Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
The failure of SKF Bearing of dismantling shale shaker
2022年4月19日
Influence of vibration and temperature on NSK bearing in use
Influence of vibration and temperature on NSK bearing in use
2022年4月19日

Reasons affecting grinding deterioration layer of SKF imported bearing

  • 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! 
  • 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.Reasons affecting grinding deterioration layer of SKF imported bearing
  • 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.Reasons affecting grinding deterioration layer of SKF imported bearing
  • 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.Reasons affecting grinding deterioration layer of SKF imported bearing
  • 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. Reasons affecting grinding deterioration layer of SKF imported bearing
  • 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.Reasons affecting grinding deterioration layer of SKF imported bearing
  • 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. 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.Reasons affecting grinding deterioration layer of SKF imported bearing
  • 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.Reasons affecting grinding deterioration layer of SKF imported bearing
  • 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. Reasons affecting grinding deterioration layer of SKF imported bearing
  • Most fag bearings are damaged for many reasons, such as exceeding the original estimated load, ineffective sealing, too small bearing clearance caused by too tight fit, etc. Any of these factors has its special damage type and will leave special damage traces. Therefore, by examining the damaged bearing, the possible causes can be found in most cases.Reasons affecting grinding deterioration layer of SKF imported bearing
  • Generally speaking, one-third of the bearing damage is caused by fatigue damage, the other one-third is caused by poor lubrication, and the other one-third is caused by pollutants entering the bearing or improper installation and treatment. However, these types of damage are also related to industry. For example, the pulp and paper industry is mostly due to bearing damage caused by poor lubrication or pollution, rather than material fatigue.Reasons affecting grinding deterioration layer of SKF imported bearing
  • When inspecting the fag bearing removed during the regular maintenance and operation of fag bearing equipment and the replacement of peripheral parts, it is necessary to judge whether the secondary bearing parts can be reused and record the good or bad use. Reasons affecting grinding deterioration layer of SKF imported bearing
  • Also carefully investigate and record the appearance of the removed fag bearings. In order to find out and investigate the remaining amount of lubricant, the fag bearing should be well cleaned after sampling.Reasons affecting grinding deterioration layer of SKF imported bearing
  • Secondly, check the raceway surface, rolling surface and mating surface of fag bearing and the wear state of cage for damage and abnormalities, especially observe the running track of raceway surface. Judge whether the bearing can be used again after considering the degree of bearing damage, machine performance, importance, operating conditions, inspection cycle, etc.Reasons affecting grinding deterioration layer of SKF imported bearing
  • According to the inspection results, if the fag bearing is found to be damaged or abnormal, please find out the causes and formulate countermeasures according to the phenomenon of bearing damage. In addition, according to the inspection results, if there are the following defects, the fag bearing can no longer be used and needs to be replaced with a new bearing. Reasons affecting grinding deterioration layer of SKF imported bearing
  • The clearance of rolling bearing is divided into radial clearance and axial clearance. Its function is to ensure the normal operation and lubrication of rolling element and compensate thermal elongation.Reasons affecting grinding deterioration layer of SKF imported bearing
  • For Timken bearings with adjustable clearance, due to the positive proportional relationship between axial clearance and radial clearance, the required radial clearance can be obtained as long as the axial clearance is adjusted. However, they are generally used in pairs (i.e. installed at both ends or one end of the shaft). Therefore, it is only necessary to adjust the axial clearance of one Timken bearing. The axial clearance is generally adjusted with gaskets, and some can also be adjusted with screws or thrust rings.Reasons affecting grinding deterioration layer of SKF imported bearing
  • For rolling bearings with non adjustable clearance, the radial clearance cannot be adjusted because it has been determined according to the standard during manufacturing. After such Timken bearings are installed on the shaft diameter or in the bearing seat hole, the actual radial clearance is called assembly radial clearance. During assembly, the size of the assembly radial clearance should be just enough to create the necessary working radial clearance during operation, so as to ensure the flexible rotation of the bearing. Reasons affecting grinding deterioration layer of SKF imported bearing
  • When this kind of Timken bearing is working, due to the thermal elongation of the shaft when the temperature rises, the inner race is relatively displaced, which reduces the radial clearance of Timken bearing and even makes the rolling element stuck between the inner and outer race. The above phenomenon can be avoided if an axial clearance is left between one bearing (the other Timken bearing is fixed on the shaft and in the Timken bearing seat) and the side cover in the double support rolling Timken. Reasons affecting grinding deterioration layer of SKF imported bearing
  • Incorrect lubricant selection, insufficient lubricant or aging hardening can lead to vibration and noise of INA Bearing, and this noise has no certain law. In this case, only select the appropriate lubricant, adjust the amount of lubricant, prolong the service life of lubricant and reasonably determine the replacement cycle.Reasons affecting grinding deterioration layer of SKF imported bearing
  • The 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 rolling bearings. The general INA Bearing sound is the sound of raceway plus other sounds. The raceway sound of ball bearing is irregular, and its frequency is above 1000Hz. Reasons affecting grinding deterioration layer of SKF imported bearing
  • Its main frequency does not change with the speed, but its total sound pressure level increases with the speed. For INA Bearing with loud raceway sound, the sound pressure level of raceway sound decreases with the increase of viscosity; For ina bearings with low raceway sound, the sound pressure level changes from decrease to increase when the viscosity increases to more than 20mm2 / s. Reasons affecting grinding deterioration layer of SKF imported bearing
  • The greater the rigidity of the bearing pedestal, the lower the total sound pressure level of the raceway sound. If the radial clearance is too small, the total sound pressure level and dominant frequency of raceway sound will increase sharply with the decrease of radial clearance. The methods to control the sound of raceway are: Reasons affecting grinding deterioration layer of SKF imported bearing
  • select low-noise bearing, that is, INA Bearing with small waviness, and carefully select the service conditions. Raceway noise often affects the noise of the whole machinery. Reducing raceway noise can reduce the noise of the whole machinery.Reasons affecting grinding deterioration layer of SKF imported bearing
  • Impact sound of rolling element and its control method when the ball bearing or cylindrical roller 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. The control methods of impact sound of rolling elements include: appropriately reducing radial clearance and using INA Bearing with cage with reasonable structure and flexible material.Reasons affecting grinding deterioration layer of SKF imported bearing
  • The rolling sound of INA Bearing and its control method rolling sound is the harsh metal friction sound that can occur in cylindrical roller bearings on all occasions. Most of it occurs in grease lubricated larger ina bearings, which is more likely to occur in greases with degraded base oil performance, and almost does not occur in oil lubrication. In addition, it is easy to occur in winter. Reasons affecting grinding deterioration layer of SKF imported bearing
Reasons affecting grinding deterioration layer of SKF imported bearing
  • When bearing pure radial load, it is easy to occur in the case of large radial clearance, and it is easy to occur in a specific speed range with different models and sizes, both continuously and intermittently. Special processing methods for the outer ring raceway can prevent the occurrence of rolling sound.Reasons affecting grinding deterioration layer of SKF imported bearing
  •  If necessary, this ina bearing can be selected, or the radial clearance of the bearing can be appropriately reduced, the lubricating grease with excellent performance can be used and the rigidity of the parts matched with the bearing can be improved. Reasons affecting grinding deterioration layer of SKF imported bearing
  • When disassembling the lower SKF Bearing for maintenance, first record the appearance of SKF Bearing, confirm the residual amount of lubricant, and wash the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used.Reasons affecting grinding deterioration layer of SKF imported bearing
  • The cleaning of the dismantled imported bearings is divided into rough cleaning and fine cleaning. The metal mesh pad bottom is placed in the container respectively, so that the SKF bearings do not directly contact the dirt of the container. During rough cleaning, if SKF Bearing rotates with dirt, it will damage the rolling surface of the bearing, which should be paid attention to. In the coarse cleaning oil, use a brush to remove the grease and adhesion. After it is roughly clean, turn to fine cleaning.Reasons affecting grinding deterioration layer of SKF imported bearing
  • Fine cleaning is to carefully clean the SKF Bearing while rotating in the cleaning oil. In addition, the cleaning oil should always be kept clean.Reasons affecting grinding deterioration layer of SKF imported bearing
  • In order to judge whether the disassembled SKF Bearing can be reused, it is necessary to check after the bearing is cleaned, and carefully check the state of raceway surface, rolling surface and mating surface, the wear of cage, the increase of SKF Bearing Clearance, and whether there are damages and abnormalities related to the decline of dimensional accuracy. For non separable small ball bearing, support the inner ring horizontally with one hand and rotate the outer ring to confirm whether it is smooth.Reasons affecting grinding deterioration layer of SKF imported bearing
  • Tapered roller bearing and split SKF Bearing can inspect the raceway surface of rolling element and outer ring respectively. Since large imported bearings cannot be rotated by hand, pay attention to the appearance of rolling elements, raceways, cages and edge retaining surfaces. The higher the importance of SKF bearings, the more careful the inspection is.Reasons affecting grinding deterioration layer of SKF imported bearing
  • Once the final value of the required rated load is determined, you must consider the overall dimensions required for the installation of SKF bearings, including the installation and fixing of SKF bearings considered here. And the size of the shaft matching the bearing with the required load rating.Reasons affecting grinding deterioration layer of SKF imported bearing
  • These factors help to determine the bearing structure and size, and some imported bearing types can be excluded. In some cases, due to space constraints, the choice is excluded even before the rated load is determined.Reasons affecting grinding deterioration layer of SKF imported bearing
  • For example, if the shape of SKF Bearing is very narrow, ball bearing is the type that can work here. Alternatively, if you have to use a bearing housing with a very small diameter, you need to install two or more roller bearings on the same shaft to achieve sufficient load rating.
  • Another common contradiction arises when the size of the shaft is very different from the required SKF Bearing Load Rating. If the shaft is large but the load is light, even if the required rated load is very small, an expensive and large SKF Bearing with high rated load must be proposed. In this case, contact the bearing manufacturer in order to put forward a cost-effective solution.

Reasons affecting grinding deterioration layer of SKF imported bearing

  • Basic working conditions. Assuming SKF Bearing is applied to reducer, the inlet bearing must support one end of a shaft with a diameter of about 25mm, and a spur gear is installed on the shaft.
  • Duty cycle and SKF inlet bearing load. The analysis of the gear force and the working cycle of the transmission show that the radial load borne by the bearing is 1780n and the speed is 11000r / min in about 3 / 4 of the time, and the radial load borne by the SKF Bearing is 890n and the speed is 3500r / min in 1 / 4 of the running time. Good positive engagement produces almost no axial force, and there is no oblique engagement or other effective axial component force. It is estimated that the large axial force in both directions is 89n and the large vibration force is 89n.Reasons affecting grinding deterioration layer of SKF imported bearing
  • Dimensional limits. Due to the limitation of the internal design of the reducer, the large outer diameter of SKF Bearing is allowed to be 70mm, the large calculated disturbance is 6, and the different axial degrees of large positions are 0 and 0015. Do not require self-aligning bearings.Reasons affecting grinding deterioration layer of SKF imported bearing
  • environment The lubrication of SKF bearings is the same as meshing lubrication: oil is injected from a large oil groove, and the high expected temperature is 140 F.Reasons affecting grinding deterioration layer of SKF imported bearing
  • Reliability. SKF Bearing must have a good reliability in order to work continuously, with a reliable failure rate of 8%.Reasons affecting grinding deterioration layer of SKF imported bearing