Failure analysis of NSK tapered roller bearing
Failure analysis of NSK tapered roller bearing
2022-04-16
Bearing maintenance and damage Countermeasures
Bearing maintenance and damage Countermeasures
2022-04-16

Effect of IKO bearing grease on stability

  • Incorrect disassembly of shale shaker SKF Bearing is easy to cause medium and coarse internal damage, which will directly lead to the scrapping of the bearing. Therefore, be extra careful when disassembling the imported bearing of shale shaker SKF, and the axis must be supported during disassembly, otherwise the consequences will be very serious.Effect of IKO bearing grease on stability
  • Disassembly of SKF Bearing periphery of vibrating screen
  • Remove the outer ring of the interference fit, set several screws for the outer ring extrusion screw on the circumference of the shell in advance, and tighten the screw equally on one side. Remove it at the same time. These screw holes are usually covered with blind plugs, separable bearings such as vibrating screen tapered roller bearings, etc., and several cuts are set on the housing shoulder. At this time, gaskets should be used, and then removed with a press or gently patted slowly.Effect of IKO bearing grease on stability
  • Second, disassembly of cylindrical hole bearing of vibrating screen
  • When removing the inner ring, you can actually use a press to remove and pull it out, which is so simple. At this time, pay attention to make the inner ring bear its pulling force. The inner ring of large vibrating screen bearing is disassembled by oil pressure method. Oil pressure is applied through the oil hole arranged on the shaft to make it easy to pull out. Effect of IKO bearing grease on stability
  • The SKF Bearing with large width is disassembled by the combination of oil pressure method and drawing fixture. Induction heating method can be used to disassemble the inner ring of the bearing of Nu and NJ cylindrical roller vibrating screen. It is a method of drawing after heating part in a short time to expand the inner ring.Effect of IKO bearing grease on stability
  • III. disassembly of tapered bore bearing
  • When disassembling the small SKF imported bearing with fixed sleeve, it is necessary to fasten the support inner ring on the bearing, then turn the nut back several times, and knock it down with cushion block or hammer.Effect of IKO bearing grease on stability
  • As we all know, the sales volume, quality and quality of SKF bearings are at the forefront of the world. It has its professional flow production line. After strict factory inspection of each process, SKF bearings are sold all over the world to provide support for the industrial development of the world. The quality of SKF imported bearings is an important basis for it to win market recognition, so from what aspects to judge the quality of SKF imported bearings?Effect of IKO bearing grease on stability
  • First, the industrial design of the bearing is reasonable and perfect, with the world level, and the strong quality ensures its service life. SKF Bearing forging must go through rigorous processes such as forging, bearing heat treatment, turning, grinding and bearing equipment. Effect of IKO bearing grease on stability
  • Various processing processes will affect the service life of the bearing. Among them, the quality of SKF imported bearings is directly related to bearing failure. With the continuous progress of scientific and technological inspection, SKF bearing surface inspection found that the grinding process of metamorphic layer is closely related to the quality of fish SKF bearing surface.Effect of IKO bearing grease on stability
  • Second, the metal lottery used in SKF Bearing manufacturing was once a major factor affecting bearing failure. Now, with the continuous progress of metallurgical technology, the extraction of raw materials has been well improved and the quality of materials has been greatly improved. Now the quality factor of raw materials has decreased significantly in bearing failure. At this stage, this problem still exists.
  • Third, whether the material selection of bearing manufacturing is qualified or not is also a factor that must be considered for bearing failure. In the detection of SKF Bearing Failure, it is mainly to find out and solve the main factors of bearing failure according to a large number of Beijing materials, data analysis, failure environment and forging process, so as to facilitate the continuous optimization, service life and efficiency improvement of SKF Bearing. Extend the service life of SKF Bearing to avoid sudden early failure of bearing. The installation condition is one of the primary factors in the use factors. Effect of IKO bearing grease on stability
  • The improper installation of SKF Bearing often leads to the change of the stress state between the parts of the whole bearing, and the SKF Bearing operates in an abnormal state and fails early. According to the technical requirements of SKF Bearing installation, use, maintenance and repair, monitor and inspect the load, speed, working temperature, vibration, noise and lubrication conditions of the running bearing, find out the cause immediately and adjust it to make it return to normal. Bearing is a fixed part of machinery and the main body of machinery. Its function is basically to maintain the central position of the shaft and control the movement. INA Bearing plays an important role in any machine. Without bearing, the machine can’t run.Effect of IKO bearing grease on stability
  • Many users have reported that the heating fault of ina bearing is common when using the bearing, and this fault will also affect the service life and performance of INA Bearing. So, how did this fault form? Here are some knowledge summarized for you.Effect of IKO bearing grease on stability
  • The oil level is too low and the lubricant is lost from the oil seal;Effect of IKO bearing grease on stability
  • The oil level ina in the bearing box is too high or completely filled with grease. This will lead to excessive mixing of lubrication, high temperature or oil leakage;Effect of IKO bearing grease on stability
  • The contact (friction) oil seal is too dry or the spring is too tight;Effect of IKO bearing grease on stability
  • INA Bearing housing hole is not round; The bearing housing is twisted and deformed; The bearing surface is not flat; The inner diameter of the box hole is too small;Effect of IKO bearing grease on stability
  • The contact (friction) oil seal is too dry or the spring is too tight.Effect of IKO bearing grease on stability
  • Selection and control of tolerance of shaft and ina bearing housing
  • INA Bearing shall rotate flexibly without blocking feeling after being pressed into the 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 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.Effect of IKO bearing grease on stability
  •  Therefore, when controlling the tolerance of shaft and ina bearing chamber, it is also necessary to control the roundness. At present, many domestic manufacturers only control the tolerance and do not control the roundness.Effect of IKO bearing grease on stability
  • Assembly method of INA Bearing
  • Because ina bearing is a high-precision product, if it is not assembled properly, it is easy to damage the bearing channel, resulting in bearing damage. INA Bearing shall be equipped with special mold during assembly, and can not be knocked at will. When pressing in the shaft, only the small ring can be stressed, and when pressing the large ring, only the large ring can be stressed.Effect of IKO bearing grease on stability
  •  Air pressure 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 INA Bearing channel will be damaged due to stress and the INA Bearing will produce conduction sound.Effect of IKO bearing grease on stability
  • Prevention of foreign matters during assembly
  • When ina 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 dynamic balance is performed before installing the 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. If more oil or grease is accumulated in the bearing chamber, it is easy to enter the INA Bearing along the shaft when the ina bearing rotates. The bearing chamber shall not be coated with oil or grease. If it must be coated, it shall be controlled and there shall be no accumulation in ina bearing chamber.Effect of IKO bearing grease on stability

 

Effect of IKO bearing grease on stability

Effect of IKO bearing grease on stability

  • 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 has been put in the warehouse for some time, the abnormal noise of the motor becomes very large, and there is serious rust when the ina bearing is removed. In the past, many manufacturers thought it was the bearing problem.Effect of IKO bearing grease on stability
  •  After our continuous publicity, now the motor factory has realized that the main problem is the insulating paint. This problem is mainly because the acid substances volatilized from the insulating paint form corrosive substances at a certain temperature and humidity, which corrodes the INA Bearing channel and leads to the damage of INA Bearing. At present, the problem can only be to select good insulating paint and assemble after drying and ventilation for a period of time. Effect of IKO bearing grease on stability
  • The main reason for the bearing is that IKO bearing has poor lubrication. Irregular lubricant may be used, or too much or too little lubricant is incorrect. The solution is, first of all, to study lubricants and lubrication methods, select the right bearing lubricants and their dosage, and correct the selection of bearings. Check the accuracy of the shaft and bearing housing! Effect of IKO bearing grease on stability
  • Unreasonable structure, poor data quality, low performance, defects in the appearance of the task, impact, vibration, improper device and poor smoothness can form a bearing. However, in some cases, some IKO bearings are basically not put into use (operation), but the user’s original complete appearance is damaged in the installation process, losing the applicability, resulting in the premature effectiveness of the bearing.Effect of IKO bearing grease on stability
  • In the process of using IKO bearing, especially when lubricating the bearing, pay attention to the amount of grease. How to use grease accurately, we must understand the movement of grease in IKO bearing 6316-2rs to ensure the stability of grease. The movement of the grease filled in the rolling bearing can be roughly divided into two stages with the change of IKO bearing.Effect of IKO bearing grease on stability
  • Different greases form different profiles in the bearing. The profile must be quite drafted, and the walking time is short. In the long-term operation, the bearing temperature is low and stable. This is a kind of fantasy grease. Therefore, the channelization of the grease is particularly important.Effect of IKO bearing grease on stability
  • Under popular conditions, the filling amount of grease in IKO bearing always exceeds the practical demand of direct intervention lubrication, fills the cavity on the support and the bearing cover, and forms a contour on the periphery of the rolling element. During this process, the bearing temperature rises rapidly due to the resistance of excess grease. Although most of the excess grease is squeezed out at the initial stage of operation, and the grease squeezed in the accessories of the raceway may still be migrated and transformed into the rolling element and brought into the raceway.Effect of IKO bearing grease on stability
  • In the initial stage of the bearing, most of the grease is quickly squeezed out of the raceway (less than a minute), and the accumulated grease is discharged in small quantities in succession as the bearing migrates and transforms. Effect of IKO bearing grease on stability
  • At this time, the bearing Wendu continues to rise until all the excess grease is discharged, which can be called the running in stage of grease. According to the quality and filling amount of grease in the bearing structure, this period may last for more than ten minutes or even several hours.Effect of IKO bearing grease on stability
  • After the remaining grease is completely discharged, the remaining small amount of grease forms a thin layer of grease film on the mutual contact surface of rolling element, raceway and standoff frame through wedge impregnation, and then enters the normal stage of bearing. At this time, the temperature gradually decreases and reaches equilibrium.Effect of IKO bearing grease on stability
  • Therefore, it is concluded from the above that the long-standing lubrication and impregnation should be borne by relying on this layer of lubricating grease film. In addition, during the long-term operation of the bearing, the lubricating grease on the contour near the rolling element and raceway and on the standoff frame will shrink and separate part of the base oil. After flowing into the raceway, it will also supplement and impregnate the lubrication to a certain extent.Effect of IKO bearing grease on stability
  • Because NTN bearing is a high-precision product, if it is not assembled properly, it is easy to damage the NTN bearing channel, resulting in 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 NTN bearing will produce conduction sound.
  • When the NTN 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 the bearing. In order to facilitate assembly, some manufacturers apply some oil or grease in the NTN bearing chamber for lubrication effect during assembly, but it is often difficult for operators to control the amount.
  •  If there is a large amount of oil or grease in the bearing chamber, it is easy to enter the bearing along the shaft when the bearing rotates. The bearing chamber 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 NTN bearing chamber.
  • The service life of NTN 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 and prolong the service life of the bearing.
  • The additional sealing device supported by the NTN bearing can effectively make the bearing work normally without being invaded by external dirt, but this additional sealing device will increase the axial dimension of the mechanical mechanism and bring inconvenience to the use and installation of the bearing. 
  • At the same time, the sealing function of the additional sealing device is often affected by the machining accuracy and geometric tolerance of the matching parts of the journal and shell. Therefore, in the parts with compact structure and strict sealing requirements, If the motor supports NTN bearings, deep groove ball bearings with seals have been used in large quantities.
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