Inspection and Disposal of Faults in Bearing Operation
Inspection and Disposal of Faults in Bearing Operation
2022-04-15
Specified conditions for regular inspection of SKF imported bearings
Specified conditions for regular inspection of SKF imported bearings
2022-04-15

Lubrication mode of Koyo bearing and manufacturing principle of operation

  • Koyo imported bearing, in most cases, working state: use appropriate clearance. According to different uses, and in the assembly bearing, the bearing is advanced to make the internal stress and make the negative bearing clearance used.Lubrication mode of Koyo bearing and manufacturing principle of operation
  •  This method is called using preload. More suitable, such as angular contact ball bearings, tapered roller bearings, two family bearings, bearing clearance, can be adjusted.
  • Main purpose of preloading: the main purpose of preloading can be proved by some representative examples:Lubrication mode of Koyo bearing and manufacturing principle of operation
  • In the correct direction and radial position, the axial direction determines the shaft and suppresses the runout of the shaft.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Increase the rigidity of the bearing. Machine tool spindle bearing, bicycle and small agent bearing, gear differential.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • To prevent the axial direction of vibration and resonance of different sounds. Small motor bearings.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Suppress scrolling, rotating, sliding, and rotating revolutionary slides. High speed rotating center thrust bearing, thrust ball bearing.
  • Ring and keep rolling in the correct position. Thrust ball bearing, thrust spherical roller bearing, and horizontal shaft.
  • Preloading method: the pre positioning of load is the preloading method that the relative position of Koyo imported bearing shaft will not change in use. Here is an example:
  • In order to implement the difference before the adjustment of the width between preloads or the fastening method after the axial clearance of bearings.
  • Adjust the size of the pad, gasket and bearing preload to make way.
  • The method adopted after tightening the screw and nut clearance with adjustable shaft direction. In this case, adjust the friction torque on the hand side with an appropriate preload to determine the start.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The so-called constant pressure preload is the use of coil springs and Belleville springs to give the load-bearing of appropriate preparation methods. When in use, even if the relative position of the Koyo inlet bearing changes, the preloading method. When in use, it will even change its relative position, and the preload can be maintained at a certain level.Lubrication mode of Koyo bearing and manufacturing principle of operation

Lubrication mode of Koyo bearing and manufacturing principle of operation

  • 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. Note: the engine oil is filtered before use.
  • 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 the application of small bearings.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • When inspecting Koyo imported bearings, never expose the bearings to pollutants or moisture. If the work is interrupted, the machine shall be covered with oil paper, plastic sheet or similar materials.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Tile surface corrosion: abnormal concentration of non-ferrous metal elements is found by spectral analysis; Submicron wear particles with many non-ferrous metal components appear in ferrography; The water content and acid value of lubricating oil exceed the standard.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Journal surface strain: there are ferrous cutting abrasive particles or black oxide particles in the ferrogram, and there is tempering color on the metal surface.
  • Journal surface corrosion: the spectral analysis found that the concentration of iron was abnormal. There were many submicron particles of iron in the ferrogram, and the water content or acid value of lubricating oil exceeded the standard.
  • Surface strain: cutting abrasive particles are found in the Ferrograph, and the abrasive particles are composed of non-ferrous metals.
  • Fretting wear of tile back: abnormal iron concentration is found by spectral analysis. There are many iron components, submicron wear particles, abnormal moisture and acid value of lubricating oil in the ferrogram.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Under the condition of liquid lubrication, the sliding surface is separated by lubricating oil without direct contact, which can also greatly reduce the friction loss and surface wear, and the oil film also has a certain vibration absorption ability
  • Oyo bearing faults are often due to a variety of factors, the influence of all design and manufacturing process factors and bearing faults, and their analysis is not easy to determine. Under normal circumstances, in general, you can consider and analyze factors and internal factors.
  • The main factors used for adjustment are installation, use and maintenance, maintenance and repair, which meet the technical requirements. The installation condition is one of the factors for using Koyo bearings. It is the primary factor of the load-bearing force that often causes the state change between various parts of the incorrect installation package, and the operation in abnormal state and early failure. Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Monitor and inspect the contact load, speed, temperature, vibration, noise and lubrication status of the operating bearing according to the technical requirements of bearing installation, use, maintenance and maintenance. If any abnormality is found, find the cause immediately and adjust it back to normal. In addition, the quality of oil and surrounding media and atmosphere are also very important for analysis and testing.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The chamfer of the bearing does not determine the quality of the bearing, but reflects the processing method of the bearing. The chamfering is black, which means that after quenching and other heat treatment, the hardness of the bearing can be improved.
  •  Some people think that the chamfering is black, which is not good-looking and is not completely processed. This is a misunderstanding.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The integrated cage is better than the two bodies. Although the new technology uses the integrated cage, it only saves materials, and its performance on rotation is worse than that of the two bodies. The chamfering of Koyo bearings does not determine the quality of the bearings. Some people think that the chamfering is black and unsightly because it is not completely processed. This is a misunderstanding.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Internal factors mainly refer to structural design, manufacturing process and materials. There are three factors that determine the quality of bearings.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • First of all, the structural design and advanced at the same time, there will be a longer Koyo bearing life. Bearing manufacturing will go through multiple processes of forging, heat treatment, turning, grinding and assembly. The rationality, advanced nature and stability of the treatment will also affect the service life of the bearing. Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The influence of bearing heat treatment and grinding process is often more directly related to bearing failure, which is related to product quality. In recent years, the deterioration of bearing surface layer shows that the grinding process is closely related to the bearing surface quality.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The metallurgical quality of bearing materials is the main factor affecting the early failure of rolling bearings. With the progress of Metallurgical Technology (such as bearing steel, vacuum degassing, etc.), the quality of raw materials has been improved. Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The proportion of raw material quality factor in bearing fault analysis has decreased significantly, but it is still one of the main factors of Koyo bearing failure. Whether the selection is appropriate or not is still a bearing fault analysis that must be considered.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Koyo bearing faults are often due to a variety of factors, all the design and manufacturing process factors and bearing faults, their analysis is not easy to determine. Under normal circumstances, in general, you can consider and analyze factors and internal factors.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The main factors used for adjustment are installation, use and maintenance, maintenance and repair, which meet the technical requirements. The installation condition is one of the factors for using Koyo bearings. It is the primary factor of the load-bearing force that often causes the state change between various parts of the incorrect installation package, and the operation in abnormal state and early failure. Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Monitor and inspect the contact load, speed, temperature, vibration, noise and lubrication status of the operating bearing according to the technical requirements of bearing installation, use, maintenance and maintenance. If any abnormality is found, find the cause immediately and adjust it back to normal. In addition, the quality of oil and surrounding media and atmosphere are also very important for analysis and testing.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The chamfer of the bearing does not determine the quality of the bearing, but reflects the processing method of the bearing. The chamfering is black, which means that after quenching and other heat treatment, the hardness of the bearing can be improved. Some people think that the chamfering is black, which is not good-looking and is not completely processed. This is a misunderstanding.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The integrated cage is better than the two bodies. Although the new technology uses the integrated cage, it only saves materials, and its performance on rotation is worse than that of the two bodies. Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The chamfering of Koyo bearings does not determine the quality of the bearings. Some people think that the chamfering is black and unsightly because it is not completely processed. This is a misunderstanding.
  • Internal factors mainly refer to structural design, manufacturing process and materials. There are three factors that determine the quality of bearings.
  • First of all, the structural design and advanced at the same time, there will be a longer Koyo bearing life. Bearing manufacturing will go through multiple processes of forging, heat treatment, turning, grinding and assembly. The rationality, advanced nature and stability of the treatment will also affect the service life of the bearing. Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The influence of bearing heat treatment and grinding process is often more directly related to bearing failure, which is related to product quality. In recent years, the deterioration of bearing surface layer shows that the grinding process is closely related to the bearing surface quality.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The metallurgical quality of bearing materials is the main factor affecting the early failure of rolling bearings. With the progress of Metallurgical Technology (such as bearing steel, vacuum degassing, etc.), the quality of raw materials has been improved. Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The proportion of raw material quality factor in bearing fault analysis has decreased significantly, but it is still one of the main factors of Koyo bearing failure. Whether the selection is appropriate or not is still a bearing fault analysis that must be considered.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Before inspection, clean the surface of the machine, and then remove the parts around the Koyo bearing. The oil seal is a very fragile part, so it needs to be disassembled carefully. Do not apply excessive force, and then carefully check the oil seal and its surrounding parts. If there are bad symptoms, be sure to replace it. The bad oil seal will lead to bearing damage and strict equipment shutdown.
  • After the installation of the bearing, in order to check whether the installation is correct, the operation inspection shall be carried out. Small machinery can be rotated by hand to confirm whether it rotates smoothly. Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The inspection items include poor operation caused by foreign matters, scars and indentation, unstable torque caused by poor installation and poor processing of mounting base, excessive torque caused by too small clearance, installation error and sealing friction, etc. If there is no abnormality, the power operation can be started.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Large machinery cannot rotate manually, so the power shall be cut off immediately after no-load start, and the machinery idles. Check whether there is vibration, noise, contact of rotating parts, etc. after confirming that there is no abnormality, enter the power operation.Lubrication mode of Koyo bearing and manufacturing principle of operation
Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Power operation, starting from no-load and low speed, slowly increase to the rated operation under the specified conditions. During the test run, the inspection items are whether there is abnormal sound, the change of Koyo bearing temperature, lubricant leakage or discoloration, etc. If any abnormality is found, stop the operation immediately, check the machinery, and remove the bearing for inspection if necessary.
  • The bearing temperature can generally be inferred from the external temperature of the bearing seat. However, it is more accurate to directly measure the temperature of the bearing outer ring by using the oil hole. The bearing temperature rises gradually from the beginning of operation, and the temperature is usually stable after 1 ~ 2 hours.Lubrication mode of Koyo bearing and manufacturing principle of operation
  •  If the bearing is not installed properly, the temperature will rise sharply, resulting in abnormal high temperature. The reasons are too much lubricant, too small bearing clearance, poor installation, excessive friction of sealing device, etc. In the case of high-speed rotation, the wrong selection of bearing structure and lubrication mode is also the reason.
  • The rotating sound of Koyo bearing is checked with stethoscope, and there are strong metal noise, abnormal sound, irregular sound and other indications of abnormality. The reasons are poor lubrication, poor accuracy of shaft or bearing seat, bearing damage, foreign matter intrusion, etc.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • When inspecting the bearing, never 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.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • If it is possible to clean the naked bearing without disassembly, clean it with a brush coated with white spirit, and then dry it with a piece of lint free cloth or blow dry with compressed air (be careful not to start the rotation of the bearing assembly).
  • The bearing cover can not be cleaned; Just wipe the outer surface. If the bearing is damaged, it needs to be replaced. Replacing Koyo bearings during regular downtime maintenance is much more economical than the loss of sudden shutdown due to array bearing damage
  • A satisfactory Koyo bearing life begins with the correct bearing selection. From the beginning, bearing designers extended bearing life and equipment performance by selecting the right bearings for different applications. Many factors should be considered in this process, such as load, hardness, bearing life prediction, operating environment and so on.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • In principle, all bearings should be kept in their original packaging before installation. They need to stay in a clean, moisture-free, relatively constant temperature environment. Rolling bearings should be kept away from dust, water and corrosive chemicals. Shaking and vibration may permanently damage the mechanical properties of the bearing, so vibration must be avoided during handling and storage.
  • Basically, all Koyo bearings must be stored horizontally, because some heavier bearings may be deformed due to their own weight after being placed vertically for a long time.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Pre greased (or sealed) bearings require special care because the density of the grease will change after long-term storage. In this way, when the bearing is used again, there will be a certain degree of rotation noise. Therefore, the shelving time of this bearing should be controlled according to the principle of first in first out.
  • In the process of normal operation, how to properly lubricate the bearing is also an important link in bearing maintenance.
  • Oil bath smoothing is a common smoothing method in bearings, which is suitable for the smoothing of low and medium speed bearings. Partially immerse the Koyo bearing in the groove, and the smooth oil is brought up by the rotating bearing parts and then flows back to the oil groove. The oil level should be slightly lower than the center of the low rolling element.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • Smooth oil dripping is suitable for bearing parts requiring quantitative supply of smooth oil. The amount of oil dripping should be one drop every 3-8 seconds. Too much oil will increase the bearing temperature.
  • Use the oil pump to deliver the filtered oil to the bearing parts, and then filter and cool the smooth oil after passing through the bearing. Because the circulating oil can take away certain heat and cool the bearing, this method is actually used for bearing parts with high speed.
  • Oil mist is produced by mixing the dry shrinkage air with the smooth oil through the spray. The airflow can effectively cool the bearing and avoid impurity invasion in the bearing. This method is suitable for the smoothing of high-speed and low-temperature bearing parts.
  • Use the oil pump to inject the low-pressure oil into the bearing through the nozzle, and the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at a high speed, the rolling element and the maintenance frame also cause air flow around at a relatively high rotation speed.
  •  It is difficult to send the smooth oil to the bearing in an individual smooth way. At this time, the smooth oil must be sprayed into the Koyo bearing in the way of low-pressure radiation, and the position of the nozzle should be placed between the inner ring and the center of the maintenance frame.Lubrication mode of Koyo bearing and manufacturing principle of operation
  • The state of ina imported bearings is directly related to the operation state of rotating equipment. Bearings are widely used in equipment. Therefore, it is important to do a good job in the condition monitoring and maintenance of large-scale rotating equipment, especially in the practical application of large-scale production equipment. Through temporary practice and exploration, some practical skills of bearing actual fault diagnosis have been accumulated.

  • Vibration analysis is a practical method for condition monitoring and fault diagnosis of ina imported bearings. Attention must be paid to the accuracy and authenticity of the collected signals. In practice, attention should be paid to the selection of the location of measuring points and acquisition methods. To truly and accurately reflect the bearing vibration state. Therefore, it is necessary to arrange measuring points near the bearing. The free end of the motor is generally provided with a rear fan cover, and the measuring points are selected in the fixing screws of the fan cover, which has a good monitoring effect. In addition, it is necessary to collect and analyze the vibration signals for many times and compare them comprehensively. Ability to draw accurate conclusions.

  • Ina imported bearing shows a strong regularity in its use, which is found in the temporary production condition monitoring. And the repeatability is very good. When the normal high-quality bearing is put into use, the vibration and noise are relatively small, but the spectrum is somewhat scattered and the amplitude is small, which may be caused by some defects in the manufacturing process, such as surface burrs.

  • Vibration and noise maintain a certain level after exercise for a period of time. The spectrum is very single, with only one or two frequency doubling. The frequency spectrum above three times of power frequency rarely appears, and the bearing state is very stable and enters the stable working period.

  • The vibration and noise of the bearing began to increase and entered the later stage of use after continued operation. Sometimes there is abnormal sound, but the vibration increases slowly. At this time, the kurtosis value of the bearing suddenly reaches a certain value. It is considered that the bearing at this time is an initial fault.

  • It is required to closely monitor the bearing. Pay close attention to its changes. Then, the bearing kurtosis value began to decline rapidly and close to the normal value, while the vibration and noise began to increase significantly, and the increase amplitude began to accelerate. When the vibration exceeded the vibration specification (such as ISO2372 specification), the bearing kurtosis value also began to increase rapidly. When the vibration specification was exceeded and the kurtosis value also exceeded the normal value (kurtosis relative standard available), it was considered that the imported bearing of ina had entered the late fault production, and the equipment needed to be repaired in time, Replace the bearing.

  • The larger the equipment capacity, the bearing shows the characteristics of late failure, and the time from the occurrence of serious failure (generally bearing damage, such as shaft holding, burn, sand frame crack, raceway, bead wear, etc.) is usually less than one week. The faster the speed, the shorter the interval. Therefore, in the actual bearing fault diagnosis, once the late fault characteristics are found, the bearing fault should be determined and the maintenance should be arranged as soon as possible.
  • The assembly quality index of ina imported bearings, that is, the assembly accuracy requirements are mainly radial clearance and width. There is a certain functional relationship between axial clearance and radial clearance. Therefore, the axial clearance can be indirectly controlled by controlling the radial clearance.
  • For deep groove ball bearings, cylindrical roller bearings, self-aligning ball bearings and self-aligning roller bearings, the radial clearance is mainly controlled.
  • For thrust ball bearing, thrust roller bearing and tapered roller bearing, the height and width are mainly controlled.
  • For agular contact ball bearings, the contact angle is mainly controlled.
  • The basic requirements of rolling bearing assembly are: on the premise of ensuring the assembly quality index, the sleeve rate should be high, which should generally be more than 95%.
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