Introduce the precautions for NSK bearing grease selection

In order to better play the best condition of NSK bearing, the choice of NSK bearing grease is directly related to the stable operation of the equipment. The choice of NSK bearing grease must be considered from the following aspects:

1. Anti-rust performance

The rust inhibitor is preferably insoluble in water. Grease should have good adhesion, and the grease used in NSK bearings must have anti-rust effect. And can form a layer of oil film on the steel surface.

2. Mechanical stability

Causes a leak. In normal operation, the grease will become soft during machining. Grease will pass from the bearing housing to the NSK bearing. If the mechanical stability of the grease is insufficient, during the operation, the structure of the soap of the grease will mechanically disintegrate, causing the grease to be destroyed, thereby losing the lubricating effect.

3. Oil seal

Oil seals are necessary to protect NSK bearings and lubricants from external contamination during NSK bearing operation. No matter whether debris or moisture can penetrate into the NSK bearing to prevent damage. Proper equipment maintenance is an important factor in the longest life of NSK bearings. At the same time, it is necessary to pay attention to the cleanliness of the bearings, the correctness of the NSK bearing selection and the selection of appropriate equipment and maintenance tools. In addition, the bearings must be protected from contaminants and moisture and ensure proper installation and lubrication. Therefore, the design of the NSK bearing, the condition of the oil seal, the type of lubricant and the lubrication cycle, and even the special support play the same and important role.

4. Mixed grease

If two incompatible greases are mixed, never mix incompatible greases. Usually its consistency will become soft, and in the end it may cause damage to the NSK bearing due to the easy loss of grease. If you don't know which grease the bearing originally used, you must completely remove the old grease inside and outside the NSK bearing before adding new grease.https://www.supplyforever.com/

Loading and failure of rolling bearings

1. Load bearing characteristics of rolling bearings
       (1) The contact load and stress change when the rotating ring and the rolling element pass through the points of the bearing area; and the contact load and stress at each contact point are characterized by pulsating circulation; the unloaded area is not loaded;
      (2) The load and stress of each point of the fixed ring are unequal, and the contact load and stress at each bearing point are characterized by the same pulsation cycle, but the amplitude values ​​are different;
      The maximum value of the load at the lowest end is, for deep groove ball bearings (class 6): F0 = (4.37 / Z) Fr.


2. Failure form of rolling bearing
     (1) For normal running bearings (10 r/min<n<nlim) - fatigue pitting of inner and outer rings and rolling elements;
     (2) For bearings that are stationary or have low speed (n ≤ 10 r/min) or intermittent oscillations - plastic deformation of the inner and outer rings and rolling elements;
     (3) Unavoidable friction and wear of the inner and outer rings and rolling elements;

3. Design criteria for rolling bearings
     (1) For normal running bearings - to prevent fatigue pitting, based on the calculation of fatigue strength, calculate the life;
     (2) For low-speed bearings, or bearings that are subjected to continuous loads or subjected to intermittent loads without rotation, it is required to control plastic deformation, - to calculate static strength;
     (3) For high-speed running bearings - in addition to the life calculation, the limit speed of the bearing must also be checked.https://www.supplyforever.com/

FAG cage and materials

Core tips: 1) Entity cage. After A or B is placed in the cage designation, A indicates that the cage is guided by the outer ring and B indicates that the cage is guided by the inner ring. F-steel solid cage, guided by rolling elements. FA
1) Physical cage. After A or B is placed in the cage designation, A indicates that the cage is guided by the outer ring and B indicates that the cage is guided by the inner ring. F-steel solid cage, guided by rolling elements. FA-steel solid cage with outer ring guide. FAS-steel solid cage with outer ring guide and lubrication groove. FB-steel solid cage with inner ring guide. FBS-steel solid cage with inner ring guide and lubrication groove. FH-steel solid cage, carburized and quenched. H, H1-carburized quenching cage. FP-steel solid window cage. FPA-steel solid window cage with outer ring guide. FPB-steel solid window cage with inner ring guide. FV, FV1-steel solid window holder, after aging, quenching and tempering treatment. L-light metal solid cage, guided by rolling elements. LA-light metal solid cage with outer ring guide. LAS-light metal solid cage with outer ring guide and lubrication groove. LB-light metal solid cage with inner ring guide. LBS-light metal solid cage with inner ring guide and lubrication groove. LP-light metal solid window cage. LPA-light metal solid window cage with outer ring guide. LPB-light metal solid window cage, inner ring guide (thrust roller bearing for shaft guidance). M, M1-brass solid cage. MA-brass solid cage with outer ring guide. MAS-brass solid cage with outer ring guide and lubrication groove. MB-brass solid cage, inner ring guide (thrust spherical roller bearings for shaft guide). MBS-brass solid cage with inner ring guide and lubrication groove. MP-brass solid straight pocket holder. MPA-brass solid straight pocket holder with outer ring guide. MPB-brass solid straight pocket holder with inner ring guide. T-phenolic laminate tube solid cage, guided by rolling elements. TA-phenolic laminated cloth tube solid cage, guided by outer ring. TB-phenolic laminate tube solid cage with inner ring guide. THB-phenolic laminated tube tube pocket holder with inner ring guide. TP-phenolic laminated tube straight pocket holder. TPA-phenolic laminate tube straight pocket holder, outer ring guide. TPB-phenolic laminated cloth tube straight pocket holder, inner ring guide. TN-engineering plastic mold holders, guided by rolling elements, with additional numbers to indicate different materials. TNH-engineered plastic self-locking pocket holder. TV-glass fiber reinforced polyamide solid cage, steel ball guide. TVH-glass fiber reinforced polyamide self-locking pocket type solid cage, steel ball guide. TVP-glass fiber reinforced polyamide window type solid cage, steel ball guide. TVP2-glass fiber reinforced polyamide solid cage with roller guide. TVPB - glass fiber reinforced polyamide solid cage with inner ring guide (thrust roller bearing for shaft guidance). TVPB1-glass fiber reinforced polyamide solid window cage, shaft guide (thrust roller bearing). 2) Stamping cage J-steel stamping cage. JN-deep groove ball bearing riveted cage. 3) Cage change The number added to the cage code or inserted in the middle of the cage code indicates that the cage structure has changed. These numbers are only used during the transition period, for example: NU1008M1.

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Simple troubleshooting tips for the abnormal temperature of the Endian bearing vibration

In the process of using the Entien bearing, there are often customers who reflect the abnormal temperature of the bearing vibration. According to the technical interpretation of the bearing group, the following factors are caused: the temperature of the general bearing rises as the speed of the bearing increases. And the temperature reached a stable level after 1-2 hours of stable operation. There are many main factors determining the temperature of the bearing, such as speed, lubricating oil, load, foreign matter intrusion and the like. If the above situation must be stopped, take the necessary inspection measures.

Customers are advised to monitor the operating temperature of the Endian bearing at any time using a thermal sensor. Long-term continuous rotation of the bearing at temperatures above 125 °C will reduce bearing life. Causes of high temperature bearings include: insufficient lubrication or excessive lubrication, lubricants. It contains impurities, the load is too large, the K bearing is damaged, the gap is insufficient, and so on. If it is not discovered and processed in time, the bearing will be scrapped. Therefore, it is necessary to continuously monitor the bearing temperature, whether it is measuring the bearing itself or other important parts. If the operating conditions are the same, any temperature change can indicate that a fault has occurred.

If the bearing produces abnormal vibration during operation, it is easy to cause damage. Specifically, it includes damage such as peeling damage, indentation damage, crack damage, and abnormal wear. Therefore, the vibration can be measured by the bearing vibration measuring device. The measured value is different depending on the operating conditions of the Entalion bearing or the mounting position of the sensor. We recommend that the customer record the value of the normal operation of the machine in advance to facilitate comparison. analysis.

The first type: observation method

If the bearing is well lubricated and properly blocks debris and moisture, it means that the oil seal should be free of wear. However, it is best to visually inspect the bearing and periodically check the oil seal when opening the bearing housing. Check the condition of the oil seal near the bearing. To ensure that they are sufficient to prevent hot liquids or corrosive liquids or gases from penetrating into the bearing along the shaft. The protective ring and the labyrinth oil seal should be greased to ensure maximum protection. The oil seal should be replaced as soon as possible if it is worn.

Second: Listening

It is best to use the sense of hearing to identify if the Entien bearing is working correctly. If the bearing is in good working condition, it will make a low humming sound. If it is a sharp hum, arpeggio and other irregular sounds, it usually indicates that the bearing is in poor working condition.

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Technical repair method for NTN bearing

NTN bearings are mass-produced mechanical parts, and the manufacturing precision is very strict, and the degree of technical specialization is very high. Therefore, for most of the easy-to-buy bearing types, it should be more cost-effective to buy than in the following cases. Next, consider the bearing repair problem, namely:

(1) A large number of bearings of the same type used in large factories are mainly in the form of wear on the rolling surface, fatigue or fretting abrasion, especially the damaged parts are mostly cages or rolling elements, and the ferrules or gaskets are still repaired. value;

(2) Large and extra large bearings, which have no major damage to the parts due to failure or failure, or expensive NTN bearings must seek to extend their useful life;

(3) Some types of bearings that are really difficult to purchase, have no spare parts after failure and have to be repaired, especially imported bearings;

(4) The bearing has slight damage, such as slight rust generated during the inventory period, and slight fretting abrasion caused by transportation. It is a pity that such repair is easy and abandon.

In addition to economics, the repair of NTN bearings is technical, which requires the repairer to fully understand the corresponding technical requirements of the bearing, and the structural, technical and material characteristics of the bearing and its parts, otherwise it is difficult to guarantee the repair of the bearing. Have the desired effect.

In the business of repairing bearings, if the cooperation of professional bearing companies can be obtained, the following benefits may be obtained:

(1) The technical requirements of each process of repair can be clarified, and how to ensure the overall quality of the repaired bearings,

(2) It is possible to utilize many of the specialized experience of specialized bearing plants, which can reliably, efficiently and economically meet process requirements;

(3) It is possible to order a tool for a professional bearing company, which can be economical and saves a lot of trouble;

(4) Orders such as cages, rolling elements, rivets, etc. can be ordered from professional bearing companies, which may make the repair work simple, convenient and economical.

If the NTN bearing is mounted on the adapter sleeve, determine the direction of the housing. The nozzle tip of the housing cap should always be on the other side of the adapter nut. Care must be taken in the direction of the entire housing as the top cover and base must be installed in the original orientation.

1. Bearing installation and disassembly are sometimes involved; the movement of heavy objects, the use of tools and other equipment, or the use of high pressure oil.

2. Make sure the environment is clean.

3. Check the size and shape tolerances of the journal.

4. Check that the surface roughness Ra of the support surface is not more than 12.5 μm. The flatness tolerance should be IT7. For applications with lower requirements, IT8 is available.

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Detailed steps for maintenance of TIMKEN imported bearings

In order to fully utilize TIMKEN's imported 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.

1, cleaning

When removing the TIMKEN imported bearings, first take a look at the appearance with 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 bearing.

2, inspection and judgment

In order to judge whether the removed TIMKEN bearings can be reused, it is necessary to check the dimensional accuracy, rotation accuracy, internal clearance and mating surfaces, raceways, cages and seals.

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. Bearings must not be reused if they are damaged and must be replaced.

1) Breakage and defects of bearing components.

2) Peeling of the rolling surface of the raceway surface.

Bearing fault identification method

It is important to improve the productivity and economy by identifying or predicting the failure of the bearing in operation without disassembly inspection.

The main methods of identification are as follows:

1) Identify by sound

It takes a lot of experience to identify by sound. Must be fully trained to be able to identify bearing sounds and non-TIMKEN imported bearing sounds. To this end, the work should be carried out by a dedicated person. The sound of the bearing can be clearly heard by attaching a listener or a listening stick to the housing.

2) Identification by working temperature

This method is a comparative identification method and is limited to occasions where the operating state does not change much. For this purpose, continuous recording of the temperature must be carried out. In the event of a fault, not only does the temperature rise, but irregular changes can occur.

3) Identification by the state of the lubricant

Sampling analysis of the lubricant is judged by whether or not the degree of contamination is mixed with foreign matter or metal powder. This method is particularly effective for bearings or large bearings that cannot be placed close to the TIMKEN inlet.

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Daily maintenance precautions for TIMKEN plain bearings

After the TIMKEN bearing is installed, check the operation in order to check if the installation is correct. The small machine can be rotated by hand to confirm whether the rotation is smooth. The inspection items have poor operation due to foreign matter, scratches, and indentations. The installation is poor, the torque generated by the mounting is not stable, and the torque is too large due to too small clearance, installation error, and sealing friction. Wait. If there is no abnormality, the power running can be started. Large machinery cannot be rotated manually, so the power is cut off immediately after the start of the no-load, the machine is idling, and the presence or absence of vibration, noise, and contact of the rotating parts is checked. After confirming that there is no abnormality, the power is turned on. The power running starts from the no-load low speed and slowly increases to the rated operation of the specified conditions. The items to be checked during the test run are whether there is abnormal sound, change in the temperature of the plane bearing, leakage or discoloration of the lubricant, and the like. If an abnormality is found, stop the operation immediately, check the machine, and remove the bearing check if necessary.

The temperature can generally be estimated based on the external temperature of the bearing housing. However, it is more accurate to directly measure the temperature of the outer ring of the TIMKEN bearing by using the oil hole. The bearing temperature gradually rises from the start of the operation, and the temperature is usually stable after 1 to 2 hours. If the bearing is poorly installed, the temperature will rise sharply and an abnormally high temperature will occur. The reasons are such as excessive lubricant, too small bearing clearance, poor installation, excessive friction of the sealing device, and the like. In the case of high-speed rotation, the selection of the structure and lubrication method is also the cause.

1. Keep the bearings and their surroundings clean.

Even small dust that is invisible to the eyes can have a bad effect on TIMKEN bearings. So keep the area clean so that the dust does not intrude into the flat bearings.

2. Careful use of the bearing gives the TIMKEN bearing a strong impact during use, which can cause scratches and indentations, which are the cause of the accident. In severe cases, cracks and breaks occur, so care must be taken.

3, use the appropriate operating tools

Avoid using existing tools and use the right tools.

4, pay attention to the corrosion of the plane bearing

When operating the bearing, the sweat on the hand can cause rust. Be careful to use a clean hand, it is best to wear gloves as much as possible.

It is very important to understand that the use of TIMKEN bearings will have a multiplier effect.

When the mechanical parts near the bearing have been lubricated with oil or need to be dissipated by lubricating oil, the bearings should be lubricated with oil. There may be heat dissipation requirements when the bearing is under heavy load or high speed, or when external heat is introduced.

Micro-lubrication methods, such as drip lubrication, oil mist lubrication or oil and gas lubrication, ensure that the oil loss and bearing friction are small.

When air is used as the carrier, the oil can be supplied directly and the gas flow helps to seal.

Where the flat bearing speed is extremely high and where suburban fruit is to be cooled well, a large amount of lubricant can be sprayed directly onto all contact surfaces.

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Precautions for use of FAG tapered roller bearing lubrication device

When the bearing is installed, it can be selected according to its type and size, mechanical, heating or hydraulic. However, under no circumstances can you tap the tapered roller bearing ring, cage, rolling element or seal directly. The force applied to the FAG bearing during installation must not be transmitted from one bearing ring to the other through the rolling element, otherwise the raceway may be damaged.

First of all: The first point is two tank equipment, one for use, regular switching, spare tank cleaning, oil temperature precipitation, net oil and water.

Second, the fuel tank should be equipped with a degassing plate in the oil return zone - reduce the impact of fueling; the magnetic grid device - the iron in the oil returning zone; the floating oil suction port - the appropriate position below the liquid surface to absorb oil; the automatic drainage device or the water immersion alarm device - will precipitate Separate water to discharge in time; dynamic liquid level control - alarm or interlock for sudden large amount of oil leakage.

Third, the oil supply filtration precision is high, generally requires filtration accuracy of 10 ~ 20μm to ensure the cleanliness of the oil.

Fourth, the oil supply pressure should be kept constant, the lubrication system working pressure control device should have high sensitivity and precision, avoid the pressure drop caused by the pressure change, cause the local lubrication system to supply insufficient oil, and the oil film FAG bearing wear and sintering .

5. The volume of the fuel tank should be 35 to 40 times the displacement per minute of the oil pump, and some even larger. In the case of high oil level operation, ensure that the oil stays in the tank for a long enough time to settle.

6. The pressure tank in the lubrication system must operate normally, control the reasonable oil filling flow value and the liquid level in the tank, and play the pressure fluctuation of the partial buffer system and the supply of the emergency oil source.

7. The oil supply temperature should be controlled between 40±2°C to ensure the viscosity of the oil supply.

8. The filter must drain the residual air in the filter cartridge before switching the tapered roller bearing.

For clearance-fit tapered roller bearing rings, it is recommended to apply a thin anti-creeping etchant on the mating surface to prevent frictional corrosion between the mating surfaces.

Proper installation is very important for the use of FAG bearings. I hope that everyone can use the correct installation method in future use.

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IKO imported bearing damage analysis and maintenance should pay attention to matters

Not all damaged I bearings can be repaired, but for each damaged bearing, the cause and extent of damage must be evaluated to avoid or reduce re-damage before considering repairing or replacing a new bearing. There are many reasons for damage to imported bearings, such as improper installation, dirt intrusion or moisture intrusion, which are common causes of early damage to many imported bearings. Analysis of common causes of damage to IKO bearings and corresponding preventive measures that extend the life of IKO bearings.

A. Improper operation:

Improper installation, operation or disassembly may cause deformation or defect of the cage

Precautions: Use appropriate handling, installation and removal tools

B. Insufficient lubrication:

Insufficient or improper lubrication may result in component scratches or severe bearing deformation

Precautions: Improve the lubrication system and properly replenish or replace the lubricant at regular intervals

C. Rusty and corrosion:

Contact with water can cause the bearing components to erode and rust. Bearings after rust damage may cause spalling during work

Precautionary measures: Regularly check the seal to ensure a good sealing effect and properly store IKO bearings.

D. Current:

Energization of the IKO bearing while it is rotating may result in grooves or nicks. Improper electrical grounding can cause minor burns when the bearing is stationary

Precautions: Reduce or avoid current flow through the bearings by properly grounding the connections before parts other than IKO bearings.

E. External materials:

Abrasion particle contamination and debris intrusion may cause wear, abrasion and dents on the IKO bearing bearing face

Precautions: Remove invading particles and debris, replace lubricant, check sealing system

F. eccentric:

Eccentricity, tilting, or excessive loading can cause geometric stress concentrations or surface spalling

Precautions: Precision machining of IKO bearings and shoulders

When the IKO imported bearing equipment is regularly inspected and operated, and the bearings that have been removed during the replacement of the peripheral parts are stopped, it is necessary to determine whether the secondary IKO bearing parts can be reused and the usage status is better or worse.

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Analysis: Characteristics of NSK bearing raceway noise

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. As we all know, even if the NSK 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 will stimulate the natural vibration of the vibration system.

Although the raceway noise of the NSK bearing is unavoidable, it is possible to use high-precision machining of the working surface of the part, the correct selection of NSK bearings and the precise use of NSK bearings for noise reduction and vibration reduction.

The rolling sound is due to the rolling of the rolling elements in the raceway when the NSK bearing rotates to excite a smooth and continuous noise, which only attracts attention when its sound pressure level or tone is extremely large. In fact, the sound energy excited by the raceway sound is limited. For example, under normal conditions, the quality of the 6203NSK bearing raceway is 25~27dB. This type of noise is the most typical of single row deep groove ball bearings that can withstand radial loads. It has the following characteristics:

a. Noise and vibration are random;

b. The vibration frequency is above 1 kHz;

c. Regardless of the change in the rotational speed, the main frequency of the noise is almost constant and the sound pressure level increases as the rotational speed increases;

d. When the radial clearance increases, the sound pressure level increases sharply;

e. NSK bearing housing rigidity increases, the lower the total sound pressure level, even if the speed increases, its total sound pressure level does not increase much;

f. The higher the viscosity of the lubricant, the lower the sound pressure level, but for grease lubrication, the viscosity and shape of the soap fiber can affect the noise value.

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IKO bearing maintenance

1. Maintenance, inspection, and abnormal handling of IKO bearings In order to maintain the original performance of IKO bearings in good condition for as long as possible, maintenance, inspection, and accident prevention are required to ensure the reliability of operation and improve productivity. Economic. Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The contents include monitoring of operating conditions, replenishment or replacement of lubricants, and inspections for periodic disassembly.

As a maintenance item during operation, there are rotary sounds, vibration, temperature, and state of lubricant of IKO bearings.

2, IKO bearing damage and countermeasures Generally, if the IKO bearing is used correctly, it can be used until the fatigue life is reached. However, there will be accidents that are prematurely damaged and cannot be used. This early damage, as opposed to fatigue life, limits the quality of what is known as a fault or accident. Many of them are caused by inadvertent installation, use, and lubrication, and foreign objects intruding from the outside are insufficiently studied for the thermal effects of the shaft and the outer casing.

Regarding the damage state of the IKO bearing, for example, the jam of the ferrule rim of the roller IKO bearing can be considered as a cause of insufficient lubricant, unsuitability, defects in the oil supply structure, foreign matter intrusion, IKO bearing installation error, shaft If the deflection is too large, there will be coincidences of these reasons.

Therefore, it is difficult to know the true cause of the damage by investigating only IKO bearing damage. However, if you know the IKO bearing's use of machinery, the conditions of use, the structure around the IKO bearing, and understand the situation before and after the accident, combined with the damage state of IKO bearings and several reasons, it can prevent similar accidents from happening again.

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