Cleaning, overhaul and judgment of nsk bearings

1, the cleaning of the bearing

When disassembling the lower bearing for inspection, first record the appearance of the bearing, confirm the residual amount of the lubricant, and clean 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 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, use a brush to remove the grease and adhesive. After it is almost clean, it is transferred to the fine wash. Fine washing is to carefully clean the bearing while rotating it in the cleaning solution. In addition, the cleaning oil should always be kept clean.

2. Inspection and judgment of bearings

In order to judge whether the removed bearing can be reused, check the bearing after cleaning, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the bearing clearance and whether there is dimensional accuracy. Falling damage, abnormality. For non-separable ball bearings, use one hand to support the inner ring horizontally, and turn the outer ring to check if it is in a smooth rotation.

Separate bearings such as tapered 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, the more careful inspection is required.https://www.supplyforever.com/

Bearing material and heat treatment technical requirements

        1 The bearing ring and rolling element are made of GCr15 and GCr15SiMn bearing steel, which should meet the requirements of the drawings. Its quality requirements should meet the GB/T18254 standard.
2 The bearing ring and rolling element heat treatment standards are carried out according to JB/T1255 standard. The uniformity of hardness of the same part should be within 1HRC.
3 After the martensite quenching and tempering of the bearing ring, the microstructure should be composed of cryptocrystalline, fine crystalline martensite, uniformly distributed fine residual carbide, a small amount of retained austenite and a small amount of troostite. After quenching and tempering Microstructure requirements should be in accordance with JB/T1255.
4 Bearing ring parts of P5 grade and above shall be dimensionally stable.https://www.supplyforever.com/

Matters needing attention when measuring the radial clearance of FAG bearings

There are some things to be aware of when measuring the radial clearance of a FAG bearing.
    When selecting a FAG spherical roller bearing with a tapered bore, the interference with the bearing is required to be larger than that of the cylindrical bore. Because the radial clearance is reduced when a larger interference occurs, the reduction in radial clearance is taken into account when selecting a FAG tapered spherical roller bearing. So what is the radial clearance? How to measure it?
Radial clearance refers to the radial clearance inside the bearing, which allows the bearing to have ample internal clearance under normal conditions after tight fit assembly. Equipment that operates in a high temperature environment often requires a high temperature resistant, large clearance FAG bearing to operate accordingly. Here are some points to note when measuring the radial clearance of FAG bearings.
In the process of measuring the radial clearance of the FAG bearing, it is necessary to ensure that the ball falls into the bottom of the groove; for closed bearings, it should be measured before closing; when using the instrument to measure, the measured value should also be subtracted from the load. The amount of play increases.
When the object to be measured is a multi-row ball bearing, it is required that each column of the measured value is qualified, and then the arithmetic mean of each column is taken as the radial clearance of the FAG bearing.
When conditions permit, it is best to use special instrumental measurements.
When it is necessary to use the hand-push method to measure, the measurer is required to have a higher measurement skill, because the measurement error of this method will be large, especially when the play is in the edge state, it is easy to cause an error. At this time, the instrument measurement should be taken as the standard.
When using the feeler gauge measurement method, it should be operated according to the standard regulations. It should not be measured by rolling the roller from the feeler gauge.

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Talking about How to Guarantee the Quality of Measurement Work in Bearing Industry

Core Tip: In the process of social development, metrology is an important foundation for economic activities, national defense construction, scientific research and social development. The development of science and technology depends on the development of measurement testing technology.
In the process of social development, metrology is an important foundation for economic activities, national defense construction, scientific research and social development. The development of science and technology depends on the development of measurement testing technology, which provides reliable data for science and technology. In mechanical products, rolling bearings play an important role as precision mechanical foundations. With the development of science and technology, the accuracy level requirements for rolling bearing products are getting higher and higher, which makes the machining precision of bearing parts continuously improve. In the bearing production process, the dimensional accuracy of bearing parts is transmitted by special standard instruments. The accuracy of bearing standard instruments directly affects the accuracy of bearing product identification, and the calibration and calibration of bearing standard instruments are done. It is an important basis for ensuring the quality of bearing products. The verification and calibration of bearing standard instruments are carried out by measuring standard instruments and measuring instruments. The accuracy of measuring standard instruments and measuring instruments will be directly reflected on the standard equipment of bearings. Therefore, it is more important to do a good job in verification and calibration to ensure the quality of measurement work.
  1 Strengthen the management of instruments and measuring standard instruments
      Strengthening the management of instruments and measuring standard instruments is the basis for ensuring the quality of measurement work. First of all, instruments and measuring standard instruments should be verified and calibrated in strict accordance with the requirements of the quality manual to ensure the strict operation and accuracy of the instruments and measuring standard instruments during the validity period. Secondly, regular inspections are carried out on some instruments that are not commonly used to ensure good performance and normal operation during use. Strictly eliminate the use of measuring instruments and instruments that exceed the verification period. Furthermore, the marking and calibration of the standard measuring instruments should be selected according to the level of accuracy, such as the national metrology institute, the industrial center metering station, and the provincial metrological verification department.
      In addition, it is very important to ensure the quality of the instrument and the standard instrument. The maintenance work of the instrument and the measuring standard equipment shall be carried out regularly. The maintenance and repair work of the instrument and the measuring standard equipment shall be carried out according to the maintenance procedures in the program documents. Good maintenance work not only maintains the measurement accuracy of the standard instruments and instruments, but also prolongs its service life.
  2 Guarantee the quality of the original records and certificates for verification and calibration
   Measurement work is a scientific and rigorous work. From the verification and calibration of the original records to the issuance of certificates, every link is not sloppy. Really evidenced, complete, accurate and reliable is the most basic requirement for the original record.

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Self-aligning ball bearing failure cause and operation check work points and daily maintenance skills

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 self-aligning ball 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.

TIMKEN bearing 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 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 TIMKEN bearing structure and lubrication method is also the cause.

The rotation sound of TIMKEN bearings is checked with a stethoscope, etc., and there are strong metal noise, abnormal sounds, irregular sounds, etc. to explain abnormalities. The reasons are poor lubrication, poor accuracy of the shaft or housing, bearing damage, and foreign matter intrusion.

The surface of the steel under transient high temperature acts on the oxygen in the air and rises into a very thin (20-30 nm) thin layer of iron oxide. It is worth noting that the thickness of the oxide layer is corresponding to the test results of the total thickness of the surface-grinding metamorphic layer. This shows that the thickness of the oxide layer is directly related to the grinding process and is an important indicator of the quality of the grinding.

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Principles and functions of grease in NTN bearings

Our customers always have some improper use methods when using all kinds of NTN bearing grease. Today we will explain the principle and function of the grease in the bearing.

1, the principle of the use of grease

Everyone is a liquid solution that is a very thick solution. This grease is composed of a reticulated soap fiber whose structure determines that it can adsorb a large amount of lubricating oil and make it work properly. But as you can imagine, if a sponge is squeezed, the water will flow out. Grease is also squeezed out of the lubricating oil, but the grease in the NTN bearing is rarely directly squeezed and drained, because a freshly lubricated imported bearing is moving in the inner space of the bearing during running. Its main working principle is "temperature".

2, the practical function of grease

The main reason for draining grease to the sliding surface is the increase in temperature of the grease around the NTN bearing. When the bearing starts to run normally, the grease will reach the sliding friction surface. Lubrication begins to work as the temperature increases.

Advantages of NTN imported bearings with grease lubrication:

1) Individual bearing points must be refueled by hand. If the grease is used, it will save trouble and avoid accidents caused by lack of oil.

2) The grease itself has a sealing effect, which allows the use of a mechanism with a low degree of sealing to achieve a simplified design.

3) Experience has shown that lithium grease lubrication has a lower temperature rise and longer bearing life than a drop method in a certain speed range (n<20000r/min or dn<20000mm.r/min).

2, NTN imported bearing lubrication theory basis: the lubrication mechanism of the bearing is the theory of elastic fluid dynamic pressure lubrication.

3. NTN bearing failure type and lubrication relationship: Most of the failure causes are caused by faults in the assembly and poor sealing. A small number of failures are caused by wear, gluing, corrosion and overheating due to lack or excess of lubricant or quality failure.

4. Basic characteristics of grease and general criteria for selecting grease:

When selecting grease, you must choose the conditions of use (temperature, speed, load。

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Cleaning, overhaul and judgment of nsk bearings

1, the cleaning of the bearing

When disassembling the lower bearing for inspection, first record the appearance of the bearing, confirm the residual amount of the lubricant, and clean 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 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, use a brush to remove the grease and adhesive. After it is almost clean, it is transferred to the fine wash. Fine washing is to carefully clean the bearing while rotating it in the cleaning solution. In addition, the cleaning oil should always be kept clean.

2. Inspection and judgment of bearings

In order to judge whether the removed bearing can be reused, check the bearing after cleaning, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the bearing clearance and whether there is dimensional accuracy. Falling damage, abnormality. For non-separable ball bearings, use one hand to support the inner ring horizontally, and turn the outer ring to check if it is in a smooth rotation.

Separate bearings such as tapered 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, the more careful inspection is required.

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IKO tapered roller bearing vibration maintenance detection method

Maintaining the bearing is a necessary condition for the operation of the tapered roller bearing. The common maintenance is to lubricate the IKO bearing. When reading how to select the lubrication method of the bearing, under the premise of understanding the lubrication mode of the bearing, it is also known to the maintenance of the bearing system. It is necessary to let us see how to carry out bearing lubrication maintenance.

1. Keep the bearing lubricated clean

Before inspecting the tapered roller bearing, the surface of the bearing should be cleaned first, and then the oil seal of the bearing and its surrounding parts should be carefully inspected. If there are any bad symptoms, be sure to replace it. The bad oil seal will cause damage, making IKO The bearing cloud is not normal and the equipment is shut down.

2. Pay attention to cover exposed bearings

When inspecting tapered roller bearings, do not expose the bearings to contaminants or moisture. If the work is interrupted, the machine should be covered with a piece of oil-paper plastic or similar material. If the unshielded bearing is cleaned without performing disassembly and may be inspected, use a brush for application to clean with a petroleum solvent, then dry it with a lint-free cloth or blow it with compressed air (be careful not to let The bearing assembly starts to rotate). Check the track surface, retainers and beads of the IKO bearing with a small mirror and a probe similar to that used by dentists. Do not clean the bearing with a sealing cover or dustproof; just wipe the outer surface. If the bearing is damaged, it needs to be replaced. Replacing bearings during regular downtime maintenance is far more economical than the loss of sudden downtime selected due to damage to the array.

3. Check the lubricant of the bearing

Lubricants are important not only for bearings but also for all bearings. However, please note that it is not advisable to add too much grease to tapered roller bearings. Then it is to replace the lubricant of the bearing. Bearings lubricated with oil should be refilled with fresh oil and allowed to rotate at low speed for a few minutes if the old oil is drained. As much as possible, allow the oil to collect the contaminants from the wreckage and then vent the oil. For grease-lubricated IKO bearings, when replacing grease, the cutter used should avoid any contact with the cotton material in any part of the bearing. Since these residual fibers may be wedged between the rolling elements and cause damage, in particular the application of the bearing needs to pay attention to this problem.

When the waviness of the component is closely matched between the bearing ring and the bearing housing or the transmission shaft, the bearing ring may be deformed in cooperation with the shape of the adjacent component. If deformation occurs, vibration may occur during operation. Therefore, it is important to machine the housing and drive shaft to the required tolerances.

Local damage A small number of bearing raceways and rolling elements may be damaged due to handling or installation errors. In operation, rolling a damaged bearing component produces a specific vibration frequency. Vibration frequency analysis identifies damaged bearing components. Vibration Behavior in Applications In many applications, the stiffness of an IKO bearing is the same as the stiffness of the surrounding structure. Due to this feature, it is possible to reduce the vibration in the application as long as the bearings (including preload and clearance) are properly selected and their configuration in the application.

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Proper maintenance and use of TIMKEN bearings

1. Installation of TIMKEN bearings

Whether the TIMKEN bearing is installed correctly affects accuracy, life and performance. Therefore, the design and assembly department should fully study the installation of TIMKEN bearings. I hope to install according to the operating standards. The items of the job standard are usually as follows:

(1) Cleaning bearings and bearing related parts

(2) Check the size and finishing of the connected parts

(3) Installation

(4) Inspection after mounting the bearing

(5) Supply lubricant

2, TIMKEN bearing alignment and alignment

After the TIMKEN bearing is installed, alignment may result in additional loads, friction and vibration of the bearing if not carefully aligned. 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.

3. Basic condition monitoring of TIMKEN bearings

During use, the basic external conditions of TIMKEN bearing operation, such as temperature, vibration and noise measurements, are often monitored. These regular inspections will identify potential problems early and will prevent unexpected machine stops, enabling production plans, increased plant productivity and efficiency.

4. Relubricate the TIMKEN bearing

During operation, the bearing is required to have the correct relubrication to perfect its performance. The method of bearing lubrication is divided into grease lubrication and oil lubrication. In order to make the bearing function well, first, choose a lubrication method that suits the conditions of use and the purpose of use. Lubricity of oil lubrication predominates if only lubrication is considered. However, grease lubrication has the advantage of simplifying the structure around the bearing.

5, TIMKEN bearing unloading

When the TIMKEN bearing will reach its end of life, it should be replaced.

Although the TIMKEN bearing can no longer be used, correctly removing the original bearing and replacing the new bearing in time can promote the service life of the new bearing.

First, the use of a suitable method of removal of the tool will help prevent damage to other machine components;

Second, techniques that are improperly removed can be hazardous to the operator.

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Proper maintenance and use of TIMKEN bearings

1. Installation of TIMKEN bearings

Whether the TIMKEN bearing is installed correctly affects accuracy, life and performance. Therefore, the design and assembly department should fully study the installation of TIMKEN bearings. I hope to install according to the operating standards. The items of the job standard are usually as follows:

(1) Cleaning bearings and bearing related parts

(2) Check the size and finishing of the connected parts

(3) Installation

(4) Inspection after mounting the bearing

(5) Supply lubricant

2, TIMKEN bearing alignment and alignment

After the TIMKEN bearing is installed, alignment may result in additional loads, friction and vibration of the bearing if not carefully aligned. 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.

3. Basic condition monitoring of TIMKEN bearings

During use, the basic external conditions of TIMKEN bearing operation, such as temperature, vibration and noise measurements, are often monitored. These regular inspections will identify potential problems early and will prevent unexpected machine stops, enabling production plans, increased plant productivity and efficiency.

4. Relubricate the TIMKEN bearing

During operation, the bearing is required to have the correct relubrication to perfect its performance. The method of bearing lubrication is divided into grease lubrication and oil lubrication. In order to make the bearing function well, first, choose a lubrication method that suits the conditions of use and the purpose of use. Lubricity of oil lubrication predominates if only lubrication is considered. However, grease lubrication has the advantage of simplifying the structure around the bearing.

5, TIMKEN bearing unloading

When the TIMKEN bearing will reach its end of life, it should be replaced.

Although the TIMKEN bearing can no longer be used, correctly removing the original bearing and replacing the new bearing in time can promote the service life of the new bearing.

First, the use of a suitable method of removal of the tool will help prevent damage to other machine components;

Second, techniques that are improperly removed can be hazardous to the operator.

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Application of NSK Bearings in Construction Machinery Industry

There are many types and types of construction machinery and equipment. The main types are: forklifts, earthmoving machinery, compaction machinery, concrete machinery, etc.

Many modern large-scale construction machinery, such as asphalt mixing equipment, stabilized soil mixing equipment, and combined crushers, are large in scale. Each part has a quality of several tens to hundreds of tons, and most of the construction machinery is in sediment, gravel, and rain. In the harsh environment such as wind and snow, the technical condition will inevitably fall faster than other machinery. The fitting between the parts will have different degrees of looseness, wear, rust and scaling. The mating properties of the joints and the mutual position of the parts Relationships and coordination of institutional work will be affected to varying degrees, causing performance indicators such as power, economy, and reliability to decline, and even cause machine accidents. Therefore, we must pay attention to the selection and maintenance of parts in engineering machinery, especially NSK bearings. A high-quality NSK bearing can improve the working life of construction machinery, improve work efficiency, and thus improve economic efficiency.

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