New method of SKF imported bearing heating assembly
New method of SKF imported bearing heating assembly
2022年4月27日
Anti rust management and new anti rust technology of Koyo bearing
Anti rust management and new anti rust technology of Koyo bearing
2022年5月2日

Key points of operation inspection after IKO bearing installation

  • As we all know, ina bearings are at the forefront of the world in terms of sales, quality and quality. With its professional production line, ina bearings are sold all over the world after strict factory inspection, providing support for the industrial development of the world. The quality of ina imported bearings is an important basis for it to win market recognition. So from what aspects can we judge the quality of ina imported bearings?Effect of cleanliness on service performance of NTN imported bearings

First, the industrial design of the bearing is reasonable and perfect.

  • with the world level, and the strong quality ensures its service life. INA Bearing forging must go through rigorous processes such as forging, bearing heat treatment, turning, grinding and bearing equipment. Various processing processes will affect the service life of the bearing. Key points of operation inspection after IKO bearing installation
  • The impact on the quality of finished ina imported bearings is directly related to the failure of ina bearings. With the continuous progress of scientific and technological inspection, ina bearing surface inspection found that the grinding process of metamorphic layer is closely related to the quality of ina bearing surface.Key points of operation inspection after IKO bearing installation
  • Second, the metal lottery used in INA Bearing manufacturing was once a major factor affecting bearing failure. Now, with the continuous progress of metallurgical technology, the extraction of raw materials has been well improved, and the quality of materials has been greatly improved. Now the quality factor of raw materials has decreased significantly in bearing failure. Key points of operation inspection after IKO bearing installation

At this stage, this problem still exists,bearing installation

  • Third, whether the material selection of bearing manufacturing is qualified or not is also a factor that must be considered for bearing failure. In the detection of INA Bearing Failure, it is mainly to find out and solve the main factors of ina bearing failure according to a large number of Beijing materials, data analysis, failure environment and forging process, so as to facilitate the continuous optimization, service life and efficiency improvement of INA Bearing. Extend the service life of INA Bearing to avoid sudden early failure of bearing. The installation condition is one of the primary factors in the use factors.Key points of operation inspection after IKO bearing installation
  • The improper installation of INA Bearing often leads to the change of the stress state between the parts of the whole INA Bearing, and the INA Bearing operates in an abnormal state and fails early. According to the technical requirements of ina bearing installation, use, maintenance and repair, monitor and inspect the load, speed, working temperature, vibration, noise and lubrication conditions borne by the running bearing, find out the cause immediately and adjust it to make it return to normal.Key points of operation inspection after IKO bearing installation
  •  The normal temperature of Koyo bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are appropriate, the bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.Key points of operation inspection after IKO bearing installation
  • The working temperature of Koyo bearing can be monitored at any time by using the thermal sensor, and the automatic alarm or stop when the temperature exceeds the specified value can be realized to prevent the occurrence of combustion shaft accident.Key points of operation inspection after IKO bearing installation
  • High temperature often indicates that Koyo bearing has been in abnormal condition. High temperature is also harmful to the lubricant of Koyo bearing. Sometimes bearing overheating can be attributed to the lubricant of the bearing. If the temperature of the bearing exceeds 125 ℃ for a long time, the service life of the bearing will be reduced. Key points of operation inspection after IKO bearing installation

The causes of high temperature bearings include insufficient or excessive lubrication and lubricant.

  •  It contains impurities, excessive load, bearing ring damage, insufficient clearance, high friction caused by oil seal, etc.Effect of cleanliness on service performance of NTN imported bearings
  • 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 remain unchanged, any temperature change can indicate that a fault has occurred.Three criteria for judging the failure of ina imported bearings
  • The periodic measurement of Koyo bearing temperature can be aided by thermometer, such as Koyo bearing digital thermometer, which can accurately measure the bearing temperature and display it in ℃ or Fahrenheit.Key points of operation inspection after IKO bearing installation
  • The important Koyo bearing means that when it is damaged, it will cause the shutdown of the equipment. Therefore, this kind of bearing should be equipped with temperature detector.Three criteria for judging the failure of ina imported bearings.Key points of operation inspection after IKO bearing installation

Under normal circumstances, bearing installation

  • Koyo bearings will have a natural temperature rise after just lubrication or re lubrication and last for one or two days.Three criteria for judging the failure of ina imported bearings
  • Second, check the sound condition of NTN imported bearing during rolling. Because NTN imported bearing will emit abnormal sound and irregular sound even if there is slight peeling and other damage, it can be distinguished with a sound detector. The sound detector is used to check the rolling sound and sound quality of NTN imported bearing in operation, so as to prevent it in advance.Key points of operation inspection after IKO bearing installation
  • Third, check the temperature of NTN inlet bearing during rotation. It is more appropriate if the outer ring temperature of NTN inlet bearing can be directly measured by oil hole. Generally, the temperature of NTN inlet bearing can be inferred based on the temperature outside the NTN inlet bearing chamber. If the lubrication and installation parts are appropriate, the temperature of NTN inlet bearing will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.Key points of operation inspection after IKO bearing installation
  • Generally, the temperature of NTN imported bearing rises slowly with the start of operation and reaches a stable state after 1-2 hours. The normal temperature of NTN imported bearing varies with the heat capacity, heat dissipation, speed and load of the machine.Key points of operation inspection after IKO bearing installation
  • Check the axle and find out the faults existing in Peilin before long-distance or race. In the early stage, when Peilin lubrication is seriously deteriorated, eliminate these faults in advance for lubrication or replacement, so as to avoid affecting the level of play due to hardware problems, which is very important for professional drivers and amateur drivers.Key points of operation inspection after IKO bearing installation
  • Touch is a very simple method. In industry, the lubrication problem of Peilin can lead to high temperature, which can be felt by hand. This high temperature will be harmful to the lubricant in Peilin. It is difficult for the bicycle to rotate at that high speed, or even reach the ground that makes Peilin hot.Key points of operation inspection after IKO bearing installation
  •  The inspection touch of the bicycle is only the axis of the flower drum rotating with the hand mold, which can feel the situation inside, The vibration indicates that there are pits or the beads are not round, and the quicksand feeling is the lack of good lubrication. If the rotation is astringent and stuck, it indicates that the oil is dry or the wrong device has caused Peilin to be misaligned and too tight.Key points of operation inspection after IKO bearing installation

The observation is mainly aimed at the appearance of Peilin to see whether the rubber seal has been broken. 

  • Open the rubber seal to check whether the lubricating oil is dry. Blackening means that the lubricating oil is polluted or carbonized. Whiteness and turbidity indicates water inflow. In this case, the earlier it is found, the smaller the damage after oil change. However, the long-term use of such oil can cause irreversible damage to Peilin.Key points of operation inspection after IKO bearing installation
  • The low whine or whine of NTN means that the stethoscope is not working normally.Key points of operation inspection after IKO bearing installation
  • The sharp chirp may be caused by improper lubrication, which causes metal friction, while the hissing sound may be the pollution of lubricating oil. The irregular noise is caused by the vibration caused by the indentation of the raceway. In the absence of an electronic stethoscope, the bicycle has a very simple method. Put a wooden stick on the front fork or rear fork and turn it. Key points of operation inspection after IKO bearing installation
  • This method can also be used for the center axle, but it is difficult to judge because the sound of the center axle will be mixed with the rear axle. There are two kinds of lubricants commonly used in Koyo bearings: lubricating oil and grease. When the circumferential speed of the shaft is less than 4-5m / s, or the parts on the vehicle that cannot be lubricated with lubricating oil, they shall be lubricated with grease.Key points of operation inspection after IKO bearing installation
  • The advantage of grease lubrication is that the sealing structure is simple, the grease is not easy to lose, and it is not affected by temperature. Adding grease once can be used for a long time.Key points of operation inspection after IKO bearing installation

 

Two problems should be paid attention to when using grease.

  •  One is to select the appropriate brand of grease according to the requirements of the automobile manual. For example, nano base grease should not be selected for automobile water pump bearing because of its poor water resistance. The second is to add an appropriate amount of lubricating grease into the Koyo bearing. Key points of operation inspection after IKO bearing installation
  • Generally, it is appropriate to fill only 1 / 2-L / 3 of the cavity of the Koyo bearing. Too much is not only useless, but also increases the running resistance of the Koyo bearing and heats it up. Special attention should be paid to the automobile hub bearing. It is necessary to advocate “empty hub lubrication”, that is, only apply an appropriate layer of grease on the Koyo bearing. Otherwise, it will not only waste and poor heat dissipation, but also overflow the grease by heating, which may affect the braking performance.Key points of operation inspection after IKO bearing installation
  • The advantage of lubricating oil lubrication is low friction resistance and heat dissipation. It is mainly used for Koyo bearings with high speed and high working environment temperature. The brand of lubricating oil shall be selected according to the requirements of the vehicle manual, and shall be replaced in time after the vehicle maintenance cycle. Key points of operation inspection after IKO bearing installation

After discharging the old oil, the mechanism shall be cleaned before adding new oil. 

  • The oil shall be added to the specified marking line or flush with the oil filler (depending on the specific structure and requirements of the vehicle), and no more oil shall be added.Key points of operation inspection after IKO bearing installation
  • The assembly accuracy of cage is guaranteed by special assembly mould, which can fully meet the assembly accuracy requirements of Koyo bearing. The condition of small interference fit for the fixed ring is that both sides of the matching surface have high shape accuracy and small roughness, otherwise it will be difficult to install and more difficult to disassemble. In addition, the influence of thermal elongation of the main shaft needs to be considered.Key points of operation inspection after IKO bearing installation
  • Surface heat treatment is divided into two categories. One is surface quenching and tempering heat treatment, which uses vibration absorption or vibration isolation devices to reduce Koyo bearing noise or isolate Koyo bearing noise. The other is chemical heat treatment.Key points of operation inspection after IKO bearing installation
  • ts hardness test method is as follows: chemical heat treatment is to make the workpiece surface infiltrate atoms of one or more chemical elements, so as to change the chemical composition, organization and performance of the workpiece surface. Key points of operation inspection after IKO bearing installation
  • After quenching and low temperature tempering, the workpiece surface has high hardness, wear resistance and contact fatigue strength, and the core of the workpiece has high strength and toughness.Key points of operation inspection after IKO bearing installation
  • The main technical parameters of chemical heat treatment workpiece are hardened layer depth and surface hardness. The depth of hardened layer shall be checked by Vickers hardness tester. Check the distance from the workpiece surface to the point where the hardness drops to 50HRC. Three criteria for judging the failure of ina imported bearings
  • This is the effective hardening depth. The surface hardness inspection of chemical heat treatment workpiece is similar to that of surface quenching heat treatment workpiece. One kind of rolling bearing noise is generated by Koyo bearing itself. It can be inspected with Vickers hardness tester, surface Rockwell hardness tester or Rockwell hardness tester, but the thickness of nitriding thickness is thin, generally no more than 0.7mm. Key points of operation inspection after IKO bearing installation
  • At this time, Rockwell hardness tester can no longer be used. If the local hardness requirements of parts are high, local quenching heat treatment can be carried out by means of induction heating. For such parts, the location of local quenching heat treatment and local hardness value shall be marked on the drawing. The hardness inspection of parts shall be carried out in the designated area. Rockwell hardness tester can be used to test HRC hardness value. Unbalanced rotating torque – cause: incorrect installation, installation error, etc.Key points of operation inspection after IKO bearing installation
  • Timken bearing for large machinery that cannot be turned by hand, it can be started under no-load state first, and then turn off the power immediately for inertial operation. At this time, after confirming that there is no abnormal vibration or noise and the rotation is normal, enter the power operation.Three criteria for judging the failure of ina imported bearings.Key points of operation inspection after IKO bearing installation
  • When entering power operation, start at low speed and no load and gradually reach the specified operating conditions. The power operation inspection is mainly based on the sound, temperature rise and vibration. The cause shall be found out immediately, and the one-way bearing shall be removed for inspection when necessary.Key points of operation inspection after IKO bearing installation
  • For the one-way sound inspection of Timken bearing, generally, a sound stick can be used.Three criteria for judging the failure of ina imported bearings
  • The temperature inspection of one-way bearing can generally be speculated according to the shell temperature, but it is correct to directly measure the temperature of the outer ring of one-way bearing by using oil hole, etc.Three criteria for judging the failure of ina imported bearings
  • The grinding layer, high-temperature layer and two-layer quenching of Timken bearing are treated in molten state. The molten metal molecular flow is evenly coated on the working surface and cooled by the base metal at a very fast speed to form an extremely thin amorphous structure layer. It has high hardness and toughness, but it is only about 10nm, which is easy to be removed in precision grinding.Three criteria for judging the failure of ina imported bearings
Key points of operation inspection after IKO bearing installation

IKO bearing installation ibration of SKF Bearing

  • Bearing vibration is very sensitive to the damage of SKF Bearing, such as peeling, indentation, corrosion, crack, wear, etc. will be reflected in the vibration measurement of SKF Bearing. Therefore, the vibration can be measured by using a special SKF imported bearing vibration meter (frequency analyzer, etc.), and the specific abnormal situation can not be inferred by frequency division. The measured values are different due to the service conditions of SKF Bearing or the installation position of sensor, so it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.Key points of operation inspection after IKO bearing installation
  • Temperature of SKF Bearing
  • The temperature of the bearing can generally be inferred from the temperature outside the SKF inlet bearing chamber. It is more appropriate if the outer ring temperature of the SKF inlet bearing can be directly measured by using the oil hole.Key points of operation inspection after IKO bearing installation
  • Generally, the temperature of SKF imported bearing starts to rise slowly with the operation of SKF imported bearing, and reaches a stable state after 1-2 hours. The normal temperature of SKF imported bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are appropriate, the SKF Bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.Key points of operation inspection after IKO bearing installation
  • Using the thermal sensor, the working temperature of SKF Bearing can be monitored at any time, and the automatic alarm or stop when the temperature exceeds the specified value can be realized to prevent the occurrence of combustion shaft accident.Key points of operation inspection after IKO bearing installation

High temperature often indicates that SKF Bearing has been in abnormal condition. 

  • High temperature is also harmful to the lubricant of the bearing. Sometimes bearing overheating can be attributed to the lubricant of the bearing. If the temperature of SKF Bearing exceeds 125 ℃ for a long time, the service life of the bearing will be reduced. The causes of high temperature SKF imported bearings include insufficient or excessive lubrication and lubricant. It contains impurities, excessive load, SKF imported bearing ring damage, insufficient clearance, high friction caused by oil seal, etc.Key points of operation inspection after IKO bearing installation
  • Therefore, it is necessary to continuously monitor the temperature of SKF Bearing, whether it is measuring the bearing itself or other important parts. If the operating conditions remain unchanged, any temperature change can indicate that a fault has occurred.
  • The periodic measurement of SKF imported bearing temperature can be aided by thermometer, such as digital thermometer, which can accurately measure the bearing temperature and display it in ℃ or Fahrenheit. Important bearing means that when it is damaged, it will cause equipment shutdown. Therefore, this kind of SKF imported bearing should be equipped with temperature detector.Key points of operation inspection after IKO bearing installation
  • Under normal circumstances, SKF imported bearings will have a natural temperature rise after just lubrication or re lubrication and last for one to two days.Key points of operation inspection after IKO bearing installation

SF-2 boundary lubrication Timken IKO bearing installation

  • Acid polyoxymethylene has high wear resistance. Timken imported bearing surface is regularly arranged with oil storage pits. It must be coated with lubricating grease during assembly. It is especially suitable for rotating motion, rocking motion under high load and low speed, and parts that are often opened and closed under load and are not easy to form fluid lubrication. Key points of operation inspection after IKO bearing installation
  • Under boundary lubrication conditions, it can be used for a long time without refueling and maintenance, Refueling in the process can prolong the service life of bearings. At present, it is applicable to metallurgical machinery, mining machinery, water conservancy machinery, auto parts, construction machinery, agricultural machinery, etc.Key points of operation inspection after IKO bearing installation
  • Traditional oil containing Timken imported bearings
  • Due to the advantages of low noise and self lubrication, oil bearing has become a new favorite of computer CPU fan bearing, with large market demand; In addition, with people’s higher and higher requirements for noise, the application of oil containing Timken imported bearings in daily household appliances is also expanding.Key points of operation inspection after IKO bearing installation

Oil free self-lubricating Timken imported bearing

  • It is made of steel plate as the matrix, spherical bronze powder sintered in the middle layer, and the mixture of polytetrafluoroethylene and lead rolled on the surface layer. It has low friction coefficient, wear resistance and corrosion resistance It has the characteristics of oil-free self lubrication and long service life. Using it can reduce the cost, reduce the noise and prevent sticking and sliding. Key points of operation inspection after IKO bearing installation
  • It is widely used in the sliding parts of various machines, such as printing press, textile machine, hydraulic carrier, tobacco machine, machinery, fitness device, micro motor, automobile, motorcycle and so on.Key points of operation inspection after IKO bearing installation
  • The selection of suitable materials for manufacturing rolling bearings will have a great impact on its service performance and service life. The basic requirements of Timken imported bearings for materials largely depend on the working performance of Timken imported bearings. Generally, the space where IKO bearings can be installed is limited.Key points of operation inspection after IKO bearing installation
  •  In most cases, the shaft diameter (or bearing inner diameter) is limited by mechanical design or other design. Therefore, the type and size of IKO bearing are determined according to the inner diameter of IKO bearing. Therefore, the main dimension tables of standard IKO bearings are prepared according to the international standard inner diameter dimensions.Key points of operation inspection after IKO bearing installation
  • There are many sizes and forms of standard bearings. Standard IKO bearings are used in the design of mechanical devices. The nature, size and direction of the load of IKO bearings and the load imposed on the bearings are changeable. In general, the rated base load is shown on the dimension table. However, axial load and radial load are also important factors in selecting suitable IKO bearings.Key points of operation inspection after IKO bearing installation
  • When the sizes of ball and needle roller bearings are the same, needle roller bearings usually have high load capacity and bear large vibration and impact loads.Key points of operation inspection after IKO bearing installation
  • After the installation of IKO bearing, in order to check whether the installation is correct, operation inspection shall be carried out. Small machinery can be rotated by hand to confirm whether it rotates smoothly. The inspection items include poor operation caused by foreign matters, scars and indentation, unstable torque caused by poor installation and poor processing of mounting base, excessive torque caused by too small clearance, installation error and sealing friction, etc. If there is no abnormality, the power operation can be started.Key points of operation inspection after IKO bearing installation
  • Large machinery cannot rotate manually, so the power shall be cut off immediately after no-load start, and the machinery idles. Check whether there is vibration, noise, contact of rotating parts, etc. after confirming that there is no abnormality, enter the power operation.Key points of operation inspection after IKO bearing installation
  • Power operation, starting from no-load and low speed, slowly increase to the rated operation under the specified conditions. During the test run, the inspection items are whether there is abnormal sound, IKO bearing temperature change, lubricant leakage or discoloration, etc. If any abnormality is found, stop the operation immediately, check the machinery, and remove the bearing for inspection if necessary.Key points of operation inspection after IKO bearing installation
  • The temperature of IKO bearing can generally be inferred from the external temperature of bearing pedestal. However, it is more accurate to directly measure the temperature of the bearing outer ring by using the oil hole. The bearing temperature rises gradually from the beginning of operation, and the temperature is usually stable after 1 ~ 2 hours.Key points of operation inspection after IKO bearing installation
  • If the bearing is not installed properly, the temperature will rise sharply, resulting in abnormal high temperature. The reasons are too much lubricant, too small bearing clearance, poor installation, excessive friction of sealing device, etc. In the case of high-speed rotation, the wrong choice of IKO bearing structure and lubrication mode is also the reason.Key points of operation inspection after IKO bearing installation
  • The rotating sound of IKO bearing is checked with stethoscope, and there are strong metal noise, abnormal sound, irregular sound and other indications of abnormality. The reasons are poor lubrication, poor accuracy of shaft or bearing seat, bearing damage, foreign matter intrusion, etc.Key points of operation inspection after IKO bearing installation