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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A simple and simple way to identify skf bearings

1. First look at the outer packaging box of SKF imported bearings. The general packaging box is white, blue and red. However, in the past two years, the products have flower boxes and the patterns are several SKF trademarks.

2. Look at the date of manufacture of the bearing. If the bearing is opened from the side, the box has the date and date of manufacture.

3. For bearings produced after 2000, there are barcodes on the boxes of SKF bearings.

4. Look at the bearing model. The bearing models have the suffix letters A, B, C, D, E, etc. These letters represent different years of production.

5. Pay attention to the SKF font on the trademark, S is the upper narrow and the lower width, and the left vertical drawing of K and F has pits.

6. Look at the stamp, SKF imported bearings on the model, the origin of the letters are pickled and laser processing two. It is smoother when touched by hand, and the font of the fake bearing is generally engraved.

7. Look at the place of origin, ball bearing origin: Malaysia, Italy, France, the United States (American bearings are generally only used in the United States); Short cylindrical bearing Origin: Germany; Angular contact bearing Origin: Austria; Spherical roller bearing Origin: Malaysia ( Generally small 2315, 2316, 2318), Sweden (large model), Germany (large model); needle bearing origin: Germany.

8. After the SKF imported bearings are opened, the large bearings are generally sealed plastic bags, and the small bearings are plastic wrapping paper. There is a layer of grease on the bearing, the true bearing looks bright, no rust and pitting.

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Detailed explanation: TIMKEN thrust ball bearing

Thrust ball bearings are introduced in a bondable construction because the device is easy because the seal and ball and cage assembly can leave the device. The two-way thrust ball bearing consists of a shaft collar, two bearing races, and two ball and cage thrust assemblies. Bearings can be combined because the device is easy. Each can leave the device. The bearing races as well as the ball and cage assemblies are identical to the one-way bearings.

The thrust ball bearing is a combined bearing, and the shaft ring and the seat ring can be combined with the components of the maintenance frame and the steel ball. The collar is a ferrule that cooperates with the shaft. The race is a ferrule that cooperates with the bore of the bearing housing and has a gap between the shaft. According to its construction, it is divided into one-way thrust ball and two-way thrust ball bearing.

One-way thrust ball bearings accept axial loads in one position, and two-way thrust ball bearings accept axial loads in two positions. They all make it impossible to accept radial loads. The one-way thrust ball bearing consists of a shaft collar, a bearing race, and a ball and cage thrust assembly.

The two-way thrust ball bearing is capable of accepting axial loads in two positions and is a two-way flow machine shaft. Such bearings must not accept any radial loads. The thrust ball bearing has a structure with a seat cushion. Since the device surface of the seat cushion is spherical, the bearing is in a self-aligning function, which can reduce the reaction of the device error. Thrust ball bearings are important for buses and machine tools.

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