Rolling bearings use a variety of mechanical equipment, Timken bearings are required by the increasingly stringent market conditions, equipment and other properties, and the performance is also increasingly diversified. In order to select suitable bearings from a large number of structures and sizes, different angles are required.
Influence analysis of noise caused by limit speed of imported bearing
In the selection of bearings, it is generally believed that as a bearing, the difficulty arrangement of installation and removal, bearing, size and bearing market, etc. space allows, the bearing structure is generally determined. The design life of various machines and various durable bearings limit the comparative study of bearings, and determine the bearing size at the same time. In choosing bearings, bearings tend to think that the grease life, fatigue life, wear resistance and low noise also need to be fully studied.Influence analysis of noise caused by limit speed of imported bearing
In addition, according to different uses, it is necessary to select specially designed bearings with requirements on accuracy, clearance, cage structure, grease and so on. However, there is no certain order and rules for the selection of Timken bearings. Priority should be given to the conditions, performance and related matters required by the bearings, especially practical. Influence analysis of noise caused by limit speed of imported bearing
As long as the bearings in order to maintain the original performance as intact as possible, they should be maintained and maintained in the first place, so as to prevent accidents, ensure the reliability of operation, improve productivity and economy. Corresponding mechanical operation and maintenance operation standards, regular operation and maintenance conditions. This includes monitoring the operation status, replenishing or changing lubricants, and regular inspection and removal. As a problem of maintenance operation, bearing rotation sound, vibration, temperature, lubrication conditions, etc.
Bearing cleaning: remove the bearing for repair, record the appearance of the bearing for the first time, confirm the remaining amount of lubricant, and clean the bearing with the lubricant used after sampling inspection. As a cleaning agent, gasoline and kerosene are generally used. Remove the bearing for cleaning, cleaning and fine washing, and place it in the container.Influence analysis of noise caused by limit speed of imported bearing
Put the metal mesh bottom of the container so that it does not directly contact the dirt of the bearing. Rough washing, if the bearing rotates dirt and damages the bearing rolling surface, attention should be paid to it. In crude oil cleaning, brush with a brush to remove grease, viscous materials, general cleaning and washing into a fine. Fine washing is to wash the oil carefully while rotating the bearing on one side. In addition, the cleaning oil must be kept clean
Maintenance and judgment of Timken bearing: determine whether it can be used to check the bearing after cleaning and remove the bearing. Check the raceway, raceway, surface condition, cage wear, bearing clearance and improvement of dimensional accuracy, irrelevant damage and abnormality. Non separable small ball bearing, inner ring, support level with one hand, rotate the outer ring to confirm smooth. Influence analysis of noise caused by limit speed of imported bearing
Tapered roller bearings, such as separable bearings, can roll the body, and the outer race raceway surface has been inspected. For large bearings, because they cannot rotate by hand, pay attention to check the raceway, cage and wall of the rolling element, such as appearance. For the importance of higher bearings, they should be checked more carefully.Influence analysis of noise caused by limit speed of imported bearing
When inspecting the rivet head, the main observation is whether there is a relationship between skew and loose welding position is incorrect. Welding quality. Whether the welding point is too small, whether there is welding or welding, the problem caused by solid ball card. Bearing testing requires special attention in the process. There are also some problems that need attention.Influence analysis of noise caused by limit speed of imported bearing
Let’s share with you the experience of many years in the local bearing inspection. Timken bearing’s secondary inspection of the environment should be in the light environment, which is astigmatism, so as to better observe the appearance of the bearing on the surface and be free of cracks and other abnormalities. In the process of cloud like mechanical wear, scratches and touch pressure, the bearing equipment will lead to displacement, poor equipment position, flat bearing shape, load and stress concentration, and reduce accuracy and service life.Influence analysis of noise caused by limit speed of imported bearing
In addition to paying special attention to the pollutants in the working environment or water, which may lead to bearing rust, rust is to lead to bad Timken bearing installation, early wear will lead to more serious waste. Therefore, special attention should be paid to the moisture in water, of course.Influence analysis of noise caused by limit speed of imported bearing
The assembly quality index of ina imported bearings, that is, the assembly accuracy requirements are mainly radial clearance and width. There is a certain functional relationship between axial clearance and radial clearance. Therefore, the axial clearance can be indirectly controlled by controlling the radial clearance.Influence analysis of noise caused by limit speed of imported bearing
For deep groove ball bearings, cylindrical roller bearings, self-aligning ball bearings and self-aligning roller bearings, the radial clearance is mainly controlled.Influence analysis of noise caused by limit speed of imported bearing
For thrust ball bearing, thrust roller bearing and tapered roller bearing, the height and width are mainly controlled.
For angular contact ball bearings, the contact angle is mainly controlled.Influence analysis of noise caused by limit speed of imported bearing
The basic requirements of rolling bearing assembly are: on the premise of ensuring the assembly quality index, the sleeve rate should be high, which should generally be more than 95%.Influence analysis of noise caused by limit speed of imported bearing
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.Influence analysis of noise caused by limit speed of imported bearing
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. Influence analysis of noise caused by limit speed of imported bearing
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.Influence analysis of noise caused by limit speed of imported bearing
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. Influence analysis of noise caused by limit speed of imported bearing
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.
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.Influence analysis of noise caused by limit speed of imported bearing
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.Influence analysis of noise caused by limit speed of imported bearing
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 bearing lubricant If the bearing operates for a long time at a temperature of more than 125 ℃, the service life of the bearing will be reduced
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
Check the condition of the running machine and monitor it to avoid equipment shutdown
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
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.Influence analysis of noise caused by limit speed of imported bearing
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
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.Influence analysis of noise caused by limit speed of imported bearing
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.Influence analysis of noise caused by limit speed of imported bearing
The dry compressed air is mixed with the lubricating oil through the sprayer to form an oil mist. In the jet bearing, the airflow can effectively cool the bearing and prevent impurities from entering. This method is suitable for lubrication of high speed and high temperature bearing parts.Influence analysis of noise caused by limit speed of imported bearing
Use the oil pump to inject 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 a 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. Influence analysis of noise caused by limit speed of imported bearing
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.Influence analysis of noise caused by limit speed of imported bearing
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.Influence analysis of noise caused by limit speed of imported bearing
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.Influence analysis of noise caused by limit speed of imported bearing
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.Influence analysis of noise caused by limit speed of imported bearing
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.Influence analysis of noise caused by limit speed of imported bearing
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.Influence analysis of noise caused by limit speed of imported bearing
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. 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.Influence analysis of noise caused by limit speed of imported bearing
Next, let’s look at the effect of temperature on the bearing.
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. If the temperature of the bearing exceeds 125 ℃ for a long time, the service life of the bearing will be reduced. The causes of high temperature bearings include insufficient or excessive lubrication and lubricant. It contains impurities, excessive load, bearing ring damage, insufficient clearance, high friction caused by oil seal, etc.Influence analysis of noise caused by limit speed of imported bearing
Therefore, it is necessary to continuously monitor the bearing temperature, whether it is measuring the bearing itself or other important parts. If the operating conditions remain unchanged, any temperature change can indicate that a fault has occurred.Influence analysis of noise caused by limit speed of imported bearing
The periodic measurement of bearing temperature can be aided by thermometer, such as digital thermometer, which can accurately measure the bearing temperature and display it in ℃ or Fahrenheit. Important bearing means that when it is damaged, it will cause equipment shutdown. Therefore, this kind of Timken imported bearing should be equipped with temperature detector. Influence analysis of noise caused by limit speed of imported bearing
When Timken imported bearing rotates, the raceway surface of inner ring and outer ring is in rolling contact with the rolling element, so the running track is a dark surface. The running track attached to the raceway surface is not abnormal, so the load conditions can be known. Therefore, please pay close attention and observe the running track of the raceway surface when the bearing is removed. If you carefully observe the running track, you will know that it only bears radial load, large axial load, moment load, or extreme uneven rigidity on the bearing housing.Influence analysis of noise caused by limit speed of imported bearing
It can be checked whether the imported Timken bearing is added with unexpected load and whether the installation error is too large, which will become a clue to investigate the cause of bearing damage.Influence analysis of noise caused by limit speed of imported bearing
If there is no wrong selection and can be used correctly, it will take a long time before the service life of the bearing. In this case, the damage state is peeling. On the other hand, there is the early damage that can not withstand the use unexpectedly. As the cause of the early damage, there are insufficient consideration on the use and lubrication, and then there are foreign matter intrusion, the error of bearing assembly and the large deflection of the shaft, and the insufficient research on the shaft and bearing housing.Influence analysis of noise caused by limit speed of imported bearing
The grooves and grooves make the oil film of lubricating oil thin or damaged, resulting in local wear of Timken inlet bearing; Influence analysis of noise caused by limit speed of imported bearing
Abnormal wear of sliding bearing is caused by axis deflection, load deflection, hard spots and oil stains between bearing steel back and bearing seat hole, insufficient stiffness of shaft or bearing, etc;
Foreign matters enter the bearing working face. When the foreign matters exceed the small oil film thickness, the oil film will be damaged, resulting in wear;Influence analysis of noise caused by limit speed of imported bearing
When the supply of lubricating oil is insufficient or interrupted due to too little oil and too low oil pressure, the normal oil film cannot be established, resulting in direct contact between the shaft and the bearing metal, resulting in wear or heating;
Due to improper assembly, the interference fit between the bearing and the bearing seat is poor, the bearing cover is misaligned, the position of the oil hole is skewed, and the central line of the shaft and the bearing is skewed, resulting in loose bearing, fretting or incomplete contact between the inner hole of the bearing and the bearing seat, resulting in bearing wear and even surface peeling;Influence analysis of noise caused by limit speed of imported bearing
Poor interference of bearing bush. There is no interference between the steel back and the outer side of the bearing seat, which will cause wear between the steel back and the outer side of the bearing seat; The excessive interference reduces the inner hole of Timken imported bearing, which is not easy to form oil film, resulting in premature wear and even seizure.Influence analysis of noise caused by limit speed of imported bearing
Formulate a scientific maintenance system. Regularly overhaul the lubrication system, regularly check the oil pump, filter and cooler, regularly and comprehensively measure various quality indexes of the lubricating oil, and change the oil according to the quality;
Select appropriate lubricating oil and use fine mesh filter; Thoroughly clean the lubricating oil circuit before assembly and avoid foreign matters during installation. Ensure that the bearing seal and pipeline seal are in good condition, and maintain the efficient working state of the oil filter; Improve the design of oil groove and hole, optimize the position of oil circuit, ensure the normal oil circuit and prevent oil leakage; Improve the assembly process, select the appropriate bearing bush interference, and completely remove the foreign matters on the back of Timken imported bearing and other assembly parts.Influence analysis of noise caused by limit speed of imported bearing
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