Common damage causes affecting the service life of IKO needle roller bearing
Common damage causes affecting the service life of IKO needle roller bearing
2022年4月3日
Methods to avoid vibration during operation of fag outer spherical bearing
Methods to avoid vibration during operation of fag outer spherical bearing
2022年4月3日

Solution to heating damage and judgment of fag thrust ball bearing

  • The shaft parts of machine tools, especially the spindle, are generally assembled with rolling bearings or sliding bearings and rotate at a high speed, sometimes generating high heat.
  •  If this phenomenon is not eliminated in time, it will cause the fag bearing to overheat and cause the temperature of the corresponding parts of the machine tool to rise, resulting in thermal deformation.
  •  In serious cases, the height of the spindle and tailstock will be unequal, which will not only affect the accuracy and machining accuracy of the machine tool itself, but also burn out the bearing.Solution to heating damage and judgment of fag thrust ball bearing

Solution to heating damage and judgment of fag thrust ball bearing

  • Generally, if the thrust ball bearing is used correctly, it can be used until the fatigue life is reached. However, there will be accidental and premature damage, which can not be resistant to use. This early damage, as opposed to fatigue life, is the quality service limit called failure or accident. 
  • Most of them are caused by careless installation, use and lubrication, foreign matters invading from the outside, and insufficient research on the thermal effects of shafts and shells.Solution to heating damage and judgment of fag thrust ball bearing
  • As for the damage state of the bearing, such as the clamping damage of the ferrule and retaining edge of fag bearing, these reasons can be considered. 
  • These reasons also coincide with insufficient lubricant, unfitness, defects of oil supply and drainage structure, invasion of foreign matters, bearing installation error and excessive deflection of the shaft.Solution to heating damage and judgment of fag thrust ball bearing
  • Therefore, only investigating the bearing damage, it is difficult to know the real cause of the damage. However, if we know the use machinery and conditions of the bearing, the structure around the bearing, understand the situation before and after the accident, and investigate the damage state of the bearing and several causes, we can prevent the recurrence of similar accidents.
  • The judgment of whether the bearing is available is mainly determined by considering the damage degree, mechanical performance, importance, operating conditions and the period until the next maintenance of the thrust ball bearing. 
  • If there are the following defects, it can no longer be used, and the fag bearing must be replaced with a new one. There are cracks or notches on any one of the inner ring, outer ring, rolling element and cage.
  • Solution to heating damage and judgment of fag thrust ball bearing
  • 1. Any one of the ferrule and rolling element is broken.Solution to heating damage and judgment of fag thrust ball bearing
  • 2. There are significant card injuries on the rolling track surface, retaining edge and rolling body.
  • 3. Significant wear of cage or significant relaxation of rivets.
  • 4. There is rust and damage on the raceway surface and rolling element.Solution to heating damage and judgment of fag thrust ball bearing
  • 5. There are serious indentations and scratches on the raceway surface and rolling element.
  • 6. There is obvious creep on the inner diameter surface of the inner ring or the outer diameter surface of the outer ring.
  • 7. Discoloration caused by heat is obvious.Solution to heating damage and judgment of fag thrust ball bearing
  • 8. The bearing, sealing ring or dust cover sealed with grease is obviously damaged.Solution to heating damage and judgment of fag thrust ball bearing
Solution to heating damage and judgment of fag thrust ball bearing
  • Generally speaking, the temperature of the combined bearing will rise after it starts to operate. After a period of time, it will be normal at a lower temperature (usually 10 ~ 40 degrees higher than the room temperature).
  • The time to normal varies according to the size, form, rotation speed and lubrication method of IKO bearing, and the heat release conditions around the imported bearing. At this time, it takes about 20 minutes to several hours.
  • When the bearing temperature does not reach normal and abnormal temperature rise occurs, the following reasons can be considered. In addition, shut down as soon as possible and take necessary countermeasures. Temperature is very important to maintain the proper service life of imported bearings and prevent the deterioration of lubricating oil. 
  • It is recommended to control it under non high temperature (generally below 100 ℃) as much as possible. The main reason for abnormal temperature rise is too much or too little lubricating oil. The IKO bearing is poorly installed. 
  • The internal clearance of the combined bearing is too small or the load is too large. Excessive friction of sealing device. Lubricant does not match. Creep of mating surface.
  • Secondly, check the raceway surface of the bearing, the condition of the rolling surface and joint surface, as well as the wear condition of the confrontation frame for damage and abnormal conditions. 
  • In particular, check the running track of the raceway surface. To judge whether the bearing can be used again, we should think about the damage level of the combined bearing, mechanical function, priority, operation premise, search and inspection cycle, etc.
Technical requirements for Timken non-standard bearing