Analysis of raceway noise of fag imported bearing
Analysis of raceway noise of fag imported bearing
2022年4月19日
Cause analysis of IKO imported bearing failure
Cause analysis of IKO imported bearing failure
2022年4月20日

Maintenance method for solving the heating of IKO imported bearing

1、 Effect of vibration on SKF Bearing.

  • In normal use, vibration is very sensitive to bearing damage. Peeling, indentation, corrosion, crack, wear and so on will be reflected in bearing vibration measurement. Therefore, the magnitude of vibration can be measured by using a special bearing vibration meter (frequency analyzer, etc.), and the specific situation of abnormality can not be inferred through frequency division.
  •  The measured values are different due to the service conditions of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.Maintenance method for solving the heating of IKO imported bearing

2、 Effect of temperature on bearing.

  • High temperature often indicates that SKF Bearing has been in abnormal condition. High temperature is also harmful to the lubricant of the bearing. Sometimes bearing overheating can be attributed to the lubricant of the bearing. If the temperature of the bearing exceeds 125 ℃ for a long time, the service life of the bearing will be reduced. The causes of high temperature bearings include insufficient or excessive lubrication and lubricant. It contains impurities, excessive load, bearing ring damage, insufficient clearance, high friction caused by oil seal, etc.Maintenance method for solving the heating of IKO imported bearing
  • In the process of using SKF Bearing, it is easy to have the phenomenon of temperature rise. When the bearing temperature rises, first judge whether there is misoperation. If it does rise, do the following:Maintenance method for solving the heating of IKO imported bearing
  • Check whether the cooling water pressure, water flow and pipeline system are normal. If the water pressure is low, the filter may be blocked and cannot be handled in time, it can be shut down for treatment. When it is confirmed that it can work, it can be put into use.Maintenance method for solving the heating of IKO imported bearing
  • Check the oil pressure of the governor. If the oil pressure is low, the cooling water hydraulic valve may be closed.
  • Check whether SKF Bearing has abnormal sound and whether bearing swing is abnormal.Maintenance method for solving the heating of IKO imported bearing
  • Take an oil sample to observe whether the oil color has changed, and test to see whether it has deteriorated. If the deterioration is confirmed, stop the machine and replace it with new oil.Maintenance method for solving the heating of IKO imported bearing
  • Check whether the oil level of the oil gauge is normal. If not, check whether the oil drain valve of the oil tank is tightly closed. If it has been closed tightly, oil shall be added. If it is oil leakage from the sealant pad, it shall be shut down for treatment.Maintenance method for solving the heating of IKO imported bearing
  • Vibration is very sensitive to the damage of SKF Bearing. Peeling, indentation, corrosion, crack and wear will be reflected in the bearing vibration measurement. Therefore, the magnitude of vibration can be measured by using a special bearing vibration meter (frequency analyzer, etc.), and the specific situation of abnormality can not be inferred through frequency division. The measured values are different due to the service conditions of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.Maintenance method for solving the heating of IKO imported bearing
  • Next, let’s take a look at the impact of temperature on the bearing. Using high temperature often indicates that SKF Bearing has been in an abnormal situation. High temperature is also harmful to the lubricant of the bearing. Sometimes bearing overheating can be attributed to the lubricant of the bearing. If the temperature exceeds 125 ℃ for a long time, the service life of the bearing can be reduced. The causes of high temperature bearings include insufficient or excessive lubrication and lubricant. It contains impurities, excessive load, bearing ring damage, insufficient clearance, high friction caused by oil seal, etc.Maintenance method for solving the heating of IKO imported bearing
  • Therefore, it is necessary to continuously monitor the temperature of SKF Bearing, whether it is measuring the bearing itself or other important parts. If the operating conditions remain unchanged, any temperature change can indicate that a fault has occurred.Maintenance method for solving the heating of IKO imported bearing
  • The periodic measurement of SKF Bearing temperature can be aided by thermometer, such as digital thermometer, which can accurately measure the bearing temperature and display it in ℃ or Fahrenheit. Important bearing means that when it is damaged, it will cause equipment shutdown. Therefore, this kind of bearing should be equipped with temperature detector.Maintenance method for solving the heating of IKO 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.Maintenance method for solving the heating of IKO 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.Maintenance method for solving the heating of IKO 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.
  • 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. Maintenance method for solving the heating of IKO 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.Maintenance method for solving the heating of IKO 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.Maintenance method for solving the heating of IKO 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. Maintenance method for solving the heating of IKO imported bearing
  • 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. 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. Maintenance method for solving the heating of IKO 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 reduction of radial clearance. Maintenance method for solving the heating of IKO imported bearing
  • The methods to control the sound of raceway are: 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.Maintenance method for solving the heating of IKO 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. As the speed increases, the sound disappears. 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.Maintenance method for solving the heating of IKO 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.Maintenance method for solving the heating of IKO imported bearing
  •  In addition, it is easy to occur in winter. 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. 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. Maintenance method for solving the heating of IKO 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.Maintenance method for solving the heating of IKO imported bearing
  • The cleaning of the disassembled imported bearing is divided into coarse cleaning and fine cleaning. Put the metal mesh pad on the bottom of the container respectively, so that the SKF Bearing does 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.Maintenance method for solving the heating of IKO 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.Maintenance method for solving the heating of IKO 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.Maintenance method for solving the heating of IKO 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.Maintenance method for solving the heating of IKO 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. 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.Maintenance method for solving the heating of IKO 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.Maintenance method for solving the heating of IKO imported bearing
  • 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.Maintenance method for solving the heating of IKO imported bearing

 

Maintenance method for solving the heating of IKO imported bearing

Maintenance method for solving the heating of IKO 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.
  • Maintaining IKO imported bearings is a necessary condition for bearing operation. The common maintenance is for bearing lubrication. After reading how to select the bearing lubrication mode and understanding the bearing lubrication mode, it is also necessary to understand the bearing system maintenance. Let’s see how to carry out IKO imported bearing lubrication and maintenance.
  • Keep the bearings lubricated clean
  • Before inspecting the bearing imported from IKO, Sweden, the surface of the bearing should be cleaned first, and then the oil seal of the bearing and its surrounding parts should be carefully inspected. If there are bad symptoms, it must be replaced. The bad oil seal will cause damage, make the cloud of the bearing abnormal and cause the shutdown of the equipment.
  • Take care to cover exposed bearings
  • When inspecting the bearing, do not expose the bearing to pollutants or moisture. If the work is interrupted, the machine shall be covered with oil paper, plastic sheet or similar materials. If it is possible to clean the naked bearing without disassembly, clean it with a brush coated with petroleum solvent, and then wipe it dry with a piece of lint free cloth or blow it dry with compressed air (be careful not to start the rotation of the bearing assembly). Use a small mirror and a probe similar to that used by dentists to check the track surface, retainer and beads of the bearing. The bearing cover can not be cleaned; Just wipe the outer surface. If the bearing is damaged, it needs to be replaced. It is much more economical to replace the bearing during the regular shutdown and maintenance period than the loss of sudden shutdown due to the damage of the array bearing.
  • Check the lubricant of the bearing
  • Lubricants are important not only for bearings, but also for all IKO imported bearings. However, please note that Japanese bearings should not add too much grease. Then it’s time to change the lubricant of the bearing. After draining the old engine oil, if possible, the bearings lubricated with engine oil should be filled with fresh engine oil and let the machine rotate at low speed for a few minutes.
  •  Make the oil collect residual pollutants as much as possible, and then drain the oil. When replacing the grease of the bearing lubricated with grease, the Joe remover used shall avoid the contact of cotton with any part of the bearing. Because these residual fibers may wedge between rolling parts and cause damage, especially in bearing applications.