The specific judgment method of whether fag bearing should be reported for repair, that is, the specific judgment method of fag bearing has been fully utilized and near damage is as follows:
It is a convenient and reliable method to judge the working state of fag bearing and decide when fag bearing should be repaired by using such instruments as Ferrograph or SPM or i-id-1 fag bearing working state monitoring instrument
For example, when HD-1 instrument is used, when the pointer approaches the dangerous area from the warning area, and the pointer does not return after taking measures to improve lubrication, it can be determined that it is the problem of fag bearing itself. At this time, the fag bearing can be reported for repair before entering the dangerous area. How far away from the dangerous area to start the repair can be adjusted by experience.
Using such an instrument, we can make full use of the working potential of fag bearings, report fag bearings for repair in time, and avoid faults. It is and economical.
In the absence of the above instruments, the operator can hold a round bar or wrench and other tools to collide with the part of the machine shell close to the nachifag bearing, shame his ears on the tool, and listen for the sound of fag axis transmitted by the tool. Of course, it is also possible to refit the medical stethoscope.
The normal fag shaft running sound should be uniform, stable and not harsh, while the abnormal fag shaft running sound has various intermittent, impact or harsh sounds First, get used to the normal fag shaft carrying sound, and then you can grasp and judge the abnormal fag shaft carrying sound.
Then, through the accumulation of practical experience, you can further analyze what kind of abnormal sound corresponds to what kind of abnormal phenomenon of fag bearing. There are many types of abnormal sounds of fag bearings, which are difficult to speak and mainly rely on experience accumulation.
Monitor with simple tools Analysis of ina bearing
The specific judgment method of whether fag bearing should be reported for repair, that is, the specific judgment method of fag bearing has been fully utilized and near damage is as follows:
Using fag bearing working state monitoring instrument
It is a convenient and reliable method to judge the working state of fag bearing and decide when fag bearing should be repaired by using such instruments as Ferrograph or SPM or i-id-1 fag bearing working state monitoring instrument
For example, when HD-1 instrument is used, when the pointer approaches the dangerous area from the warning area, and the pointer does not return after taking measures to improve lubrication, it can be determined that it is the problem of fag bearing itself. At this time, the fag bearing can be reported for repair before entering the dangerous area. How far away from the dangerous area to start the repair can be adjusted by experience.Analysis of ina bearing
Using such an instrument, we can make full use of the working potential of fag bearings, report fag bearings for repair in time, and avoid faults. It is and economical.Analysis of ina bearing
Monitor with simple tools Select the appropriate NTN bearing
In the absence of the above instruments, the operator can hold a round bar or wrench and other tools to collide with the part of the machine shell close to the nachifag bearing, shame his ears on the tool, and listen for the sound of fag axis transmitted by the tool. Of course, it is also possible to refit the medical stethoscope.Analysis of ina bearing
The normal fag shaft running sound should be uniform, stable and not harsh, while the abnormal fag shaft running sound has various intermittent, impact or harsh sounds First, get used to the normal fag shaft carrying sound, and then you can grasp and judge the abnormal fag shaft carrying sound. Analysis of ina bearing
Then, through the accumulation of practical experience, you can further analyze what kind of abnormal sound corresponds to what kind of abnormal phenomenon of fag bearing. There are many types of abnormal sounds of fag bearings, which are difficult to speak and mainly rely on experience accumulation. What is the friction torque of NTN bearing? If the inlet NTN bearing is selected according to its friction torque?Analysis of ina bearing
The friction of NTN bearing is mainly composed of dynamic friction and sliding friction between the moving elastic body and the ring raceway; The sliding friction between the cage and the moving body and the ferrule surface (the sliding friction between the moving bodies without the cage);Select the appropriate NTN bearing through the friction moment
The sliding friction between the end face of the roller and the retaining surface of the ferrule; Viscous resistance of lubricant; The sliding friction of the sealing device depends on the type, size, load, speed, lubrication, sealing and other factors of NTN bearing.Analysis of ina bearing
In instruments and machines that need low friction torque, deep groove ball NTN bearings, cylindrical roller NTN bearings and self-aligning ball NTN bearings are usually selected to bear radial load; Single row thrust ball NTN bearing is selected to bear NTN bearing load. Analysis of ina bearing
If it bears combined load, angular contact ball NTN bearing can be selected. When the load angle is basically consistent with the contact angle, small friction torque can be obtained; If the gap between the two angles is too large, it can be solved by assembling centripetal and thrust NTN bearings.Analysis of ina bearing
When selecting NTN bearing with low friction torque, contact sealing device should be avoided in structural design. At the same time, for NTN bearings with low friction torque, drip lubrication, oil mist lubrication and oil-gas lubrication should be adopted. Using reasonable cooling methods: the influence of cooling process on deformation after metal quenching is also a very important deformation reason. Analysis of ina bearing
The deformation of hot oil quenching is smaller than that of cold oil quenching, which is generally controlled at 100 ± 20 ℃. The cooling capacity of oil is also crucial to deformation. The stirring mode and speed of quenching affect the deformation. The faster the cooling speed of metal heat treatment, the more uneven the cooling, the greater the stress and the greater the deformation of the die.Analysis of ina bearing
Pre cooling can be adopted as far as possible on the premise of ensuring the hardness requirements of the die; The use of staged cooling and quenching can significantly reduce the thermal stress and structural stress during metal quenching, which is an effective method to reduce the deformation of some workpieces with complex shapes; For some workpieces with special complexity or high precision requirements, isothermal quenching can significantly reduce deformation.Analysis of ina bearing
Use appropriate medium: on the premise of ensuring the same hardness requirements, try to use oily medium. Experiments and practice have proved that on the premise of no difference in other conditions, the cooling speed of oily medium is slower, while that of aqueous medium is relatively faster. Analysis of ina bearing
Moreover, compared with oily medium, the change of water temperature has a greater impact on the cooling characteristics of aqueous medium. Under the same heat treatment conditions, the deformation of oily medium after quenching is relatively small compared with that of aqueous medium.Analysis of ina bearing
The structure of parts should be reasonable: during the cooling process after metal heat treatment, the thin part always cools fast and the thick part cools slowly. Under the condition of meeting the actual production needs, the great difference between the thickness of the workpiece should be reduced as far as possible, and the section of the part should be uniform as much as possible, so as to reduce the distortion and cracking tendency in the transition zone due to stress concentration; Analysis of ina bearing Select the appropriate NTN bearing through the friction moment
The symmetry of structure, material composition and structure of the workpiece shall be maintained as far as possible to reduce the distortion caused by uneven cooling; Sharp edges, corners, grooves, etc. shall be avoided as far as possible, and fillet transition shall be provided at the thickness junction and steps of the workpiece;Analysis of ina bearing
Try to reduce the asymmetry of hole and slot reinforcement structure on the workpiece; The method of reserving processing quantity is adopted for parts with uneven thickness.Analysis of ina bearing
Analysis of ina bearing sealing device
The thickener is composed of a network of soap fibers and functions like a container of lubricating oil. The space of reticular tissue is filled with lubricating oil, just as the small hole in the sea is filled with water.Analysis of ina bearing
If a sponge is squeezed, the water will flow out, and the oil will be discharged like a sponge. However, the oil in Timken bearing is rarely squeezed and discharged directly, because when a newly lubricated Timken bearing is running in, the oil moves in the internal space of Timken bearing.Analysis of ina bearing
The main reason why the grease is drained to the sliding surface is not all caused by mechanical operation, but due to the temperature rise of grease around Timken bearing. Enough oil must reach the sliding surface, and the selected grease and properties must be suitable for the type and operating conditions of Timken bearing.Analysis of ina bearing sealing device
If the mechanical stability of Timken bearing used under vibration is insufficient, the grease used will be continuously vibrated into or thrown out of Timken bearing, which will cause the structural collapse of metal soap and destroy the grease.Analysis of ina bearing
From the point of view of long life, the selection requirements of INA Bearing are:Analysis of ina bearing
NTN bearing model with high load capacity
In addition, if ina or ina is used for bearing selection, the service life of ina or ina bearing should be extended.
Ina bearings with high load capacity are adopted, such as cylindrical roller ina bearings with convexity, spherical roller ina bearings with symmetrical rollers, reinforced tapered roller ina bearings and ball ina bearings, ball ina bearings with corrected ball groove bus, or 70000cd series ina bearings are used to replace deep groove (single row centripetal) ball ina bearings. These ina bearings with high load capacity or due to the improvement of stress distribution, Or it may have higher fatigue life due to the large number of rolling elements.Analysis of ina bearing
Analysis of ina bearing sealing device
In order to select the proper size of INA Bearing, the working load, speed and operating temperature of INA Bearing must be accurately calculated or verified.Analysis of ina bearing
Load has a great impact on the service life of INA Bearing, so although it is difficult to measure the load, it should be measured as accurately as possible. When it is difficult to measure the load, the actual power consumed by the motor can be measured, and the power loss along the way can be calculated according to the transmission route and deducted until the ina bearing load is closer to the actual one. Analysis of ina bearing sealing device
If the calculated or measured load is too large, the expected fatigue life of INA Bearing must be reduced by a greater margin, which must be remedied. If the installation position allows, INA Bearing with a larger size can be selected; If the radial dimension is limited, the wider ina bearing should be selected when there is a wider ina bearing; If wider ina bearings cannot be used, ina bearings with higher load carrying capacity can be used instead.
Select appropriate ina bearing material
The price of ina bearing material should also be taken into account. When vacuum smelting or electroslag remelting steel has to be used, it should be noted that the lubrication conditions must be improved in order to double the expected fatigue life of INA Bearing.
Of course, the cost of selecting ina bearings made of this kind of high-quality steel is much more expensive than that of selecting ina bearings with high load capacity. However, for ina bearings that are difficult to access in machines and are extremely difficult to install and disassemble, or ina bearings used in mining and tunnel operation machinery, they must be considered sometimes in situations where maintenance is extremely difficult.
The surface cracks Analysis of ina bearing should be carefully
When using Koyo bearings, we should first check the appearance of imported bearings to judge whether they meet the standards we require. Let’s share with you what parts we should check.
Various mechanical scars, such as abrasion, scratch, crush and bruise, will cause poor installation of Koyo bearing, cause eccentric load and stress concentration, and reduce rotation accuracy and service life.
Rust, black skin and pitting. The latter two are defects that are easy to store moisture and dirt, which are easy to develop into rust. Corrosion is the pollution source leading to poor installation, early wear and fatigue. Serious corrosion will scrap Koyo bearings.
All kinds of cracks, such as raw material cracks, forging cracks, heat treatment cracks and grinding cracks, will become the source of stress concentration and expand rapidly in the future operation of Koyo bearing, resulting in the rupture of Koyo bearing, which has a great impact on the service life and workability of Koyo bearing. In fact, for Koyo bearings with important applications, Koyo bearing factory has conducted 100% magnetic or radiographic inspection on its components.
Peeling and folding, the local combination of these two defects with the base metal is not firm, and decarburization or carbon deficiency often exist around them in varying degrees. The material is easy to collapse, dent or wear, which is very unfavorable to the service life and accuracy of Koyo bearing.
For the riveting or welding quality of the cage, mainly observe whether the rivet head is offset, skewed, loose, lack of meat or “double eyelid”, whether the welding position is correct, whether the welding spot is too large or too small, and whether the rolling element is stuck due to loose welding or excessive welding.
The above items are the key inspection parts in the inspection of Koyo bearings. In addition to the above inspection parts, if the typing quality is poor, such as illegible and damaged, they should be considered defective, and the serious ones can also be rejected.
Improper disassembly of the shale shaker fag bearing may cause internal damage to the fag bearing. Contaminants may enter fag bearings or errors may occur during reinstallation. Therefore, the fag bearing of shale shaker must be disassembled with great care, and the axis must be properly supported, otherwise the disassembly force may damage the fag bearing.
Peripheral removal
Remove the outer ring of the interference fit. Set several outer ring extrusion screws on the circumference of the shell in advance, tighten the screws equally while removing. These screw holes are usually covered with blind plugs, separable fag bearings such as vibrating screen tapered roller fag bearings, set several cuts on the shoulder of the shell, use cushion blocks, disassemble with a press, or knock gently.
Disassembly of fag bearing with cylindrical hole of vibrating screen
The inner ring can be easily removed by pressure machinery. At this time, pay attention to make the inner ring bear its pulling force.
The inner ring of fag bearing of large vibrating screen is disassembled by oil pressure method. Oil pressure is applied through the oil hole arranged on the shaft to make it easy to pull out. The fag bearing with large width is disassembled by the combination of oil pressure method and drawing fixture.
Induction heating method can be used to disassemble the inner ring of fag bearing of Nu and NJ cylindrical roller vibrating screen. Disassembly of fag bearing in short taper hole
Disassemble the relatively small fag bearing with fixed sleeve, support the inner ring with the stop block fastened on the shaft, turn the nut back several times, and then knock it down with a cushion block and a hammer.
The position of SKF Bearing in industrial production needless to say, it is a heavy weight. Therefore, the development of today’s scientific and technological society is inseparable from the development of SKF Bearing Technology. Entering the bearing market, SKF bearings, domestic bearings, assembled SKF bearings and “Shanzhai SKF bearings” are flying all over the world.
Why do you choose SKF bearings instead of domestic bearings? Why did you choose SKF Bearing instead of other SKF bearings? Of course, there are many reasons, but in the end, we have to use SKF bearings that meet our own production requirements and excellent quality. Let’s take SKF Bearing as an example to talk about why the quality of SKF Bearing is so excellent;
Forging of imported SKF Bearing: the imported bearing uses the forging machine to exert pressure on the metal blank to make the SKF Bearing produce plastic deformation, so as to obtain the processing method of forging with certain mechanical properties, certain shape and size. SKF Bearing casting in Japan: the process of melting the metal into a liquid that meets certain requirements and pouring it into the mold.
After cooling, solidification and cleaning, the castings (parts or blanks) with predetermined shape, size and performance are obtained. High speed precision angular contact ball bearing in SKF Bearing. This kind of SKF Bearing is mainly used in high-speed rotation occasions with light load, and the requirements for SKF Bearing are also quite high. In the process of use, SKF Bearing is required to have high precision, high speed, low temperature rise, low vibration and certain service life.
Such SKF bearings are usually used as the supporting parts of high-speed motorized spindle. They are the key accessories of high-speed motorized spindle of internal surface grinder.
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