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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Analysis of Bearings in Mine Truck Application

In recent years, under the background of tight international energy supply, China has increased investment in new energy fields represented by wind energy, which has gradually increased the output of new energy. However, for a long time, China’s coal-based energy sources The structure will continue. Compared with underground coal mining, open-pit coal mining has high productivity, low accident rate, and easy equipment maintenance and other objective advantages. Whether at home or internationally, vigorous development of open pit mining is a major trend. Mine trucks, one of the important equipment necessary for open pit mining, will also have a bright future with the development of open pit mines.

The tapered roller bearings produced by TIMKEN Bearings have decades of application history in mining trucks and have accumulated considerable application experience. This article will briefly analyze the problems that should be paid attention to when using tapered roller bearings for mining trucks. It is hoped that it will help the majority of mine truck designers and users to better select and use bearings and improve the reliability of mining trucks.

In addition to the factors of system design matching and installation adjustment, there are three main factors that determine the performance of tapered roller bearings: 1) the material of the bearing 2) the roughness of the bearing raceway 3) the surface modification of the bearing raceway . Next, a detailed analysis of the factors that should be considered in these three aspects of bearing selection during mine truck conditions.

First, the material of the bearing

Two considerations are taken into account when considering the material of the bearing: the purity of the steel and the heat treatment process of the steel.

The time it takes for the bearing to run is its fatigue life. The occurrence of spalling is mainly due to the presence of non-metallic inclusions inside the bearing steel. When the bearing is working, non-metallic inclusions will cause stress concentration inside the steel, resulting in weak points. As the bearing runs day after day, these weak points gradually develop into fine cracks, which eventually cause the surface of the raceway to peel off. Therefore, the purity of the steel is critical to the bearing. The smaller the particle size of the inclusions inside the steel, the smaller the number of particles, the smaller the probability of crack occurrence and the higher the fatigue life of the bearing.

With the development of modern smelting technology, the bearing manufacturers of world-class brands have reached a very high level in the purity of bearing steel. In addition to bearing materials that meet ISO and ABMA standards, they also use materials that are cleaner than pure steel to improve the reliability of bearings under high loads. With the hub bearing application in a mining truck, the bearing carries a very high force. Taking the load of 200 tons as an example, the whole vehicle is about 350 tons after full load, and the force of the one-side rear wheel hub bearing reaches about 120 tons. Therefore, if a standard material bearing is selected, its size will be very large. In order to minimize the size of the hub and make the design more compact, bearings with high purity precision materials are often used in this position. Even so, the inner diameter of the bearing is about 500mm.

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The importance of bearing grease stability

Proper use of bearing grease requires knowledge of the movement of the grease in the bearing. Guarantee the stability of the grease. The movement of the grease filled in the rolling bearing can be roughly divided into two stages as the SKF bearing rotates.

By the way, by the way, when lubricating the bearing, pay attention to the amount of grease. For details, please refer to the article "Introduction of the amount of grease used in lubrication of SKF bearings".

In general, the amount of grease in the SKF 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. In this process, the bearing temperature rises rapidly due to the resistance of 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 the bearing crucible, 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 along with the bearing rotating body. At this time, the bearing temperature continues to rise until the excess bearing grease is completely discharged, which can be called the walking phase of the grease. According to the grease quality and filling amount in the bearing structure, this time may last for more than ten. Minutes, even hours.

After the remaining bearing 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 bearing of the bearing. stage. 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 bearing greases are not the same in the contours of the 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 an ideal one. Grease is especially important for grease channeling.

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 bearing torque is large and the temperature is high. Unbalanced, noise may also be generated, and grease is also prone to deterioration and loss.

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