INA imported bearings damage regular maintenance measures

Rolling bearings, if there is no choice of mistakes can be used correctly, can be used for a long time before the life of INA bearings, in this case, the damage state is peeling.

On the other hand, there are accidental early damage, and early damage that cannot be used, as the cause of the early damage, there is insufficient consideration of the use of scare lubrication, and further foreign matter intrusion, error and shaft of INA imported bearing assembly The deflection is large, and the research on the shaft and the bearing housing is not enough. It can be said that these reasons overlap with each other.

Therefore, in order to fully understand the machine used in the bearing, the conditions of use, and the structure of the outer ring of the INA bearing, if the situation before and after the accident can be clarified, combined with the damage of the bearing and various reasons, it can be prevented. The same kind of accident happened again.

The equipment is inspected regularly, the operation inspection and the bearings removed during the replacement of the peripheral parts are inspected, and the second time is judged whether it can be used again or the use condition is better or worse. The bearings and appearance of the INA bearings that have been removed should be carefully investigated and recorded. In order to clarify and investigate the remaining amount of lubricant, the bearings should be cleaned well after sampling.

Next, check the condition of the raceway surface, the rolling surface and the mating surface, and the wear state of the cage, etc., for damage and abnormality.

Judging whether INA imported bearings can be used again, it is necessary to consider the degree of bearing damage, machine performance, importance, operating conditions, inspection cycle, etc. If the bearing is found to be damaged or abnormal, the contents of the injury section will be identified and the countermeasures will be developed. In addition, the inspection results, if there are the following defects, the bearings can no longer be used, need to replace the new INA bearings.

a. Cracks and fragments appear in any of the inner and outer rings, rolling elements, and cages.

b. Any one of the inner and outer rings and the rolling elements are peeled off.

c. The raceway surface, the ribs, and the rolling elements have significant jamming.

d. The cage is worn out or the rivets are loose.

e. The raceway surface, rolling elements are rusted and flawed.

f. There are significant indentations and marks on the rolling surface and the rolling elements.

g. There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.

h. Superheated and discolored.

i. Grease seal bearing seals and dust cover damage are serious.https://www.supplyforever.com/

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.https://www.supplyforever.com/

Bearing model and auxiliary mark

Core Tip: Bearing form ● Inch single row deep groove ball bearing: R ● inch flanged single row deep groove ball bearing: FR ● metric single row deep groove ball bearing: mark omitted ● metric single flange deep groove ball bearing:
Bearing form
●Inch single row deep groove ball bearings: R
●Inch single-row deep groove ball bearings with flange: FR
●Metric single row deep groove ball bearings: Marking omitted
●Metric flanged single row deep groove ball bearings: F
●Special size metric single row deep groove ball bearings: MR
●Special size metric flanged single row deep groove ball bearings: MF
●With channel thrust bearing: FM
●No channel thrust bearing: F
Sealing ring
●Teflon seals with contact ring on both sides:
 TT
●Leather cover on both sides: ZZ
●Double contact rubber seals: 2RS
Lubricant
● The main grease grade
Maltemp SRL (standard grease for miniature, small bore bearings):
Alvania No. 2 (standard grease for small and medium bearings):
Aero shell No.16 (for high temperature):
Molykote 33M (for low load, low temperature):
Krytox 240AC (for ultra high temperature):
Isoflex Super LDS18:
Beacon325: Marking

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Performance characteristics and application of high temperature and high speed grease for bearings

Core Tip: CaidonMC20 high-temperature high-speed bearing grease: high-temperature thickener thickening synthetic oil, and adding multi-effect additives, is a high-quality long-term high-temperature environment to maintain normal working conditions
CaidonMC20 high-temperature high-speed bearing grease: high-temperature thickener thickening synthetic oil, and adding multi-effect additives, is a high-quality grease that maintains normal working conditions in high temperature environment for a long time.
Performance characteristics:
● Smooth structure, fine fiber, high cleanliness, can suppress the abnormal sound of the bearing during operation, and meet the long-term operation requirements of high-speed bearings with DN value above 500,000.
● Excellent high and low temperature resistance, lubricity, good colloidal stability and mechanical stability
● Waterproof, able to withstand water rinsing and maintain 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
● Extremely high temperature withstand capability and high-speed shear resistance, making it easy to handle in high temperature and high speed environments
● Operating temperature range is -40~230°C, short time up to 250°C
  Recommended Applications:
● Suitable for lubrication of precision bearings, motor bearings and miniature bearings in high and low temperature environments
● Suitable for lubrication of various high speed bearings, high speed long life gyro motors, high speed grinders and other high speed instruments and mechanical bearings
● It is suitable for mechanical use that requires noise reduction or extremely harsh environment. It is also suitable for lubrication of high temperature parts.https://www.supplyforever.com/

Brief introduction of rolling noise detection technology for INA needle roller bearings

Since the bearing parts inevitably have some geometrical errors during processing, this causes the bearings to transmit fine noise during operation.
    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 the needle roller bearing parts are processed by the highest modern manufacturing technology, there will always be a small geometric error in the working surface, so that small fluctuations between the raceway and the rolling body stimulate the natural vibration of the vibration system.
1. Oil film resistance diagnosis technology
Features: The same criteria can be used for different working conditions. It has a poor diagnostic effect on abnormalities such as surface peeling, indentation, and cracks.
Application range: Suitable for occasions where the rotating shaft is exposed.
2. Vibration diagnosis technology
Features: Vibration diagnostic technology is widely used; online monitoring can be realized; diagnosis is fast, and diagnostic theory is mature.
Scope of application: Particularly suitable for fault monitoring of INA bearings in rotating machinery.
3. Ferrography diagnostic technology
Features: The machine does not need to be disassembled; the investment is low, the effect is good; the early fatigue failure of the needle roller bearing can be found; the wear mechanism can be studied.
Scope of application: It is suitable for fault diagnosis of INA bearings lubricated with lubricating oil, which is difficult for bearings lubricated with grease.
4. Temperature diagnostic technology
Features: Simple diagnosis; better judgment on bearing burns.
Application: Suitable for simple routine diagnosis of needle bearings in machines.
5. Optical fiber monitoring and diagnosis technology
Features: The fiber displacement sensor has high sensitivity; the signal is directly extracted from the INA bearing surface, which improves the signal-to-noise ratio; it can directly reflect the manufacturing quality, surface wear degree, load, lubrication and clearance of the bearing.
Applications: Suitable for machines where the sensor can be mounted in a housing.

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Thrust spherical roller bearing

Core Tip: Thrust spherical roller bearings are mainly used to withstand axial loads and cannot limit the radial displacement of the shaft. Since the rolling elements use rollers, they are more capable of axial load than thrust ball bearings.
The thrust spherical roller bearing is mainly used to bear the axial load and can not limit the radial displacement of the shaft. Since the rolling element adopts a roller, it has much greater axial load capacity than the thrust ball bearing, and is generally separable. Type bearing, can be installed separately tight ring. The ring is not allowed to tilt the axis of the shaft and the casing during installation. Model 39000 Thrust Spherical Roller Bearings Because the rolling elements are asymmetrical spherical rollers, the inner and outer ring raceways are also rolling surfaces, so they can be adjusted. Its axial load capacity is large, it can withstand a certain amount of radial load, and it has greater load capacity than the 69,000-type bearing, which is the development direction. This type of bearing can only withstand one-way axial loads. 69000 type thrust spherical roller bearing The performance of this kind of bearing is the same as that of type 39000, but the rolling element is a symmetrical spherical roller. The structure is backward, the load capacity is smaller than that of the 39000 type bearing, and it is not suitable for development. Therefore, the new mainframe design should try the type 39000. Bearing.

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Lubricant tips for use in INA plain bearings

Proper installation and maintenance is an important factor in the longest service life of INA bearings. At the same time, attention must be paid to the cleanliness of the bearings, the correctness of the choice of bearings and the selection of appropriate installation and maintenance tools. In addition, the plain bearings must be protected from contamination and moisture and ensure proper installation and lubrication. Therefore, the design of the bearing arrangement, 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 be soft. In the end, the sliding bearings may be damaged due to the easy loss of grease. If you don't know which grease is used in the INA bearing, you must completely remove the old grease inside and outside the bearing before adding new grease.

There are usually the following basic requirements for lubricants:

(1) It has sufficient lubricating effect, which can reduce the friction of the bearing and inhibit the harmful wear process in the bearing. The frictional resistance is small and the anti-wear ability is large.

(2) Preventing corrosion of the bearing, which itself does not cause corrosion, deterioration or deformation of components of the sliding bearing (such as copper cages, rubber seals, etc.).

(3) It is possible to maintain the necessary lubricating performance within the range of the upper and lower limits of the specified operating temperature, and the chemical composition is stable and the viscosity does not change much.

(4) A sufficiently thick oil film can be established within the range of the upper and lower limits of the specified working speed; it is clean, free of impurities, and has good defoaming properties.

(5) Physical properties and chemical properties are stable enough during the required working period or during the inventory period, so as not to affect the quality of the use.

(6) Maintenance and maintenance are simple and the attachments are as small as possible.

(7) Under the premise of meeting the above technical requirements, economically strive to save.

2. Additional requirements for lubricants

(1) has a good cooling effect.

(2) It has strong adhesion to the surface to be lubricated, and leakage, dripping or scattering is as small as possible; water separation is good.

(3) Mixing a small amount of impurities (such as moisture) does not affect its performance.

(4) It acts as a seal to prevent water or dirt from entering the bearing.

(5) It is not easy to transmit vibration or reduce noise.

(6) Centralized lubrication can be implemented.

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INA roller bearings are maintenance inspection standards

In order to fully utilize INA bearings and maintain their proper performance for a long time, regular maintenance (regular inspection) must be performed. Through proper periodic inspections, early detection of failures and prevention of accidents are important to improve productivity and economy.

Key factors affecting the life of a roller bearing For many rotating machinery products, their service life depends on the life of the bearing components at critical parts of the product. "Maintenance-free" bearings are not one-way bearings that will never be damaged or failed but will not be damaged within a certain period of time. Here the designers calculate the service life of the bearing. The bearing life of the INA bearing is greater than or equal to the overhaul period of the mechanical product. The bearing can be “maintenance free”. When the mechanical product is overhauled, the new bearing can be replaced without using the used bearing. Carry out maintenance.

1, cleaning

When the INA bearing is removed for inspection, the appearance record is first recorded by photography. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings.

a. The cleaning of the bearing is carried out by rough washing and fine washing, and a metal mesh frame can be placed on the bottom of the used container.

b. When rough washing, remove the grease or adhesive with a brush or the like in the oil. At this time, if the bearing is rotated in the oil, be careful that the rolling surface will be damaged by foreign matter or the like.

c. When washing finely, slowly rotate the bearing in the oil and carry out it carefully.

The cleaning agent generally used is a neutral non-aqueous diesel oil or kerosene, and a warm alkali liquid or the like is sometimes used as needed. Regardless of which cleaning agent is used, it is often filtered and kept clean.

Immediately after cleaning, apply anti-rust oil or anti-rust grease to the roller bearings.

2, inspection and judgment

In order to judge whether the removed bearing can be reused, it is important to check its dimensional accuracy, rotation accuracy, internal clearance, mating surface, raceway surface, cage and seal.

Regarding the inspection result, it can be judged by a person who is using a conventional bearing or a proficient bearing.

The criteria for judgment vary depending on mechanical properties and importance, inspection period, and the like. Roller bearings must not be reused if they are damaged and must be replaced.

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Regular maintenance of NTN outer spherical bearings

The correct maintenance and timely maintenance of NTN bearings is an important aspect to ensure the normal operation of road machinery. If the maintenance and maintenance of the outer spherical bearing is good, it can work for several thousand to disappear or even longer; on the contrary, the service life of the outer spherical bearing will be greatly reduced, and even serious accidents such as burning the tile and holding the axle will occur. Generally, the working temperature of the lubricating oil of NTN bearing should not be higher than 50 °C. In order to ensure sufficient lubricating oil and reliable lubrication, it is necessary to check the oil surface in time or regularly so that the oil level is kept within the specified range. To maintain some cleanliness, replace them according to the quality requirements of the oil. The failure of the external spherical bearing should be analyzed in detail and eliminated in time. Common faults and treatment methods for outer spherical bearings are as follows.

In order for NTN bearings to be fully utilized and to maintain their proper performance for a long period of time, regular maintenance (regular inspection) must be performed.

Through proper periodic inspections, early detection of failures and prevention of accidents are important to improve productivity and economy.

When the NTN bearing is removed for inspection, the appearance record is first recorded by photography. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings.

a. The cleaning of the bearing is carried out by rough washing and fine washing, and a metal mesh frame can be placed on the bottom of the used container.

b. When rough washing, remove the grease or adhesive with a brush or the like in the oil. At this time, if the outer spherical bearing is rotated in the oil, be careful that the rolling surface will be damaged by foreign matter or the like.

c. When fine washing, slowly rotate the NTN bearing in the oil, and it must be carried out carefully.

The cleaning agent generally used is a neutral non-aqueous diesel oil or kerosene, and a warm alkali liquid or the like is sometimes used as needed. Regardless of which cleaning agent is used, it is often filtered and kept clean.

Immediately after cleaning, apply anti-rust oil or anti-rust grease to the outer spherical bearing.

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Precautions for preventing premature failure of TIMKEN deep groove ball bearings

TIMKEN bearing contact fatigue failure is the failure of the working surface of the bearing due to the alternating stress, and deep spalling is the intrinsic cause of contact fatigue failure.

We know that contact fatigue spalling occurs on the working surface of deep groove ball bearings, often accompanied by fatigue cracks, first generated from the maximum alternating shear stress below the contact surface, and then extended to the surface to form different spalling shapes, such as dots. Peeling or pitting, peeling off into small pieces called shallow peeling. Due to the gradual enlargement of the exfoliation surface, it tends to expand deeper and form deep exfoliation.

Wear failure refers to the failure of the relative sliding friction between the surfaces resulting in the continuous wear of the metal on the working surface.

Continued wear and tear will cause gradual damage to the bearing components and ultimately lead to loss of bearing dimensional accuracy and other related problems. Wear may affect the shape change. The increase of the clearance and the change of the surface of the working surface may affect the lubricant or cause the pollution to a certain extent, resulting in complete loss of the lubrication function, thus causing the bearing to lose the rotation precision or even the normal operation. Wear failure is one of the common failure modes of various types of bearings. It is usually classified into the most common abrasive wear and adhesive wear according to the form of wear.

The main cause of TIMKEN bearing fracture failure is the defect of TIMKEN bearing itself and the overload during use.

When the applied load exceeds the material strength limit and the part is broken, it is called overload fracture. The main reason for the overload is the sudden failure of the host or improper installation. Defects such as microcracks, shrinkage cavities, air bubbles, large foreign objects, overheated tissue and localized burns of the bearing parts also cause breakage at the defects during impact overload or severe vibration, called defect fracture. It should be pointed out that in the manufacturing process, in the process of re-inspection of raw materials, quality control of forging and heat treatment, and process control, the above defects can be correctly analyzed by instruments, and control must be strengthened in the future. However, in general, most of the deep groove ball bearing fracture failures are overload failure.

1) Keep the bearings and their surroundings clean

2) Careful and careful when using

If it is used carelessly to give the bearing a strong impact, the bearing will be injured, indented, broken and injured.

3) Use the right tools

4) Pay attention to the rust prevention of the bearing

Avoid using it in wet areas, and wear gloves if you don't get sweat on it.

5) Users should be familiar with bearings

6) Formulate the operating specifications for the use of deep groove ball bearings

a, the preservation of bearings

b, cleaning of bearings and their surroundings

c. Inspection of the size and processing quality of the installation site

d, installation work

e, post-installation check

f, disassembly work

g, maintenance (regular inspection)

h, lubricant supplement

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Matters needing attention and maintenance methods during the use of FAG bearings

In addition to excellent quality, FAG bearings are also very precise parts. They are high-performance bearings. If they are used improperly during use, they will not achieve the expected performance, and it is easy to damage the bearings. Already noted. In addition to lubrication, FAG bearings need to pay attention to those aspects of use?

First, use the installation carefully

Strong stamping is not allowed. It is not allowed to directly hit the bearing with a hammer. It is not allowed to transmit pressure through the rolling elements.

Second, use appropriate and accurate installation tools

Try to use special tools and try to avoid using cloth and short fibers.

Third, try to keep the FAG bearing and its surroundings clean

Even if the smiling dust that is invisible to the naked eye enters the bearing, it will increase the wear, vibration and noise of the bearing.

Fourth, to prevent corrosion of FAG bearings

When taking FAG bearings directly by hand, wash off the sweat on your hands and apply high-quality mineral oil before handling. Pay special attention to rust prevention during the rainy season and summer.

Under certain operating conditions, FAG bearings can achieve longer life than traditional calculations, especially at light loads. These special operating conditions are when the rolling surfaces (tracks and rolling elements) are effectively separated by a lubricant film and the surface damage caused by contaminants is limited. In fact, under ideal conditions, so-called permanent FAG bearing life is possible.

When disassembling the FAG bearing for inspection, first record the appearance of the 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 FAG bearings removed are cleaned and cleaned separately, placed in a container, and placed on the bottom of the metal mesh so that the bearings do not directly touch the dirt of the container. In 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.

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Correct use of TIMKEN bearing grease for the cause of the sound

In general, the amount of grease in the TIMKEN 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 early stages of the bearing, most of the grease is squeezed out of the raceway very quickly (less than a minute), and the build-up grease is discharged a small amount while circulating along with the bearing rotor. 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 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. .

The type of lubricating oil or grease is not selected correctly (choose the right one to achieve the best results)

TIMKEN bearings are mixed with moisture, acid or paint, which acts as a corrosive agent.

The TIMKEN bearing is flattened by the seat hole (the roundness of the seat hole is not good, or the seat hole is not twisted straight)

The horn of the bottom surface of the TIMKEN imported housing is not flat (resulting in deformation of the seat hole or even cracks in the TIMKEN bearing housing)

There are debris in the hole of TIMKEN bearing housing (residual chips, dust particles, etc.)

The clearance of the TIMKEN bearing is too small, and the rotation is too tight (the tightening sleeve is too tight)

Insufficient lubrication (oil level is too low, oil or grease leaks through the seal)

The clearance of the TIMKEN bearing is too small (the selection is not appropriate)

The seal is eccentric (touching adjacent parts and rubbing)

TIMKEN bearings are subject to additional loads (TIMKEN bearings are axially tightened, or two fixed ends TIMKEN bearings on one shaft)

The TIMKEN bearing and the shaft are too loose (the diameter of the shaft is too small or the adapter sleeve is not tightened)

TIMKEN bearings are mixed with impurities such as sand or carbon particles to act as an abrasive.

The diameter of the seat hole is too small (causing the TIMKEN bearing temperature to be too high)

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How to maintain the stability of FAG imported bearing grease

In the process of using FAG bearings, especially when lubricating the bearings, pay attention to the amount of grease. If you use grease precisely, ask everyone to understand the movement of the grease in the bearing 6316-2RS to ensure the stability of the grease. The movement of the grease filled in the rolling bearing, followed by the modification of the FAG bearing, can be roughly divided into two stages.

The divergence of grease in the bearing is a divergence in the contours of the bearing. It must be composed of a relatively straight draft. It should be short-lived. The bearing temperature is low and stable during long-term operation. This is a more imaginative lubrication. Grease, so it is especially important for the grease.

In the popular situation, the amount of grease filled in the FAG bearing always surpasses the practical requirement of direct intervention lubrication, saturating the cavity on the frame and the bearing cover, and forming a contour on the periphery of the rolling element. During 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 transferred to change the rolling element into the raceway.

In the early stages of bearing operation, most of the grease is squeezed out of the raceway very quickly (less than one minute), and accumulated in the grease retaining body after the bearing migration transition body, and is discharged a small amount. At this time, the bearing temperature will continue to rise until the excess grease is completely discharged. It can be called the grease's running phase. According to the grease quality and filling amount in the bearing structure, this time may last for ten minutes. And even hours.

When grease is added to anti-friction bearings, high pressure theory may not be required unless it is used with great care. High pressure can damage bearings and waste grease. Excessive grease can cause high temperatures and create an invisible environment around FAG bearings. In most applications, ball or roller bearings are fully lubricated if the grease level is between one-third and one-half of the bearing capacity. The excess will usually be wasted by the sealed casing.

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.

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