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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FAG imported bearings anti-friction bearing maintenance and lubrication

Proper lubrication of anti-friction bearings in FAG bearings is critical to their successful operation. For ordinary or sleeve type bearings, there are different principles in different practices. In order for the party to maintain anti-friction bearings, these principles must be understood and applied.

After fully understanding these principles, you should have a key consideration. We quote from FAG Bearing Industries' "Guidelines for Improving Bearing Lubrication": "...the characteristics of the lubricant, especially the characteristics of the grease, cannot be determined solely on the basis of specifications." Specifications are only physically applicable to a product, and may include chemical descriptions. Practicality can best explain the problem, but the specifications are almost not related to the practical.

The anti-friction bearings in all FAG bearings basically contain two hardened steel rings, a plurality of hardened balls or rollers, and a separator or cage that separates the rollers or rollers. These types are divided into many categories in use. Some types, such as needle-like column bearings, may have no inner ring and the rollers move directly on the hardened shaft.

Types of anti-friction bearings in FAG bearings:

Anti-friction bearings are divided into two main types. They are ball bearings and roller bearings. At the same time, we also know that due to the different uses of the manufacturer and the bearing, many different types have evolved according to these basic structures.

Lubrication function:

Anti-friction lubricants have the following main functions

1. Lubricate the sliding contact between the retainer and the rest of the bearing.

2. Lubricate any contacts between the race and the roller that is not actually rolling.

3. Lubricate the sliding contact between the roller and the guide in the roller bearing.

4. Lubricate all the truly rolling contacts in the bearing.

5. Protect highly delicate surfaces from corrosion.

6. Assist the sealing cover to protect against foreign matter. Grease has a magnetic function.

7. Provide a means of conducting heat (cold).

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Lubrication of high temperature and high speed NSK bearings

The high-temperature thickener thickens the synthetic oil and adds multi-effect additives, which is a high-quality grease that maintains normal working conditions in a high temperature environment for a long time.

A high temperature tolerance and high-speed shear resistance make it comfortable in high temperature and high speed environments.

B Excellent high temperature resistance, lubricity, good colloidal stability and mechanical stability.

C uses a temperature range of -40 to 230 ° C and a short time of 250 ° C.

D is suitable for mechanical use where there is a requirement to reduce noise or the environment is extremely harsh, and it is also suitable for lubrication at high temperatures.

E is highly water-repellent, can withstand water rinsing, and maintains hardness over a wide temperature range. Excellent anti-oxidation performance, good anti-wear performance, resulting in extremely long service life and 5-10 times the service life of lithium base grease.

F is suitable for lubrication of precision NSK bearings, motor NSK bearings and miniature NSK bearings in high and low temperature environments.

G is suitable for lubrication of various high speed NSK bearings, high speed long life gyro motors, high speed grinders and other high speed instruments and mechanical NSK bearings.

H has a smooth structure, fine fibers and high cleanliness. It can suppress the abnormal sound of NSK bearings during operation and meet the long-term operation requirements of high-speed NSK bearings with DN values ​​above 500,000.

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Oil film FAG bearing oil characteristics

Among the accessories for FAG bearings, the FAG bearing oil is indispensable. It has a great effect on the protection and maintenance of FAG bearings! Good lubrication can make the use of FAG bearings smoother and greatly reduce wear. The lubrication characteristics of the rolling mill oil film FAG bearing determine that the oil film FAG bearing oil must meet its performance requirements to ensure the normal operation and continuous production of the rolling mill. Therefore, the oil film FAG bearing oil needs to have:

A good anti-wear and extreme pressure performance, when the oil is mixed with a small amount of water during operation, it can still form an oil film to maintain heavy load and anti-wear performance.

B. Good anti-wear, anti-rust and anti-foam properties, prevent corrosion of the lubrication system, block the oil circuit, cause wear and insufficient oil supply.

C superior demulsibility (ie water separation), can quickly separate the water in the oil in long-term use.

D good oxidation stability, cleanability and filterability. Smooth lubrication system and ensure normal lubrication

E Excellent viscosity-temperature performance (high viscosity index), when the FAG bearing temperature changes greatly, it can still achieve normal lubrication of each lubrication part.

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How to check the fault of SKF bearing during operation

1. First of all, according to the sound of SKF bearing rolling to identify and check

We can use a sounder to check the size and sound quality of the running SKF bearing rolling sound. Because SKF bearings emit abnormal sounds and irregular sounds even if they are slightly peeled off, they can be distinguished by the sounder, which can prevent them in advance.

2. Secondly, the vibration of the SKF bearing at work to identify the inspection

SKF bearing vibration is very sensitive to bearing damage. For example, peeling, indentation, rust, cracks, abrasion, etc. are reflected in the vibration measurement of SKF bearings. Therefore, the vibration can be measured by using a special SKF bearing vibration measuring device (frequency analyzer, etc.). It is not possible to deduce the specific circumstances of the anomaly. The measured values ​​vary depending on the conditions of use of the bearing or the mounting position of the sensor. Therefore, it is necessary to analyze and compare the measured values ​​of each machine in advance to determine the judgment standard.

3. Finally, check according to the temperature of the SKF bearing

The temperature of the SKF bearing is generally estimated based on the temperature outside the SKF bearing. If the oil hole can directly measure the bearing outer ring temperature, it is more suitable.

Usually, the temperature of the SKF bearing rises slowly as the operation starts, and reaches a steady state after 1-2 hours. The normal temperature of SKF bearings varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions. Based on a large amount of test data, Table 4-1 lists the average value of the outer ring temperature when the bearings are working in various machines for reference. Since the temperature is affected by lubrication, speed, load, and environment, the values ​​in the table only indicate the approximate temperature range. The thermal sensor can be used to monitor the working temperature of the bearing at any time, and automatically alarm the household when the temperature exceeds the specified value or stop the occurrence of the burning shaft accident.

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Common problems and countermeasures in the use of IKO bearings

Strong metal tone:

1. Abnormal load: choose the appropriate assembly clearance and preload

2, poor assembly: improve the machining accuracy of the shaft, improve the installation method

3. Insufficient lubricant: supplement or use suitable lubricant

Regular tone:

1. Foreign matter causes channel corrosion, indentation, and scratches: cleaning related parts, using clean grease

2, channel spalling: fatigue wear, replace IKO bearings

Irregular noise:

1. Intrusion of foreign matter: cleaning related parts, using clean grease

2, the clearance is too large: pay attention to match and choose the right clearance

3, steel ball scars: steel ball fatigue peeling or foreign body jam, replace IKO bearing

Abnormal temperature rise:

1. Too much lubricant: Reduce lubricant

2. Insufficient lubricant, or not suitable: increase lubricant or choose suitable lubricant

3, mating surface creep: IKO bearing outer diameter or inner diameter mating surface correction

4, the residual play is too small: mainly because the shaft interference is too large or the hole negative tolerance is too much

5, IKO bearing hole misalignment: misalignment caused early wear and tear of IKO bearing

The rotary vibration of the shaft is large:

1. Peeling: Fatigue peeling off, replacing IKO bearing

2, poor assembly: improve the machining accuracy of the shaft, improve the installation method

3, foreign matter intrusion: cleaning related parts, using clean grease

Lubricant leaks large discoloration:

1. Too much lubricant: reduce lubricant

2, foreign body invasion: cleaning related parts

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