Methods and diagnostic techniques for identifying whether ina non-standard bearings can be reused
Methods and diagnostic techniques for identifying whether ina non-standard bearings can be reused
2022年4月7日
Criteria and treatment methods for judging fault damage of ina supercharger bearing
2022年4月7日

Solutions to common faults of ina stainless steel bearing

  • When the mechanism is running, the part where ina bearing is installed is allowed to have a certain temperature. When touching the mechanism shell by hand, it should be normal not to feel hot. Otherwise, it indicates that the bearing temperature is too high.Solutions to common faults of ina stainless steel bearing

Solutions to common faults of ina stainless steel bearing

  • The reasons for high bearing temperature include: the quality of lubricating oil does not meet the requirements or deteriorates, and the viscosity of lubricating oil is too high; The mechanism assembly is too tight (insufficient clearance); The assembly of stainless steel bearing is too tight; The bearing race rotates on the shaft or in the shell; Excessive load; Broken bearing cage or rolling element, etc.Solutions to common faults of ina stainless steel bearing
  • The rolling bearing is allowed to make slight running noise during operation. If the noise is too loud or there is abnormal noise or impact sound, it indicates that the bearing is faulty.Solutions to common faults of ina stainless steel bearing
  • The causes of rolling bearing noise are complex. One is the wear of the mating surfaces of the inner and outer rings of the bearing. Due to this kind of wear, the matching relationship between bearing and shell, stainless steel bearing and shaft is damaged, resulting in the axis deviation from the correct position and abnormal noise when the shaft moves at high speed. Solutions to common faults of ina stainless steel bearing
  • When ina bearing is tired, its surface metal will peel off, which will also increase the radial clearance of the bearing and produce abnormal noise. In addition, insufficient bearing lubrication, dry friction and bearing breakage will produce abnormal sound. After the bearing is worn and loosened, the cage is loose and damaged, which will also produce abnormal noise and damage to the bearing.Solutions to common faults of ina stainless steel bearing
Solutions to common faults of ina stainless steel bearing
  • 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.Solutions to common faults of ina stainless steel bearing
  • 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.Solutions to common faults of ina stainless steel bearing
  •  Surface strain: cutting abrasive particles are found in the Ferrograph, and the abrasive particles are composed of non-ferrous metals.Solutions to common faults of ina stainless steel bearing
  • 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.Solutions to common faults of ina stainless steel bearing
  • Impact sound of rolling element and its control method when the ball bearing or 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.Solutions to common faults of ina stainless steel bearing
  • 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 stainless steel bearings. Solutions to common faults of ina stainless steel bearing
  • The general 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 sound pressure level increases with the speed.Solutions to common faults of ina stainless steel bearing
Solutions to common faults of ina stainless steel bearing
  • Small foreign matters may enter the bearing due to excessive grinding. Sand particles, metal particles produced during grinding and machining, and metal particles or carbides brought by gears will wear or grind rollers and raceways. In the universal joint bearing, the wear degree of the roller end face and the inner ring retaining edge is more serious than that of the raceway. Solutions to common faults of ina stainless steel bearing
  • This kind of wear can cause the expansion of axial clearance or internal clearance, and then reduce the fatigue life of the bearing, resulting in the eccentricity of the bearing. In addition, wear can affect other parts of the machine where the bearing is located.Solutions to common faults of ina stainless steel bearing
  • When taking the bearing directly by hand, fully wash the sweat from your hands and apply high-quality mineral oil before operation. Pay special attention to rust prevention in rainy season and summer.Solutions to common faults of ina stainless steel bearing
  • Under some special operating conditions, the bearing can obtain a longer life than the traditional calculation, especially under light load. These special operating conditions are the surface damage that may be caused when the rolling surface (track and rolling parts) is effectively separated and limited by a lubricating oil film. In fact, under ideal conditions, the so-called permanent bearing life is not impossible
  •  While accurately determining the positioning of the radial mark and axial mark of the shaft, lift and stop the runout of the shaft.Solutions to common faults of ina stainless steel bearing

Improve the rigidity of universal joint bearing.

  • The purpose of preventing the axial mark from vibration and homophony caused by resonance.Solutions to common faults of ina stainless steel bearing
  • Lift and stop the torsional sliding, revolution sliding and rotation sliding of the rolling element.Solutions to common faults of ina stainless steel bearing
  • Take the ferrule and connect the accurate position of the rolling element.
  • Foreign matters may enter the bearing through the severely worn or failed sealing ring. The initial cleaning of bearing pedestal and parts is not clean, or the filter fails, and the filter is not maintained properly, which will lead to the accumulation of abrasive particles.Solutions to common faults of ina stainless steel bearing
  • Hard particles rolling in the universal joint bearing can cause pitting and scratch of the roller and raceway. The residual metal fragments or large particles of dust caused by improper cleaning of the bearing seat will lead to premature fatigue damage.Solutions to common faults of ina stainless steel bearing
Solutions to common faults of ina stainless steel bearing
  • In the case of premature failure of all ina bearings, about 16% are caused by improper or incorrect installation. Various applications may require machinery, proper thermal or hydraulic devices and effective installation of oil-free bearings. Choosing the appropriate installation method of the application will help you prolong the service life of the bearing and reduce the cost caused by premature failure and potential damage of the bearing.
  • The bearings are usually heated in an oil bath before installation. However, this method may be caused by contaminated bearings and premature failure of oil-free bearings. Induction heating is a common heating method. Because of its controllability, the efficiency and of bearing are very high. Ina imported bearing induction heater application development standard. The bearing induction heater has many functions to help prevent damage to the bearings during heating.
  • In fact, if each specific use, a sufficient number of bearing life tests have been taken to verify whether it is suitable for the economic time and labor of the selected bearing. Therefore, the bearing life test method is necessary or important. In most cases, in the case before use, a standard calculation method to estimate the life of ina bearing life has sufficient reliability level.
  • Maintenance and judgment of bearing: determine whether it can be used to check ina bearing after cleaning and remove the bearing. Check the raceway, raceway, surface condition, cage wear, oil-free bearing clearance and improvement of dimensional accuracy, irrelevant damage and abnormality. Non separable small ball bearing, inner ring, support level with one hand, rotate the outer ring to confirm smooth. 
  • Tapered roller bearings, such as separable bearings, can roll the body, and the outer race raceway surface has been inspected. For large bearings, because they cannot rotate by hand, pay attention to check the raceway, cage and wall of the rolling element, such as appearance. For the importance of higher bearings, they should be checked more carefully.
  • When inspecting the rivet head, the main observation is whether there is a relationship between skew and loose welding position is incorrect. Welding quality. Whether the welding point is too small, whether there is welding or welding, the problem caused by solid ball card. Bearing testing requires special attention in the process. There are also some problems that need attention.
  • The secondary inspection of the environment of oil-free bearing should be in the light environment, which is astigmatism, so as to better observe the appearance of INA Bearing on the surface and there are no cracks and other abnormalities. In the process of cloud like mechanical wear, scratches and touch pressure, the bearing equipment will lead to displacement, poor equipment position, flat bearing shape, load and stress concentration, and reduce accuracy and service life.
  • The load exceeding ina bearing is the main cause of bearing damage. Corrosion is easy to develop into the corrosion of rolling mill bearing, which is the pollution source of early wear and fatigue. Serious fatigue damage will lead to the scrapping of bearing.
  • In general, the metal fatigue on the rolling contact surface of ina bearing is the main cause of rolling bearing damage. Therefore, for a specific application, based on rolling fatigue is enough to select the appropriate rolling mill bearing and size. The international standard ISO281 is based on the rolling contact surface of metal fatigue.
  •  But more importantly, what should be done is that there may be some cages, lubricants and seals. Ina bearings play the same role in their life cycle durability, because in some cases, it plays a leading role in a complete bearing system. In theory, when all components come to the same life, it is the ideal working life. In other words, bearing life calculation to achieve the actual working life, the working life of its components must at least calculate the bearing life.
  • The rated load of ina bearing is expressed by the size and nature of the load received by the rolling mill bearing. If its value exceeds the rated load of the bearing, such as the size and direction of the load, and whether the load received by the bearing is one-way or two-way, it will cause bearing fatigue damage. When inspecting the INA Bearing removed during the regular maintenance and operation of bearing equipment and the replacement of peripheral parts, pay attention to the precautions for bearing disassembly and assembly. It is necessary to judge whether the bearing parts of the secondary rolling mill can be reused and record the good or bad use.
Solutions to common faults of ina stainless steel bearing