Cleaning process and precautions of electric NSK bearing
Cleaning process and precautions of electric NSK bearing
2022年6月9日
What are the causes of IKO thrust tapered roller bearing heating failure
What are the causes of IKO thrust tapered roller bearing heating failure
2022年6月11日

IKO roller bearing operation condition judgment quality problem

IKO roller bearing operation condition judgment quality problem

 
  • Uneven pits appear on the contact surface between the raceway and the roller of IKO bearing, indicating that the roller bearing produces plastic deformation. The reason is that the local stress on the working surface of the bearing exceeds the yield limit of the material under the action of large static load or impact load. This usually occurs on the bearing rotating at low speed.
  • Rolling bearings are precision components, and their use must be carried out with corresponding caution. No matter how high-performance IKO bearings are used, if they are not used properly, the expected high performance will not be obtained. Precautions for the use of roller bearings are as follows.
  • Keep the bearings and their surroundings clean
  • Even if the invisible dust enters the bearing, it will increase the wear, vibration and noise of the bearing. The bearing and its surrounding accessories shall be kept clean, especially the dust and dirt. The tools and working environment must also be kept clean.IKO roller bearing operation condition judgment quality problem
  • Use and install carefully 
  • IKO roller bearing operation condition judgment quality problem
  • It is not allowed to punch with force, directly knock the roller bearing with a hammer, or transmit pressure through the rolling element.IKO roller bearing operation condition judgment quality problem
  • Use proper and accurate installation tools
  • Try to use special tools, and try to avoid using cloth and short fibers.
  • Prevent bearing corrosion
  • When the IKO bearing is directly taken by hand, the sweat on the hand shall be fully washed off, and the operation shall be carried out after being coated with high-quality mineral oil. In rainy seasons and summer, special attention shall be paid to rust prevention. IKO roller bearing operation condition judgment quality problem
IKO roller bearing operation condition judgment quality problem

Use proper and accurate IKO roller bearing

  • However, under certain special operating conditions, the service life of the roller bearing can be longer than that of 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 possible.IKO roller bearing operation condition judgment quality problem
  • The causes of high-temperature IKO bearings include insufficient or excessive lubrication, magazines in the lubricant, excessive load, damage to roller bearings, insufficient clearance, and high-temperature friction caused by oil seals.IKO roller bearing operation condition judgment quality problem
  • Both the bearing rolling element and the inner and outer race raceways are subject to periodic fluctuating loads, resulting in periodic contact stress. When the number of stress cycles reaches a certain value, fatigue spalling will occur on the rolling element or the inner and outer race raceways. IKO roller bearing operation condition judgment quality problem
  • If the load of the bearing is too large, this fatigue will be aggravated. In addition, the bearing is improperly installed and the shaft is bent, It will also produce the phenomenon of raceway spalling. The fatigue spalling of IKO bearing raceway will reduce the operating accuracy of the shaft and cause vibration and noise of the mechanism.IKO roller bearing operation condition judgment quality problem
  • The reasons for the burn of the burned roller bearing with the return fire color on the raceway and rolling element are generally insufficient lubrication, the quality of the lubricating oil does not meet the requirements or deteriorated, and the assembly of the IKO bearing is too tight. IKO roller bearing operation condition judgment quality problem
  • Due to the size limitation of IKO bearings, we are generally limited by space when installing bearings. In many cases, the inner diameter of the bearing is limited according to the mechanical design. Therefore, in the selection of the type and size of rolling bearings, we all choose which bearing according to the inner diameter of the bearing. Therefore, the main dimensions of bearings are marked according to international standards.IKO roller bearing operation condition judgment quality problem
  • Scale IKO bearings have various sizes and forms, and scale bearings are used in the design of mechanical devices.IKO roller bearing operation condition judgment quality problem
  • Its nature, size and direction are changeable. In general, the rated base load is shown on the dimension table. However, axial load and radial load are also important factors in selecting suitable bearings. When the size of ball and needle roller bearings are matched, needle roller bearings usually have high load capacity and bear large vibration and impact loads.IKO roller bearing operation condition judgment quality problem
  • In terms of IKO bearing speed, the bearing is determined according to the bearing type, size, accuracy, cage type, load, lubrication method, cooling method and other factors.IKO roller bearing operation condition judgment quality problem
  • In some cases, preloading shall be applied to rolling bearings to increase rigidity. This procedure is usually used for inner and outer ring offset of deep groove ball bearings, centripetal thrust ball bearings and tapered roller bearings, shaft bending, change of shaft or bearing housing tolerance, and incorrect fitting will lead to eccentricity of inner and outer rings. IKO roller bearing operation condition judgment quality problem
  • To prevent excessive eccentric angle, self-aligning ball bearing, self-aligning roller bearing, or self-aligning bearing seat are better choices. Voice frequency and torque, dynamic bearings are manufactured according to high-precision standards, so voice and torque are small. Deep groove ball bearings and cylindrical roller bearings are used for occasions with special requirements for low noise and low torque.IKO roller bearing operation condition judgment quality problem
  • Bearing tolerance, bearing dimensional accuracy and rotation accuracy are based on ISO and JIS standards. For machines requiring high accuracy and high-speed operation, it is recommended to use bearings with accuracy of grade 5 or above. IKO roller bearing operation condition judgment quality problem
  • Deep groove ball bearings, radial thrust ball bearings or cylindrical roller bearings are suitable for machines with high operation accuracy. Rigidity, when the contact surface between the moving elastic body and the raceway of the bearing is under pressure, it will produce elastic deformation. Some machines need to minimize elastic deformation. Roller bearings produce less elastic deformation than ball bearings.IKO roller bearing operation condition judgment quality problem
  • For the installation and disassembly of bearings, they need to be removed and installed frequently in specific applications to ensure that they can be inspected and repaired according to their location. Bearings with separate inner and outer rings, such as cylindrical bearings, needle roller bearings, and tapered bearings, are very suitable for this occasion. IKO roller bearing operation condition judgment quality problem
  • With the help of the shaft sleeve, the installation procedure of the taper hole type self-aligning ball bearing and self-aligning roller bearing is also simplified.IKO roller bearing operation condition judgment quality problem

After continuous operation IKO roller bearing

  • Key factors affecting the service life of ina bearings for many rotating machinery products, their service life mostly depends on the service life of bearing components in key parts of the product. “Maintenance free” bearings do not mean that the bearings will never be damaged or fail, but that they will not be damaged within a certain period of time. IKO roller bearing operation condition judgment quality problem
  • Here, the designers have calculated the service life of the outer spherical bearing. The service life of the bearing is greater than or equal to the overhaul cycle of the mechanical product, so that the bearing can be “maintenance free” and the used bearing can be replaced at the same time of the overhaul of the mechanical product without maintenance.IKO roller bearing operation condition judgment quality problem
  • After continuous operation, in the later period of service, the vibration and noise of INA Bearing began to increase, and sometimes abnormal sound occurred, but the vibration increased slowly. At this time, the bearing kurtosis began to suddenly reach a certain value. We believe that the bearing shows initial failure at this time.IKO roller bearing operation condition judgment quality problem
  • First of all, we want to emphasize that it is very important to keep the outer spherical bearing lubricated and clean. So before we inspect the bearing, we should clean the surface of the bearing first, and then disassemble the parts around the bearing. It should be noted that the oil seal is a very fragile part, so extra care should be taken during inspection and disassembly. IKO roller bearing operation condition judgment quality problem
  • Do not apply excessive force to avoid damage to the parts. Then carefully check the oil seal of the bearing and its surrounding parts. If there are bad symptoms, be sure to replace them. The bad oil seal will cause damage to INA Bearing, make the bearing cloud abnormal and cause equipment shutdown.
  • Secondly, we should check the lubricant of the bearing. Lubrication is very important, not only for bearings, but also for all bearings. However, please note that the outer spherical bearing should not be greased too much.
  • Rub between your fingers with a little lubricant. If there are pollutants, you can feel them; Or apply a thin layer of lubricant on the back of the hand, and then perform light sealing inspection.
  • After draining the old engine oil from the bearings lubricated with engine oil, if possible, refill fresh engine oil and let the machine rotate at low speed for several minutes. Make the oil collect residual pollutants as much as possible, and then drain the oil. IKO roller bearing operation condition judgment quality problem
  • Note: the engine oil is filtered before use. When replacing the grease of the grease lubricated outer spherical bearing, the arbor used should avoid any part of the bearing with cotton joint angle. Because these residual fibers may wedge between the rolling parts and cause damage, especially in the application of small bearings.IKO roller bearing operation condition judgment quality problem
  • INA Bearing shows late fault characteristics. The time from the occurrence of serious fault (generally bearing damage, such as shaft holding, burning, sand frame spalling, raceway, bead wear, etc.) is usually less than one week. The larger the equipment capacity, the faster the rotating speed, and the shorter the interval. Therefore, in the actual bearing fault diagnosis, once the late fault features are found, the bearing fault should be determined and the maintenance should be arranged as soon as possible.IKO roller bearing operation condition judgment quality problem
  • The reasons for the noise of rolling bearings are complex. One is the wear of the mating surfaces of the inner and outer rings of bearings. Due to this kind of wear, the matching relationship between the bearing and the shell, the bearing and the shaft is damaged, resulting in the axis deviation from the correct position and abnormal noise when the shaft moves at high speed. IKO roller bearing operation condition judgment quality problem
  • When the outer spherical bearing is fatigued, 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 INA 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.IKO roller bearing operation condition judgment quality problem
  • During the operation of the mechanism, a certain temperature is allowed at the part where the bearing is installed. When touching the mechanism shell with hands, it is normal to feel that it is not hot. Otherwise, it indicates that the bearing temperature is too high.IKO roller bearing operation condition judgment quality problem
  • 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 outer spherical bearing is assembled too tightly; The bearing race rotates on the shaft or in the shell; Excessive load; Broken bearing cage or rolling element, etc.IKO roller bearing operation condition judgment quality problem
  • The vibration system composed of stiffness, flexibility, mass, damping, etc. determined by INA Bearing structural design parameters will produce vibration corresponding to its mechanics under operating conditions.IKO roller bearing operation condition judgment quality problem
  • Key factors affecting the service life of ina bearings for many rotating machinery products, their service life mostly depends on the service life of bearing components in key parts of the product. “Maintenance free” bearings do not mean that the bearings will never be damaged or fail, but that they will not be damaged within a certain period of time. IKO roller bearing operation condition judgment quality problem
  • Here, the designers have calculated the service life of the outer spherical bearing. The service life of the bearing is greater than or equal to the overhaul cycle of the mechanical product, so that the bearing can be “maintenance free” and the used bearing can be replaced at the same time of the overhaul of the mechanical product without maintenance.IKO roller bearing operation condition judgment quality problem
  • After continuous operation, in the later period of service, the vibration and noise of INA Bearing began to increase, and sometimes abnormal sound occurred, but the vibration increased slowly. At this time, the bearing kurtosis began to suddenly reach a certain value. We believe that the bearing shows initial failure at this time.
  • First of all, we want to emphasize that it is very important to keep the outer spherical bearing lubricated and clean. So before we inspect the bearing, we should clean the surface of the bearing first, and then disassemble the parts around the bearing. It should be noted that the oil seal is a very fragile part, so extra care should be taken during inspection and disassembly. 
  • Do not apply excessive force to avoid damage to the parts. Then carefully check the oil seal of the bearing and its surrounding parts. If there are bad symptoms, be sure to replace them. The bad oil seal will cause damage to INA Bearing, make the bearing cloud abnormal and cause equipment shutdown.
  • Secondly, we should check the lubricant of the bearing. Lubrication is very important, not only for bearings, but also for all bearings. However, please note that the outer spherical bearing should not be greased too much.
  • Rub between your fingers with a little lubricant. If there are pollutants, you can feel them; Or apply a thin layer of lubricant on the back of the hand, and then perform light sealing inspection.
  • After draining the old engine oil from the bearings lubricated with engine oil, if possible, refill fresh engine oil and let the machine rotate at low speed for several 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 grease lubricated outer spherical bearing, the arbor used should avoid any part of the bearing with cotton joint angle. Because these residual fibers may wedge between the rolling parts and cause damage, especially in the application of small bearings.
  • INA Bearing shows late fault characteristics. The time from the occurrence of serious fault (generally bearing damage, such as shaft holding, burning, sand frame spalling, raceway, bead wear, etc.) is usually less than one week. The larger the equipment capacity, the faster the rotating speed, and the shorter the interval. Therefore, in the actual bearing fault diagnosis, once the late fault features are found, the bearing fault should be determined and the maintenance should be arranged as soon as possible.
  • The reasons for the noise of rolling bearings are complex. One is the wear of the mating surfaces of the inner and outer rings of bearings. Due to this kind of wear, the matching relationship between the bearing and the shell, the bearing and the shaft is damaged, resulting in the axis deviation from the correct position and abnormal noise when the shaft moves at high speed. 
  • When the outer spherical bearing is fatigued, 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 INA 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.
  • During the operation of the mechanism, a certain temperature is allowed at the part where the bearing is installed. When touching the mechanism shell with hands, it is normal to feel that it is not hot. Otherwise, it indicates that the bearing temperature is too high.
  • 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 outer spherical bearing is assembled too tightly; The bearing race rotates on the shaft or in the shell; Excessive load; Broken bearing cage or rolling element, etc.
  • The vibration system composed of stiffness, flexibility, mass, damping, etc. determined by INA Bearing structural design parameters will produce vibration corresponding to its mechanics under operating conditions.