The main cause of INA Bearing burns is due to the poor lubrication of INA Bearing
The main cause of INA Bearing burns is due to the poor lubrication of INA Bearing
2022年5月13日
Fault inspection of NSK bearing in operation
Fault inspection of NSK bearings operation
2022年5月13日

Causes of nine common faults of INA Bearing

With the progress and development of faults of INA Bearing

  •  mechanization has been widely used in production and life. 
  • As an indispensable part of machinery, NTN bearing will be used more and more widely, because NTN bearing will be used wherever there is rotation.Causes of nine common faults of INA Bearing
  • NTN bearing is mainly used to support and reduce friction in machinery, so the accuracy and noise of NTN bearing are directly related to the service life of machinery.
  • NTN bearing models are generally selected by users’ technicians according to the service conditions and load of supporting products. If the NTN bearing fails to meet the use requirements, it should be recommended to re select the model as soon as possible, but unless special products, there will generally be no problem in selecting the model.
  • NTN bearing is a high-precision product. If it is not assembled properly, it is easy to damage the NTN bearing channel, resulting in the damage of NTN bearing. NTN bearing shall be equipped with a special mold during assembly, which can not be knocked at will. When pressing the shaft, only a small ring can be stressed, and when pressing a large ring, only a large ring can be stressed. 
  • Pneumatic or hydraulic pressure is required during assembly. During press assembly, the upper and lower molds shall be outside the horizontal state. If there is inclination, the NTN bearing channel will be damaged due to stress and the NTN bearing will produce conduction sound.
  • The service life of NTN bearing is closely related to manufacturing, assembly and use. It must be done well in each link in order to make NTN bearing in the running state, so as to prolong the service life of NTN bearing. High speed motorized spindle is the core component of high-speed machine tool. The accuracy of each part of motorized spindle unit is usually μ Class m, if runout is generally 1 ~ 3 μ m. 
  • The spindle stiffness is generally 100-300n/ μ m. Therefore, the precision error and deformation of each part of the motorized spindle are very small. However, when running at high speed, NTN bearing generates a lot of heat, resulting in high temperature rise of NTN bearing and thermal deformation. The error caused by thermal deformation is much larger than the accuracy error and deformation. Causes of nine common faults of INA Bearing
  • Moreover, the thermal deformation directly changes the preload condition of NTN bearing, affects the stiffness characteristics of NTN bearing and the machining accuracy of motorized spindle, and even leads to the thermal bite of NTN bearing and the destruction of motorized spindle. The heating problem of motorized spindle reduces its reliability in practical production and application. Causes of nine common faults of INA Bearing
  • Therefore, thermal analysis of NTN bearing and mastering the thermal characteristics of NTN bearing are extremely important to improve the stability and reliability of motorized spindle machining. High speed precision angular contact ball NTN bearing is a kind of NTN bearing widely used in machine tool spindle unit.  Causes of nine common faults of INA Bearing
  • Taking this kind of NTN bearing as the research object, this paper makes a meaningful thermal characteristic analysis and calculation of high-speed precision spindle NTN bearing system. It is common for ina bearing to fail during operation, so there is no need to make a fuss. In case of failure, judgment and treatment are the key. Causes of nine common faults of INA Bearing
  • Ina bearing temperature is too high: when the mechanism is running, the part where ina bearing is installed is allowed to have a certain temperature. When touching the mechanism shell with hands, it is normal not to feel hot. Otherwise, it indicates that the ina bearing temperature is too high.Causes of nine common faults of INA Bearing
  • The reasons for the high temperature of INA Bearing are: 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); Ina bearing assembly is too tight; Causes of nine common faults of INA Bearing
  • INA Bearing Race rotates on the shaft or in the shell; Excessive load; Breakage of ina bearing cage or rolling element, etc.Causes of nine common faults of INA Bearing
  • INA Bearing Noise: 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 ina bearing is faulty. The causes of noise produced by rolling ina bearing are relatively complex. 1) it is the wear of the mating surfaces of the inner and outer rings of INA Bearing. Causes of nine common faults of INA Bearing
  • Due to this kind of wear, the matching relationship between INA Bearing and shell, INA Bearing and shaft is damaged, resulting in the axis deviation from the correct position and abnormal noise when the shaft moves at high speed. When ina bearing is tired, its surface metal will peel off, which will also increase the radial clearance of INA Bearing and produce abnormal sound. Causes of nine common faults of INA Bearing
  •  The bearing will be broken due to insufficient lubrication and abnormal ina. 3) After the ina bearing is worn and loose, the cage is loose and damaged, which will also produce abnormal noise and damage to the INA Bearing. During the disassembly and inspection of rolling INA Bearing.Causes of nine common faults of INA Bearing
  • the fault and damage cause of ina bearing can be judged according to the damage of INA Bearing.Causes of nine common faults of INA Bearing
  • Metal spalling on the raceway surface: the rolling element of INA Bearing and the raceway surfaces of inner and outer rings are subjected to periodic pulsating load, resulting in periodic contact stress. When the number of stress cycles reaches a certain value, fatigue spalling will occur on the working surface of rolling element or inner and outer race raceway. Causes of nine common faults of INA Bearing
  • If the load of ina bearing is too large, this fatigue will be exacerbated. In addition, improper installation of INA Bearing and shaft bending will also produce raceway spalling. The fatigue spalling of INA Bearing Raceway will reduce the operating accuracy of the shaft and cause vibration and noise of the mechanism.Causes of nine common faults of INA Bearing
  • INA Bearing burn: the burned ina bearing has a return fire color on its raceway and rolling element. The causes of burns are generally insufficient lubrication, unqualified or deteriorated lubricating oil quality, and tight assembly of ina bearings.
  • Plastic deformation: uneven pits appear on the contact surface between the raceway and the roller of INA Bearing, indicating that ina bearing has plastic deformation. The reason is that under the action of large static load or impact load, the local stress on the working surface of INA Bearing exceeds the yield limit of the material, which generally occurs on ina bearing rotating at low speed.Causes of nine common faults of INA Bearing
  • INA Bearing Race crack: the reason for the crack of ina bearing race may be that the INA Bearing fits too tightly, the foreign or inner ring of ina bearing is loose, the inclusion part of ina bearing is deformed, the surface processing of ina bearing is poor, etc.Causes of nine common faults of INA Bearing
  • Broken cage: the reason is insufficient lubrication, broken rolling element, seat ring skew, etc.Causes of nine common faults of INA Bearing
  • The metal of the cage adheres to the rolling element, which may be due to the rolling element being stuck in the cage or insufficient lubrication.Causes of nine common faults of INA Bearing
  • Serious wear of race raceway: foreign matters may fall into the race, insufficient lubricating oil or inappropriate lubricating oil brand. The first is to identify and check the rolling sound of Timken bearing
  • We can use sound detector to check the rolling sound and sound quality of Timken bearing in operation. Because Timken bearing will emit abnormal sound and irregular sound even if there is slight peeling and other damage, it can be distinguished by sound detector to prevent it in advance. INA Bearing

Secondly, the vibration of INA Bearing in operation is identified and checked

  • Timken bearing vibration is very sensitive to the damage of Timken bearing. For example, peeling, indentation, corrosion, crack, wear, etc. will be reflected in the vibration measurement of Timken bearing. Causes of nine common faults of INA Bearing
  • Therefore, the vibration can be measured by using a special Japanese Timken bearing vibration meter (frequency analyzer, etc.), and the specific situation of abnormality can not be inferred through frequency division. Causes of nine common faults of INA Bearing
  • The measured values are different due to the service conditions of Timken bearing or the installation position of sensor, so it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.Causes of nine common faults of INA Bearing
  • After that, check according to the temperature of Timken bearing
  • The temperature of Timken bearing can generally be inferred from the temperature outside the Timken bearing chamber in Japan. It is more appropriate if the outer ring temperature of Timken bearing can be directly measured by oil hole. Causes of nine common faults of INA Bearing
  • Usually, the temperature of Timken bearing rises slowly with the start of operation 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.  Causes of nine common faults of INA Bearing
  • If the lubrication and installation parts are appropriate, the Timken 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. Causes of nine common faults of INA Bearing
  • According to a large number of test data, since the temperature is affected by lubrication, speed, load and environment, the value in the table only represents the approximate temperature range. Using the thermal sensor, the working temperature of Timken bearing can be monitored at any time, and the automatic alarm or stop when the temperature exceeds the specified value can be realized to prevent the occurrence of combustion shaft accident. INA Bearing 
Causes of nine common faults of INA Bearing

Special positioning faults of INA Bearing

  • In order to improve the actual fitting accuracy of NTN bearing during installation, it is necessary to accurately measure the fitting surface dimensions of the inner hole and outer circle of NTN bearing by using the measurement methods and tools that do not deform the NTN bearing. Causes of nine common faults of INA Bearing
  • All the measurement items related to the inner diameter and outer diameter can be measured, and the measured data can be comprehensively analyzed. Based on this, the dimensions of the installation parts of Japanese NTN bearing that accurately match the shaft and seat hole can be measured. Causes of nine common faults of INA Bearing
  • When actually measuring the corresponding size and geometry of the matched shaft and seat hole, it shall be carried out under the same temperature conditions as when measuring NTN bearing.Causes of nine common faults of INA Bearing
  • In order to ensure a high actual matching effect, the roughness of the surface of the shaft and seat hole matched with the NTN bearing shall be as small as possible.Causes of nine common faults of INA Bearing
  • During the above measurement, two groups of marks indicating the direction of large deviation shall be made on the outer circle and inner hole of NTN bearing and the corresponding surface of shaft and seat hole on both sides close to the assembly chamfer, so as to align the large deviation of matching two sides with the same direction during actual assembly, so that the deviation of both sides can be partially offset after assembly.Causes of nine common faults of INA Bearing
  • The purpose of making two groups of orientation marks is to comprehensively consider the compensation of deviation, not only improve the rotation accuracy of the supports at both ends, but also partially eliminate the coaxiality error of the seat hole between the two supports and the journal at both ends.Causes of nine common faults of INA Bearing
  •  The implementation of surface strengthening measures on the mating surface, such as sand blasting, using a precision plug with a slightly larger diameter to plug the primary inner hole, etc., are conducive to improving the mating accuracy. Causes of nine common faults of INA Bearing
  •  Focusing on the development of sea and land oil and natural gas, the demand for oil refining, ethylene and three major synthetic materials (synthetic resin, synthetic rubber and synthetic fiber) of INA Bearing will increase at a growth rate of 6% to 9%.Causes of nine common faults of INA Bearing
  •  This requires a large number of oil and gas pipeline gathering and transportation equipment and large-scale and efficient petrochemical equipment, focusing on the development of large-scale desert and marine oil exploration and drilling and production equipment, and large-scale complete sets of equipment with an annual output of more than 600000 tons of ethylene, tons of urea and chemical fiber. Causes of nine common faults of INA Bearing
  • Therefore, the annual market demand of ina bearings, mechanical seals and packing static seals for petrochemical equipment supporting and maintenance will increase greatly.
  • INA Bearing has developed a series of high temperature resistant sealed self-aligning roller ina bearings suitable for harsh environments. This Japanese ina bearing is characterized by rubber seals on both sides to ensure that the Japanese INA Bearing Raceway operates in a dust-free environment and prevent grease leakage. 
  • It has the advantages of dust-proof, waterproof, high temperature and high pressure resistance, heavy load and other advantages. It also has open type and high temperature resistant ina bearings suitable for specific applications, It can operate continuously under the working condition of – 40 to + 350 degrees, which is the attractive feature of INA Bearing and can not be replaced in many demanding applications. 
  • When the fag bearing inner ring is installed on the shaft, the position of the fag bearing is generally fixed on one side by the shaft shoulder, and the other side is fixed with nuts, stop washers or spring retaining rings.
  •  The size of the contact part between the shaft shoulder and axial fixed parts and the fag bearing inner ring can be determined according to the installation size of various fag bearings listed in the fag bearing size table.
  • In some special cases, when the shoulder and fillet dimensions of the shaft cannot be determined according to the installation dimensions listed in this catalog, the transition gasket can be used as the axial support.

Spring retainer positioning faults of INA Bearing

  • When fag bearing bears little axial load, the rotating speed is not high, the shaft is short and it is difficult to process threads on the journal, the elastic retaining ring with rectangular section can be used for positioning. This method has the advantages of convenient loading and unloading, small position and simple manufacture.
  • Thrust washer positioning
  • When the journal is short, it is difficult to process the thread on the journal, and the fag bearing has high speed and large axial load, the washer can be used for positioning, that is, the washer can be used for positioning with more than two screws on the end face of the shaft, and the lock washer or iron wire can be screwed to prevent loosening.
  • Positioning of tightening sleeve
  • Fag bearing is a self-aligning roller bearing with low rotating speed and bearing stable radial load and small axial load. Fag bearing can be installed on the optical shaft with the help of conical tightening sleeve. The locking sleeve is positioned with a nut and a tab washer. Use the friction force of the nut locking sleeve to position the fag bearing.

 INA Bearing positioning with tapered bore

  • Fag bearing with tapered inner hole is installed on the tapered shaft. It is necessary to tighten the shaft and fag bearing with axial load. Therefore, pay attention to the directionality of inner hole taper during installation. If fag bearing is located at the shaft end and is allowed to be processed into thread at the shaft end, it can be directly positioned with nut.
  • If the Japanese fag bearing is not installed on the shaft end, and the shaft is not allowed to be processed into thread. In this case, the two halves of the combined threaded ring can be clamped into the groove of the shaft, and then the nut is used to locate the fag bearing.
  • Nut positioning
  • Under the condition of high rotating speed and large axial load of fag bearing, the end face of the nut in contact with the inner ring of fag bearing shall be perpendicular to the rotation center line of the shaft. 
  • Otherwise, even tightening the nut will damage the installation position of fag bearing and the normal working state of fag bearing, and reduce the rotation accuracy and service life of fag bearing. Especially when the fit between fag bearing inner hole and shaft is loose, it needs to be strictly controlled.
  • In order to prevent the nut from loosening during rotation, appropriate technical measures to prevent loosening need to be taken. 
  • Use the nut and lock washer for positioning, put the key teeth in the lock washer into the keyway of the shaft, and then bend one of the teeth on the outer ring into the notch of the nut.
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