After the ina bearing is installed, in order to check whether the installation is correct, the operation inspection shall be carried out. Small machinery can be rotated by hand to confirm whether it rotates smoothly. The inspection items include poor operation caused by foreign matters, scars and indentation, unstable torque caused by poor installation and poor processing of mounting base, excessive torque caused by too small clearance, installation error and sealing friction, etc. If there is no abnormality, the power operation can be started.How to check ina bearing operation
Large machinery cannot rotate manually, so the power shall be cut off immediately after no-load start, and the machinery idles. Check whether there is vibration, noise, contact of rotating parts, etc. after confirming that there is no abnormality, enter the power operation.How to check ina bearing operation
Power operation, starting from no-load low-speed, slowly increase to the rated operation under the specified conditions. During the test run, the inspection items are whether there is abnormal sound, ina bearing temperature change, lubricant leakage or discoloration, etc. If any abnormality is found, stop the operation immediately, check the machinery, and remove the bearing for inspection if necessary.How to check ina bearing operation
Ina bearing temperature can generally be inferred from the external temperature of the bearing pedestal. However, it is more accurate to directly measure the temperature of the bearing outer ring by using the oil hole. The bearing temperature rises gradually from the beginning of operation, and the temperature is usually stable after 1 ~ 2 hours.How to check ina bearing operation
If the bearing is not installed properly, the temperature will rise sharply, resulting in abnormal high temperature. The reasons are too much lubricant, too small bearing clearance, poor installation, excessive friction of sealing device, etc. In the case of high-speed rotation, the wrong selection of INA Bearing Structure and lubrication mode is also the reason.How to check ina bearing operation
The rotating sound of ina bearing is checked with stethoscope, and there are strong metal noise, abnormal sound, irregular sound and other indications of abnormality. The reasons are poor lubrication, poor accuracy of shaft or bearing seat, bearing damage, foreign matter intrusion, etc. Internal factors mainly refer to the three factors that determine the quality of Timken imported bearings, such as structural design, manufacturing process and material quality.How to check ina bearing operation
First, the reasonable design and advanced nature of the structure will lead to longer TIMKEN 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 TIMKEN imported bearings.How to check ina bearing operation
Among them, the heat treatment and grinding processes that affect the quality of Timken imported bearings are often more directly related to the failure of bearings. In recent years, the research on the metamorphic layer of the bearing working surface shows that the grinding process is closely related to the surface quality of Timken imported bearings.How to check ina bearing operation
The metallurgical quality of Timken imported bearing materials was once the main factor affecting the early failure of Timken imported 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 Timken imported bearing failure analysis has decreased significantly, but it is still one of the main influencing factors of Timken imported bearing failure. Proper material selection is still a factor that must be considered in bearing failure analysis.How to check ina bearing operation
The main task of Timken 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 Timken imported bearings and avoid sudden early failure of Timken imported bearings.How to check ina bearing operation
For sealed Timken imported bearings, appropriate grease has been filled during production; For the bearing, a sealing device is also set in the main engine to prevent the leakage of lubricating grease.How to check ina bearing operation
There is a problem of how much grease should be injected into Timken imported bearings.How to check ina bearing operationHow to check ina bearing operation
Too little grease injection is easy to cause lack of grease or dry friction and affect service life. Excessive grease injection will lead to a large amount of grease leakage, which will not only pollute the environment, but also cause waste. It can be seen that the amount of grease injected into Timken imported bearing is the less the better on the premise of ensuring the full lubrication of Timken imported bearing.How to check ina bearing operation
Advantages and disadvantages of grease lubrication under normal working conditions, grease lubrication can be used for most Timken imported bearing applications.How to check ina bearing operation
The advantage of grease is that it is easier to retain in Timken imported bearing configuration, especially in applications where the vertical axis or axis is inclined at a certain angle. The grease also has the function of sealing, which can prevent the influence of pollutants, moisture or moisture on Timken imported bearings. However, if there is too much grease, it will lead to the increase of bearing working temperature, especially in the application of high speed. How to check ina bearing operation
In most cases, the Timken inlet bearing can be completely filled with grease only at the initial stage, while the Timken inlet bearing seat is only filled with an appropriate amount of grease and left with a certain free space. Before fully reaching the working speed, the excess grease must be discharged from the bearing during the running in stage, so that an appropriate amount of grease can be left in the Timken inlet bearing. When the operating temperature drops significantly, it indicates that the grease has run in with the bearing and is evenly distributed in the Timken imported bearing configuration.How to check ina bearing operation
After fag bearing installation, in order to check whether the installation is correct, operation inspection shall be carried out. Small machinery can be rotated by hand to confirm whether it rotates smoothly. The inspection items include poor operation caused by foreign matters, scars and indentation, unstable torque caused by poor installation and poor processing of mounting base, excessive torque caused by too small clearance, installation error and sealing friction, etc. If there is no abnormality, the power operation can be started.How to check ina bearing operation
Large machinery cannot rotate manually, so the power shall be cut off immediately after no-load start, and the machinery idles. Check whether there is vibration, noise, contact of rotating parts, etc. after confirming that there is no abnormality, enter the power operation.How to check ina bearing operation
Power operation, starting from no-load low-speed, slowly increase to the rated operation under the specified conditions. During the test run, the inspection items are whether there is abnormal sound, FAG bearing temperature change, lubricant leakage or discoloration, etc. If any abnormality is found, stop the operation immediately, check the machinery, and remove the bearing for inspection if necessary.How to check ina bearing operation
Fag bearing temperature can generally be inferred from the external temperature of bearing pedestal. However, it is more accurate to directly measure the temperature of the bearing outer ring by using the oil hole. The bearing temperature rises gradually from the beginning of operation, and the temperature is usually stable after 1 ~ 2 hours. If the bearing is not installed properly, the temperature will rise sharply, resulting in abnormal high temperature. The reasons are too much lubricant, too small bearing clearance, poor installation, excessive friction of sealing device, etc. In the case of high-speed rotation, the wrong selection of fag bearing structure and lubrication mode is also the reason.How to check ina bearing operation
The rotation of fag bearing is checked with stethoscope, and there are strong metal noise, abnormal sound, irregular sound and other indications of abnormality. The reasons are poor lubrication, poor accuracy of shaft or bearing seat, bearing damage, foreign matter intrusion, etc. During the inspection, first open the NTN inlet bearing cover, select the lead wire with appropriate diameter, cut it into a small section with a length of 15 ~ 40mm, put it on the journal and the interface between the upper and lower bearings, cover the bearing cover, tighten the fixing bolts according to the specified torque, then loosen the bolts, remove the bearing cover, detect the thickness of the flattened lead wire with a micrometer, and calculate the average value of the top clearance of the NTN inlet bearing.How to check ina bearing operation
If the top clearance is too small, a pad can be added on the joint surface of the upper and lower tiles. If it is too large, the pad shall be reduced, scraped or the tile shall be poured again.How to check ina bearing operation
Adjustment of bearing bush tightening force: in order to prevent the possible rotation and axial movement of the bearing bush during the working process, in addition to the interference and stop parts, the bearing bush must also be compressed with NTN imported bearing cover. The measurement method is the same as the top clearance measurement method. In addition to measuring the thickness of soft lead wire, the bearing bush tightening force can be calculated (expressed by the elastic deformation of the bearing bush after compression)How to check ina bearing operation
Generally, the pressing force of bearing bush is 0.02 ~ 0.04 mm. If the pressing force does not meet the standard, it can be adjusted by increasing or decreasing the thickness of the gasket at the joint surface of NTN inlet bearing and bearing seat, and the pad back is not allowed to be padded.How to check ina bearing operation
In addition to radial clearance, the sliding NTN inlet bearing should also ensure axial clearance. When detecting the axial clearance, move the shaft to an extreme position, and then measure the displacement of the shaft from one extreme position to another with a feeler gauge or dial indicator, that is, the axial clearance.
When the clearance of sliding NTN inlet bearing does not meet the regulations, it shall be adjusted. Split bearings often use shims to adjust the radial clearance (top clearance). Koyo imported bearings show strong regularity and good repeatability in their use. The vibration amplitude of the bearing is relatively small, but the vibration amplitude of the imported bearing is relatively small, which may be caused by the rough surface (such as the vibration spectrum of the imported bearing) at the beginning of use.How to check ina bearing operation
After moving for a period of time, the vibration and noise maintain a certain level, and the spectrum is very single, with only one or two times the frequency. The frequency spectrum above three times of power frequency rarely appears, and the bearing state is very stable and enters the stable working period.
After continued operation and entering the later stage of use, the vibration and noise of Koyo imported bearing began to increase, and sometimes abnormal sound appeared, but the vibration increased slowly. At this time, the bearing kurtosis began to suddenly reach a certain value. We believe that at this time, the imported bearing of Koyo shows initial failure.
At this time, it is required to closely monitor the imported Koyo bearing and pay close attention to its changes. After that, the bearing kurtosis value began to decline rapidly and approached the normal value, while the vibration and noise began to increase significantly, and the increase began to accelerate. When the vibration exceeded the vibration standard (such as ISO2372 standard), the bearing kurtosis value also began to increase rapidly. How to check ina bearing operation
When the vibration standard was exceeded, and the kurtosis value also exceeded the normal value (the relative kurtosis standard is available), we believe that the bearing has entered the late fault production, and the equipment needs to be repaired in time, Replace the Koyo imported bearing.How to check ina bearing operation
Koyo imported bearings show the characteristics of late failure. The time from serious failure (generally bearing damage, such as shaft holding, burn, sand frame crack, raceway, bead wear, etc.) is usually less than one week. The larger the equipment capacity, the faster the speed, and the shorter the interval. Therefore, in the actual Koyo imported bearing fault diagnosis, once the late fault characteristics are found, the bearing fault should be determined and the maintenance should be arranged as soon as possible.How to check ina bearing operation
Although the bearing is metal, it will also be damaged. No matter what hard material it is, it will be damaged, but the degree of damage is different. We all know that Timken bearings are of good quality and made of good steel. Steel is a very solid material, but it will also be damaged. Timken bearings run in the machine every day, and it is easy to damage Timken bearings due to constant friction, Therefore, we should also prevent the damage of Timken bearing, maintain the bearing well, and do not use the bearing indiscriminately, causing unnecessary losses to ourselves.How to check ina bearing operation
So how to deal with the bearing damage. 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 the quality service limit known as 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. How to check ina bearing operationHow to check ina bearing operation
As for the damage state of the bearing, such as the clamping damage of the ring and retaining edge of the roller bearing, these reasons can be considered. These reasons also coincide with insufficient lubricant, unfitness, defects of the oil supply and drainage structure, invasion of foreign matters, bearing installation error and excessive deflection of the shaft. Therefore, only investigating the bearing damage, it is difficult to know the real cause of the damage.How to check ina bearing operation
However, if you know the use machinery, service conditions, the structure around the bearing, understand the situation before and after the accident, and investigate the damage state of the bearing and several causes, you can prevent the recurrence of similar accidents.How to check ina bearing operation
Through the introduction, it can be found that the correct use will not cause damage to the bearing, incorrect installation, external immersion in foreign matters and improper lubrication are the main causes of bearing damage. Therefore, enterprises should pay more attention to these aspects in the use of bearings to prevent bearing damage and affect the work.How to check ina bearing operation
The sound detector is used to check the rolling sound and sound quality of NTN imported bearing in operation, so as to prevent it in advance.
How to check ina bearing operation
Third, check the temperature of NTN inlet bearing during rotation. It is more appropriate if the outer ring temperature of NTN inlet bearing can be directly measured by oil hole. Generally, the temperature of NTN inlet bearing can be inferred based on the temperature outside the NTN inlet bearing chamber. If the lubrication and installation parts are appropriate, the temperature of NTN inlet bearing will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.
Generally, the temperature of NTN imported bearing rises slowly with the start of operation and reaches a stable state after 1-2 hours. The normal temperature of NTN imported bearing varies with the heat capacity, heat dissipation, speed and load of the machine.
Check the axle and find out the faults existing in Peilin before long-distance or race. In the early stage, when Peilin lubrication is seriously deteriorated, eliminate these faults in advance for lubrication or replacement, so as to avoid affecting the level of play due to hardware problems, which is very important for professional drivers and amateur drivers.How to check ina bearing operation
Touch is a very simple method. In industry, the lubrication problem of Peilin can lead to high temperature, which can be felt by hand. This high temperature will be harmful to the lubricant in Peilin. It is difficult for the bicycle to rotate at that high speed, or even reach the ground that makes Peilin hot. The inspection touch of the bicycle is only the axis of the flower drum rotating with the hand mold, which can feel the situation inside, The vibration indicates that there are pits or the beads are not round, and the quicksand feeling is the lack of good lubrication. If the rotation is astringent and stuck, it indicates that the oil is dry or the wrong device has caused Peilin to be misaligned and too tight.How to check ina bearing operation
The observation is mainly aimed at the appearance of Peilin to see whether the rubber seal has been broken. Open the rubber seal to check whether the lubricating oil is dry. Blackening means that the lubricating oil is polluted or carbonized. Whiteness and turbidity indicates water inflow. In this case, the earlier it is found, the smaller the damage after oil change. However, the long-term use of such oil can cause irreversible damage to Peilin.How to check ina bearing operation
Listen, electronic stethoscope is commonly used in industry to check the condition of Peilin. The low whine indicates that Peilin is working normally, while the hiss, sharp chirp or other irregular business indicates that NTN imported bearings are in an abnormal working state.How to check ina bearing operation
The sharp chirp may be caused by improper lubrication, which causes metal friction, while the hissing sound may be the pollution of lubricating oil. The irregular noise is caused by the vibration caused by the indentation of the raceway. In the absence of an electronic stethoscope, the bicycle has a very simple method. Put a wooden stick on the front fork or rear fork and turn it. This method can also be used for the center axle, but it is difficult to judge because the sound of the center axle will be mixed with the rear axle. How to check ina bearing operation
There are two kinds of lubricants commonly used in Koyo bearings: lubricating oil and grease. When the circumferential speed of the shaft is less than 4-5m / s, or the parts on the vehicle that cannot be lubricated with lubricating oil, they shall be lubricated with grease. The advantage of grease lubrication is that the sealing structure is simple, the grease is not easy to lose, and it is not affected by temperature. Adding grease once can be used for a long time.How to check ina bearing operation
Two problems should be paid attention to when using grease. One is to select the appropriate brand of grease according to the requirements of the automobile manual. For example, nano base grease should not be selected for automobile water pump bearing because of its poor water resistance. The second is to add an appropriate amount of lubricating grease into the Koyo bearing. How to check ina bearing operation
Generally, it is appropriate to fill only 1 / 2-L / 3 of the cavity of the Koyo bearing. Too much is not only useless, but also increases the running resistance of the Koyo bearing and heats it up. Special attention should be paid to the automobile hub bearing. It is necessary to advocate “empty hub lubrication”, that is, only apply an appropriate layer of grease on the Koyo bearing. Otherwise, it will not only waste and poor heat dissipation, but also overflow the grease by heating, which may affect the braking performance.How to check ina bearing operation
The advantage of lubricating oil lubrication is low friction resistance and heat dissipation. It is mainly used for Koyo bearings with high speed and high working environment temperature. The brand of lubricating oil shall be selected according to the requirements of the vehicle manual, and shall be replaced in time after the vehicle maintenance cycle. After discharging the old oil, the mechanism shall be cleaned before adding new oil. The oil shall be added to the specified marking line or flush with the oil filler (depending on the specific structure and requirements of the vehicle), and no more oil shall be added.How to check ina bearing operation
The assembly accuracy of cage is guaranteed by special assembly mould, which can fully meet the assembly accuracy requirements of Koyo bearing. How to check ina bearing operation
The condition of small interference fit for the fixed ring is that both sides of the matching surface have high shape accuracy and small roughness, otherwise it will be difficult to install and more difficult to disassemble. In addition, the influence of thermal elongation of the main shaft needs to be considered.How to check ina bearing operation
Surface heat treatment is divided into two categories. One is surface quenching and tempering heat treatment, which uses vibration absorption or vibration isolation devices to reduce Koyo bearing noise or isolate Koyo bearing noise. How to check ina bearing operation
The other is chemical heat treatment. Its hardness test method is as follows: chemical heat treatment is to make the workpiece surface infiltrate atoms of one or more chemical elements, so as to change the chemical composition, organization and performance of the workpiece surface. After quenching and low-temperature tempering, the surface of the workpiece has high hardness, wear resistance and contact fatigue strength, while the core of the workpiece has high strength and toughness.How to check ina bearing operation
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