SKF bearing corrosion control and elimination technology

SKF bearings use water-soluble cutting fluids, and users must work harder on machine maintenance and management to control the generation of corrosion and even eliminate corrosion. In order to prevent the water from corroding the metal surface, the machine tool should be fully lubricated and greased on important parts of the machine tool.
SKF bearings can have a long life under proper use. If damage occurs prematurely, it is most likely due to incorrect selection, improper use or poor lubrication.
Therefore, when installing the bearing, we need to record the type of machine, the installation location, the conditions of use and the surrounding fit. Through research to summarize the type of bearing damage, the use environment when the problem occurs, to avoid similar situations happen again.
Accurately control the concentration of the cutting fluid. When the machine is shut down, flush the surface of the machine with cutting fluid and open the machine cover to dissipate the humid air in the working area of ​​the machine. To prevent the occurrence of electrical corrosion, a layer of waterproof grease should be applied to the metal surface. Moreover, the machine tool should be grounded strictly. It is not enough to ground the electrical cabinet. To avoid the breeding and breeding of bacteria, the cutting fluid should be cleaned or replaced regularly, the chips should be removed in time, and soft water (pure water with low mineral content) should be used. Diluted the cutting concentrate.
In addition to excellent quality, imported bearings are also very precise parts. They are high-performance bearings. If they are used improperly during use, they will not achieve the expected performance results, and it is easy to damage the bearings. Already noted.
First, the use of installation should be carefully and carefully not allowed to force the stamping, it is not allowed to use vertical joints to knock the bearings, and the pressure is not allowed to pass through the rolling elements.
Second, use appropriate and accurate installation tools to use special tools as much as possible, and try to avoid the use of cloth and short fibers.
Third, try to keep the bearing and its surrounding environment clean. Even if the smiling dust that is invisible to the naked eye enters the bearing, it will increase the wear, vibration and noise of the bearing.
Fourth, to prevent the corrosion of the bearing When taking the bearing directly by hand, you should wash the liquid on your hand and apply it with high-quality mineral oil before handling. In the rainy season and summer, pay special attention to rust prevention. Under certain operating conditions, SKF bearings can achieve longer life than traditional calculations, especially at light loads. These special operating conditions are when the rolling surfaces (tracks and rolling elements) are effectively separated by a lubricant film and the surface damage caused by contaminants is limited. In fact, under ideal conditions, the so-called permanent bearing life is possible.

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TIMKEN bearing regular maintenance and noise reduction methods

When the TIMKEN bearing equipment is regularly inspected, operated, and the bearings removed during the replacement of the peripheral parts are stopped, it is necessary to determine whether the secondary bearing parts can be reused and the operation status is better or worse. In order to clarify and check the remaining amount of the visited lubricant, the bearing should be cleaned well after sampling.
a. The inner and outer rings, the rolling elements, and any one of the trusses are cracked and fragmented.
b. Any one of the inner and outer rings and the rolling elements are peeled off.
c. The raceway surface, the ribs, and the rolling elements have significant jamming.
d. The truss is severely worn or the rivets are loose and fierce.
e. The raceway surface, rolling elements are rusted and flawed.
f. There are significant indentations and marks on the rolling surface and the rolling elements.
g. There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.
h. Superheated and discolored.
i. Grease seal bearing seals and dust cover damage are serious.
When using TIMKEN bearings, sometimes we can hear the noise of the bearings. In fact, in theory, the bearings themselves will not produce noise, and the noise we hear is the direct or indirect bearing and surrounding structure. Vibration sound effect. So why does the bearing vibrate? Today, let me explain it briefly for everyone, please read it carefully!
When the number of loading rolling bodies changes, the excitation will occur. When a radial load is applied to an imported bearing, the number of rolling elements that carry the load will change during operation, which causes the load direction to shift. . The resulting vibration is unavoidable, but the current bearing vibration and noise seem to be reduced. Why? This is because the current TIMKEN bearings are designed to be preloaded to reduce and load on all rolling elements, reducing vibration and reducing noise. Although it is preloaded, it does not completely relieve vibration and noise. So how do you further reduce the noise?
1. Prevent excitation vibration between the excitation component and the resonance component.
2. Change the stiffness to achieve the purpose of changing the critical frequency.
3. Remove the critical excitation vibration.

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Medium pressure pump bearing temperature classification

Core Tip: As the temperature rises, for the 9FA combined cycle generator set, the heating problem of each device becomes very prominent. Therefore, it is necessary to strengthen the bearing temperature and motor of each device.
As the temperature rises, the heat generation problem of each device becomes more prominent for the 9FA combined cycle generator set.
Therefore, it is necessary to strengthen the monitoring of the bearing temperature and motor coil temperature of each equipment to ensure safe and economic operation of the unit under high temperature conditions.
    Based on this expectation, we especially strengthened the monitoring of the temperature and other parameters of various types of equipment during the operation of the unit. On April 12th, the duty officer noticed that the #2 machine A medium pressure pump pump free section bearing temperature was high (74 ° C), while strengthening the on-site inspection of the equipment. In the afternoon, it was found that the #2 machine A medium pressure pump pump free section bearing temperature increased abnormally, up to 97.1 ° C (jump pump value 100 ° C). Then contact the treatment, and at the same time enable the B standby medium pressure pump, and stop the A running medium pressure pump. On-site measured medium pressure to the pump bearing shell temperature is 90 ° C, while the bearing oil level is about 70%.
    It is precisely because of the expectation that the pump will be avoided due to the high bearing temperature caused by the medium pressure pump, and the harm caused by the abnormal operation of the medium pressure pump to the safe operation of the unit will be avoided.

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Bearing selection

Core Tip: Overview of Bearing Selection: The market requirements for various mechanical devices and instruments using rolling bearings are becoming more stringent, and the conditions and performance required for bearings are becoming increasingly diverse. In order to
Summary of bearing selection:


    The market requirements for various mechanical devices and instruments using rolling bearings are becoming increasingly stringent, and the conditions and performance required for bearings are becoming increasingly diverse. In order to be able to select the most suitable bearing from among a large number of structures and sizes, it is necessary to study from various angles. When selecting a bearing, generally considering the bearing arrangement as a shaft system, the ease of mounting and dismounting, the space allowed for the bearing, the size, and the marketability of the bearing, the bearing structure is roughly determined. Secondly, the bearing dimensions are determined while comparing the design life of various machines using bearings and the various endurance limits of the bearings. When selecting a bearing, it is often preferred to consider only the fatigue life of the bearing. The grease life, wear, noise, etc., which occur due to aging of the grease, also need to be fully studied. Furthermore, depending on the application, it is necessary to select a bearing that is specially designed for accuracy, clearance, cage structure, grease, and the like. However, there is no order or rule for selecting bearings. It is especially practical to consider the conditions, performance, and most relevant requirements for the bearings.


    ○The conditions and performance required for the bearing

    ○ Conditions of use, environmental conditions

    ○ Bearing installation part size items

    ○The space allowed by the bearing

    ○The size and direction of the load

    ○Vibration, shock

    ○Rotation speed, the limit speed of the bearing

    ○The inclination of the inner and outer rings

    ○Axial direction fixing and bearing arrangement

    ○Easy loading and unloading

    ○ noise, torque

    ○ Rigid

    ○Market and economy

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Causes and countermeasures of bearing surface grinding defects

Core Tip: During the grinding process, the working surface of the bearing is ground by a grinding wheel that rotates at a high speed. Therefore, if the machine is not operated and adjusted according to the operation instructions during grinding, it will be
During the grinding process, the working surface of the bearing is ground by a grinding wheel that rotates at a high speed. Therefore, if the equipment is not operated and adjusted according to the operation instructions during grinding, various defects will occur on the working surface of the bearing, thus affecting The overall quality of the bearing. When the bearing is in precision grinding, the roughening requirements are very high, and the grinding marks appearing on the working surface can be observed by the naked eye.

    The reason for the occurrence of such traces on the cross spiral traces is mainly due to the poor flatness of the grinding wheel and the unevenness. When grinding, the grinding wheel is only partially in contact with the workpiece. When the workpiece or the grinding wheel moves back and forth several times, The workpiece representation reproduces the cross spiral and is visible to the naked eye. The pitch of these spirals is related to the workpiece table speed and the workpiece rotation speed, and is also related to the grinding wheel axis and the table rail.

    (1) The main reason for the formation of spirals

    1. The grinding wheel is poorly trimmed, the corners are not chamfered, and the coolant is not used for trimming;

    2. The guide rail guides too much lubricating oil, causing the workbench to float;

    3. The machine tool accuracy is not good;

    4. Grinding pressure is too large.

    (2) The cause of the formation of the spiral

    1. The V-shaped guide rail is not rigid, and the grinding wheel is offset when grinding, but the edge of the grinding wheel is in contact with the working surface;

    2. When the quarrel is repaired, the commutation speed of the worktable is unstable, and the precision is not high, so that the edge of the grinding wheel is slightly trimmed;

    3. The workpiece itself is poorly rigid;

    4. There are crushed and spalled sand on the grinding wheel and iron scraps from the workpiece grinding on the surface of the grinding wheel. For this purpose, the finished grinding wheel should be rinsed or brushed with cooling water;

    5. The grinding wheel is not well trimmed, and there are partial bulges.

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Surface treatment of bearings with diamond coating reduces loss

Core Tip: Bearings are a universal part. Only a small number of equipments do not use bearing designs. In most cases, bearings are found in various types of instruments and equipment systems. Pick
Bearings are a universal part, and only a few equipments do not use bearing designs. In most cases, bearings are found in all types of instruments and equipment systems. Surface treatment of ball and plain bearings with a diamond-type coating can greatly reduce the frictional losses of the bearing system. In advance, this diamond-type coating can be applied to plastic bearings through a special coating process to improve the durability of components and extend the life of the equipment.

    Ball bearings are often seen in the transmission section of bicycles, while plain bearings can be found in the shaft of a ship. Bearings play a vital role in many drive and brake designs. They not only work well under high-speed engines and high-heat composite conditions, but also help materials meet the requirements of some extremely demanding working environments. Diamond-type coatings The emergence of the application is very good.

    Scientists from the IWM Materials Performance Research Center in Freiburg, Germany, are actively developing new generations of bearings for the next generation. They have developed a special high-performance chemical coating for the bearings to provide a smooth surface in the bearing. Degree, reduce friction, so as to achieve the design requirements to extend the purpose of bearing use. These innovative coating products, mainly composed of diamond-type carbon (DLC), said Dr. Sven Meier, head of the research center, "The emergence of diamond-based coatings has given us a strong technology for future bearing design. Support. We are fully capable of designing new products that last longer than conventional bearings. The bearing technology and applications for this new coating are still under development, and we envisage that this product can be used without lubricants. The situation can be done well."

    Of course, the surface treatment of diamond coatings on bearings also requires special coating processes, and IWM scientists have also completed the development of this process. Meier went on to say, “Our coating method can be used for surface treatment of complex geometric components such as bearing cages.” Engineers are currently optimizing this technology to achieve low-coat thickness performance. Application requirements, it is reported that IWM plans to control the coating thickness below 20 microns. “Our process ensures the coating service requirements for micron-sized coating structures. At this size, the coating can completely replace traditional lubricants or lubricants to minimize system friction. Special requirements can also create super smooth material surfaces."

    Currently, researchers are further developing coating coating processes to ensure they meet the specific requirements of different sizes and shapes. IWM's goal is to reduce the high cost of existing bearing processing by optimizing the process, thereby reducing the cost of enterprise equipment procurement and equipment maintenance.

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The importance of koyo self-aligning ball bearing lubrication for rolling sound

Lubrication and sealing are very important for any self-aligning ball bearing. Good lubrication and sealing are the guarantee of bearing life. Today we will focus on the importance of lubrication and sealing of koyo bearings.
In daily use, many people do not pay attention to the lubrication of self-aligning ball bearings. They believe that lubrication has little effect on the bearings. However, this often leads to a reduction in the life of the bearing. What is the benefit of the lubrication of the koyo bearing?
a. Oil bath lubricating oil bath lubrication is the most common lubrication method, suitable for lubrication of low and medium speed bearings. A part of the self-aligning ball bearing is immersed in the groove, and the lubricating oil is brought up by the rotating bearing parts, and then flows back. The oil level of the oil sump should be slightly lower than the center of the lowest rolling element.
b. Drip oil lubrication Drip oil lubrication is suitable for bearing parts that need to supply lubricating oil quantitatively. The amount of oil dripping is generally one drop every 3-8 seconds. Excessive oil quantity will cause the temperature of koyo bearing to increase.
c. Circulating oil lubrication The oil pump is used to transport the filtered oil to the self-aligning ball bearing parts, and then filtered and cooled by the lubricating oil after the bearing. Since the circulating oil can take away a certain amount of heat and cool the koyo bearing, this method is suitable for bearing parts with a higher rotational speed.
d. Spray lubrication Dry air is mixed with lubricating oil through a sprayer to form an oil mist. In the jet bearing, the air flow can effectively cool the bearing and prevent the intrusion of impurities. This method is suitable for the lubrication of high speed, high temperature self-aligning ball bearing components.
e. Injection lubrication The high-pressure oil is injected into the bearing through the nozzle by the oil pump, and the oil injected into the koyo bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at high speed, the rolling elements and the cage also form a gas flow at the relatively high rotation speed of the surrounding air. It is difficult to send the lubricating oil to the bearing by the general lubrication method. At this time, the lubricating oil must be sprayed by the high-pressure injection method. In self-aligning ball bearings, the position of the nozzle should be between the inner ring and the center of the cage.
Since the temperature is affected by lubrication, speed, load, and environment, the values ​​in the table only indicate the approximate temperature range. Lubrication of bearing lubrication has an important influence on the fatigue life of koyo bearings and friction, wear, temperature rise, vibration, etc. Without normal lubrication, self-aligning ball bearings cannot work. Analysis of the cause of bearing damage indicates that about 40% of bearing damage is associated with poor lubrication. Therefore, good lubrication of the bearings is an effective measure to reduce bearing friction and wear.

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The important role of SKF non-standard bearing lubrication in the elimination of the guide

In general, non-standard bearings heat up after they start running, and after a period of time, they are at a lower temperature (usually 10 to 40 degrees higher than room temperature). The normal time is different depending on the size, form, rotation speed, lubrication method of the SKF bearing, and the exothermic conditions around the non-standard bearing. It takes about 20 minutes to several hours.
When the temperature of the non-standard bearing does not reach the normal state and the abnormal temperature rises, the following reasons may be considered. In addition, the machine should be stopped as soon as possible and necessary countermeasures should be taken. Temperature is essential for maintaining the proper life of non-standard bearings and preventing deterioration of lubricating oil. It is recommended to use as much as possible under non-high temperature conditions (generally below 100 degrees). The main cause of abnormal temperature rise is too much or too little. Poor installation of SKF bearings. The internal clearance of non-standard bearings is too small, or the load is too large. The friction of the seal is too large. The lubricant does not match. The creep of the mating surface.
1. Firstly, the parts of the SKF bearing are lubricated to reduce the friction and wear of the bearing;
2. The rolling contact surface of the bearing often forms an appropriate oil film to prolong the fatigue life of the non-standard bearing;
3. The heat generated by friction or other reasons inside the bearing is removed by lubrication;
4. Through lubrication, it can achieve anti-rust and dust-proof effects on non-standard bearings.
Therefore, we must correctly understand the importance of lubrication for SKF bearings, improve bearing performance and reduce consumption.

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The main influence of the correct use of grease on the speed of INA forklift bearings

Proper use of grease must be aware of the movement of the grease in the forklift bearings. Guarantee the stability of the grease. The movement of the grease filled in the INA bearing can be roughly divided into two stages as the bearing rotates.
In general, the amount of grease filled in the bearing always exceeds the actual amount of lubrication directly involved in the lubrication, on the frame and in the cavity of the bearing cover, and forms a contour on the periphery of the rolling element. During this process, the bearing temperature rises rapidly due to the resistance of the excess grease. Although most of the excess grease is squeezed out at the beginning of the run, the grease that is squeezed into the raceway attachment may still be carried by the rolling element into the raceway. In the initial stage of bearing operation, most of the grease is squeezed out of the raceway very quickly (less than one minute), and the accumulated grease is discharged a small amount while circulating with the forklift bearing. At this time, the INA bearing temperature continues to rise until the excess grease is completely discharged, which can be called the grease's walking phase. According to the grease quality and filling amount in the bearing structure, this time may last for more than ten. Minutes, even hours.
The achievable speed of a precision bearing depends mainly on the bearing type, structure, material, type and size of the load, lubricant and lubrication. Operating temperature is an additional limitation in terms of allowable speed.
INA bearing configurations operating at high speeds require lower friction and heat for forklift bearings, and precision bearings and bearings are best suited for these applications.
Compared to other high-precision bearing types, INA bearings are able to achieve the highest speeds. The relative speed performance of bearings in different series of bearings is compared.
Precision bearings can achieve the same speed as the 70CD series bearings. Forklift bearings cannot reach the same high speed as radial bearings.

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How to maintain the dynamic load capacity of INA automotive bearings

Commonly used installation tools for bearings include hand hammers, copper rods, sleeves, special pads, screw-mosquito fixtures, presses, etc., with vernier calipers, micrometers, dial gauges, etc., but different tools should be selected according to different car bearing models. . After selecting the correct tool, the INA bearing can be installed. Pay attention to the presence of no bumps, rust layer, wear debris, sand, dust and dirt. If it is, it will cause installation difficulties and must be maintained. The surface of the bearing assembly and the mating parts are clean.
The calculation method for the basic rated load of INA bearing is suitable for the high-quality hardened steel commonly used by Dangdang, which is manufactured according to a good processing method, and the rolling contact surface is basically a conventionally designed rolling bearing. Beyond the above specified range, bearing load capacity will be affected. Influence of material The bearing steel has different smelting methods, and the size, enactment and content of inclusions in the material are also different. This difference in village quality can have a beneficial or adverse effect on the bearing capacity of the bearing. If ordinary electric furnace bearing steel is used, the load capacity of the bearing will drop to varying degrees. On the contrary, if the bearing steel smelted by methods such as vacuum remelting, electroslag remelting, etc., or other equivalent materials, the load capacity of the automotive bearing will be improved to varying degrees. The effect of temperature The average bearing can withstand an operating temperature of up to 120 ° C (outer ring measurement temperature of 100 ° C). For working conditions above this limited temperature, bearings made with special heat treatment or special materials shall be used.
In addition to the INA bearing assembly surface and the matching surface of the parts to be cleaned, pay attention to the surface of the journal, the housing hole, the shoulder end face, and the connecting parts such as bushings, washers, end caps, etc. ? If you have any, you can use a fine smash, light sanding, and then install. Rolling bearings are precision components and their use must be carried out with care. No matter how high-performance bearings are used, if not used properly, the expected high performance will not be achieved. The precautions for the use of automotive bearings are as follows:
1, use the appropriate operating tools
    Avoid using existing tools and use the right tools.
2, keep the bearings and their surroundings clean
    Even small dust that is invisible to the eyes can have a bad effect on the bearings. Therefore, keep the area clean so that the dust does not intrude into the bearing.
3. Use with caution
    In the use of the INA bearing strong impact, it will produce scars and indentations, which is the cause of the accident. In severe cases, cracks and breaks occur, so care must be taken.

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