Introduce several common maintenance methods after FAG universal joint bearing damage

Usually, our FAG universal joint bearing will be seriously damaged after using it for a period of time. In this case, what should we do? We should find some common methods for daily maintenance of FAG universal joint bearings. We will introduce them today. Several so that everyone can use it later. One-third of the bearing damage is caused by fatigue damage, the other third is due to poor lubrication, and the other third is due to contaminants entering the bearing or improperly installed.

In this case, we have especially experimented with FAG universal joint bearings with increasing temperature. When inspecting FAG universal joint bearings that have been removed during regular maintenance and operation of bearing equipment and replacement of peripheral parts, it is necessary to judge sequentially. Whether secondary bearing parts can be reused and recorded better than bad. Most FAG universal joint bearings are damaged for many reasons, such as excessively small bearing clearances due to previously estimated loads, ineffective seals, and tight fits. Any of these factors have their particular type of damage and leave a special mark of damage.https://www.supplyforever.com/

FAG spherical roller bearing damage maintenance measures maintenance method

1, the cleaning of the bearing

When disassembling the lower roller bearing for inspection, first record the appearance of the FAG bearing, confirm the residual amount of the lubricant, and then wash the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used.

The cleaning of the removed bearing is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first, so that the FAG bearing does not directly contact the container. When rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.

Fine washing is to carefully clean the spherical roller bearing while rotating in the cleaning oil. In addition, the cleaning oil should always be kept clean.

2. Inspection and judgment of bearings

In order to judge whether the disassembled spherical roller bearing can be reused, it is necessary to check after the bearing is cleaned, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the FAG bearing clearance and Whether there are damages or abnormalities in which the dimensional accuracy is lowered. For non-separable ball bearings, use one hand to support the inner ring and rotate the outer ring to check if it is smooth.

Separate bearings such as spherical roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring.

Large bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the importance of FAG bearings, the more careful inspection is required.

The judgment of whether or not to reuse is determined in consideration of the degree of bearing damage, mechanical properties, importance, operating conditions, and the period until the next inspection. However, if the following defects are not available, the new spherical roller bearings must be replaced:

(a) cracks or notches on any of the inner ring, the outer ring, the rolling elements, and the cage;

(b) rupture on any of the ferrules and rolling elements;

(c) Significant jams on the raceway surface, ribs and rolling elements;

(d) the cage is worn significantly or the rivet is significantly slack;

(e) There is rust and injury on the raceway surface and the rolling elements;

(f) There are severe indentations and marks on the raceway surface and rolling elements;

(g) The inner diameter of the inner ring or the outer diameter of the outer ring has obvious creep;

(h) discoloration due to heat;

(i) Bearings sealed with grease, the seal or dust cover is damaged.

If there is no choice error and can be used correctly, it can be used for a long time before the end of the life of the FAG bearing. In this case, the damage state of the general spherical roller bearing is peeling. On the other hand, there are accidental early damage, and early damage that cannot be used as a cause of this early damage.

The specific reasons are insufficient consideration for use and lubrication, as well as foreign matter intrusion, bearing assembly error and shaft deflection, and insufficient research on the shaft and bearing housing. It can be said that these reasons overlap with each other. Therefore, we recommend that you choose the size of the bearing according to the life formula of the FAG bearing, and on the basis of the machine used in the demodulation of the heart roller bearing, the conditions of use, and the structure of the outer periphery of the bearing, if the situation before and after the accident can be clarified, Combined with the damage of the bearing and various reasons, it can prevent the recurrence of similar accidents.https://www.supplyforever.com/

INA thrust tapered roller bearing cage clearance adjustment

Whether it is an INA bearing or other types of bearings, it is generally divided into two types: a cage with and without a cage. Among them, large-sized thrust tapered roller bearings generally require a large load, often without a cage, but filled with rolling elements between the inner and outer raceways. Most small and medium-sized rolling bearings are equipped with cages.
In the INA bearing process, how the outer ring, inner ring, rolling element and cage of the bearing are assembled. Simply put, the inner and outer rings of the bearing are placed first, the inner ring is placed sideways, then the rolling elements are placed (on one side), then the position of the rolling elements is adjusted, and finally, the cage is placed. Now everyone knows that there is also a cage involved in the processing of thrust tapered roller bearings. What is the main function of the bearing cage?
1. Adjust the gasket method:
A set of soft material (soft steel sheet or elastic paper) gasket is placed between the INA bearing end cover and the end face of the bearing housing; when adjusting, do not put the gasket on the bearing end cover, and evenly tighten the bearing end cover on one side. The screw is rotated by hand until the bearing rolling element contacts the outer ring and there is no gap inside the shaft; at this time, the gap between the thrust tapered roller bearing end cover and the end face of the bearing seat is measured, and the bearing is in normal operation. The axial clearance required; this is the total thickness of the required gasket, then the prepared gasket is placed between the bearing end cap and the end face of the housing, and finally the screw is tightened.
2. Adjust the bolt method:
Press the pressure ring on the outer ring of the INA bearing and pressurize it with the adjusting bolt. Before adjusting the pressure, first measure the pitch of the adjusting bolt, then slowly tighten the adjusting bolt until there is no gap inside the bearing, then calculate Adjust the corresponding rotation angle of the bolt. For example, the pitch is 1.5mm, the clearance required for the normal operation of the thrust tapered roller bearing, then the rotation angle required to adjust the bolt is 3600×0.15/l.5=360; then the adjustment bolt is reversed 360, and the miniature bearing gets 0.5. The axial clearance of mm can then be fixed with a stop washer.
The INA bearing is called a window and is used to isolate and guide the rolling elements. The pocket clearance allows the cage to have a certain amount of motion in the radial and axial directions. The total radial activity is called the gap of the cage. There are many types of structures and complicated shapes in the roller cage. There are many equidistant pockets on the cage. The pockets are spherical, round, elliptical, rectangular and toothed. The size is larger than the size of the rolling element. The difference between the two is the pocket clearance, sometimes for the rolling cage window. The portion of the connection between them is called a lintel, which acts to connect and increase the strength of the cage.

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Deep groove ball bearings and double row deep groove ball bearings

Core Tip: Deep groove ball bearings are the most common type of rolling bearings. The basic deep groove ball bearing has an outer ring, an inner ring, a set of steel balls and a set of cages. Deep groove ball bearing
Deep groove ball bearings are the most common type of rolling bearings. The basic deep groove ball bearing has an outer ring, an inner ring, a set of steel balls and a set of cages. Deep groove ball bearing type code is 6. Deep groove ball bearings are mainly used to withstand pure radial loads and can also withstand radial and axial loads. When it is only subjected to a pure radial load, the contact angle is zero. When the deep groove ball bearing has a large radial clearance, it has the performance of an angular contact bearing and can withstand a large axial load. The deep groove ball bearing has a small friction coefficient and a high limit speed. Especially in high-speed running conditions with large axial loads, deep groove ball bearings are superior to thrust ball bearings. The deep groove ball bearing has a simple structure and is easy to achieve high manufacturing precision compared with other types, so it is easy to be mass-produced in series, and the manufacturing cost is also low, and the use is extremely common. In addition to the basic type, deep groove ball bearings also have various modified structures, such as: deep groove ball bearings with dust cover; deep groove ball bearings with rubber seals; deep groove ball bearings with snap grooves; Deep groove ball bearings with large load capacity of ball notches; double row deep groove ball bearings. 1. Deep groove ball bearing with dust cover Standard type Z-type and 2Z type with deep groove ball bearing with dust cover, Z type with dust cover on one side and 2Z type with dust cover on both sides. The bearing with dust cover is used in the condition that it is difficult to separate the lubrication, the lubricating oil road is installed and the inspection condition is inconvenient. The bearing has been filled with the quantitative and fixed grade of anti-rust and lubricating lithium-based grease in the manufacturer. The amount of grease injected into each bearing is usually 1/4~1/3 of the effective space in the bearing. It can also increase or decrease the amount of grease according to user requirements. The injected grease usually ensures that the bearing operates at -40 to +120 °C. If the user has higher requirements for the bearing, other properties and grades of grease can be filled according to the situation. Bearings with dust caps can be effectively worked for a long time after being greased, without the need to add grease during use. The bearing with dust cover is mostly used for small and medium-sized generators, both ends of the rotor of the motor, automobiles, tractors, air conditioners, fans, etc., as well as occasions where the noise vibration of the bearing is particularly required. 2. Deep groove ball bearing with sealing ring Standard type deep groove ball bearing with sealing ring has contact type sealed bearing RS type (one side seal), 2RS type (two side seal) and non-contact type sealed bearing RZ type (one side seal) 2RZ type (two-sided seal). The performance, grease and use of bearings with seals are essentially the same as for bearings with dust caps. The difference is that there is a large gap between the dust cover with the dust cover bearing and the inner ring, and the gap between the sealing lip and the inner ring of the non-contact seal bearing is small, and the sealing lip of the contact seal bearing is There is no gap between the inner rings, the sealing effect is good, but the friction is increased. In the case of low noise requirements, the smaller size deep groove ball bearings of the 60 and 62 series are used. Regardless of open bearings, bearings with dust caps or seals, low noise and low vibration requirements can be specified when ordering. In China's JB (Mechanical Industry Standard), the vibration allowable values ​​of the three frequency bands of V1, V2, and V3 are specified. Ultra-low noise bearings are also available from SKF, which are marked with the rear code QE5. 3. Deep groove ball bearing with snap groove and retaining ring. Standard type deep groove ball bearing with snap groove, rear coded N, bearing rear stop code with stop groove and stop ring It is NR, in addition to ZN, ZNR and other structural variants.

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INA deep groove ball bearings limit speed maintenance steps

When the INA bearing is operated under a load condition of 0.1 C, the contact stress between the rolling element and the raceway contact surface increases, resulting in an increase in the working temperature of the bearing, and the performance of the lubricant is relatively deteriorated. Therefore, the limit of the deep groove ball bearing The speed will be reduced accordingly.

For the range of C/=10, since the reduction of the limit rotation speed is small, it can be disregarded, that is, the value is f1=1.

For the radial bearing subjected to the combined load, the number of rolling elements under load increases, the frictional resistance increases, the heat generation increases, the lubrication and cooling conditions become worse, and the force acting on the cage also increases. According to the bearing type and the load angle, the limit rotation speed of the deep groove ball bearing is multiplied by a reduction factor f2 to adjust.

If the limit speed of the selected INA bearing can not meet the requirements of use, some improved technical measures can be used to improve to meet the satisfactory requirements. Such as increasing the bearing tolerance level; appropriately increasing the clearance; changing the special material and improving the structure of the cage; changing the lubrication method, such as oil and gas, oil mist and jet lubrication; improving the cooling conditions.

First, the test method for bearing lubrication maintenance

During operation, the lubricating oil should be kept open, and the sealing of the seal should be checked regularly to replace the damaged seal. Also monitor the health of the situation and can get from the noise. Lubricant, temperature and other aspects are monitored. Because it should be a smooth humming sound during normal operation, it will be treated promptly when abnormality occurs. The normal lubricant is clear and clean. If the lubricant has become dirty, there will be worn particles or contaminants. When the temperature rises, it will run. An exception will occur.

Second, the specific steps of bearing lubrication maintenance

1, the importance of lubrication

Highly valued INA bearing lubrication technology. Lubrication can use oil film to separate the relatively moving rolling surfaces from each other, without excessive wear due to rough contact, and to ensure stable performance and rotational accuracy during a given working life.

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Effect of lubricating oil on the performance and life of INA universal joint bearings

INA bearing lubricants can be broadly divided into two categories: lithium-based and calcium-based. Vibration control systems can help solve problems. Based on the application technology of the LM Guide Ball Screw, the system protects people's lives and lives during an earthquake. The system not only prevents damage caused by earthquakes, but also has excellent water resistance, mechanical stability and chemical stability of lithium-based lubricating oil. Lithium soap has strong thickening ability, and extreme pressure is added to the grease. After adding additives such as agents and rust, a variety of long-life fats are prepared. It can also reduce people's panic because of their ubiquity, reliability and durability. Brick machine bearings use harsh environment, long time, heavy load and difficult maintenance. Therefore, most of them use lithium-based lubricants.

If there are foreign objects such as iron filings, burrs, dust, etc. in the INA bearing, it will cause noise and vibration during the operation of the universal joint bearing, and even damage the raceway and rolling elements. Therefore, before installing the bearing, you must ensure that the mounting surface and the installation environment are clean.

Lubrication has a very important influence on the operation and life of INA bearings. Grease is made from base oils, thickeners and additives. The performance of the grease is primarily determined by the base oil. Generally low viscosity base oil is suitable for low temperature and high speed; high viscosity is suitable for high temperature and high load.

The thickener is also related to the lubricating properties, and the water resistance of the thickener determines the water resistance of the grease. In principle, the different greases of the brand cannot be mixed, and even the grease of the same thickener may have a bad influence on each other due to the different additives. The universal joint bearing surface is coated with anti-rust oil, which must be carefully cleaned with clean gasoline or kerosene, and then cleaned with high-quality or high-speed high-temperature grease for installation. Fully enclosed bearings do not need to be cleaned and refueled.

After the INA bearing is installed, if it is not carefully aligned, alignment may result in additional loads, friction and vibration of the bearing. These can accelerate fatigue and reduce bearing life and can damage the life of other machine parts. In addition, increased vibration and friction can greatly increase energy consumption and risk of premature failure.

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Original NSK bearing common fault analysis

1. NSK bearing surface strain: cutting abrasive grains are found in the iron spectrum, and the abrasive grain composition is non-ferrous metal.

2, NSK bearing journal surface corrosion: Spectral analysis found that the concentration of iron is abnormal, there are many sub-micron particles of iron in the iron spectrum, the lubricating oil exceeds the standard or the acid value exceeds the standard.

3, NSK bearing tile surface corrosion: spectral analysis found that the concentration of non-ferrous metal elements is abnormal; there are many sub-micron wear particles of non-ferrous metal components in the iron spectrum; lubricating oil moisture exceeds the standard, acid value exceeds the standard.

4, NSK bearing tile back fretting wear: spectral analysis found that the iron concentration is abnormal, there are many iron components in the iron spectrum sub-micron wear particles, lubricating oil moisture and acid value is abnormal.

Under liquid lubrication conditions, the sliding surface is separated by the lubricating oil without direct contact, and the friction loss and surface wear can be greatly reduced. The oil film also has a certain vibration absorbing capability.

5, NSK bearing journal surface strain: iron spectrum cutting abrasive grains or black oxide particles in the iron spectrum, tempering color on the metal surface.

6. Super-precision NSK bearings do not produce metamorphic layers and spikes that are extremely prone to wear, and can also remove the metamorphic layer left by grinding. Increase the service life of the workpiece by about 5 times.

7. The workpiece after super-finishing after NSK bearing grinding can reduce the running noise by 8~10dB after assembly, and the vibration is small. Smooth operation.

8. The margin of ultra-finished NSK bearings is reduced by an order of magnitude compared to the grinding allowance, which is actually only a few microns. For low pressure feed processing. Therefore, the super-finishing has a small dimensional dispersion and an extremely high yield.

9. Super-precision NSK bearing surface is cross-mesh, easy to store oil, and will not be easy to wear, easy to heat and burn phenomenon during grinding.

10. Super-precision NSK bearings have more complicated trajectories and can be transferred from grinding to grinding, which can reduce surface roughness faster. However, due to its repeated changes in the direction of motion, it affects the quality of the machined surface.

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