Method of prolonging the service life of IKO imported bearings
Method of prolonging the service life of IKO imported bearings
2022年4月24日
Analysis on characteristics and common problems of SKF imported bearings
Analysis on characteristics and common problems of SKF imported bearings
2022年4月25日

Precautions for the use of ina imported bearings

  • If the ina bearing assembly surface and the matched part surface have bumps, rust layers, wear debris, sand particles, dust and soil, one is that the bearing installation is difficult, resulting in the incorrect assembly position; Second, these attachments form abrasives and are easy to wear the working surface of the bearing, affecting the assembly quality. Precautions for the use of ina imported bearings
  • Therefore, before installation, carefully inspect the surface of journal, bearing housing hole, shoulder end face and the mating surface of connecting parts such as bushing, washer and end cover. If there is any rust layer, file it off with a fine file and polish it with a fine abrasive cloth. At the same time, remove the attachments on the bearing assembly surface and its connecting parts.Precautions for the use of ina imported bearings

Use of ina imported bearings

  • Precautions for use: rolling bearing is a precision component, and its use must be carried out with corresponding caution. No matter how high-performance bearings are used, if they are not used properly, the expected high performance will not be obtained. Precautions for the use of bearings are as follows:Precautions for the use of ina imported bearings
  • Keep the bearing and its surroundings clean. Even small dust that cannot be seen by the eyes will affect the bearing. Therefore, keep the surrounding clean so that the dust will not invade the bearing.Precautions for the use of ina imported bearings
  • Use with care. Strong impact on the bearing during use will produce scars and indentation, which will become the cause of the accident. In serious cases, it will crack and fracture, so we must pay attention to it.Precautions for the use of ina imported bearings
  • Use appropriate operating tools. Avoid replacing with existing tools, and appropriate tools must be used. Such as special sleeve, press, etc.Precautions for the use of ina imported bearings
  • Pay attention to the corrosion of the bearing. When operating the bearing, the sweat on the hand will become the cause of rust. Pay attention to operate with clean hands and try to wear gloves.Precautions for the use of ina imported bearingsPrecautions for the use of ina imported bearings
  • Do not unpack the bearing before the installation preparation is completed to avoid pollution.
  • When considering the load factor, it should be noted that the service life of the bearing is more sensitive to the load than the speed. Therefore, for the multi-stage transmission shaft, if possible, the larger deceleration should be placed in the later stage; Precautions for the use of ina imported bearings
  • For the main shaft bearing, if possible, properly adjust the distance between the external load action point and the INA Bearing fulcrum, strive to reduce the load of the main shaft INA Bearing, and strive to ensure that the load transmitted to the main shaft ina bearing is stable and avoid impact and vibration. This requires that the shape and position accuracy of the bearing installation part is high enough, the clearance and fit of the ina bearing are selected correctly, and the installation accuracy of the ina bearing is good.Precautions for the use of ina imported bearings
  • The more the calculated load of INA Bearing selected in the type selection design can represent the actual load of bearing during operation, the more correct the calculation result is. Therefore, it is necessary to study the actual load of INA Bearing extensively and deeply.Precautions for the use of ina imported bearings
  • If ina bearing not only bears a large load, but also stands still without rotation, this state is more unfavorable. A small indentation will be formed between the rolling element and the raceway and will soon develop into pitting corrosion, resulting in early failure of the bearing. In this case, it is necessary to verify whether the rated static load of the selected ina bearing can exceed the equivalent static load of the INA Bearing.Precautions for the use of ina imported bearings
  • The installation space of SKF Bearing can be accommodated in the bearing installation space. Because the rigidity and strength of the shaft are paid attention to when designing the shaft system, the shaft diameter, i.e. the inner diameter of the bearing, is generally determined first. However, rolling bearings have a variety of size series and types, and the appropriate bearing type should be selected from them.Precautions for the use of ina imported bearings
  • The type of bearing with the required rotation accuracy. The spindle of machine tool, gas turbine and control machine require high rotation accuracy, high speed and low friction respectively. At this time, SKF bearings with accuracy above grade 5 should be used.Precautions for the use of ina imported bearings
  • The installation and disassembly frequency and methods of regular inspection of installation and disassembly. When the installation and disassembly are frequent, the cylindrical roller bearing with separable inner ring and outer ring, needle roller bearing and tapered roller bearing are more convenient. Tapered hole self-aligning ball bearings and tapered hole self-aligning roller bearings can be easily assembled and disassembled by using fasteners or withdrawal sleeves.Precautions for the use of ina imported bearings
  • The size, direction and nature of load bearing load are rich in changes, such as the size of load, whether there is only radial load, whether the axial load is one-way or two-way, the degree of vibration or impact, etc. After considering these factors, choose the appropriate SKF Bearing type.Precautions for the use of ina imported bearings
Precautions for the use of ina imported bearings
  • The more the calculated load of INA Bearing selected in the type selection design can represent the actual load of bearing during operation, the more correct the calculation result is. 

Therefore,study the actual load of  imported bearings 

  • If ina bearing not only bears a large load, but also stands still without rotation, this state is more unfavorable. A small indentation will be formed between the rolling element and the raceway and will soon develop into pitting corrosion, resulting in early failure of the bearing. In this case, it is necessary to verify whether the rated static load of the selected ina bearing can exceed the equivalent static load of the INA Bearing.Precautions for the use of ina imported bearings
  • The other extreme case is just the opposite. INA Bearing operates at high speed, but does not bear load. In this way, the rolling element often slides on the raceway without rolling, resulting in the rapid rise of INA Bearing Temperature, the decomposition and deterioration of lubricant, and the INA Bearing will also fail quickly. Therefore, INA Bearing needs a small load to prevent slipping.Precautions for the use of ina imported bearings
  • In many cases, the actual load of INA Bearing increases significantly due to the influence of vibration. When the coaxiality error of ina bearing is large (misalignment), the actual load of INA Bearing will also increase. Therefore, the value of calculated load must be corrected.Precautions for the use of ina imported bearings
  • In some cases, the axial force and radial force generated by the equipment itself, the weight of parts such as gears and even the weight of the shaft, and the stress of relevant parts must also be considered. They are all calculated in the afterload and load borne by the bearing, which are often easy to be ignored and omitted. The following table lists the main analysis items: analysis item selection method
  • For the type of bearing whose rigidity can meet the rigidity required by the mechanical shaft system, in the machine tool spindle and automobile final reducer, while improving the rigidity of the shaft, we must also improve the rigidity of the bearing. The deformation of roller bearing under load is smaller than that of ball bearing. Applying preload (negative clearance) to the bearing can improve the rigidity. This method is suitable for angular contact ball bearings and tapered roller bearings.Precautions for the use of ina imported bearings
  • The installation space of SKF Bearing can be accommodated in the bearing installation space.

  • Because the rigidity and strength of the shaft are paid attention to when designing the shaft system, the shaft diameter, i.e. the inner diameter of the bearing, is generally determined first. However, rolling bearings have a variety of size series and types, and the appropriate bearing type should be selected from them.Precautions for the use of ina imported bearings
  • The type of bearing with the required rotation accuracy. The spindle of machine tool, gas turbine and control machine require high rotation accuracy, high speed and low friction respectively. At this time, SKF bearings with accuracy above grade 5 should be used.Precautions for the use of ina imported bearings
  • The installation and disassembly frequency and methods of regular inspection of installation and disassembly. When the installation and disassembly are frequent, the cylindrical roller bearing with separable inner ring and outer ring, needle roller bearing and tapered roller bearing are more convenient. Tapered hole self-aligning ball bearings and tapered hole self-aligning roller bearings can be easily assembled and disassembled by using fasteners or withdrawal sleeves.Precautions for the use of ina imported bearings
  • The size, direction and nature of load bearing load are rich in changes, such as the size of load, whether there is only radial load, whether the axial load is one-way or two-way, the degree of vibration or impact, etc. After considering these factors, choose the appropriate SKF Bearing type.Precautions for the use of ina imported bearings
  • The analysis of the relative inclination between the inner ring and the outer ring causes the relative inclination between the inner ring and the outer ring of the bearing, and select the bearing type that can adapt to this service condition. If the relative inclination between the inner ring and the outer ring is too large, the bearing will be damaged due to internal load. Therefore, the type of bearing that can withstand this inclination should be selected.Precautions for the use of ina imported bearings
  • The speed can adapt to the SKF Bearing type of mechanical speed. The limit speed of the bearing is not only taken from the bearing type, but also limited to the bearing size, cage type, accuracy grade, load conditions and lubrication mode. Therefore, these factors must be considered in the selection. The following bearings are mostly used for high-speed rotation: deep groove ball bearings, angular contact ball bearings and cylindrical roller bearings.Precautions for the use of ina imported bearings

Check the lubricant of the ina imported bearings

  • Lubricants are important not only for bearings, but also for all SKF bearings. However, please note that Japanese bearings should not add too much grease. Then it’s time to change the lubricant of the bearing. After draining the old engine oil, if possible, the bearings lubricated with engine oil should be filled with fresh engine oil and let the machine rotate at low speed for a few minutes. Make the oil collect residual pollutants as much as possible, and then drain the oil. When replacing the grease of the bearing lubricated with grease, the Joe remover used shall avoid the contact of cotton with any part of the bearing. Because these residual fibers may wedge between rolling parts and cause damage, especially in bearing applications.
  • Through these three steps, you can well maintain your bearing, greatly increase its service life and save your operation cost.
  • Not only the surface quality of SKF Bearing workpiece is poor, but also the crystal corrosion resistance of the workpiece is reduced. When the SKF Bearing workpiece is seriously overheated, it will produce coarse grains and increase the amount of 8 iron cable in the steel, which is easy to deteriorate the hot working performance of the workpiece. When the stainless steel box or flange is overheated, it is easy to produce orange peel surface defects.
  • To this end, the following preventive measures are proposed:
  • Strictly control the forging heating temperature and heating and holding time of stainless steel box and flange parts to prevent the workpiece from overheating and coarse grain defects.
  • In the production of workpiece forging, if the forging ratio is too small and the final forging temperature is too high, it is also easy to have coarse-grained structure defects. The forging ratio of workpiece should be appropriate and sufficient and the final forging temperature should be moderate.
  • The solution treatment temperature of SKF Bearing workpiece should not be too high, the holding time should not be too long, the heating temperature should not be higher than 1150 “C, and the holding time should be calculated as 1-l_5min / mm.
  • For the coarse workpiece with overheated structure, the method of forging and refining grain can be used to eliminate the defects, prevent the orange peel surface defects of the workpiece during cold deformation, and improve the surface quality of the workpiece.

Measurement of primary dimension of imported bearings

  • Bearing thickness: fix the outside micrometer and change the measuring head from plane to spherical surface, which can be used to measure the bearing thickness. The thickness of the bearing should be controlled within the limit of 0.005 ~ 0.010 mm, otherwise the inner diameter of the bearing will be out of tolerance. The bearing has slight thinning near the opening, which should be paid attention to during measurement.Precautions for the use of ina imported bearings
  • Common tightness of bearing and bearing hole: the common tightness is guaranteed by the free spring opening and residual surface height of the bearing. Under the method of measuring the height of the remaining surface: assemble the bearing according to the rules, tighten the bolts of the bearing cover to the regular torque, loosen one of the bolts, and measure the clearance at the interface of the bearing cover with a feeler gauge, which shall be within the limit of 0.05 ~ 0.15mm.Precautions for the use of ina imported bearings
  • Bearing inner diameter: before measurement, install the bearing according to the rules and tighten the bolts of the bearing cover according to the regular torque. Measure with the inner diameter gauge after correcting the reference size on the outer diameter micrometer. Precautions for the use of ina imported bearings
  • Avoid the thinning area during measurement. The difference between the inner diameter of the bearing and the outer diameter of the corresponding journal is the common clearance.Precautions for the use of ina imported bearings
  • Coaxiality of the inner hole of the main bearing:

  • the coaxiality error of the inner hole of the main bearing is mainly formed by the coaxiality error of the bearing hole, and the cause of the coaxiality error of the bearing hole is the deformation of the cylinder block. When the radial circular runout of the main journal is within the regular public service, reflect on the eating and closing marks of the main journal and the bearing. Precautions for the use of ina imported bearings
  • If the eating and closing marks of each main IKO bearing are in a clear position and clarify that the coaxiality error is large, it can be handled by scraping, boring the bearing or changing the cylinder block, otherwise it is difficult to ensure the normal task of the generator.Precautions for the use of ina imported bearings
  • For the use of bearings, noise is very common. Even the low-noise bearings in Koyo imported bearings have the same situation. So why does it make noise? Today I will introduce its essence to you.
  • The raceway sound of Koyo imported bearing and its control method raceway sound is a smooth and continuous sound generated by the rolling body rolling on the raceway surface when Koyo imported bearing is running. It is a unique basic sound that will occur in all rolling bearings. Precautions for the use of ina imported bearings
  • The general bearing sound is the sound of raceway plus other sounds. The raceway sound of ball bearing is irregular, and its frequency is above 1000Hz. Its main frequency does not change with the speed, but its total sound pressure level increases with the speed. For the bearing with loud raceway sound, the sound pressure level of raceway sound decreases with the increase of viscosity;Precautions for the use of ina imported bearings
  •  For bearings with low raceway noise, the sound pressure level changes from decrease to increase when the viscosity increases to more than 20mm2 / s. The greater the rigidity of the bearing pedestal, the lower the total sound pressure level of the raceway sound. If the radial clearance is too small, the total sound pressure level and dominant frequency of raceway sound will increase sharply with the decrease of radial clearance. Precautions for the use of ina imported bearings
  • If the work is interrupted, the machine shall be covered with oil paper, plastic sheet or similar materials. If it is possible to clean the naked bearing without disassembly, clean it with a brush coated with petroleum solvent, and then wipe it dry with a piece of lint free cloth or blow it dry with compressed air (be careful not to start the rotation of the bearing assembly). Use a small mirror and a probe similar to that used by dentists to check the track surface, retainer and beads of the bearing. Do not clean the sealed cover or dust-proof bearing; Just wipe the outer surface. If the bearing is damaged, it needs to be replaced. It is much more economical to replace the bearing during the regular shutdown and maintenance period than the loss of sudden shutdown due to the damage of the array bearing.