Some professionals are required to inspect the bearings regularly, so as to find potential problems early, prevent unexpected machine suspension, enable production and improve the productivity and efficiency of the factory.
Importance of test run inspection to installation quality of ina thrust ball bearing
During the use of articulated bearings, the basic external conditions of the operation of imported ina bearings should be monitored frequently, such as the measurement of temperature, vibration and noise, so as to prevent accidents.Importance of test run inspection to installation quality of ina thrust ball bearing
These operations may accelerate fatigue and reduce the service life of bearings and damage the service life of other machine parts. In addition, increased vibration and friction may greatly increase energy consumption and the risk of premature failure. However, after the joint bearing is installed, if it is not carefully aligned, the alignment may cause the bearing to suffer additional load, friction and vibration. As a result, the bearing is damaged prematurely, so it should be aligned and straightened!Importance of test run inspection to installation quality of ina thrust ball bearing
If the bearing considers lubrication, the lubricity of oil lubrication is dominant. However, grease lubrication can simplify the advantages of the surrounding structure of imported ina bearings. In the process of operation, the bearing requires correct re lubrication, which can make the bearing operate healthily.
In order to make the bearing function well, first of all, choose the lubrication method suitable for the use conditions and purpose. Whether it is oil lubrication or grease lubrication depends on the specific situation of the bearing!Importance of test run inspection to installation quality of ina thrust ball bearing
Use proper tools for removal, which will help prevent damage to other machine components. Incorrect removal technology may cause damage to the bearing. If the bearing reaches its final service life, it should be replaced. Importance of test run inspection to installation quality of ina thrust ball bearing
Although the bearing can no longer be used, correctly removing the original bearing and replacing the new bearing in time can play a good role in promoting the extension of the service life of the new bearing. Therefore, the replacement of the old and the new is very important, which requires professional personnel to check and operate
The working temperature of the moving bearing can be monitored at any time by using the thermal sensor, and the automatic alarm or rest can be realized when the temperature exceeds the specified value to prevent the occurrence of combustion shaft accidents. High temperature often indicates that the imported ina bearing has been in an abnormal condition.Importance of test run inspection to installation quality of ina thrust ball bearing
High temperature is also harmful to the lubricant of the bearing. Sometimes bearing overheating can be attributed to the lubricant of the bearing. If the temperature of the joint 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.
Therefore, it is necessary to continuously monitor the temperature of moving bearing, whether it is measuring the bearing itself or other important parts. If the operation premise remains unchanged, any temperature change can indicate that a fault has occurred.Importance of test run inspection to installation quality of ina thrust ball bearing
The regular measurement of bearing temperature can be aided by thermometer, such as digital thermometer, which can accurately measure the temperature of imported INA Bearing and display it in ℃ or Fahrenheit.Importance of test run inspection to installation quality of ina thrust ball bearing
The temperature of the bearing can be inferred from the temperature outside the bearing chamber. If the oil hole can be used to directly measure the temperature of the outer ring of the bearing, the bearing is more suitable. Usually, the temperature of the joint bearing starts to rise slowly with the operation of the bearing, and reaches a stable state after 1-2 hours. Importance of test run inspection to installation quality of ina thrust ball bearing
The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are appropriate, the bearing temperature will rise sharply and abnormal high temperature will appear. At this time, it is necessary to stop the operation and take necessary preventive measures.Importance of test run inspection to installation quality of ina thrust ball bearing
Another lubrication method of bearing – oil mist lubrication, which is a kind of micro lubrication. Simply speaking, it refers to using a small amount of lubricating oil to meet the lubrication requirements of moving bearings.
Oil mist lubrication is to change the lubricating oil into oil mist in the oil mist generator and lubricate the joint bearing through oil mist. Because the oil mist condenses into oil droplets on the working surface of the movable bearing, in fact, the movable bearing still maintains the state of thin oil lubrication. Pay attention to the following two points when using this lubrication method:Importance of test run inspection to installation quality of ina thrust ball bearing
The viscosity of oil shall not be higher than 340mm / S (40 degrees) generally. Due to too high viscosity, the atomization effect will not be achieved.
The lubricated oil mist may escape with the air and pollute the environment. If necessary, oil-gas separator can be used to collect oil mist, or ventilation device can be used to exhaust exhaust gas.Importance of test run inspection to installation quality of ina thrust ball bearing
When the linear speed of the moving body of imported ina bearing is very high, oil mist lubrication is often used to avoid increasing the working temperature of the moving bearing due to excessive oil supply and increased internal friction of oil. Generally, the oil mist pressure is about 0.05-0.1mbar.Importance of test run inspection to installation quality of ina thrust ball bearing
In order to check whether ina bearing is installed correctly, test run inspection shall be carried out after installation.Importance of test run inspection to installation quality of ina thrust ball bearing
For small machinery, turn the rotating part by hand to check the rotation flexibility of thrust ball bearing. If there are no following abnormalities, then check the power operation.Importance of test run inspection to installation quality of ina thrust ball bearing
Stuck cause: foreign matter intrusion, scar on rolling part, etc
Excessive torque cause: friction of sealing device, too small clearance, installation error, etc.Importance of test run inspection to installation quality of ina thrust ball bearing
Unbalanced rotating torque – cause: incorrect installation, installation error, etc.
For large machinery that cannot be turned by hand, it can be started under no-load state first, and then turn off the power immediately for inertial operation. At this time, after confirming that there is no abnormal vibration or noise and the rotation is normal, enter the power operation.Importance of test run inspection to installation quality of ina thrust ball bearing
When entering power operation, start at low speed and no load and gradually reach the specified operating conditions. The power operation inspection is mainly based on the sound, temperature rise and vibration. The cause shall be found out immediately, and the INA Bearing shall be removed for inspection when necessary.
Generally, a sound stick can be used for the sound inspection of INA Bearing.
The temperature inspection of ina bearing can generally be inferred from the shell temperature, but it is correct to directly measure the temperature of the outer ring of thrust ball bearing by using oil hole, etc.
When the bearing temperature rises, first judge whether there is misoperation. If it does rise, the following treatment shall be carried out:Importance of test run inspection to installation quality of ina thrust ball bearing
Check whether the cooling water pressure, water flow and pipeline system are normal. If the water pressure is low, the filter may be blocked and cannot be handled in time, it can be shut down for treatment. When it is confirmed that it can work, it can be put into use.Importance of test run inspection to installation quality of ina thrust ball bearing
Check the oil pressure of the governor. If the oil pressure is low, the cooling water hydraulic valve may be closed.
Check the thrust ball bearing for abnormal sound, INA Bearing and check whether the bearing swing is abnormal.
Take an oil sample to observe whether the oil color has changed, and test to see whether it has deteriorated. If the deterioration is confirmed, stop the machine and replace it with new oil.Importance of test run inspection to installation quality of ina thrust ball bearing
Check whether the oil level of the oil gauge is normal. If not, check whether the oil drain valve of the oil tank is tightly closed. If it has been closed tightly, oil shall be added. If it is oil leakage from the sealant pad, it shall be shut down for treatment.
When using INA Bearing, if it is found that the temperature is very high, stop the equipment immediately, find out the cause, and deal with it according to the solutions provided above. However, the solutions may be different due to the different causes of heating of thrust ball bearing, so it is still necessary to treat the specific situation with the help of technicians.
In addition to excellent quality, NSK bearing is also a very precise part. It is both a high-performance bearing. If it is not properly used in the application process, it will not only fail to achieve the expected functional effect, but also easily damage the bearing. Everyone must have paid attention to lubrication.Importance of test run inspection to installation quality of ina thrust ball bearing
Generally speaking, the bearing quality of high-temperature bearings is very strong, which is not comparable to ordinary bearing products, but even bearings can be good or bad. For example, the quality of bearings produced in authentic Japan is much better than that produced by domestic joint ventures. So how to detect the quality of NSK Bearings!Importance of test run inspection to installation quality of ina thrust ball bearing
One cage is better than two bodies
Although the new technology uses the integrated cage, it only saves materials, and the performance of rotation is worse than that of the two bodies. In general, the service life of the bearing is related to three factors: one is the quality of the bearing itself. The second is the use environment. The third is the installation method.
Whether the chamfer is bright
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 is increased. However, some people think that the chamfering is black and not good-looking, which is not completely processed. This is a misunderstanding.
Feel the bearing quality through the surface
Many customers say that as long as the bearing surface is bright, it is of good quality, which is wrong. The brightness of the bearing surface should be a kind of dark brightness. The reason for this dark brightness is whether the steel used for high-temperature bearing meets the standard and its grinding process and cutting fluid, mainly the first two items.
Even if a small amount of dust invisible to the naked eye enters the bearing, it will add wear, vibration and noise to the bearing. When taking NSK Bearings directly by hand, fully wash the sweat from your hands and apply high-quality mineral oil before stopping the operation. Pay special attention to rust prevention in rainy season and summer. 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. Importance of test run inspection to installation quality of ina thrust ball bearing
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 the bearing, such as the clamping damage of the ring and retaining edge of the roller bearing, these reasons can be considered. Importance of test run inspection to installation quality of ina thrust ball bearing
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.Importance of test run inspection to installation quality of ina thrust ball bearing
However, if we know the use machinery and conditions of NSK bearing, the structure around the high-temperature bearing, understand the situation before and after the accident, and investigate the damage state of the bearing and several causes, we can prevent the recurrence of similar accidents.Importance of test run inspection to installation quality of ina thrust ball bearing
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 reasons for the damage of high-temperature bearing. Therefore, enterprises should pay more attention to these aspects in the use of bearing to prevent the damage of bearing and affect the work.Importance of test run inspection to installation quality of ina thrust ball 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.
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.
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.Importance of test run inspection to installation quality of ina thrust ball 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. Importance of test run inspection to installation quality of ina thrust ball 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.Importance of test run inspection to installation quality of ina thrust ball bearing
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.Importance of test run inspection to installation quality of ina thrust ball bearing
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. Importance of test run inspection to installation quality of ina thrust ball bearing
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.Importance of test run inspection to installation quality of ina thrust ball 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.Importance of test run inspection to installation quality of ina thrust ball 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 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.Importance of test run inspection to installation quality of ina thrust ball bearing
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. Importance of test run inspection to installation quality of ina thrust ball bearing
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. Importance of test run inspection to installation quality of ina thrust ball bearing
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