Timken bearing, in most cases, working state: use appropriate clearance. According to different uses, and in the assembly bearing, the bearing is advanced to make the internal stress and make the negative bearing clearance used. This method is called using preload. More suitable, such as angular contact ball bearings, tapered roller bearings, two family bearings, bearing clearance, can be adjusted.
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.
Specified conditions for regular inspection of SKF imported bearings
Preloading method: the pre positioning of load is the preloading method that the relative position of Timken 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.Specified conditions for regular inspection of SKF imported 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 Timken bearing changes the relative position, the preloading method. When in use, it will even change its relative position, and the preload can be maintained at a certain level.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
When checking Timken 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. 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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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. Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
Bearing cleaning: remove the bearing for repair, record the appearance of the bearing for the first time, confirm the residual 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.Specified conditions for regular inspection of SKF imported bearings
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. Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.
Let’s share with you many years of experience in local bearing testing. 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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
Bearing raceway sound and its control method raceway sound is a smooth and continuous sound made by the rolling body rolling on the raceway surface when the imported bearing is running. It is a unique basic sound that will occur in all rolling bearings. The general bearing sound is the sound of raceway plus other sounds. The raceway sound of ball bearing is irregular, and its frequency is above 1000Hz. Its main frequency does not change with the speed, but its total sound pressure level increases with the speed. Specified conditions for regular inspection of SKF imported bearings
For the bearing with loud raceway sound, the sound pressure level of raceway sound decreases with the increase of viscosity; For bearings with low raceway noise, the sound pressure level changes from decrease to increase when the viscosity increases to more than 20mm2 / s. The greater the rigidity of the bearing pedestal, the lower the total sound pressure level of the raceway sound.Specified conditions for regular inspection of SKF imported bearings
If the radial clearance is too small, the total sound pressure level and dominant frequency of raceway sound will increase sharply with the reduction of radial clearance. The methods to control the sound of raceway are: select low-noise bearings, that is, bearings with small waviness, and carefully select the service conditions. Raceway noise often affects the noise of the whole machinery. Reducing raceway noise can reduce the noise of the whole machinery.Specified conditions for regular inspection of SKF imported bearings
Impact sound of rolling element and its control method when the ball bearing or cylindrical roller bearing of larger model runs at low speed under pure radial load, due to the small centrifugal force of the rolling element, the rolling element in the non load area will impact the cage or raceway and make noise. As the speed increases, the sound disappears. Specified conditions for regular inspection of SKF imported bearings
The control methods of impact sound of rolling elements are: appropriately reduce the radial clearance, and use the bearing of cage with reasonable structure and flexible material.Specified conditions for regular inspection of SKF imported bearings
The rolling sound of imported bearings and its control method rolling sound is the harsh metal friction sound that can occur in cylindrical roller bearings on all occasions. Most of it occurs in larger types of grease lubricated bearings, which is more likely to occur in greases with degraded base oil performance, and almost does not occur in oil lubrication. In addition, it is easy to occur in winter. Specified conditions for regular inspection of SKF imported bearings
When bearing pure radial load, it is easy to occur in the case of large radial clearance, and it is easy to occur in a specific speed range with different models and sizes, both continuously and intermittently. Special processing methods for the outer ring raceway can prevent the occurrence of rolling sound. If necessary, this kind of bearing can be selected, or the radial clearance of the bearing can be appropriately reduced, the lubricating grease with excellent performance can be used and the rigidity of the parts matched with the bearing can be improved.
Standard class (g) tolerance bearing;Specified conditions for regular inspection of SKF imported bearings
Radial bearing only bears radial load and thrust bearing only bears axial load;Specified conditions for regular inspection of SKF imported bearings
0.1C (C is the basic rated dynamic load of the bearing);Specified conditions for regular inspection of SKF imported bearings
Rigid bearing pedestal and shaft;Specified conditions for regular inspection of SKF imported bearings
The lubrication and cooling conditions are normal.Specified conditions for regular inspection of SKF imported bearings
When the imported bearing operates under the load of 0.1C, the contact stress between the rolling element and the contact surface of the raceway increases, resulting in the increase of the working temperature of the bearing and the relative deterioration of the performance of the lubricant. Therefore, the limit speed of the bearing will be reduced accordingly.Specified conditions for regular inspection of SKF imported bearings
For the range of C / = 10, the reduction of limit speed is very small, so it can be ignored, that is, F1 = 1.Specified conditions for regular inspection of SKF imported bearings
For the radial bearing under combined load, due to the increase of the number of rolling elements under load, the increase of friction resistance, the increase of calorific value, the deterioration of lubrication and cooling conditions, and the increase of force acting on the cage, the limit speed of the bearing must be multiplied by a reduction factor F2 according to the bearing type and load angle.Specified conditions for regular inspection of SKF imported bearings
If the limit speed of the selected imported bearing cannot meet the use requirements, some improvement technical measures can be adopted to improve it, so as to meet the more satisfactory requirements. Such as improving the bearing tolerance level; Appropriately increase the clearance; Change to special materials and improve the structure of cage; Change the lubrication mode, such as oil-gas, oil mist and jet lubrication; Improve cooling conditions, etc.Specified conditions for regular inspection of SKF imported bearings
Regular maintenance of mechanical equipment is very important for production. As a precision accessory of mechanical equipment, the regular inspection of SKF imported bearings is particularly critical. Here is the necessity and key steps of bearing regular inspection.Specified conditions for regular inspection of SKF imported bearings
It is important to keep the bearings and lubrication clean
Before inspection, clean the surface of the machine, and then remove the parts around the SKF inlet bearing. The oil seal is a very fragile part, so it needs to be disassembled carefully. Do not apply excessive force, and then carefully check the oil seal and its surrounding parts. If there are bad symptoms, be sure to replace it. The bad oil seal will lead to bearing damage and strict equipment shutdown.Specified conditions for regular inspection of SKF imported bearings
Check the lubricant of the bearing
Rub a little lubricant between your fingers. If there are pollutants, you can feel it, or apply a layer of lubricant on the back of your hand, and then seal it for light inspection.Specified conditions for regular inspection of SKF imported bearings
Replace the lubricant of the bearing
After draining out the old oil, if possible, refill fresh oil into the oil lubricated bearing and let the machine rotate at low speed for a few minutes. Make the engine oil collect residual pollutants as much as possible, and then drain the engine oil. The engine oil is filtered before use.
For grease lubricated bearings, the arbor used when replacing grease should avoid connecting the angle of cotton to any part of the bearing, because these residual fibers may wedge between the rolling parts and cause damage, especially for the application of small bearings.Specified conditions for regular inspection of SKF imported bearings
Cover exposed bearings
When inspecting bearings, never expose SKF imported bearings to pollutants or moisture. If the work is interrupted, the machine shall be covered with oil paper, plastic sheet or similar materials.Specified conditions for regular inspection of SKF imported bearings
If it is possible to clean the naked bearing without disassembly, clean it with a brush coated with white spirit, and then dry it with a piece of lint free cloth or blow dry with compressed air (be careful not to start the rotation of the bearing assembly).Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
Increase the rigidity of the bearing. Machine tool spindle bearing, bicycle and small agent bearing, gear differential.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
Adjust the size of the pad, gasket and bearing preload to make way.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported 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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.
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. Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.
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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
Internal factors mainly refer to structural design, manufacturing process and materials. There are three factors that determine the quality of bearings.
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. Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
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.Specified conditions for regular inspection of SKF imported bearings
Chat with us
Chat with us
Questions, doubts, issues? We're here to help you!
