The common problems and Countermeasures of loading failure of imported rotary table bearing are analyzed
The common problems and Countermeasures of loading failure of imported rotary table bearing are analyzed
2022-04-13
Methods for noise inspection and maintenance of one-way bearing
Methods for noise inspection and maintenance of one-way bearing
2022-04-13

Effect of Timken imported bearing quality on temperature and vibration

  1. Obvious loose defects are not allowed on the finished ina bearing ring. It will reduce the density of ferrule and enrich more micropores, low melting point impurities, gases and non-metallic inclusions Like the ribbon carbide, it plays the role of dividing the continuity of the matrix, causing component segregation and matrix embrittlement, which greatly reduces the comprehensive mechanical properties of the ferrule.Effect of Timken imported bearing quality on temperature and vibration.Effect of Timken imported bearing quality on temperature and vibration
  2. The black-and-white concentration difference of martensite matrix in quenching and tempering state, high macro hardness value and loose defects are also potential factors that can not be ignored to induce grinding cracks. 
  3. The appearance of black-and-white concentration difference indicates that there are serious banded carbides in the original structure, resulting in the segregation of carbon lattice concentration on and between bands. Therefore, after quenching, the overheating tendency between bands and the difference of MS point are increased.Effect of Timken imported bearing quality on temperature and vibration
  4. The influence of grinding quality on the premature failure of ina bearing can be judged from the above test results. The grinding crack and grinding burn on one side of the raceway are a direct cause of the collapse of the ferrule and the premature failure of the bearing. Effect of Timken imported bearing quality on temperature and vibration
  5. The macro morphology of the crack and the distribution characteristics of grinding burn revealed in this example show that the original position of the raceway is too deviated or the R of the raceway is not round, which increases the grinding allowance on one side of the raceway.Effect of Timken imported bearing quality on temperature and vibration 
  6. When the feed rate is large in the coarse grinding stage When the grinding speed is fast, the whole raceway produces uneven grinding. If the grinding wheel is not trimmed in time, it will promote the embedding or adhesion of grinding debris, resulting in the blockage and passivation of the grinding wheel pores, which will increase the imbalance of the grinding wheel, aggravate the spindle vibration, and even the grinding chatter caused by the vibration of the machine tool. Obviously, the grinding force changes periodically, forming intermittent burn strips.
  7. In order to further understand the hardness distribution of ferrule and the microstructure characteristics of quenching and tempering microstructure and surface layer, the partially cracked inner ring and its fragments are selected, the macro hardness is set on the end face, and the longitudinal metallographic samples are intercepted near the crack by wire cutting method.Effect of Timken imported bearing quality on temperature and vibration
  8. In the working process of INA Bearing, due to the influence of external or internal factors, the original matching clearance is changed, the accuracy is reduced, and even “bite” is called clearance change failure. External factors such as excessive interference, improper installation, expansion caused by temperature rise, instantaneous overload, etc., and internal factors such as residual austenite and residual stress in an unstable state are the main reasons for the change and failure of clearance.Effect of Timken imported bearing quality on temperature and vibration
  9. If the bearing is well lubricated and properly blocks sundries and moisture, it means that the oil seal should not be worn However, when opening the bearing housing, check the bearing and regularly check the oil seal Check the condition of oil seals near the bearing to ensure that they are sufficient to prevent hot liquid or corrosive liquid or gas from penetrating into the bearing along the axis. If the oil seal is worn, replace it as soon as possible
  10. High temperature often indicates that ina bearing is in abnormal condition High temperatures are also harmful to lubricants in bearings Sometimes bearing overheating can be attributed to the lubricant of the bearing If the bearing operates for a long time at a temperature of more than 125 ℃, the service life of the bearing will be reduced
  11. The causes of high-temperature bearing include insufficient or excessive lubrication, magazine contained in lubricant, excessive load, bearing damage, insufficient clearance, high-temperature friction caused by oil seal, etc
  12. Check the condition of the running machine and monitor it to avoid equipment shutdown
  13. Human sweat is a colorless, transparent or light yellow liquid with salty taste and weak acid. Its pH value is 5 ~ 6. In addition to sodium, potassium, calcium and magnesium salts, it also contains a small amount of organic acids such as urea, lactic acid and citric acid. When sweat comes into contact with metal, a layer of sweat film will be formed on the metal surface, which will cause electrochemical effect on metal and corrode metal
  14. Under some special service conditions, adding a small amount of solid lubricant to the grease, such as adding 3 ~ 5% molybdenum disulfide 1, can reduce wear and improve the compression and heat resistance. For special conditions such as high temperature, elegance, high vacuum, corrosion resistance, radiation resistance and extremely low temperature, adding solid lubricant to engineering plastics or powder metallurgy materials can make Koyo bearing parts with self-lubricating performance. For example, bonding solid lubricant to raceway A lubricating film is formed on the cage and the rolling element, which has a certain effect on reducing friction and wear
  15. Viscosity is an important characteristic of lubricating oil. The viscosity directly affects the fluidity of lubricating oil and the thickness of oil film formed between friction surfaces. The viscosity of lubricating oil under the working temperature of Koyo bearing is generally 12-15cst. The higher the speed of bearing, the lower the viscosity should be selected, and the heavier the load, the higher the viscosity should be selected. The commonly used lubricating oils include mechanical oil, high-speed mechanical oil, steam turbine oil, compressor oil, transformer oil, cylinder oil, etc
  16. Oil dripping lubrication is suitable for bearing components requiring quantitative supply of lubricating oil. The amount of oil dripping is generally one drop every 3-8 seconds. Excessive amount of oil will increase the bearing temperature
  17. The filtered oil is delivered to the Koyo bearing parts by the oil pump. The lubricating oil after the bearing is filtered and cooled before use. Since the circulating oil can take away some heat and cool the bearing, this method is applicable to the bearing parts with high speed
  18. The dry compressed air is mixed with the lubricating oil through the spray to form an oil mist. The jet bearings can effectively cool the bearing and prevent impurities from entering. This method is suitable for lubrication of high-speed and high temperature bearing parts.Effect of Timken imported bearing quality on temperature and vibration
  19. Use the oil pump to shoot the high-pressure oil into the bearing through the nozzle, and the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at high speed, the rolling element and cage also form air flow around at a fairly high rotation speed. It is difficult to send the lubricating oil to the bearing by general lubrication method. At this time, the lubricating oil must be sprayed into the bearing by high-pressure injection method, and the position of the nozzle should be placed between the inner ring and the center of the cage
  20. The installation of the bearing shall be determined according to the bearing structure, size and the matching nature of Koyo bearing components. The pressure shall be directly added to the end face of the tightly matched ferrule, and the pressure shall not be transmitted through the rolling element. The bearing installation generally adopts the following methods:Effect of Timken imported bearing quality on temperature and vibration
  21. Keep the bearing and its surroundings clean.Effect of Timken imported bearing quality on temperature and vibration
  22. Even small dust that cannot be seen by the eyes will have a bad impact on the bearing. Therefore, keep the surrounding clean so that the dust will not invade the bearing.
  23. Use with care.Effect of Timken imported bearing quality on temperature and vibration
  24. Strong impact on the bearing during use will produce scars and indentations, which will become the cause of the accident. In serious cases, it will crack and fracture, so we must pay attention to it.Effect of Timken imported bearing quality on temperature and vibration
  25. Use appropriate operating tools.Effect of Timken imported bearing quality on temperature and vibration
  26. Avoid replacing with existing tools, and appropriate tools must be used.Effect of Timken imported bearing quality on temperature and vibration
  27. Pay attention to the corrosion of the bearing.Effect of Timken imported bearing quality on temperature and vibration
  28. When operating Koyo bearings, sweat on your hands can be the cause of rust. Pay attention to operate with clean hands and try to wear gloves.Effect of Timken imported bearing quality on temperature and vibration
  29. In general, Timken imported bearings of Zhengchang brand have their own special designers to design the external packaging, and arrange factories with qualified production conditions for production. Therefore, the packaging is very clear and unambiguous from lines to color blocks. There are unique designs specially designed to protect their own intellectual property rights on the accessories packaging of some brands.
Effect of Timken imported bearing quality on temperature and vibration

Effect of Timken imported bearing quality on temperature and vibration

  • Main purpose of preloading: the main purpose of preloading can be proved by some representative examples:
  • In the correct direction and radial position, the axial direction determines the shaft and suppresses the runout of the shaft.
  • Increase the rigidity of the bearing. Machine tool spindle bearing, bicycle and small agent bearing, gear differential.
  • To prevent the axial direction of vibration and resonance of different sounds. Small motor bearings.
  • Suppress scrolling, rotating, sliding, and rotating revolutionary slides. High speed rotating center thrust bearing, thrust ball bearing.
  • Ring and keep rolling in the correct position. Thrust ball bearing, thrust spherical roller bearing, and horizontal shaft.
  • Preloading method: the pre positioning of load is the preloading method that the relative position of Koyo imported bearing shaft will not change in use. Here is an example:
  • In order to implement the difference before the adjustment of the width between preloads or the fastening method after the axial clearance of bearings.
  • Adjust the size of the pad, gasket and bearing preload to make way.
  • The method adopted after tightening the screw and nut clearance with adjustable shaft direction. In this case, adjust the friction torque on the hand side with an appropriate preload to determine the start.
  • The so-called constant pressure preload is the use of coil springs and Belleville springs to give the load-bearing of appropriate preparation methods. When in use, even if the relative position of the Koyo inlet bearing changes, the preloading method. When in use, it will even change its relative position, and the preload can be maintained at a certain level.
  • After draining the old engine oil, if possible, the bearings lubricated with engine oil should be filled with fresh engine oil and let the machine rotate at low speed for a few 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 bearing lubricated with grease, the Joe remover used shall avoid the contact of cotton with any part of the bearing. Because these residual fibers may wedge between rolling parts and cause damage, especially in the application of small bearings.
  • When inspecting Koyo imported bearings, never expose the bearings to pollutants or moisture. If the work is interrupted, the machine shall be covered with oil paper, plastic sheet or similar materials.
  • 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.
  • 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.
  • Surface strain: cutting abrasive particles are found in the Ferrograph, and the abrasive particles are composed of non-ferrous metals.
  • 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.
  • Under the condition of liquid lubrication, the sliding surface is separated by lubricating oil without direct contact, which can also greatly reduce the friction loss and surface wear, and the oil film also has a certain vibration absorption ability
  • Oyo bearing faults are often due to a variety of factors, the influence of all design and manufacturing process factors and bearing faults, and their analysis is not easy to determine. Under normal circumstances, in general, you can consider and analyze factors and internal factors.
  • The main factors used for adjustment are installation, use and maintenance, maintenance and repair, which meet the technical requirements. The installation condition is one of the factors for using Koyo bearings. It is the primary factor of the load-bearing force that often causes the state change between various parts of the incorrect installation package, and the operation in abnormal state and early failure.Effect of Timken imported bearing quality on temperature and vibration
  •  Monitor and inspect the contact load, speed, temperature, vibration, noise and lubrication status of the operating bearing according to the technical requirements of bearing installation, use, maintenance and maintenance. If any abnormality is found, find the cause immediately and adjust it back to normal. In addition, the quality of oil and surrounding media and atmosphere are also very important for analysis and testing.Effect of Timken imported bearing quality on temperature and vibration
  • The chamfer of the bearing does not determine the quality of the bearing, but reflects the processing method of the bearing. The chamfering is black, which means that after quenching and other heat treatment, the hardness of the bearing can be improved. Some people think that the chamfering is black, which is not good-looking and is not completely processed. This is a misunderstanding.Effect of Timken imported bearing quality on temperature and vibration
  • The integrated cage is better than the two bodies. Although the new technology uses the integrated cage, it only saves materials, and its performance on rotation is worse than that of the two bodies. The chamfering of Koyo bearings does not determine the quality of the bearings. Some people think that the chamfering is black and unsightly because it is not completely processed. This is a misunderstanding.
  • Internal factors mainly refer to structural design, manufacturing process and materials. There are three factors that determine the quality of bearings.Effect of Timken imported bearing quality on temperature and vibration
  • First of all, the structural design and advanced at the same time, there will be a longer Koyo bearing life. Bearing manufacturing will go through multiple processes of forging, heat treatment, turning, grinding and assembly. The rationality, advanced nature and stability of the treatment will also affect the service life of the bearing. The influence of bearing heat treatment and grinding process is often more directly related to bearing failure, which is related to product quality. In recent years, the deterioration of bearing surface layer shows that the grinding process is closely related to the bearing surface quality.
  • The metallurgical quality of bearing materials is the main factor affecting the early failure of rolling bearings. With the progress of Metallurgical Technology (such as bearing steel, vacuum degassing, etc.), the quality of raw materials has been improved. The proportion of raw material quality factor in bearing fault analysis has decreased significantly, but it is still one of the main factors of Koyo bearing failure. Whether the selection is appropriate or not is still a bearing fault analysis that must be considered.
  • Koyo bearing faults are often due to a variety of factors, all the design and manufacturing process factors and bearing faults, their analysis is not easy to determine. Under normal circumstances, in general, you can consider and analyze factors and internal factors.Effect of Timken imported bearing quality on temperature and vibration
  • The main factors used for adjustment are installation, use and maintenance, maintenance and repair, which meet the technical requirements. The installation condition is one of the factors for using Koyo bearings. It is the primary factor of the load-bearing force that often causes the state change between various parts of the incorrect installation package, and the operation in abnormal state and early failure. 
  • Monitor and inspect the contact load, speed, temperature, vibration, noise and lubrication status of the operating bearing according to the technical requirements of bearing installation, use, maintenance and maintenance. If any abnormality is found, find the cause immediately and adjust it back to normal. In addition, the quality of oil and surrounding media and atmosphere are also very important for analysis and testing.Effect of Timken imported bearing quality on temperature and vibration
  • The chamfer of the bearing does not determine the quality of the bearing, but reflects the processing method of the bearing. The chamfering is black, which means that after quenching and other heat treatment, the hardness of the bearing can be improved. Some people think that the chamfering is black, which is not good-looking and is not completely processed. This is a misunderstanding.Effect of Timken imported bearing quality on temperature and vibration
  • The integrated cage is better than the two bodies. Although the new technology uses the integrated cage, it only saves materials, and its performance on rotation is worse than that of the two bodies. The chamfering of Koyo bearings does not determine the quality of the bearings. Some people think that the chamfering is black and unsightly because it is not completely processed. This is a misunderstanding.Effect of Timken imported bearing quality on temperature and vibration
  • Internal factors mainly refer to structural design, manufacturing process and materials. There are three factors that determine the quality of bearings.Effect of Timken imported bearing quality on temperature and vibration
  • First of all, the structural design and advanced at the same time, there will be a longer Koyo bearing life. Bearing manufacturing will go through multiple processes of forging, heat treatment, turning, grinding and assembly. The rationality, advanced nature and stability of the treatment will also affect the service life of the bearing. Effect of Timken imported bearing quality on temperature and vibration
  • The influence of bearing heat treatment and grinding process is often more directly related to bearing failure, which is related to product quality. In recent years, the deterioration of bearing surface layer shows that the grinding process is closely related to the bearing surface quality.Effect of Timken imported bearing quality on temperature and vibration
  • The metallurgical quality of bearing materials is the main factor affecting the early failure of rolling bearings. With the progress of Metallurgical Technology (such as bearing steel, vacuum degassing, etc.), the quality of raw materials has been improved. Effect of Timken imported bearing quality on temperature and vibration
  • The proportion of raw material quality factor in bearing fault analysis has decreased significantly, but it is still one of the main factors of Koyo bearing failure. Whether the selection is appropriate or not is still a bearing fault analysis that must be considered.Effect of Timken imported bearing quality on temperature and vibration.
  • Brand words and labels will be printed on the 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 deeply concave 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.Effect of Timken imported bearing quality on temperature and vibration
  • Hold the bearing body sleeve of the bearing with your left hand and rotate the sleeve with your right hand to listen for any noise. Due to the backward production conditions of most counterfeit products and the complete manual workshop operation, impurities such as sand will inevitably be mixed in the production process and hidden in the Timken imported 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.Effect of Timken imported bearing quality on temperature and vibration
  • This should be paid special attention when purchasing bearings. Since the current domestic antirust technology is not particularly good, it is easy to leave thick oil traces when antirust the bearing body, and it is sticky when holding it in your hand. However, there is almost no trace of antirust oil on the foreign original bearing. However, a particularly careful expert said that the bearing smells like a smell. It must be under antirust oil, but it can’t be seen.Effect of Timken imported bearing quality on temperature and vibration
  • The so-called chamfer of Timken imported bearing is the junction of horizontal and vertical surfaces. Due to the limitation of production technology, the fake bearing is not handled satisfactorily in these corners.
  • Vibration is very sensitive to bearing damage. Peeling, indentation, corrosion, crack and wear will be reflected in bearing vibration measurement. Therefore, the magnitude of vibration can be measured by using a special bearing vibration meter (frequency analyzer, etc.), and the specific situation of abnormality can not be inferred through frequency division. Effect of Timken imported bearing quality on temperature and vibration
  • 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.Effect of Timken imported bearing quality on temperature and vibration
  • Next, let’s look at the effect of temperature on the bearing.Effect of Timken imported bearing quality on temperature and vibration
  • High temperature often indicates that the bearing is in an abnormal condition. High temperature is also harmful to the lubricant of Timken imported bearings. Sometimes bearing overheating can be attributed to the lubricant of the bearing. 
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