Effect of Timken imported bearing quality on temperature and vibration
Effect of Timken imported bearing quality on temperature and vibration
2022年4月13日
Five points for correct installation and adjustment of low noise NTN bearings
Five points for correct installation and adjustment of low noise NTN bearings
2022年4月13日

Methods for noise inspection and maintenance of one-way bearing

  • Generally, the temperature of the bearing starts to rise slowly with the operation of the imported bearing, and reaches a stable state after 1-2 hours. The normal temperature of Timken bearing varies with the heat capacity, heat dissipation, speed and load of the machine.

 Methods for noise inspection and maintenance of one-way bearing

  • If the lubrication and installation parts are appropriate, the sliding bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.Methods for noise inspection and maintenance of one-way bearing
  • The thermal sensor can monitor the working temperature of the bearing at any time, and automatically alarm or stop when the temperature exceeds the specified value to prevent the occurrence of combustion shaft accident.Methods for noise inspection and maintenance of one-way bearing
  • High temperature often indicates that it is in an abnormal situation. High temperatures are also harmful to the lubricants of sliding bearings. Sometimes Timken bearing overheating can be attributed to the lubricant of the bearing. 
  • If the bearing temperature exceeds 125 ℃ for a long time, the bearing life 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.Methods for noise inspection and maintenance of one-way bearing
  • Therefore, it is necessary to continuously monitor the bearing temperature, 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.
  • The periodic measurement of bearing temperature can be aided by thermometer, such as digital thermometer, which can accurately measure the bearing temperature and display it in ℃ or Fahrenheit.Methods for noise inspection and maintenance of one-way bearing

1. Wear failure

  • Wear failure refers to the failure caused by the continuous wear of the metal on the working surface caused by the relative sliding friction between the surfaces. Continuous wear will cause gradual damage to bearing parts, and eventually lead to the loss of dimensional accuracy of sliding bearing and other related problems. 
  • Wear may affect the change of shape, the increase of fit clearance and the change of working surface morphology, may affect the lubricant or make it polluted to a certain extent, resulting in the complete loss of lubrication function, so that Timken bearing loses its rotation accuracy and even can not operate normally. Methods for noise inspection and maintenance of one-way bearing
  • Wear failure is one of the common failure modes of various bearings. According to the wear form, it can be divided into common abrasive wear and adhesive wear.
What should be paid attention to in order to prolong the life cycle of outer spherical bearing

2. Contact fatigue failure

  • Contact fatigue failure refers to the failure of bearing working surface caused by alternating stress. Contact fatigue spalling occurs on the working surface of sliding bearing, which is often accompanied by fatigue cracks.Methods for noise inspection and maintenance of one-way bearing
  •  It first occurs from the large alternating shear stress below the contact surface, and then extends to the surface to form different spalling shapes, such as pitting or pitting spalling, which is called shallow spalling. Due to the gradual expansion of the spalling surface, it often expands to the deep layer, forming deep spalling. Deep spalling is the fatigue source of contact fatigue failure.Methods for noise inspection and maintenance of one-way bearing

3. Fracture failure

  • The main reasons for the fracture failure of Timken bearing are defect and overload. When the external load exceeds the material strength limit and causes the part to break, it is called overload fracture. The main cause of overload is the sudden failure or improper installation of the host.Methods for noise inspection and maintenance of one-way bearing
  •  Defects such as microcracks, shrinkage cavities, bubbles, large foreign objects, overheated tissue and local burns of sliding bearing parts will also cause fracture at the defect during impact overload or violent vibration, which is called defect fracture. Methods for noise inspection and maintenance of one-way bearing
  • It should be pointed out that in the manufacturing process of sliding bearing, the presence of the above defects can be correctly analyzed by instruments in the factory re inspection of raw materials, quality control of forging and heat treatment and processing process control, and the control must still be strengthened in the future. But generally speaking, most of the bearing fracture failures are overload failures.Methods for noise inspection and maintenance of one-way bearing

4. Clearance change failure

  • During the operation of sliding bearing, due to the influence of external or internal factors, the original matching clearance is changed, the accuracy is reduced, and even “bite” is called clearance change failure. Methods for noise inspection and maintenance of one-way bearing
  • External factors such as excessive interference, improper installation, expansion caused by temperature rise, instantaneous overload, etc., and internal factors such as residual austenite and residual stress in an unstable state are the main reasons for the change and failure of clearance.Methods for noise inspection and maintenance of one-way bearing
Common problems and precautions in selecting and using Timken bearings
  • In order to maintain the original performance of NSK bearing in good condition for as long as possible, it is necessary to maintain and repair in order to prevent accidents, ensure the reliability of operation and improve productivity and economy. Methods for noise inspection and maintenance of one-way bearing
  • Maintain the operation standard of corresponding mechanical operation conditions and carry out it regularly. Methods for noise inspection and maintenance of one-way bearing
  • The contents include the inspection of monitoring the operation status, supplementing or changing the lubricant, and regular disassembly. As a maintenance item in operation, there are rotating sound, vibration, temperature, lubricant state of angular contact ball bearing, etc.Methods for noise inspection and maintenance of one-way bearing
  • Bearing cleaning: when disassembling the lower bearing for maintenance, first record the appearance of the 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.Methods for noise inspection and maintenance of one-way bearing
  • The cleaning of the removed bearing is divided into coarse cleaning and fine cleaning. They are placed in the container respectively. First, put the metal mesh bottom so that the bearing does not directly contact the dirt of the container. Methods for noise inspection and maintenance of one-way bearing
  • During rough cleaning, if the 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.Methods for noise inspection and maintenance of one-way bearing
  • Fine cleaning is to carefully clean NSK bearing while rotating in cleaning oil. In addition, the cleaning oil should always be kept clean.Methods for noise inspection and maintenance of one-way bearing
  • Maintenance and judgment of bearing: in order to judge whether the disassembled bearing can be used, it shall be checked after the angular contact ball bearing is cleaned. Check the state of raceway surface, rolling surface and mating surface, the wear of cage, the increase of bearing clearance and the damage of irrelevant dimensional accuracy, which are abnormal.Methods for noise inspection and maintenance of one-way bearing
  •  For non separable small ball bearings, support the inner ring horizontally with one hand and rotate the outer ring to confirm whether it is smooth.Methods for noise inspection and maintenance of one-way bearing
Methods for noise inspection and maintenance of one-way 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 articulated bearings, the basic external conditions of the operation of imported ina bearings should be monitored frequently, such as the measurement of temperature, vibration and noise, so as to prevent accidents.Methods for noise inspection and maintenance of one-way bearing
  • 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, after the joint bearing is installed, if it is not carefully aligned, the alignment may cause the bearing to suffer additional load, friction and vibration. As a result, the bearing is damaged prematurely, so it should be aligned and straightened!Methods for noise inspection and maintenance of one-way bearing
  • If the bearing considers lubrication, the lubricity of oil lubrication is dominant. However, grease lubrication can simplify the advantages of the surrounding structure of imported ina bearings. In the process of operation, the bearing requires correct re lubrication, which can make the bearing operate healthily.Methods for noise inspection and maintenance of one-way bearing
  •  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!Methods for noise inspection and maintenance of one-way bearing
  • Use proper tools for removal, which will help prevent damage to other machine components. Incorrect removal technology may cause damage to the bearing. If the bearing reaches its final service life, it should be replaced.Methods for noise inspection and maintenance of one-way bearing
  •  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
  • The working temperature of the moving bearing can be monitored at any time by using the thermal sensor, and the automatic alarm or rest can be realized when the temperature exceeds the specified value to prevent the occurrence of combustion shaft accidents. High temperature often indicates that the imported ina bearing has been in an abnormal condition.Methods for noise inspection and maintenance of one-way bearing
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