Analysis on characteristics and common problems of SKF imported bearings
There are many reasons for the noise of rolling bearings. One is the wear of the mating surfaces of the inner and outer rings of bearings. In addition, insufficient bearing lubrication, dry friction and bearing breakage will produce abnormal sound. From the two aspects of use reasons and internal factors, we can see the reasons for the effectiveness of Koyo bearing. The use factors mainly depend on whether our use method is reasonable. The internal factors are actually the level problem when we choose Koyo bearing!!Analysis on characteristics and common problems of SKF imported bearings
Use factors mainly refer to whether the installation, adjustment, use and maintenance, maintenance and repair meet the technical requirements. The installation condition is one of the primary factors in the use factors. The improper installation of Koyo bearing often leads to the change of the stress state between the parts of the whole set of bearing, and the bearing operates in an abnormal state and fails early. Analysis on characteristics and common problems of SKF imported bearings
According to the technical requirements of Koyo bearing installation, use, maintenance and repair, monitor and inspect the load, speed, working temperature, vibration, noise and lubrication conditions of the running bearing, find out the causes immediately and adjust them to make them return to normal. In addition, it is also important to analyze and test the quality of grease and the surrounding medium and atmosphere.Analysis on characteristics and common problems of SKF imported bearings
Internal factors mainly refer to the three factors that determine the quality of Koyo bearings, such as structural design, manufacturing process and material quality. First of all, the reasonable design and advanced nature of the structure will lead to longer bearing life. The manufacturing of bearings generally goes through multiple processing processes such as forging, heat treatment, turning, grinding and assembly.Analysis on characteristics and common problems of SKF imported bearings
The rationality, advanced nature and stability of all the processing technologies will also affect the life of bearings. Among them, the heat treatment and grinding processes that affect the quality of finished bearings are often more directly related to the failure of bearings. In recent years, the research on the metamorphic layer on the working surface of bearing shows that the grinding process is closely related to the surface quality of bearing.
Analysis on characteristics and common problems of SKF imported bearings
In severe cases, metal peeling and large-area random scratches occur on the contact surface; In general, the mechanical damage of Koyo imported bearing refers to the appearance of groove marks at different levels on the alloy surface of bearing bush. Contact surface damage and ablation exist at the same time. The main reason for bearing mechanical damage is that the bearing surface is difficult to form oil film or the oil film is seriously damaged.Analysis on characteristics and common problems of SKF imported bearings
Plastic deformation and cold work hardening occur on the outer surface layer, and Koyo imported bearing is under the repeated action of cylinder pressure (impact load). The deformation capacity is lost locally, and the grain is gradually formed and continuously expanded. Then, with the falling off of wear debris, the loaded outer layer forms a hole. Generally, when the bearing bush is pitted, the pit first appears, and then the pit gradually expands and causes the cracking of the alloy layer interface. The crack extends along the parallel direction of the interface until it peels off.Analysis on characteristics and common problems of SKF imported bearings
The main reason for bearing cavitation is that the sudden change of the cross section of structural elements such as oil groove and oil hole causes strong disorder of oil flow. Bubbles are formed in the vacuum area with disorder of oil flow, and then cavitation occurs due to the collapse of bubbles due to the increase of pressure. Cavitation usually occurs in the high load area of the bearing, such as the lower bearing bush of the crankshaft main bearing.Analysis on characteristics and common problems of SKF imported bearings
Due to the overload of the engine, the fatigue pitting corrosion of Koyo imported bearings refers to.
Make the bearing overheat and the bearing clearance is too large, resulting in fatigue damage, fatigue pitting or fatigue falling off in the middle of the bearing. This kind of damage is mostly caused by overload, excessive bearing clearance, or unclean lubricating oil and foreign matters mixed in it. Therefore, when using, attention should be paid to prevent the bearing from overload and do not run at too low or too high speed; Adjust the engine to a stable state at idle speed; Ensure the normal bearing clearance and prevent the engine speed from being too high or too low; Check and adjust the working condition of the cooling system to ensure that the working temperature of the engine is appropriate.Analysis on characteristics and common problems of SKF imported bearings
The chemical impurities (acid oxides, etc.) in the lubricating oil oxidize the bearing alloy to form acidic substances. The corrosion area of the bearing alloy is generally impure lubricating oil. Cause the bearing alloy to fall off locally and form irregular small cracks or pits. The main causes of bearing alloy corrosion are improper selection of lubricating oil, poor corrosion resistance of bearing data, or rough engine operation and high temperature.Analysis on characteristics and common problems of SKF imported bearings
Local high temperature is formed, and there is a small convex metal surface in direct contact between the journal and the friction pair of Koyo bearing. In case of lack of lubrication and poor cooling, the bearing alloy will be blackened or partially burned. This fault is often caused by too tight fit between journal and bearing; Lack of lubricating oil pressure is also easy to burn the bearing. Analysis on characteristics and common problems of SKF imported bearings
From the two aspects of use reasons and internal factors, we can see the reasons for the effectiveness of Koyo bearing. The use factors mainly depend on whether our use method is reasonable. The internal factors are actually the level problem when we choose Koyo bearing!!
Use factors mainly refer to whether the installation, adjustment, use and maintenance, maintenance and repair meet the technical requirements. The installation condition is one of the primary factors in the use factors. The improper installation of Koyo bearing often leads to the change of the stress state between the parts of the whole set of bearing, and the bearing operates in an abnormal state and fails early. Analysis on characteristics and common problems of SKF imported bearings
According to the technical requirements of Koyo bearing installation, use, maintenance and repair, monitor and inspect the load, speed, working temperature, vibration, noise and lubrication conditions of the running bearing, find out the causes immediately and adjust them to make them return to normal. In addition, it is also important to analyze and test the quality of grease and the surrounding medium and atmosphere.Analysis on characteristics and common problems of SKF imported bearings
Internal factors mainly refer to the three factors that determine the quality of Koyo bearings, such as structural design, manufacturing process and material quality. First of all, the reasonable design and advanced nature of the structure will lead to longer bearing life. The manufacturing of bearings generally goes through multiple processing processes such as forging, heat treatment, turning, grinding and assembly. Analysis on characteristics and common problems of SKF imported bearings
The rationality, advanced nature and stability of all the processing technologies will also affect the life of bearings.
Among them, the heat treatment and grinding processes that affect the quality of finished bearings are often more directly related to the failure of bearings. In recent years, the research on the metamorphic layer on the working surface of bearing shows that the grinding process is closely related to the surface quality of bearing. Firstly, SKF adopts its own refined bearing steel to ensure product quality in terms of hardness and accuracy.Analysis on characteristics and common problems of SKF imported bearings
The outer packaging design and color blocks of genuine bearings are very clear, and the steel seal of genuine SKF bearings, which is often referred to as the prefix, is very clear.Analysis on characteristics and common problems of SKF imported bearings
When rotating SKF Bearing, it should be very smooth without abnormal noise and impurities. SKF Bearing is allowed to make slight running noise during operation. If the noise is too loud or there is abnormal noise or impact sound, it indicates that the bearing is faulty. SKF Bearing antirust treatment adopts antirust oil with slight fragrance, and the amount is small. Make the whole bearing clean and fragrant.Analysis on characteristics and common problems of SKF imported bearings
SKF Bearing has fine chamfer and black edge at the junction of transverse and vertical surfaces.Analysis on characteristics and common problems of SKF imported bearings
During the normal use of SKF Bearing, the part where the bearing is installed is allowed to have a certain temperature. When touching the mechanism shell by hand, it is normal to feel that it is not hot.Analysis on characteristics and common problems of SKF imported bearings
If the temperature of SKF Bearing is too high during use, factors such as whether the quality of lubricating oil meets the requirements or deteriorates, high viscosity of lubricating oil and so on can be considered; Or the installation mechanism is assembled too tightly and the bearing is assembled too tightly; Broken bearing cage or rolling element, etc.Analysis on characteristics and common problems of SKF imported bearings
SKF imported bearings
If the ina bearing assembly surface and the matched part surface have bumps, rust layers, wear debris, sand particles, dust and soil, one is that the bearing installation is difficult, resulting in the incorrect assembly position; Second, these attachments form abrasives and are easy to wear the working surface of the bearing, affecting the assembly quality. Analysis on characteristics and common problems of SKF imported bearings
Therefore, before installation, carefully inspect the surface of journal, bearing housing hole, shoulder end face and the mating surface of connecting parts such as bushing, washer and end cover. If there is any rust layer, file it off with a fine file and polish it with a fine abrasive cloth. At the same time, remove the attachments on the bearing assembly surface and its connecting parts.Analysis on characteristics and common problems of SKF imported bearings
Use of INA Bearing
Precautions for use: rolling bearing is a precision component, and its use must be carried out with corresponding caution. No matter how high-performance bearings are used, if they are not used properly, the expected high performance will not be obtained. Precautions for the use of bearings are as follows:Analysis on characteristics and common problems of SKF imported bearings
Keep the bearing and its surroundings clean. Even small dust that cannot be seen by the eyes will affect the bearing. Therefore, keep the surrounding clean so that the dust will not invade the bearing.Analysis on characteristics and common problems of SKF imported bearings
Use with care. Strong impact on the bearing during use will produce scars and indentation, which will become the cause of the accident. In serious cases, it will crack and fracture, so we must pay attention to it.
Use appropriate operating tools. Avoid replacing with existing tools, and appropriate tools must be used. Such as special sleeve, press, etc.Analysis on characteristics and common problems of SKF imported bearings
Pay attention to the corrosion of the bearing. When operating the bearing, the sweat on the hand will become the cause of rust. Pay attention to operate with clean hands and try to wear gloves.Analysis on characteristics and common problems of SKF imported bearings
Common problems of SKF imported bearings
When considering the load factor, it should be noted that the service life of the bearing is more sensitive to the load than the speed. Therefore, for the multi-stage transmission shaft, if possible, the larger deceleration should be placed in the later stage;Analysis on characteristics and common problems of SKF imported bearings
For the main shaft bearing, if possible, properly adjust the distance between the external load action point and the INA Bearing fulcrum, strive to reduce the load of the main shaft INA Bearing, and strive to ensure that the load transmitted to the main shaft ina bearing is stable and avoid impact and vibration. This requires that the shape and position accuracy of the bearing installation part is high enough, the clearance and fit of the ina bearing are selected correctly, and the installation accuracy of the ina bearing is good.Analysis on characteristics and common problems of SKF imported bearings
The more the calculated load of INA Bearing selected in the type selection design can represent the actual load of bearing during operation, the more correct the calculation result is. Therefore, it is necessary to study the actual load of INA Bearing extensively and deeply.Analysis on characteristics and common problems of SKF imported bearings
If ina bearing not only bears a large load, but also stands still without rotation, this state is more unfavorable. A small indentation will be formed between the rolling element and the raceway and will soon develop into pitting corrosion, resulting in early failure of the bearing. In this case, it is necessary to verify whether the rated static load of the selected ina bearing can exceed the equivalent static load of the INA Bearing.Analysis on characteristics and common problems of SKF imported bearings
The other extreme case is just the opposite. INA Bearing operates at high speed, but does not bear load. In this way, the rolling element often slides on the raceway without rolling, resulting in the rapid rise of INA Bearing Temperature, the decomposition and deterioration of lubricant, and the INA Bearing will also fail quickly. Therefore, INA Bearing needs a small load to prevent slipping.Analysis on characteristics and common problems of SKF imported bearings
In many cases, the actual load of INA Bearing increases significantly due to the influence of vibration. When the coaxiality error of ina bearing is large (misalignment), the actual load of INA Bearing will also increase. Therefore, the value of calculated load must be corrected.Analysis on characteristics and common problems of SKF imported bearings
In some cases, the axial force and radial force generated by the equipment itself, the weight of parts such as gears and even the weight of the shaft, and the stress of relevant parts must also be considered. They are all calculated in the afterload and load borne by the bearing, which are often easy to be ignored and omitted. The following table lists the main analysis items: analysis item selection method.Analysis on characteristics and common problems of SKF imported bearings
For the type of bearing whose rigidity can meet the rigidity required by the mechanical shaft system, in the machine tool spindle and automobile final reducer, while improving the rigidity of the shaft, we must also improve the rigidity of the bearing. The deformation of roller bearing under load is smaller than that of ball bearing. Applying preload (negative clearance) to the bearing can improve the rigidity. This method is suitable for angular contact ball bearings and tapered roller bearings.Analysis on characteristics and common problems of SKF imported bearings
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