How to reduce the noise of INA Bearing
How to reduce the noise of INA Bearing
2022-05-10
Influence of lubrication on the performance importance of IKO bearing
Influence of lubrication on the performance importance of IKO bearing
2022-05-10

Performance of Koyo bearing material after heat treatment

Use factors mainly refer to whether the installation, Koyo bearing

  • There are many reasons for fag bearing failure. All influencing factors in the design and manufacturing process will be related to bearing failure, which is difficult to judge by analysis. In general, it can be considered and analyzed from two aspects: use factors and internal factors.Koyo bearing
  • Adjustment, use and maintenance, maintenance and repair meet the technical requirements. The installation condition is one of the primary factors in the use factors. The improper installation of the bearing often leads to the change of the stress state between the parts of the whole bearing, and the fag bearing operates in an abnormal state and fails early. Performance of Koyo bearing material after heat treatment
  • 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. In addition, it is also important to analyze and test the quality of grease and the surrounding medium and atmosphere.Performance of Koyo bearing material after heat treatment
  • Internal factors mainly refer to the three factors that determine the quality of fag bearing, such as structural design, manufacturing process and material quality.Performance of Koyo bearing material after heat treatment
  • First of all, a reasonable structural design with progressiveness will lead to a longer bearing life. Fag bearings are generally manufactured through forging, heat treatment, turning, grinding and assembly. The rationality, progressiveness and stability of each processing technology will also affect the service life of the bearing. Performance of Koyo bearing material after heat treatment
  • 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.Performance of Koyo bearing material after heat treatment
  • The metallurgical quality of fag bearing material was once the main factor affecting the early failure of rolling bearing. 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.Koyo bearing
  • The main task of fag 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.Koyo bearing
  • Whether the outer packaging is clear: generally, the brands of the main factory have their own special designers to design the outer packaging, and arrange the factories with qualified production conditions for production. Therefore, the packaging is very clear from line to color block ­ Unambiguous.Koyo bearing
  • Whether the steel seal words are clear: brand words, labels, etc. will be printed on the fag imported bearing body. The font is very small, but most of the products produced by the original factory use steel printing technology, and they are pressed before overheating treatment. Therefore, although the font is small, it is concave ­ Deep, very clear. The font of counterfeit products is not only fuzzy, but also floating on the surface due to the rough printing technology. Some of them can even be easily erased by hand.Performance of Koyo bearing material after heat treatment
  • Whether there is any noise: hold the fag imported bearing body sleeve with your left hand, and turn the sleeve with your right hand to listen for any noise. Due to the backward production conditions of most counterfeit products and complete manual workshop operation, sand will inevitably be mixed in the production process ­ A kind of impurity is hidden in the fag imported bearing body, so it will make a noise when rotating. This is a big difference from the factory brand that strictly implements production standards and operates with machines.Performance of Koyo bearing material after heat treatment
  • Whether there is muddy oil on the surface: this should be paid special attention when purchasing fag imported bearings. As the current domestic antirust technology is not particularly good, it is easy to leave thick oil stains when antirust the imported fag bearing body, and it is sticky when holding it in your hand. However, there is almost no trace of antirust oil on the imported fag bearing, but a particularly careful expert said that the imported fag bearing smells like a smell. It must be antirust oil, but you can’t see it.Performance of Koyo bearing material after heat treatment
  • Whether the chamfer is uniform: the so-called chamfer of fag imported bearing, that is, the junction of horizontal and vertical surfaces. Due to the limitation of production technology, the fake fag imported bearing is not handled satisfactorily in these corners.Performance of Koyo bearing material after heat treatment
Performance of Koyo bearing material after heat treatment

When identifying SKF Bearing

  • Whether the outer packaging is clear: generally, the brands of the main factory have their own special designers to design the outer packaging, and arrange the factories with qualified production conditions for production. Therefore, the packaging is very clear from line to color block – unambiguous.Performance of Koyo bearing material after heat treatment
  • Whether the steel seal words are clear: the SKF Bearing body will be printed with brand words, labels, etc. The font is very small, but most of the products produced by the original factory use steel printing technology, and they are pressed before overheating treatment. Therefore, although the font is small, it is concave – deep and very clear. The font of counterfeit products is not only fuzzy, but also floating on the surface due to the rough printing technology. Some of them can even be easily erased by hand.Performance of Koyo bearing material after heat treatment
  • Whether there is any noise: hold the inner sleeve of SKF Bearing with your left hand, and turn the outer sleeve with your right hand to hear whether there is any noise. Due to the backward production conditions of most counterfeit products and the complete manual workshop operation, it is inevitable that impurities such as sand will be mixed in the production process and hidden in the SKF Bearing, so it will make a noise when rotating. This is a big difference from the factory brand that strictly implements production standards and operates with machines.Performance of Koyo bearing material after heat treatment
  • Whether there is muddy oil on the surface: this should be paid special attention when purchasing SKF bearings. As the current domestic antirust technology is not particularly good, it is easy to leave thick oil traces when antirust the SKF Bearing body, which is viscous when holding it in your hand. Performance of Koyo bearing material after heat treatment
  • However, there is almost no trace of antirust oil on the original SKF Bearing in foreign countries. However, a particularly careful expert said that the SKF Bearing smells like a smell. It must be under antirust oil, but it can’t be seen.Performance of Koyo bearing material after heat treatment
  • Whether the chamfer is uniform: the so-called chamfer of SKF Bearing, that is, the junction of horizontal and vertical surfaces. Due to the limitation of production technology, the fake SKF Bearing is not handled satisfactorily at these corners.Performance of Koyo bearing material after heat treatment

Rolling sound of Koyo bearing

  • During the operation of NTN bearing, the inspection items include rolling sound, vibration, temperature, lubrication status, etc. the specific conditions are as follows:Performance of Koyo bearing material after heat treatment
  • Use a sound detector to check the size and sound quality of the rolling sound of the running bearing. Even if the bearing has slight peeling and other damage, it will produce abnormal sound and irregular sound, which can be distinguished by the sound detector.
  • Vibration of bearing
  • Bearing vibration is very sensitive to bearing damage, such as peeling, indentation, corrosion, crack, wear, etc., which will be reflected in bearing vibration measurement. Therefore, the vibration can be measured by using special bearing vibration measuring instrument (frequency analyzer, etc.), and the specific situation of abnormality can be inferred through frequency analysis.Performance of Koyo bearing material after heat treatment
  •  The measured values are different due to the service conditions of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.Performance of Koyo bearing material after heat treatment
  • Temperature of bearing
  • The temperature of the bearing can be inferred from the temperature outside the bearing chamber. It is more appropriate if the oil hole can be used to directly measure the temperature of the outer ring of the bearing. Usually, the temperature of the bearing rises slowly with the start of operation and reaches a stable state after 1-2 hours. Performance of Koyo bearing material after heat treatment
  • The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the inspection and fault handling, lubrication and installation parts of NTN bearing are appropriate during operation, the 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.Performance of Koyo bearing material after heat treatment
  • When disassembling and inspecting the damaged NTN bearing, the fault and damage cause of the bearing can be judged according to the damage of the bearing.Performance of Koyo bearing material after heat treatment

Size, direction and nature of load: Koyo bearing

  • Ball bearing is suitable for light load, and roller bearing is suitable for heavy load and impact load. When the rolling shaft bears pure axial load, thrust bearing is generally selected; When the rolling shaft bears pure radial load, deep groove ball bearing or short cylindrical roller bearing is generally selected; Performance of Koyo bearing material after heat treatment
  • When the rolling shaft bears pure radial load and small axial load, deep groove ball bearing, angular contact ball bearing, tapered roller bearing, self-aligning ball or self-aligning roller bearing can be selected; When the axial load is large, the angular contact ball bearing and tapered roller bearing with large contact angle can be selected, or the combination of radial bearing and thrust bearing can be selected, which is especially suitable for extremely high axial load or special requirements for large axial rigidity.Performance of Koyo bearing material after heat treatment
  • Allowable speed: it varies greatly due to different types of imported bearings. In general, bearings with low friction and low heat generation are suitable for high speed. The rolling bearing shall be designed to work under the condition of lower than its limit speed.Performance of Koyo bearing material after heat treatment
  • Rigidity: when the bearing bears load, the contact between the bearing ring and the rolling element will produce elastic deformation. The amount of deformation is proportional to the load, and its ratio determines the rigidity of the bearing. Generally, the rigidity of the bearing can be improved through the preloading of the bearing; In addition, in the bearing support design, considering the combination and arrangement of bearings can also improve the support stiffness of bearings.Performance of Koyo bearing material after heat treatment
  • Centering performance and installation error: after the bearing is installed in the working position, it is often installed and positioned poorly due to manufacturing error. At this time, the bearing is often subjected to excessive load due to shaft deflection and thermal expansion, resulting in early damage. Self aligning bearing can overcome the defects caused by installation errors by itself, so it is a bearing suitable for this kind of purpose.
  • Installation and disassembly: tapered roller bearing, needle roller bearing and tapered roller bearing belong to the type of bearing with separable inner and outer rings (i.e. the so-called separated bearing), which is convenient for installation and disassembly.
  • Ina bearing is an international well-known brand bearing with a wide range of uses. Users will inevitably encounter noise from the bearing in the process of use. So how to reduce the noise of INA Bearing? Let’s give you a brief introduction:Performance of Koyo bearing material after heat treatment
  • Adding some chemical additives to the lubricant of INA Bearing by using chemical additives can reduce the bearing noise. For example, a low-noise grease containing noise reduction additives produced by a factory in Tianjin can reduce the bearing noise by 3.9 ~ 9.2db from the original basis, which is suitable for use in micro or small bearings.Performance of Koyo bearing material after heat treatment
  • Good results can be obtained by using vibration absorption or vibration isolation devices to reduce the noise of ina bearings or isolate the noise of bearings, but this often costs a lot in economy. Sometimes, the mechanism becomes larger, the heat dissipation conditions become worse, or it is easy to rust. It should be considered comprehensively in use. This method can be used only after other measures are taken and the low noise index can not be reached. A simple example is the centripetal ball bearing that bears the thrust instead of the thrust bearing at high speed. Performance of Koyo bearing material after heat treatment
  • It can be sleeved with a plastic jacket filled with antirust lubricating oil on its outer ring. The thrust bearing with housing or general thrust bearing can be inlaid with the same plastic sleeve in its inner hole or outer circle if allowed, but the control can not rub or interfere with adjacent parts during rotation. This method has a certain silencing effect. Performance of Koyo bearing material after heat treatment
  • Another example is to add an intermediate sleeve between the bearing and the seat hole, which can attenuate the vibration force transmitted by the rotating system to the bearing seat, but this requires proper allocation, otherwise the opposite effect may occur.Koyo bearingPerformance of Koyo bearing material after heat treatment
  • Another example is the use of sound absorption and sound insulation cover to completely close the bearing system with noise or as close as possible. The inner part of the noise reduction cover is glass fiber or polyurethane foam plastic, and the inner surface is 0.6- LMM thick steel plate, which is uniformly distributed on the surface φ 1.2-1.5mm small through hole, the total area of which accounts for about 25% ~ 30% of the whole inner surface, and the outer surface is 2mm thick steel plate. Here, glass fiber or foam plastic is used to eliminate higher frequency noise, the inner surface with small holes is used to eliminate lower frequency noise, and the thick steel plate on the outer surface is used to isolate the external transmission of noise.Koyo bearing
  • The method of changing the speed of the corresponding part of the main engine ina bearing noise is not very sensitive to the load, but it is very sensitive to the speed. If conditions permit, reduce the speed and increase the torque to achieve the same working purpose, but reduce the noise. Koyo bearing
  • in order to reduce the noise of the oil pump system, the original oil pump with a flow of 10L / min at a motor speed of 1430r / min is changed to a motor with a speed of 710r / min and equipped with a larger oil pump to obtain the same flow. After that, the noise of the oil pump itself, the oil pump bearing and the oil pump motor bearing is significantly reduced, but the space occupied by the whole mechanism is expanded and the cost is increased.Koyo bearing
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