly and use. It must be done well in each link in order to make the bearing in the running state, so as to prolong the service life of the bearing.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • Rolling bearings make precision parts, so it is required to be cautious when using them. Since high-performance bearings are used, if they are not used properly, they can not achieve the expected performance effect. Therefore, the following matters should be paid attention to when using Timken bearings:Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • Keep the bearings and their surroundings clean. Even if the invisible smile dust enters the bearing, it will increase the wear, vibration and noise of the bearing.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • When using and installing, it shall be careful. It is not allowed to punch with force, directly knock the bearing with a hammer, and transfer pressure through the rolling body.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • Use proper and accurate installation tools, try to use special tools, and try to avoid using cloth and short fiber.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • To prevent Timken bearing from rusting, 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 seasons and summer.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • How to measure the bearing clearance and how to ensure the accuracy of the clearance measurement are the problems often encountered by many users in measuring the bearing clearance. Here are some measurement methods, aspects to pay attention to and some measurement skills of Japanese NTN bearings.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • Bearing clearance refers to the movement amount of the bearing when one side of its inner ring or outer ring is fixed when it is not installed in the shaft or bearing housing, and then the unfixed side moves radially or axially. Generally speaking, the duration of bearing rotation is long, the stop is slow, and the flexibility is good.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  •  On the contrary, if the rotation time is short and the stop is sudden, the flexibility is not good. According to the moving direction, it can be divided into radial clearance and axial clearance. Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • The measurement of the radial clearance of the whole set of bearings is not easy. The measuring force causes the elastic deformation of the ferrule and the rolling element itself and its contact. Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • The amount of deformation is a multi factor causing the measurement error, which is related to the measuring force, the contact state and the position of the rolling element. The rotation flexibility of Japanese NTN bearings is generally checked at the horizontal position. Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • Usually fix the inner ring (or hold the inner ring by hand) and rotate the outer ring by hand to check whether there is abnormal sound and blockage during bearing rotation. Due to different structural types and sizes of bearings, there should be different requirements for their rotation flexibility. Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • For example, single row centripetal ball bearings and single row centripetal thrust ball bearings are relatively light when rotating due to the small contact area between the rolling element and the ferrule, while double row centripetal spherical bearings and thrust roller bearings are less light when checking their rotation flexibility due to the large contact area between the rolling element and the raceway and the small weight of the outer ring. 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.Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
  • For extra large bearings, there should be no jamming when rotating them, and the rotating sound is generally not checked.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
  •  For tapered hole bearing, the following methods can be used to supplement and check the rotation flexibility of the bearing. The specific operations are as follows: press the tapered hole bearing into the mandrel until a certain radial preload is added. 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
  • Under this preload, when a ferrule rotates, the rolling element should rotate. If the rolling element slides instead of rotates, it means that there are too many geometric defects of the ferrule or the size of the rolling element is uneven, and the rotation flexibility of the bearing is poor.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
  • In the case of close fit between the bearing ring and the bearing seat or transmission shaft, the bearing ring may be deformed by matching with the shape of adjacent components. 
  • If deformation occurs, vibration may occur during operation. Therefore, it is important to machine the bearing pedestal and drive shaft to the required tolerances.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