Cleaning process and precautions of electric NSK bearing
Give a brief introduction electric NSK bearing
As one of the widely used NSK Bearings in daily life, electric NSK bearing will inevitably encounter various problems in its use. Today, we will discuss the cleaning process of electric NSK bearing
According to the service time, the motor should be cleaned and refueled after 2000 hours. There are two cleaning methods for NSK Bearings:NSK bearing
Hot oil cleaning method for NSK Bearings hardened with soft dry oil or antirust paste due to long use, they should be immersed in 100-200 ℃ hot engine oil, clamp NSK Bearings with pliers, and clean the oil on NSK Bearings with a brush. The soft dry oil or antirust paste will melt when heated to 100-200 ℃, which is easy to wash out from the gap of NSK bearing. Sometimes, just shake the NSK bearing in the oil for many times. Oil will also flow away from the gap.Cleaning process and precautions of electric NSK bearing
When cleaning the centripetal spherical NSK bearing of old motor or imported motor, the ball, bead frame and inner ring should be turned laterally from the outer ring and then immersed in hot oil. When cleaning the short cylindrical roller NSK bearing, the roller, bead frame, inner ring and outer ring should also be separated.Cleaning process and precautions of electric NSK bearing
During hot oil cleaning, the oil temperature shall not exceed 20 ℃. When heating directly with open fire, attention should be paid to prevent the oil from burning. NSK bearing should be hung in the oil pan and sink to the bottom, which will cause overheating and reduce the hardness.Cleaning process and precautions of electric NSK bearing
General cleaning method: soak NSK bearing in kerosene for 5-10 minutes, hold the inner ring with one hand and rotate the outer ring with the other hand, and the dry oil or anti rust paste on NSK bearing will fall off. Then put the NSK bearing into clean kerosene, brush it with a soft brush, clean the oil stain in the ball and gap, then put it into gasoline for cleaning once, take it out and put it on clean paper. Cleaning process and precautions of electric NSK bearing
When cleaning centripetal spherical ball NSK bearing and short cylindrical roller NSK bearing, the ball, bead holder, inner ring and outer ring shall be separated for cleaning.Cleaning process and precautions of electric NSK bearing
The NSK bearing installed on the shaft is cleaned mainly by spraying oil or spraying with an oil gun. The oil stains that are easy to be cleaned are first cleaned with kerosene and then gasoline; For oil stains that are difficult to be cleaned, first wash them with 100-200 ℃ hot engine oil or spray them with an oil gun, and then clean them with gasoline. NSK bearing
Be careful not to scrape NSK bearing with sharp tools: hard oil dirt or rust, so as not to damage the smoothness of NSK bearing rolling body and groove ring. Clean NSK bearing and dry it with clean cloth.Cleaning process and precautions of electric NSK bearing
The rolling NSK bearing is widely used by users.
When using the rolling IKO bearing, we must pay attention to maintenance. If the rolling IKO bearing is damaged, how can we deal with it? First of all, let’s understand what is rolling IKO bearing? How to use IKO bearing correctly? Now let me explain the relevant knowledge to you, hoping to help you.NSK bearing
Rolling bearing is a kind of precision mechanical element that changes the sliding friction between the running shaft and the shaft seat into rolling friction, so as to reduce the friction loss
The damage of rolling IKO bearing includes the following situations:
On the one hand, if the rolling IKO bearing can be used correctly without selection error, it can be used for a long time before the service life of IKO bearing.
On the other hand, there are unexpected early damage, and the early damage that can not withstand use. As the reasons for this early damage, there are insufficient consideration on use and lubrication, and then there are foreign matter intrusion, IKO bearing assembly error and shaft burning, insufficient research on shaft and IKO bearing housing, etc. In other words, there are many cases where these reasons coincide with each other.
How to avoid the reoccurrence of rolling NSK bearing damage
On the basis of fully understanding the machines used by IKO bearings, service conditions and the peripheral structure of IKO bearings, we must find out what factors are the main conditions, and then investigate in combination with the damage of IKO bearings and various reasons, so as to prevent the recurrence of similar accidents.NSK bearing
The outer spherical ina bearing is also a common ina bearing type. What is the outer spherical INA Bearing? How does the outer spherical INA Bearing work? What are its characteristics?
Question 1: what is the concept of outer spherical INA Bearing?
Answer 1: the outer spherical ball ina bearing is actually a variant of the deep groove ball INA Bearing, which is characterized in that the outer diameter surface of its outer ring is spherical and can be matched into the corresponding concave spherical surface of ina bearing seat to play the role of centering.
Question 2: what are the characteristics of outer spherical ina bearings?
Answer 2: the outer spherical ina bearings are mostly used in rough machinery.
When the installation and positioning are not accurate enough, the axis to neutral difference between the shaft and the seat hole, or the shaft is long and the deflection is large, and the accuracy of ina bearings is not high enough, and some structures are rough. Therefore, the actual performance of common performance is quite discounted compared with deep groove ball ina bearings of the same specification.
Question 3: how does the outer spherical NSK bearing work?
Answer 3: it is mainly used to bear the combined radial and axial load dominated by radial load. Generally, it is not suitable to bear the axial load alone. This ina bearing can be installed with inner ring (with full set of rollers and retainer) and outer ring respectively.
\The outer spherical ina bearing does not allow the shaft to tilt relative to the housing, which will produce additional axial force under radial load. The axial clearance of outer spherical ina bearing has a great relationship with whether ina bearing can work normally.
When the axial clearance is too small, the temperature rise is high; Ina bearing is easy to be damaged when the axial clearance is large. Therefore, during installation and operation, special attention should be paid to adjusting the axial clearance of INA Bearing. If necessary, pre interference installation can be carried out to increase the rigidity of INA Bearing.
Deep groove ball bearing is a common type of NSK bearing.
The basic deep groove ball bearing is composed of an outer ring, an inner ring, a group of steel balls and a group of retaining structures.Cleaning process and precautions of electric NSK bearing
NTN bearing is a representative rolling bearing with a wide range of applications. It is suitable for high speed or even extremely high speed operation, and it is very durable without regular maintenance. Moreover, this kind of NTN bearing has the advantages of small friction coefficient, high limit speed, simple structure, low manufacturing cost and high manufacturing accuracy.Cleaning process and precautions of electric NSK bearing
The size range and forms vary widely. It is used in precision instruments, low-noise motors, automobiles, motorcycles and general machinery industries. Cleaning process and precautions of electric NSK bearing
It is a kind of NTN bearing widely used in the machinery industry. It mainly bears radial load and a certain amount of axial load.Cleaning process and precautions of electric NSK bearing
When choosing a larger radial clearance, the axial bearing capacity increases, and the contact angle is zero when bearing pure radial force. When there is axial force, the contact angle is greater than zero. Generally, stamping wave cage, turning solid cage and sometimes nylon cage are used.Cleaning process and precautions of electric NSK bearing
The NTN bearing can be installed in the axial clearance range of the two-way shaft, so the NTN bearing can be installed in the axial clearance range of the two-way shaft. In addition, this kind of NTN bearing also has a certain centering ability.Cleaning process and precautions of electric NSK bearing
When it is inclined by 2 ′～ 10 ′ relative to the shell hole, it can still work normally, but it has a certain impact on the service life of NTN bearing. NTN bearing cages are mostly steel plate stamping wave cages, and large NTN bearings mostly adopt vehicle made metal solid cages.Cleaning process and precautions of electric NSK bearing
NTN bearings are commonly used in gearboxes, instruments and meters, motors, household appliances, internal combustion engines, traffic vehicles, agricultural machinery, construction machinery, engineering machinery, etc. With the progress and development of society, mechanization has been widely used in production and life. As an indispensable part of machinery, NTN bearing will be used more and more widely, because NTN bearing will be used wherever there is rotation.Cleaning process and precautions of electric NSK bearing
NTN bearing is mainly used to support and reduce friction in machinery, so the accuracy and noise of NTN bearing are directly related to the service life of machinery.Cleaning process and precautions of electric NSK bearing
NTN bearing models are generally selected by users’ technicians according to the service conditions and load of supporting products. If the NTN bearing fails to meet the use requirements, it should be recommended to re select the model as soon as possible, but unless special products, there will generally be no problem in selecting the model.Cleaning process and precautions of electric NSK bearing
NSK bearing is a high-precision product.
If it is not assembled properly, it is easy to damage the NTN bearing channel, resulting in the damage of NTN bearing. NTN bearing shall be equipped with a special mold during assembly, which can not be knocked at will. When pressing the shaft, only a small ring can be stressed, and when pressing a large ring, only a large ring can be stressed. Cleaning process and precautions of electric NSK bearing
Pneumatic or hydraulic pressure is required during assembly. During press assembly, the upper and lower molds shall be outside the horizontal state. If there is inclination, the NTN bearing channel will be damaged due to stress and the NTN bearing will produce conduction sound.Cleaning process and precautions of electric NSK bearing
The service life of NTN bearing is closely related to manufacturing, assembly and use. It must be done well in each link in order to make NTN bearing in the running state, so as to prolong the service life of NTN bearing.Cleaning process and precautions of electric NSK bearing
The first is to identify and check the rolling sound of NTN bearing
We can use sound detector to check the rolling sound and sound quality of Timken bearing in operation. Because Timken bearing will emit abnormal sound and irregular sound even if there is slight peeling and other damage, it can be distinguished by sound detector to prevent it in advance.
Secondly, the vibration of Timken bearing in operation is identified and checked
Timken bearing vibration is very sensitive to the damage of Timken bearing. For example, peeling, indentation, corrosion, crack, wear, etc. will be reflected in the vibration measurement of Timken bearing. Therefore, the vibration can be measured by using a special Japanese Timken 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 Timken bearing or the installation position of sensor, so it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
After that, check according to the temperature of Timken bearing
The temperature of Timken bearing can generally be inferred from the temperature outside the Timken bearing chamber in Japan. It is more appropriate if the outer ring temperature of Timken bearing can be directly measured by oil hole. Usually, the temperature of Timken bearing rises slowly with the start of operation and reaches a stable state after 1-2 hours. The normal temperature of Timken bearing varies with the heat capacity, heat dissipation, speed and load of the machine.
If the lubrication and installation parts are appropriate, the Timken 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. According to a large number of test data, since the temperature is affected by lubrication, speed, load and environment, the value in the table only represents the approximate temperature range. Using the thermal sensor, the working temperature of Timken bearing can be monitored at any time, and the automatic alarm or stop when the temperature exceeds the specified value can be realized to prevent the occurrence of combustion shaft accident
In order to improve the actual fitting accuracy of NTN bearing during installation, it is necessary to accurately measure the fitting surface dimensions of the inner hole and outer circle of NTN bearing by using the measurement methods and tools that do not deform the NTN bearing. NTN bearing
All the measurement items related to the inner diameter and outer diameter can be measured, and the measured data can be comprehensively analyzed. Based on this, the dimensions of the installation parts of Japanese NTN bearing that accurately match the shaft and seat hole can be measured. NSK bearing
When actually measuring the corresponding size and geometry of the matched shaft and seat hole, it shall be carried out under the same temperature conditions as when measuring NTN bearing.NTN bearing
In order to ensure a high actual matching effect, the roughness of the surface of the shaft and seat hole matched with the NTN bearing shall be as small as possible.NTN bearing
During the above measurement, two groups of marks indicating the direction of large deviation shall be made on the outer circle and inner hole of NTN bearing and the corresponding surface of shaft and seat hole on both sides close to the assembly chamfer, so as to align the large deviation of matching two sides with the same direction during actual assembly, so that the deviation of both sides can be partially offset after assembly.NTN bearing
The purpose of making two groups of orientation marks is to comprehensively consider the compensation of deviation, not only improve the rotation accuracy of the supports at both ends, but also partially eliminate the coaxiality error of the seat hole between the two supports and the journal at both ends. NTN bearing
The implementation of surface strengthening measures on the mating surface, such as sand blasting, using a precision plug with a slightly larger diameter to plug the primary inner hole, etc., are conducive to improving the mating accuracy.NTN bearing