Purpose and principle of preloading NSK imported bearings
Purpose and principle of preloading NSK imported bearings
2022年4月24日
Precautions for the use of ina imported bearings
Precautions for the use of ina imported bearings
2022年4月25日

Method of prolonging the service life of IKO imported bearings

  • The use factors of fag imported bearings mainly refer to whether the installation, adjustment, use and maintenance, maintenance and repair meet the technical requirements. According to the technical requirements for the installation, use, maintenance and repair of fag imported bearings, monitor and inspect the load, speed, working temperature, vibration, noise and lubrication conditions borne by the running bearings. Method of prolonging the service life of IKO imported bearings
  • In case of abnormalities, immediately find out the causes and adjust them to restore them to normal. The installation condition is one of the primary factors in the use factors. The improper installation of fag imported bearings often leads to changes in the stress state between the parts of the whole set of bearings. Fag imported bearings operate in an abnormal state and end their service life early. Method of prolonging the service life of IKO imported bearings
  • The internal factors mainly refer to the three factors that determine the quality of fag imported bearings, such as structural design, manufacturing process and material quality.Method of prolonging the service life of IKO imported bearings
  • In severe cases, metal peeling and large-area random scratches occur on the contact surface; In general, the mechanical damage of Koyo imported bearing refers to the appearance of groove marks at different levels on the alloy surface of bearing bush. Contact surface damage and ablation exist at the same time. The main reason for bearing mechanical damage is that the bearing surface is difficult to form oil film or the oil film is seriously damaged.Method of prolonging the service life of IKO imported bearings
  • To use INA Bearing Grease correctly, you must know the movement of grease in the bearing. Ensure the stability of grease. The movement of the grease filled in the rolling bearing can be roughly divided into two stages with the rotation of INA Bearing.Method of prolonging the service life of IKO imported bearings
  • In general, the filling amount of lubricating grease in INA Bearing always exceeds the actual demand for direct lubrication. It is on the holder and in the cavity of the bearing cover, and forms a contour on the periphery of the rolling element. During this process, the bearing temperature rises rapidly due to the resistance of excess grease. Method of prolonging the service life of IKO imported bearings
  • Although most of the excess grease is squeezed out at the initial stage of operation, and the grease squeezed in the accessories of the raceway may still be brought into the raceway by the rotating rolling element. In the initial stage of the bearing, most of the grease is quickly squeezed out of the raceway (less than one minute), and the accumulated grease is discharged in a small amount while circulating with the rotating body of the bearing. At this time, the Wendu of INA Bearing continues to rise until all the excess bearing grease is discharged, which can be called the running in stage of grease. According to the quality and filling amount of grease in the bearing structure, this period may last for more than ten minutes or even several hours.Method of prolonging the service life of IKO imported bearings
  • Different INA Bearing Greases form different contours in the bearing. It is necessary to form the contour, which is quite draft, the running in time is short, and the ina bearing temperature is low and stable in long-term operation. This is an ideal grease, so it is particularly important for the channelization of the grease.Method of prolonging the service life of IKO imported bearings
  • For the installation of separate INA Bearing, the inner ring and outer ring can be conveniently installed on the shaft or bearing seat respectively At this time, it should be noted that when inserting the shaft with the inner ring into the bearing housing with the outer ring, try to keep it concentric to prevent scratching the rolling element and raceway. When installing a non separating bearing with a tight fit between the inner ring of INA Bearing and the shaft and a loose fit in the bearing seat hole of the outer ring,Method of prolonging the service life of IKO imported bearings
  • When installing the non separable bearing with tight fit between the inner ring and the shaft and loose fit in the bearing seat hole of the outer ring, the ina bearing can be installed on the shaft with a press, and then the shaft together with the ina bearing can be installed into the bearing seat hole. Method of prolonging the service life of IKO imported bearings
  • If the INA Bearing is small, the end face of the ferrule can also be gently hit with a soft metal hammer to force the INA Bearing to, but the knocking force must be evenly distributed on the ina bearing ferrule. When the ina bearing ring is tightly matched with the shaft or ina bearing seat hole, a special installation barrel shall be used to press the INA Bearing onto the shaft or ina bearing seat at the same time.Method of prolonging the service life of IKO imported bearings
  • When the size of ina bearing is large, due to the large installation force required or the large fit interference of bearing under heavy load, it is difficult to adopt cold installation, it is necessary to heat the ina bearing inner ring or bearing seat in advance before installation. During hot installation, the heating temperature shall be strictly controlled. Method of prolonging the service life of IKO imported bearings
  • When heating the bearing, the heating temperature shall not exceed 1200C, generally 80 ~ 1000C. INA Bearing with dust cover or sealing ring cannot be heated, otherwise it will cause lubricant loss. The heating method can be electric induction beauty, oil bath heating and other methods.Method of prolonging the service life of IKO imported bearings
  • Local high temperature is formed, and there is a small convex metal surface in direct contact between the journal and the friction pair of Koyo bearing. In case of lack of lubrication and poor cooling, the bearing alloy will be blackened or partially burned. This fault is often caused by too tight fit between journal and bearing; Lack of lubricating oil pressure is also easy to burn the bearing. As we all know, in addition to the adverse phenomena of the bearing in use, the noise also lies in the bearing itself. Different types of NTN bearings have different noise, so how do we choose the bearing with low noise?Method of prolonging the service life of IKO imported bearings
Method of prolonging the service life of IKO imported bearings
  • Bearings with relatively low noise: when the above two types of low noise bearings cannot be used, bearings with relatively low noise can be used. The specific comparison basis is as follows:
  • The noise of ball bearing is lower than that of roller bearing, and the (friction) noise of bearing with less sliding is lower than that of bearing with more sliding; If there are many balls, the outer ring is thick and the noise is small;
  • The noise of bearings with solid cages is relatively lower than that of bearings with stamping cages;
  • The noise of bearings with plastic cages is lower than that of bearings with the above two cages;Method of prolonging the service life of IKO imported bearings
  • The noise of bearings with high precision, especially those with higher rolling element precision, is relatively lower than that of bearings with low precision;Method of prolonging the service life of IKO imported bearings
  • The noise of small bearings is relatively lower than that of large bearings.Method of prolonging the service life of IKO imported bearings
  • Rolling bearings with low noise requirements include: among the standard bearings produced in China, some single row radial ball bearings and short cylindrical roller bearings have low noise varieties for motor bearings. The inner diameter of ball bearing φ 2.5mm to φ There are several varieties of 60mm with three suffixes of ZL, Z2 and Z3, which correspond to three different low-noise requirements respectively.Method of prolonging the service life of IKO imported bearings
  •  Among the roller bearings, there are eight models from n309 to n322, which are also manufactured according to the low-noise standard. These bearings can be fully applicable to other machines with low noise requirements, and the price is cheap. If the type and size can meet the requirements, try to use these two types of low noise bearings.Method of prolonging the service life of IKO imported bearings
  • There are two kinds of noise caused by problems in bearing application: scar sound and dust sound, which are described as follows:Method of prolonging the service life of IKO imported bearings
  • Scar sound and its control method
  • If there is crack, indentation or corrosion on the rolling surface of rolling bearing, periodic vibration and noise like riveting rivets will occur. Its cycle may be fixed, but most of it has a certain corresponding relationship with the rotating speed. The scars will occur continuously on the channel, and the scars will appear on the steel ball from time to time, and this noise will change with the installation and lubrication conditions.
  • The control methods of this kind of noise are as follows: do not knock the NTN bearing during installation. When the bearing is assembled with the shaft and then installed into the bearing seat, prevent the bearing from being installed obliquely; Prevent NTN bearings from rusting during storage and impact vibration during transportation; Use grease with high viscosity.
  • Dust sound and its control method
  • If there are dust and other foreign matters in the rolling bearing, aperiodic vibration and so-called dust sound will occur. The magnitude of vibration and noise is uncertain, and there may or may not be.
  • The control methods of dust noise include: improving the cleaning method of NTN bearing, and strictly cleaning the NTN bearing, shaft, seat hole and matching parts before installation; Remove foreign matters in the lubricant; Improve the sealing of NTN bearing; Avoid using plastic cages with impure materials or embedded foreign matters.
  • Noise caused by lubrication factors and Its Countermeasures
  • Incorrect lubricant selection, insufficient lubricant or aging hardening can lead to vibration and noise of NTN bearing, and this noise has no certain law. In this case, only select the appropriate lubricant, adjust the amount of lubricant, prolong the service life of lubricant and reasonably determine the replacement cycle.
  • Noise related to main engine and Its Countermeasures
  • This kind of noise is not caused by NTN bearings alone, so it is futile to find the reason only from the bearing. We should pay full attention to the main engine and improve the performance of the main engine if necessary. This paper mainly describes the common buzzer sound and frame resonance sound in the motor.
  • Buzzer of motor and Its Countermeasures
  • The axial vibration of the motor shaft will cause great high-frequency noise – buzzer, and its frequency is the same as the axial vibration frequency, which can be constant or variable. The method to prevent the buzzer is the same as that to prevent the axial vibration.Method of prolonging the service life of IKO imported bearings
  • Resonance sound of NTN bearing frame and Its Countermeasures
  • When the axial natural vibration of NTN inlet bearing frame is caused by the axial natural vibration of the above-mentioned outer ring mass, a noise called resonant sound will be generated. The method of pre tightening can improve the axial natural frequency of the outer ring mass system, destroy the resonance condition and reduce the noise. Proper material selection is still a factor that must be considered in bearing failure analysis. Method of prolonging the service life of IKO imported bearings
  • The main task of NSK bearing failure analysis is to find out the main factors causing bearing failure according to a large number of background materials, analysis data and failure forms, so as to put forward targeted improvement measures, prolong the service life of the bearing and avoid sudden early failure of the bearing. The installation condition is one of the primary factors in the use factors.Method of prolonging the service life of IKO imported bearings
  •  The improper installation of the bearing often leads to the change of the stress state between the parts of the whole bearing, and the NSK bearing operates in an abnormal state and fails early. According to the technical requirements of bearing installation, use, maintenance and repair, monitor and inspect the load, speed, working temperature, vibration, noise and lubrication conditions borne by the running bearing, find out the cause immediately and adjust it to make it return to normal.Method of prolonging the service life of IKO imported bearings
  • First of all, the reasonable design and advanced nature of the structure will lead to longer bearing life. The manufacturing of bearings generally goes through multiple processing processes such as forging, heat treatment, turning, grinding and assembly. The rationality, advanced nature and stability of all the processing technologies will also affect the life of bearings. Method of prolonging the service life of IKO imported bearings
  • Among them, the heat treatment and grinding processes that affect the quality of finished bearings are often more directly related to the failure of bearings. In recent years, the research on the metamorphic layer of the working surface of NSK bearing shows that the grinding process is closely related to the surface quality of the bearing.Method of prolonging the service life of IKO imported bearings

IKO imported bearings

  • Generally, if the 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 called the quality service limit of 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.
  • As for the damage state of NTN bearing, for example, the clamping damage of the ring retaining edge of roller bearing can be considered as the reason. These reasons can also coincide with insufficient lubricant, unsuitable, defects of oil supply and drainage structure, intrusion of foreign matters, bearing installation error and excessive deflection of shaft.
  • Therefore, only investigating the bearing damage, it is difficult to know the real cause of the damage. However, if you know the use machinery, service conditions, the structure around the bearing, the situation before and after the accident, and combined with the damage state of the bearing and several causes, you can prevent the recurrence of similar accidents. The structural design, manufacturing process and material quality of ina imported bearings are analyzed.
  • INA imported bearings have reasonable design and advanced nature, so that long service life of INA bearing will be longer. The manufacturing of bearings generally goes through multiple processing processes such as forging, heat treatment, turning, grinding and assembly. The rationality, advanced nature and stability of all the processing technologies will also affect the life of bearings. 
  • Among them, the heat treatment and grinding processes that affect the quality of finished bearings are often more directly related to the failure of bearings. In recent years, the research on the metamorphic layer on the working surface of bearing shows that the grinding process is closely related to the surface quality of bearing.
  • The metallurgical quality of ina imported bearing materials was once the main factor affecting the early failure of rolling bearings. With the progress of Metallurgical Technology (such as vacuum degassing of bearing steel), the quality of raw materials has been improved. The proportion of raw material quality factor in bearing failure analysis has decreased significantly, but it is still one of the main influencing factors of bearing failure. Proper material selection is still a factor that must be considered in bearing failure analysis.
  • The main task of ina imported bearing failure analysis is to find out the main factors causing bearing failure according to a large number of background materials, analysis data and failure forms, so as to put forward targeted improvement measures, prolong the service life of the bearing and avoid sudden early failure of the bearing. For the use of bearings, noise is very common. Even the low-noise bearings in the imported Koyo bearings have the same situation. So why does it make noise? Today I will introduce its essence to you.
  • The raceway sound of Koyo imported bearing and its control method raceway sound is a smooth and continuous sound generated by the rolling body rolling on the raceway surface when Koyo imported bearing is running. It is a unique basic sound that will occur in all rolling bearings. 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 total sound pressure level increases with the speed. For the bearing with loud raceway sound, the sound pressure level of raceway sound decreases with the increase of viscosity; For bearings with low raceway noise, the sound pressure level changes from decrease to increase when the viscosity increases to more than 20mm2 / s. The greater the rigidity of the bearing pedestal, the lower the total sound pressure level of the raceway sound. If the radial clearance is too small, the total sound pressure level and dominant frequency of raceway sound will increase sharply with the decrease of radial clearance.