Standard method and lubrication maintenance for installing NSK rolling bearings

Since the rolling bearings are rust-proofed and packaged, do not open the package until installation.

In addition, the anti-rust oil coated on the bearing has good lubricity. For general-purpose NSK bearings or grease-filled bearings, it can be used without cleaning. However, for instrument bearings or bearings for high-speed rotation, the cleaning oil should be washed with a clean cleaning oil. The bearing is prone to rust and cannot be placed for a long time.

Clean the bearing and the casing to confirm the burrs left by scratches or machining. There must be no abrasive (SiC, Al2O3, etc.) sand or chips in the outer casing.

Secondly, check whether the size, shape and processing quality of the shaft and the casing are in accordance with the drawings.

The method of installing the rolling bearing depends on the fit, condition and structure of the NSK bearing. Generally, since the shaft is mostly rotated, the inner ring needs an interference fit. Cylindrical bore bearings, press with multiple presses, or use hot charging methods. For taper holes, mount directly on the taper shaft or with a sleeve.

When installed in the outer casing, the general clearance fits a lot, and the outer ring has an interference amount, which is usually pressed by a press or a cold shrink fit method after cooling. When dry ice is used as the coolant and the shrinkage is installed, the moisture in the air will condense on the surface of the bearing. Therefore, appropriate rust prevention measures are required.

Mounting bearing: Whether the rolling bearing is installed accurately, affecting accuracy, life and function. Therefore, the bearing installation plan and the disassembly part are enriched. I hope I can install it according to my homework. The names of the homework scales are as follows:

(1) Clearing and bearing related components;

(2) Check the size and packing components related to the case;

(3) installation;

(4) Checking after bearing installation;

(5) A smoothing agent supplied.

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Judging the fault maintenance method of SKF self-aligning ball bearing in use

SKF bearings exhibit a strong regularity during their use and are very repeatable. Normal high-quality bearings (SKF bearings) have relatively small vibration and noise at the beginning of use, but the spectrum is somewhat scattered and the amplitude is small, which may be due to some defects in the manufacturing process, such as surface burrs.

After a period of motion, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency. There are very few spectrums above the power frequency, and the state of the self-aligning ball bearings is very stable and enters a stable working period.

After continuing to run, the vibration and noise of SKF bearings begin to increase, and sometimes abnormal sounds appear, but the change of vibration increases slowly. At this time, the bearing kurtness value suddenly reaches a certain value. We believe that SKF bearings are initially faulty at this time.

At this time, it is required to closely monitor the SKF bearing and pay close attention to its changes. After that, the bearing kurtosis value begins to drop rapidly and approaches the normal value, while the vibration and noise begin to increase significantly, and the increase rate begins to accelerate. When the vibration exceeds the vibration standard (such as ISO2372 standard), the bearing kurtosis value also begins. Rapid increase, when both exceed the vibration standard, and the kurtosis value also exceeds the normal value (the available kurtosis is relative to the standard), we believe that the self-aligning ball bearing has entered the late fault production, and it is necessary to repair the equipment in time and replace the SKF bearing.

SKF bearings exhibit late failure characteristics to serious failures (generally bearing damage such as axles, burns, sand cracks, raceways, bead wear, etc.) are not more than one week. The larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual fault diagnosis of self-aligning ball bearings, once the late fault characteristics are found, the bearing should be judged decisively and the maintenance should be arranged as soon as possible.

The use factors mainly refer to whether the installation adjustment, use and maintenance, maintenance and repair, etc. meet the technical requirements. According to the technical requirements of SKF bearing installation, use, maintenance and maintenance, monitor and check the load, speed, working temperature, vibration, noise and lubrication conditions of the SKF bearing in operation, find the cause and immediately adjust the cause. Make it back to normal.

First of all, when the spindle bearing in the spindle is in operation, it is necessary to fully ensure the lubrication, and the lubricant is periodically added according to the actual use condition, and the oil cannot be cut off for a long time. Therefore, for the user company, a better and more suitable spindle lubricant should be used. The new special spindle oil can significantly improve the lubrication performance, extend the oil change interval, extend the service life of the spindle and the self-aligning ball bearing, and also has better anti-rust and anti-corrosion properties.

Secondly, the bearing with reinforced nylon material cage should be used at a temperature lower than 120 °C.

In addition, care should be taken when cleaning and cleaning the spindle to prevent damage and scratching the surface of the roller. To remove the residue of the SKF bearing part as much as possible, it is better to rinse and suck the inside of the ingot to clean the residual oil. Care should be taken to avoid the use of the dumping type to cause the accumulation of cleaning waste to remain in the bearing parts, resulting in problems such as noise and wear failure of the self-aligning ball bearings.

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IKO cam bearing lubrication technique to solve the raceway noise analysis

The source of the rolling sound is caused by the natural vibration of the ferrule after the load. Due to the elastic contact of the ferrule and the rolling body, a nonlinear vibration system is formed. When the lubrication or machining accuracy is not high, the natural vibration associated with this elastic characteristic is excited, and when it is transmitted to the air, it becomes noise. It is well known that even if IKO bearing parts are processed using the most advanced manufacturing techniques in the world, there will always be small geometric errors in the working surface, which will cause small fluctuations between the raceway and the rolling elements to excite the natural vibration of the vibration system.

First, the bearing drip lubrication method

Drip lubrication is suitable for bearing parts that need to be supplied quantitatively to the lubricating oil. It is advisable to drop a single drop every 3-8 seconds. Excessive oil quantity will cause the bearing temperature to increase.

Second, the oil bath lubrication method of cam bearings

Oil bath lubrication is the common lubrication method in most cam bearings and is suitable for lubrication of low and medium speed IKO bearings. A part of the bearing is immersed in the groove, the lubricating oil is brought up by the rotating bearing part, and then flows back to the oil groove oil surface should be slightly lower than the center of the lowest rolling element.

Third, the radiation lubrication of the bearing

    The low pressure oil is injected into the bearing through the nozzle by the oil pump, and the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at high speed, the rolling element and the cage also cause the surrounding air to flow at a relatively high rotational speed. It is difficult to send the lubricating oil to the bearing in a smooth manner. In this case, it is necessary to spray the smooth oil with low-pressure radiation. In the bearing, the position of the nozzle should be placed between the inner ring and the center of the cage.

Fourth, the bearing lubrication method

   The oil is pumped to the cam bearing component by an oil pump, and then filtered and cooled by the lubricating oil after the bearing. Because the circulating oil can take away a certain amount of heat and cool the IKO bearing, this method is used for bearing parts with higher rotational speed.

Five, bearing spray lubrication method

   The use of boring shrinking air is mixed with smooth oil through a sprayer to create an oil mist. In the radial bearing, the air flow can effectively cool the bearing and prevent the intrusion of impurities. This method is suitable for the smoothness of high speed and low temperature bearing components.

Although the bearing raceway noise is unavoidable, it is possible to use high-precision machining of the working surface of the part, the correct selection of the bearing and the precise use of the bearing to reduce noise and vibration.

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Reasons and maintenance methods affecting the service life of IKO self-aligning ball bearings

First of all, the bearing size is limited.

Self-aligning ball bearings usually have limited installation space. In most cases, it is based on mechanical design or other design limitations. The type and size of the IKO bearing is therefore based on the decision to choose the bearing diameter. Therefore, the main dimension tables of standard self-aligning ball bearings are sized according to international standards.

In many forms of standard bearing sizes, it is best to use standard self-aligning ball bearings in mechanical equipment design, size, and direction are constantly changing. Normally, the basic load rating is shown in the size of the table. However, axial load and radial load can also be an important factor in selecting an appropriate self-aligning ball bearing. IKO bearings usually have a high load capacity and are subject to large vibration and shock loads when the size is quite long.

Second, the speed of the bearing.

The allowable speed is determined based on factors such as the type, size, accuracy, cage, load, lubrication, and cooling method of the self-aligning ball bearing. The IKO bearing table lists the speeds allowed for the standard accuracy of lubricating oil bearings and grease. In general, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high speed applications.

Third, self-aligning ball bearing tolerances.

Self-aligning ball bearings are dimensionally accurate and rotationally accurate based on the International Organization for Standardization (ISO) and JIS standards. High precision, high speed machinery, recommended for five years or more accurate self-aligning ball bearings, deep groove ball bearings, angular contact ball bearings or cylindrical roller bearings for high machine running accuracy. Rigid, elastically deformed when the contact pressure of the ball and roller races is adjusted. Some machines require less elastic deformation. There is a small elastic deformation than a ball bearing roller bearing.

Maintenance of IKO bearings must also master the following:

1. Regularly check the use status, pay attention to whether there is abnormal sound and partial sharp temperature rise in the observation part;

2. Regularly or quantitatively add lubricating oil or grease as required;

3, according to the use of the vehicle, at least once every six months to completely replace the lubricant, and carefully check;

4. Inspection method under maintenance condition: clean the kerosene or gasoline under disassembly, carefully observe whether there is sliding or creeping phenomenon on the inner and outer cylindrical surfaces, whether there are flaking or pitting on the inner and outer raceway surfaces, whether the rolling elements and cages are Wear and deformation, etc., based on the comprehensive situation of IKO bearing inspection, to determine whether it can continue to use.

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NTN thrust ball bearing grease selection needs to pay attention to six factors

The choice of NTN thrust ball bearing grease is directly related to the stable operation of the equipment. In order to better play the best condition of NTN thrust ball bearing, the following are several important factors for selecting grease: mechanical type; NTN thrust ball bearing Type and size; working temperature; workload situation; speed range; working conditions, such as vibration and the direction of the main shaft is horizontal or vertical; cooling; sealing effect;

1, anti-rust performance

The grease used in NTN thrust ball bearings must have an anti-rust effect, and the anti-rust agent should preferably be insoluble in water. Grease should have good adhesion and form an oil film on the surface of the steel.

2, mechanical stability

Grease becomes soft during machining and causes leakage. During normal operation, the grease will be raked into the NTN thrust ball bearing by the NTN thrust ball bearing housing. If the mechanical stability of the grease is insufficient, during the operation, the structure of the soap of the grease will mechanically disintegrate, causing the grease to be destroyed, thereby losing the lubricating effect.

3, oil seal

Oil seal is a necessary barrier to protect NTN thrust ball bearings and lubricants from external contamination. During the operation of NTN thrust ball bearings, no matter whether debris or moisture can penetrate into NTN thrust ball bearings to prevent damage. Proper installation and maintenance is an important factor in maximizing the service life of NTN thrust ball bearings. At the same time, attention must be paid to the cleanliness of NTN thrust ball bearings, the correctness of NTN thrust ball bearing selection, and the selection of appropriate installation and maintenance tools. In addition, NTN thrust ball bearings must be protected from contaminants and moisture and ensure proper installation and lubrication. Therefore, the design of the NTN thrust ball bearing, the condition of the oil seal, the type of lubricant and the lubrication cycle, and even the special maintenance play the same and important role.

4, mixed grease

Never mix incompatible greases. If two incompatible greases are mixed, the consistency will usually become soft. Finally, the NTN thrust ball bearings may be damaged due to the easy loss of grease. If you don't know which type of grease was originally used in NTN thrust ball bearings, you must completely remove the old grease inside and outside the NTN thrust ball bearings before adding new grease.

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Correct use of TIMKEN cylindrical roller bearing grease

Proper use of grease must be aware of the movement of grease in TIMKEN cylindrical roller bearings. Guarantee the stability of the grease. The movement of the grease filled in the rolling bearing can be roughly divided into two stages with the rotation of the TIMKEN cylindrical roller bearing.

In general, the amount of grease in the TIMKEN cylindrical roller 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 grease is accumulated in a small amount while being circulated with the TIMKEN cylindrical roller bearing rotating body. discharge. At this time, the bearing temperature will continue to rise until the excess grease is completely discharged. It 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 ten minutes. Even a few hours.

After the remaining grease is completely discharged, the remaining small amount of grease forms a thin layer of grease film on the mutual contact surface of the rolling element, the raceway and the cage, thereby entering the normal operation stage of the bearing. . At this time, the temperature gradually drops and reaches equilibrium. In other words, long-term lubrication is mainly borne by this layer of grease film. In addition, during the long-term operation of the bearing, the contour of the rolling element and the raceway and the grease on the cage are shrunk to separate a part of the base oil, and after flowing into the raceway, the lubrication is also supplemented. .

Different greases are different in the contours of TIMKEN cylindrical roller bearings. It is necessary to form a contour that is relatively straightforward. The running time is short. In the long-term operation, the bearing temperature is low and stable. This is a kind of It is an ideal grease, so it is especially important for the grease.

Some so-called eddy-flow greases are not easy to form contours, and even if they are contoured, they are easy to collapse. At this time, the excess grease repeatedly returned to the raceway is in a state of being strongly stirred for a long time, and the torque of the TIMKEN cylindrical roller bearing is large. The temperature is high and unbalanced, and noise may also be generated, and the grease is also prone to deterioration and loss.

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Correctly judge the running rules and faults of rolling bearings

Rolling bearings exhibit strong regularity during their use and are very repeatable. Normal high-quality bearings (rolling bearings) have relatively small vibration and noise at the beginning of use, but the spectrum is somewhat scattered and the amplitude is small, which may be due to some defects in the manufacturing process, such as surface burrs.

After a period of motion, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency. There are very few spectrums above the power frequency, and the bearing status is very stable and enters a stable working period.

After continuing to run, the vibration and noise of the rolling bearing begin to increase, and sometimes abnormal sounds appear, but the change of vibration increases slowly. At this time, the bearing kurtness value suddenly reaches a certain value. We believe that the rolling bearing is an initial failure at this time.

At this time, it is required to closely monitor the rolling bearing and pay close attention to the change. After that, the bearing kurtosis value begins to drop rapidly and approaches the normal value, while the vibration and noise begin to increase significantly, and the increase rate begins to accelerate. When the vibration exceeds the vibration standard (such as ISO2372 standard), the bearing kurtosis value also begins. Rapid increase, when both the vibration standard is exceeded, and the kurtosis value also exceeds the normal value (the available kurtosis is relative to the standard), we believe that the bearing has entered the late fault production, and it is necessary to repair the equipment in time and replace the rolling bearing.

Rolling bearings show late fault characteristics to serious faults (generally bearing damage such as axles, burns, sand cracks, raceways, bead wear, etc.) are not more than one week. The larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual rolling bearing fault diagnosis, once the late fault characteristics are found, the bearing should be judged decisively and the maintenance should be arranged as soon as possible.

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