SKF bearings exhibit strong regularity during their use and are very repeatable. Normal high-quality stainless steel bearings have relatively small vibration and noise at the beginning of use, but the spectrum is somewhat scattered and the amplitude is small, which may be due to some defects in the manufacturing process, such as surface burrs.
After a period of exercise, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency appears. There are very few spectrums above the power frequency, and the stainless steel bearing state is very stable and enters a stable working period.
After continuing to run, the vibration and noise of the SKF bearing begin to increase, and sometimes abnormal sound occurs, but the vibration increases to an initial failure.
First, the spectral analysis of the bearing found that the concentration of non-ferrous metal elements was abnormal, and many sub-micron wear particles of non-ferrous metal components appeared in the iron spectrum; the moisture content of the lubricating oil exceeded the standard and the acid value exceeded the standard, indicating that the tile surface of the SKF bearing was corroded.
Second, the bearing spectrum analysis found that the iron concentration was abnormal. There were many sub-micron wear particles in the iron spectrum. The moisture and acid value of the lubricating oil were abnormal, indicating that the bearing back was worn due to fretting.
Third, there are iron-based abrasive grains or black oxide particles in the iron spectrum of the stainless steel bearing, and there is a tempered color on the metal surface, indicating that the journal surface of the bearing is strained.
Fourth, the cutting abrasive grains were found in the iron spectrum of the SKF bearing, and the abrasive grain composition was non-ferrous metal, indicating that the surface of the bearing was strained.
Fifth, the bearing spectral analysis found that the concentration of iron was abnormal. There were many submicron particles of iron in the iron spectrum. The moisture content of the lubricating oil exceeded or the acid value exceeded the standard, indicating that the journal surface of the needle bearing was corroded.
Now that we know the cause of the SKF bearing failure, then we mainly pay attention to these aspects, and the service life of the stainless steel bearing will naturally be long.
When the external hard particles enter the bearing and press between the body and the raceway, the surface can be indented. In addition, an excessive impact load can also cause local plastic deformation of the contact surface to form pits. When the SKF bearing is stationary, even if the load is small, evenly distributed pits will be formed on the raceway due to vibration of the surrounding environment.
When the SKF bearing seal is not good, dust or particulate matter enters the bearing, or the lubrication is poor, which will cause serious scratch or wear on the contact surface and increase the vibration and noise of the stainless steel bearing.
2018年12月18日星期二
Talking about: bearing characteristics of rolling mill
The roller and the raceway are in contact with the wire or repaired, and have a large radial load capacity, and are suitable for bearing heavy loads and impact loads. The friction coefficient is small, suitable for high speed, and the limit speed is close to the deep groove ball bearing.
It can move axially and can adapt to the change of the relative position of the shaft and the shell caused by thermal expansion or installation error. It can be used as a free end support.
The machining requirements of the shaft or the seat hole are relatively high, and the relative deflection of the outer ring axis after the bearing is installed must be strictly controlled to avoid contact stress concentration.
The inner or outer ring can be separated for easy installation and removal.
For steel stamping cages, for high-speed bearings or for bearings that require smooth operation, solid cages are used. Depending on the application and the user's requirements, cages with fiberglass reinforced plastics can also be designed and supplied.
It can move axially and can adapt to the change of the relative position of the shaft and the shell caused by thermal expansion or installation error. It can be used as a free end support.
The machining requirements of the shaft or the seat hole are relatively high, and the relative deflection of the outer ring axis after the bearing is installed must be strictly controlled to avoid contact stress concentration.
The inner or outer ring can be separated for easy installation and removal.
For steel stamping cages, for high-speed bearings or for bearings that require smooth operation, solid cages are used. Depending on the application and the user's requirements, cages with fiberglass reinforced plastics can also be designed and supplied.
2018年12月14日星期五
What is the role of bearing sleeves in machinery?
Fixed
When the gear shaft is moving, try not to let it shift direction due to vibration. At this time, you need to use a copper bearing bushing to help it fix.
The most important role of the copper bushing in the machine is the fixed position, which is all the performance of the copper bushing.
Plain bearing
This is another role played by the copper bushing in the machine. In order to reduce expenses and cost, it is necessary to use sliding bearings at this time, and the copper bushings just have this function. It mainly designs the thickness of the sleeve according to the axial direction of the bearing. In fact, the copper sleeve is a kind of sliding bearing, which can be used when the mechanical rotation is relatively low and the clearance requirement is relatively high. A copper bushing replaces the rolling bearing for operation. The copper bushings are wear resistant and can be used for a long time, so in a large part this can help to save costs.
What are the main applications of copper bushings?
The copper sleeve on the shaft acts as a bearing. It belongs to the general category of sliding bearings. It is a bearing that works under sliding friction. The opposite shaft is rotating. Generally, it needs auxiliary lubrication system to work. Sliding bearings work smoothly, reliably and without noise. Under liquid lubrication conditions, the sliding surface is separated by the lubricating oil without direct contact, and the friction loss and surface wear can be greatly reduced. The oil film also has a certain vibration absorbing capability.
The functions are lubrication, heat dissipation, friction reduction, and extended life.
Copper sleeves are mainly used in machinery, printing and dyeing, paper, chemical, aerospace, coal, petroleum, automotive, engineering machinery, metallurgy and other industries.
When the gear shaft is moving, try not to let it shift direction due to vibration. At this time, you need to use a copper bearing bushing to help it fix.
The most important role of the copper bushing in the machine is the fixed position, which is all the performance of the copper bushing.
Plain bearing
This is another role played by the copper bushing in the machine. In order to reduce expenses and cost, it is necessary to use sliding bearings at this time, and the copper bushings just have this function. It mainly designs the thickness of the sleeve according to the axial direction of the bearing. In fact, the copper sleeve is a kind of sliding bearing, which can be used when the mechanical rotation is relatively low and the clearance requirement is relatively high. A copper bushing replaces the rolling bearing for operation. The copper bushings are wear resistant and can be used for a long time, so in a large part this can help to save costs.
What are the main applications of copper bushings?
The copper sleeve on the shaft acts as a bearing. It belongs to the general category of sliding bearings. It is a bearing that works under sliding friction. The opposite shaft is rotating. Generally, it needs auxiliary lubrication system to work. Sliding bearings work smoothly, reliably and without noise. Under liquid lubrication conditions, the sliding surface is separated by the lubricating oil without direct contact, and the friction loss and surface wear can be greatly reduced. The oil film also has a certain vibration absorbing capability.
The functions are lubrication, heat dissipation, friction reduction, and extended life.
Copper sleeves are mainly used in machinery, printing and dyeing, paper, chemical, aerospace, coal, petroleum, automotive, engineering machinery, metallurgy and other industries.
2018年12月12日星期三
Assembly process of NTN bearing inner ring
1. Bearing shoulder fixing
The inner ring of the NTN bearing is axially fixed by means of shoulder and interference. Suitable for supporting structures fixed at both ends. The structure is simple and the outer dimensions are small.
2. The circlip of the bearing is fixed
The inner ring of the bearing is axially fixed by the shoulder and the lock nut. Can withstand small bidirectional axial loads. The axial structure is small in size.
3. The bearing lock nut is fixed
The inner ring of the NTN bearing is axially fixed by the shoulder and the lock nut. And the retaining washer is anti-loose, safe and reliable, suitable for high speed and heavy load occasions.
4. The end face thrust washer of the bearing is fixed
The inner ring of the NTN bearing is axially fixed by the shoulder and the shaft end retaining ring. The shaft end retaining ring is screwed to the shaft end. The fixing screws should have a locking device.
Applicable to occasions where the shaft end is not suitable for cutting threads or space is limited.
5. The bearing sleeve is fixed
The axial fixation of the inner ring of the bearing is achieved by the radial dimension of the inner bore of the adapter sleeve being compressed and clamped onto the shaft.
6. The bearing's withdrawal sleeve is fixed
The withdrawal sleeve is clamped in the same way as the adapter sleeve. However, due to the special nut, the NTN bearing is easy to load and unload, and is suitable for fixing the double-row spherical bearing with large radial load and small axial load on the optical axis.
Bearing assembly process
The ground parts are inspected and stored in the assembly library. If the production organization is proper, the parts can also be directly sorted into the assembly room. The bearings are not stored in the warehouse, and the NTN bearings reduce the production cycle. The assembly warehouse manager must not only keep the bearing parts in good condition, but also grasp the dimensional tolerance of the ferrule rolling and the dimensional tolerance of the rolling element. Do the statistics, issue the part tolerance order, organize the supplementary parts, and assemble the parts.
For small batch suction production, especially in the case of large dispersion of rolling elements and raceways, the bearing is often produced by first grinding a ferrule and sorting the ferrule size tolerance, and then rolling element size. Deviation state, the range of the grinding dimension of the other ring of the bearing is determined to obtain a higher closing ratio. Under normal circumstances, the final grinding outer race is close to the final process of the outer ring grinding process, and the custom tolerance is better placed on the outer ring.
The inner ring of the NTN bearing is axially fixed by means of shoulder and interference. Suitable for supporting structures fixed at both ends. The structure is simple and the outer dimensions are small.
2. The circlip of the bearing is fixed
The inner ring of the bearing is axially fixed by the shoulder and the lock nut. Can withstand small bidirectional axial loads. The axial structure is small in size.
3. The bearing lock nut is fixed
The inner ring of the NTN bearing is axially fixed by the shoulder and the lock nut. And the retaining washer is anti-loose, safe and reliable, suitable for high speed and heavy load occasions.
4. The end face thrust washer of the bearing is fixed
The inner ring of the NTN bearing is axially fixed by the shoulder and the shaft end retaining ring. The shaft end retaining ring is screwed to the shaft end. The fixing screws should have a locking device.
Applicable to occasions where the shaft end is not suitable for cutting threads or space is limited.
5. The bearing sleeve is fixed
The axial fixation of the inner ring of the bearing is achieved by the radial dimension of the inner bore of the adapter sleeve being compressed and clamped onto the shaft.
6. The bearing's withdrawal sleeve is fixed
The withdrawal sleeve is clamped in the same way as the adapter sleeve. However, due to the special nut, the NTN bearing is easy to load and unload, and is suitable for fixing the double-row spherical bearing with large radial load and small axial load on the optical axis.
Bearing assembly process
The ground parts are inspected and stored in the assembly library. If the production organization is proper, the parts can also be directly sorted into the assembly room. The bearings are not stored in the warehouse, and the NTN bearings reduce the production cycle. The assembly warehouse manager must not only keep the bearing parts in good condition, but also grasp the dimensional tolerance of the ferrule rolling and the dimensional tolerance of the rolling element. Do the statistics, issue the part tolerance order, organize the supplementary parts, and assemble the parts.
For small batch suction production, especially in the case of large dispersion of rolling elements and raceways, the bearing is often produced by first grinding a ferrule and sorting the ferrule size tolerance, and then rolling element size. Deviation state, the range of the grinding dimension of the other ring of the bearing is determined to obtain a higher closing ratio. Under normal circumstances, the final grinding outer race is close to the final process of the outer ring grinding process, and the custom tolerance is better placed on the outer ring.
2018年12月8日星期六
Basic requirements for steel for rolling bearings
First, contact fatigue strength
Under the action of cyclic load, the bearing surface is prone to fatigue failure, that is, cracking and spalling, which is the main damage form of the bearing. Therefore, in order to improve the service life of the bearing, the bearing steel must have a high contact fatigue strength.
Second, wear resistance
When the bearing is in operation, not only rolling friction occurs between the ferrule, the rolling element and the cage, but also sliding friction occurs, so that the bearing parts are continuously worn. In order to reduce the wear of bearing parts, maintain the bearing accuracy and stability, and extend the service life, the bearing steel should have good wear resistance.
Third, the hardness
Hardness is one of the important qualities of bearing quality and has a direct impact on contact fatigue strength, wear resistance and elastic limit. The hardness of the bearing steel in the use state generally reaches HRC61~65, in order to obtain high contact fatigue strength and wear resistance of the bearing.
Fourth, anti-rust performance
In order to prevent corrosion and rust of bearing parts and finished products during processing, storage and use, bearing steels are required to have good rust prevention performance.
Fifth, processing performance
In the production process, the bearing parts have to go through many cold and hot processing steps. In order to meet the requirements of high volume, high efficiency and high quality, the bearing steel should have good processing performance. For example, cold, thermoforming properties, machinability, hardenability, and the like.
In addition to the above basic requirements, bearing steel should also meet the requirements of proper chemical composition, uniform internal organization, less non-metallic inclusions, internal surface defects meeting the standard and surface decarburization layer not exceeding the specified concentration. These items are all in the raw material standards. Clear regulations.
Commonly used materials for bearing parts are: high carbon chromium bearing steel, carburized steel (such as 20Cr2Ni4A, 15Mn, 20Cr2MnMoA), high temperature bearing steel (such as Cr4Mo4V, Cr14Mo4, Cr15Mo4V, W18Cr4V), stainless bearing steel (9Cr18, 9Cr18Mo, 1Cr18Ni9Ti) , vacuum degassing steel, anti-magnetic bearing steel, etc., the most commonly used is high carbon chromium bearing steel. The basic steel grades of high carbon chromium bearing steels are GCr6, GCr9, GCr9SiMn, GCr15, GCr15SiMn. It is the most widely used and most used steel in the bearing manufacturing industry in China. It has good wear resistance and contact fatigue performance. Ideal processing performance with a certain degree of flexibility and toughness.
Under the action of cyclic load, the bearing surface is prone to fatigue failure, that is, cracking and spalling, which is the main damage form of the bearing. Therefore, in order to improve the service life of the bearing, the bearing steel must have a high contact fatigue strength.
Second, wear resistance
When the bearing is in operation, not only rolling friction occurs between the ferrule, the rolling element and the cage, but also sliding friction occurs, so that the bearing parts are continuously worn. In order to reduce the wear of bearing parts, maintain the bearing accuracy and stability, and extend the service life, the bearing steel should have good wear resistance.
Third, the hardness
Hardness is one of the important qualities of bearing quality and has a direct impact on contact fatigue strength, wear resistance and elastic limit. The hardness of the bearing steel in the use state generally reaches HRC61~65, in order to obtain high contact fatigue strength and wear resistance of the bearing.
Fourth, anti-rust performance
In order to prevent corrosion and rust of bearing parts and finished products during processing, storage and use, bearing steels are required to have good rust prevention performance.
Fifth, processing performance
In the production process, the bearing parts have to go through many cold and hot processing steps. In order to meet the requirements of high volume, high efficiency and high quality, the bearing steel should have good processing performance. For example, cold, thermoforming properties, machinability, hardenability, and the like.
In addition to the above basic requirements, bearing steel should also meet the requirements of proper chemical composition, uniform internal organization, less non-metallic inclusions, internal surface defects meeting the standard and surface decarburization layer not exceeding the specified concentration. These items are all in the raw material standards. Clear regulations.
Commonly used materials for bearing parts are: high carbon chromium bearing steel, carburized steel (such as 20Cr2Ni4A, 15Mn, 20Cr2MnMoA), high temperature bearing steel (such as Cr4Mo4V, Cr14Mo4, Cr15Mo4V, W18Cr4V), stainless bearing steel (9Cr18, 9Cr18Mo, 1Cr18Ni9Ti) , vacuum degassing steel, anti-magnetic bearing steel, etc., the most commonly used is high carbon chromium bearing steel. The basic steel grades of high carbon chromium bearing steels are GCr6, GCr9, GCr9SiMn, GCr15, GCr15SiMn. It is the most widely used and most used steel in the bearing manufacturing industry in China. It has good wear resistance and contact fatigue performance. Ideal processing performance with a certain degree of flexibility and toughness.
Introduction of outer spherical bearing series
The outer spherical ball bearing is actually a variant of the deep groove ball bearing, which is characterized in that the outer diameter outer surface of the outer ring ball is spherical, and can be fitted into the corresponding concave spherical surface of the bearing seat to serve as a centering function.
Although its basic performance should be similar to that of deep groove ball bearings, most of these bearings are used in relatively rough machines, the mounting position is not accurate enough, the axis of the shaft and the seat hole is poorly centered, or the shaft length is deflected. In the case of a large class, and the accuracy of the bearing itself is not high enough, and some structures are also rough, so the actual performance of the common performance is relatively discounted compared to the deep groove ball bearing of the same specification. For example, the outer spherical ball bearing with top wire is applied to the through shaft with large difference in deflection. The bearing has sealing ring on both sides to prevent the intrusion of dirt. The factory is filled with a proper amount of lubricant, and it does not need to be cleaned before installation. No need to add lubricant, the top wire screw on the protruding end of the inner ring of the bearing is fastened on the shaft. The permissible axial load must not exceed 20% of the rated dynamic load.
The outer spherical ball bearing with the eccentric sleeve has the same performance as the outer spherical bearing with the top wire, except that the top wire is not on the inner ring but on the eccentric sleeve. The inner hole of the tapered spherical outer spherical ball bearing is a tapered hole with a 1:12 taper. It can be mounted directly on the tapered shaft or mounted on the shaft without the shoulder by means of a tight bushing, and the bearing clearance can be fine-tuned.
Although its basic performance should be similar to that of deep groove ball bearings, most of these bearings are used in relatively rough machines, the mounting position is not accurate enough, the axis of the shaft and the seat hole is poorly centered, or the shaft length is deflected. In the case of a large class, and the accuracy of the bearing itself is not high enough, and some structures are also rough, so the actual performance of the common performance is relatively discounted compared to the deep groove ball bearing of the same specification. For example, the outer spherical ball bearing with top wire is applied to the through shaft with large difference in deflection. The bearing has sealing ring on both sides to prevent the intrusion of dirt. The factory is filled with a proper amount of lubricant, and it does not need to be cleaned before installation. No need to add lubricant, the top wire screw on the protruding end of the inner ring of the bearing is fastened on the shaft. The permissible axial load must not exceed 20% of the rated dynamic load.
The outer spherical ball bearing with the eccentric sleeve has the same performance as the outer spherical bearing with the top wire, except that the top wire is not on the inner ring but on the eccentric sleeve. The inner hole of the tapered spherical outer spherical ball bearing is a tapered hole with a 1:12 taper. It can be mounted directly on the tapered shaft or mounted on the shaft without the shoulder by means of a tight bushing, and the bearing clearance can be fine-tuned.
2018年12月7日星期五
Why is the bearing damaged?
Bearings are precision parts and only some of the bearings are damaged in practical applications.
Most of the bearings are damaged for many reasons - beyond the original estimated load, non-effective seals, too tight bearing clearance caused by too small bearing clearance. Any of these factors have their particular type of damage and leave a special mark of damage. Therefore, inspecting the bearing of the damaged shaft, in many cases, the possible causes can be found. In general, one-third of the bearing damage is caused by fatigue damage, and the other third is caused by poor lubrication. The other third is due to contaminants entering the bearing or improperly installed.
However, these types of damage are also related to industry. For example, most of the pulp and paper industry is due to poor lubrication or contamination resulting in bearing damage rather than material fatigue. Bearings are precision parts and therefore require a very careful attitude when used. Even if high-performance bearings are used, if they are used improperly, the expected performance effects will not be achieved and the bearings will be damaged easily. Therefore, the following matters should be noted when using bearings:
1. Keep the bearings and their surroundings clean. Even if tiny dust that is invisible to the naked eye enters the bearings, it will increase the wear, vibration and noise of the bearings.
Second, use the installation carefully and carefully Do not allow strong stamping, do not allow the hammer to directly hit the bearing, does not allow the pressure to pass through the rolling element.
Third, the use of appropriate and accurate installation tools Try to use special tools, try to avoid the use of cloth and short fibers and the like. Fourth, to prevent the corrosion of the bearing When taking the bearing directly by hand, it is necessary to fully wash the sweat on the hand, and apply high-quality mineral oil before operation, especially in the rainy season and summer to pay attention to rust.
However, under certain special operating conditions, bearings can achieve longer life than traditional calculations, especially at light loads. These special operating conditions are when the rolling surfaces (tracks and rolling elements) are effectively separated by a lubricating film and the surface damage caused by contaminants is limited. In fact, under ideal conditions, so-called permanent bearing life is possible. Bearing life
The life of a rolling bearing is defined by the number of revolutions (or hours of operation at a certain speed): Bearings within this life are subject to initial fatigue damage (flaking or missing) on any of their bearing rings or rolling elements. However, whether in laboratory tests or in actual use, it can be clearly seen that under the same working conditions, the appearance of the same bearing, the actual life is very different. In addition, there are several different definitions of the bearing "life", one of which is the so-called "working life", which means that the actual life that a bearing can reach before it is damaged is caused by wear and damage, usually not caused by fatigue, but Caused by wear, corrosion, seal damage, etc.
Most of the bearings are damaged for many reasons - beyond the original estimated load, non-effective seals, too tight bearing clearance caused by too small bearing clearance. Any of these factors have their particular type of damage and leave a special mark of damage. Therefore, inspecting the bearing of the damaged shaft, in many cases, the possible causes can be found. In general, one-third of the bearing damage is caused by fatigue damage, and the other third is caused by poor lubrication. The other third is due to contaminants entering the bearing or improperly installed.
However, these types of damage are also related to industry. For example, most of the pulp and paper industry is due to poor lubrication or contamination resulting in bearing damage rather than material fatigue. Bearings are precision parts and therefore require a very careful attitude when used. Even if high-performance bearings are used, if they are used improperly, the expected performance effects will not be achieved and the bearings will be damaged easily. Therefore, the following matters should be noted when using bearings:
1. Keep the bearings and their surroundings clean. Even if tiny dust that is invisible to the naked eye enters the bearings, it will increase the wear, vibration and noise of the bearings.
Second, use the installation carefully and carefully Do not allow strong stamping, do not allow the hammer to directly hit the bearing, does not allow the pressure to pass through the rolling element.
Third, the use of appropriate and accurate installation tools Try to use special tools, try to avoid the use of cloth and short fibers and the like. Fourth, to prevent the corrosion of the bearing When taking the bearing directly by hand, it is necessary to fully wash the sweat on the hand, and apply high-quality mineral oil before operation, especially in the rainy season and summer to pay attention to rust.
However, under certain special operating conditions, bearings can achieve longer life than traditional calculations, especially at light loads. These special operating conditions are when the rolling surfaces (tracks and rolling elements) are effectively separated by a lubricating film and the surface damage caused by contaminants is limited. In fact, under ideal conditions, so-called permanent bearing life is possible. Bearing life
The life of a rolling bearing is defined by the number of revolutions (or hours of operation at a certain speed): Bearings within this life are subject to initial fatigue damage (flaking or missing) on any of their bearing rings or rolling elements. However, whether in laboratory tests or in actual use, it can be clearly seen that under the same working conditions, the appearance of the same bearing, the actual life is very different. In addition, there are several different definitions of the bearing "life", one of which is the so-called "working life", which means that the actual life that a bearing can reach before it is damaged is caused by wear and damage, usually not caused by fatigue, but Caused by wear, corrosion, seal damage, etc.
2018年12月5日星期三
Structure of the slewing bearing
The slewing bearing is a medium-sized and large-sized bearing that can withstand a large load of a large axial load, radial load and overturning moment.
Under normal circumstances, the slewing bearing itself has mounting holes, lubricating oil holes and sealing devices to meet the different needs of various types of mainframes working under various working conditions; on the other hand, the {TodayHot} slewing bearing itself has a compact structure. It is widely used in lifting and transporting machinery, metallurgical machinery, mining machinery, construction machinery, port machinery and automated assembly lines, etc.
According to different structural forms, RS slewing bearings can be divided into four types of contact ball slewing bearings, double row ball slewing bearings, cross cylindrical roller slewing bearings and three rows of cylindrical roller combination slewing bearings, etc. Bearings are divided into different structures such as toothless, external gear and internal gear according to whether they are toothed or toothed.
According to different structural characteristics, the slewing bearing can meet the requirements of the working host under various load conditions {HotTag}. Among them, the four-point contact ball slewing bearing has high dynamic load capacity, the cross cylindrical roller slewing bearing has high static load capacity, and the three-row cylindrical roller combined slewing bearing leads the bearing capacity to the height direction of the bearing. The various loads are respectively subjected to different raceways and roller sets, so that the bearing diameter can be greatly reduced under the same stress conditions, so that the main machine is more compact, and it is a high load capacity turntable. Bearing.
Code designation of slewing bearing
First, the composition of the code
The bearing code consists of a basic code and a post code.
Second, the composition of the basic code
The basic code is divided into three parts, the front part is the structure type and the transmission type code, the middle part is the rolling element diameter (the bearing is the largest rolling element diameter for the two rows of rolling elements), and the rear part is the rolling element center circle diameter (for the two rows) The bearing of the above rolling element is the diameter of the center of the largest rolling element)
1. The structure type code is as specified in Table 1.
01 Four point contact ball bearing 02 Double row reducer ball bearing 11 Cross cylindrical roller bearing 13 Three row cylindrical roller combination bearing
2. The transmission type code is as specified in Table 2.
0 toothless type 1 involute cylindrical gear outer teeth smaller modulus 2 involute cylindrical gear outer teeth larger modulus 3 involute cylindrical gear internal teeth smaller modulus 4 involute cylindrical gear internal teeth larger When the basic code number of the modulo 3 basic code preparation rules is arranged, the structure type code and the drive type code are consecutively written, and the front, middle and rear parts are separated by ".".
Under normal circumstances, the slewing bearing itself has mounting holes, lubricating oil holes and sealing devices to meet the different needs of various types of mainframes working under various working conditions; on the other hand, the {TodayHot} slewing bearing itself has a compact structure. It is widely used in lifting and transporting machinery, metallurgical machinery, mining machinery, construction machinery, port machinery and automated assembly lines, etc.
According to different structural forms, RS slewing bearings can be divided into four types of contact ball slewing bearings, double row ball slewing bearings, cross cylindrical roller slewing bearings and three rows of cylindrical roller combination slewing bearings, etc. Bearings are divided into different structures such as toothless, external gear and internal gear according to whether they are toothed or toothed.
According to different structural characteristics, the slewing bearing can meet the requirements of the working host under various load conditions {HotTag}. Among them, the four-point contact ball slewing bearing has high dynamic load capacity, the cross cylindrical roller slewing bearing has high static load capacity, and the three-row cylindrical roller combined slewing bearing leads the bearing capacity to the height direction of the bearing. The various loads are respectively subjected to different raceways and roller sets, so that the bearing diameter can be greatly reduced under the same stress conditions, so that the main machine is more compact, and it is a high load capacity turntable. Bearing.
Code designation of slewing bearing
First, the composition of the code
The bearing code consists of a basic code and a post code.
Second, the composition of the basic code
The basic code is divided into three parts, the front part is the structure type and the transmission type code, the middle part is the rolling element diameter (the bearing is the largest rolling element diameter for the two rows of rolling elements), and the rear part is the rolling element center circle diameter (for the two rows) The bearing of the above rolling element is the diameter of the center of the largest rolling element)
1. The structure type code is as specified in Table 1.
01 Four point contact ball bearing 02 Double row reducer ball bearing 11 Cross cylindrical roller bearing 13 Three row cylindrical roller combination bearing
2. The transmission type code is as specified in Table 2.
0 toothless type 1 involute cylindrical gear outer teeth smaller modulus 2 involute cylindrical gear outer teeth larger modulus 3 involute cylindrical gear internal teeth smaller modulus 4 involute cylindrical gear internal teeth larger When the basic code number of the modulo 3 basic code preparation rules is arranged, the structure type code and the drive type code are consecutively written, and the front, middle and rear parts are separated by ".".
Tips for disassembling the outer spherical bearing
The outer spherical bearing is a self-aligning bearing with a spherical surface on the outer surface of the bearing outer ring and a sealing cover on both sides of the bearing. 390000 series outer spherical bearings are commonly used in agricultural machinery. These bearings are widely used in Xinjiang 1, 2, Futian, Zhongyuan and other combine harvesters, and more than 30 disks are used on one locomotive. The 390000 series outer spherical bearing is used to fix the inner ring of the bearing and the shaft through an eccentric sleeve, and the hexagon socket screw on the eccentric sleeve is used for fastening. In the maintenance, many operators will not disassemble such bearings, so it is necessary to introduce the technical points and precautions for disassembling the 390000 series spherical bearings:
First, disassembly
1. First loosen the locking screw on the eccentric sleeve of the bearing with an Allen key, then insert the small iron rod into the counterbore on the eccentric sleeve of the top cover and loosen the eccentric sleeve against the direction of rotation of the shaft.
2. Loosen the bolts that secure the housing. Remove the bearing from the shaft together with the housing. Note before the housing on one end of the shaft is removed. The bearing bolts at the other end of the shaft should be loosened to prevent the bearings at both ends from being damaged by each other.
Second, the installation
1. Before installing the bearing on the shaft, the bearing pin of the bearing sleeve must be unplugged, and the surface of the journal should be smoothed and cleaned, and the oil should be rust-proof and lubricated at the journal (allowing the bearing to rotate slightly on the shaft).
2. Apply lubricant to the bearing seat and bearing mating surface, and install the bearing into the bearing housing. Then the assembled bearing is placed on the shaft together with the bearing housing. Push to the desired location for installation.
3. The bolts of the fixed bearing housing should not be tightened first, so that the bearing housing can rotate in the bearing housing. Also install the other end bearing and seat on the same shaft, turn the shaft a few turns, and let the bearing itself automatically find the position. Then tighten the bearing block bolts.
4. Install the eccentric sleeve. First, eccentric sleeve is placed on the eccentric step of the inner sleeve of the bearing, and the shaft is tightened by hand in the direction of rotation. Then insert or hold the small iron rod against the counterbore on the eccentric sleeve. 1. Use the hammer to strike the small iron rod in the direction of rotation of the shaft. Install the eccentric sleeve securely and finally lock the socket head cap screws on the eccentric sleeve.
First, disassembly
1. First loosen the locking screw on the eccentric sleeve of the bearing with an Allen key, then insert the small iron rod into the counterbore on the eccentric sleeve of the top cover and loosen the eccentric sleeve against the direction of rotation of the shaft.
2. Loosen the bolts that secure the housing. Remove the bearing from the shaft together with the housing. Note before the housing on one end of the shaft is removed. The bearing bolts at the other end of the shaft should be loosened to prevent the bearings at both ends from being damaged by each other.
Second, the installation
1. Before installing the bearing on the shaft, the bearing pin of the bearing sleeve must be unplugged, and the surface of the journal should be smoothed and cleaned, and the oil should be rust-proof and lubricated at the journal (allowing the bearing to rotate slightly on the shaft).
2. Apply lubricant to the bearing seat and bearing mating surface, and install the bearing into the bearing housing. Then the assembled bearing is placed on the shaft together with the bearing housing. Push to the desired location for installation.
3. The bolts of the fixed bearing housing should not be tightened first, so that the bearing housing can rotate in the bearing housing. Also install the other end bearing and seat on the same shaft, turn the shaft a few turns, and let the bearing itself automatically find the position. Then tighten the bearing block bolts.
4. Install the eccentric sleeve. First, eccentric sleeve is placed on the eccentric step of the inner sleeve of the bearing, and the shaft is tightened by hand in the direction of rotation. Then insert or hold the small iron rod against the counterbore on the eccentric sleeve. 1. Use the hammer to strike the small iron rod in the direction of rotation of the shaft. Install the eccentric sleeve securely and finally lock the socket head cap screws on the eccentric sleeve.
2018年12月4日星期二
Use of bearings
2.1 Precautions for use Rolling bearings are precision parts. Therefore, it is required to be cautious when using them. Even if high-performance bearings are used, if they are not used properly, the expected performance effects will not be achieved. Therefore, the following matters should be noted when using bearings. :
2.1.1 Keep the bearings and their surroundings clean. Even if the smiling dust that is invisible to the naked eye enters the bearing, it will increase the wear, vibration and noise of the bearing.
2.1.2 Care should be taken when using the installation. Strong stamping is not allowed. It is not allowed to directly hit the bearing with a hammer. It is not allowed to transmit pressure through the rolling elements. 2.1.3 Use appropriate and accurate installation tools, try to use special tools, and try to avoid the use of cloth and short fibers.
2.1.4 Prevent the corrosion of the bearing. When taking the bearing directly by hand, wash the sweat on the hand and apply it with high-quality mineral oil before handling. In the rainy season and summer, pay special attention to rust prevention.
2.2 Cooperation
2.2.1 Selection of the fit The inner diameter and outer diameter of the rolling bearing are manufactured according to standard tolerances. The tightness of the inner ring of the bearing and the shaft and the outer ring and the seat hole can only be achieved by controlling the tolerance of the journal and the tolerance of the seat hole. achieve. The inner ring of the bearing and the shaft are made of a base hole, and the outer ring of the bearing and the seat hole are made by a shaft. The common fit of rolling bearings is shown in Figure 2-1. The correct choice of fit, you must know the actual load conditions of the bearing, operating temperature and other requirements, but in fact it is very difficult. Therefore, most of the cases are based on the use of lint selection.
2.2.2 Load properties Selection The first consideration should be to consider the rotation of the load vector relative to the ferrule. According to the rotation of the synthetic radial load vector relative to the ferrule, the load on the ferrule can be divided into: fixed load, rotary load and oscillating load, as shown in Figure 2-2.
a. The composite radial load acting on the ferrule is carried by the local area of the ferrule raceway and transmitted to the corresponding local area of the shaft or housing. This load is called a fixed load. It is characterized by a synthetic radial load vector and a relatively stationary ferrule. A ferrule that is subjected to a directional load can be loosely fitted.
b. The combined radial load acting on the ferrule by the rotating load rotates in the circumferential direction of the raceway, and is sequentially received by each part. This load is called the rotating load and is characterized by the synthetic radial load vector rotating relative to the ferrule. . The ferrule subjected to the rotating load should be tightly fitted. In special cases, such as the load is very light, or the ferrule only rotates at a low speed occasionally under heavy load. When the bearing is made of harder material and the surface roughness is higher, it is subjected to the rotating load. The ferrule can also be used with a loose fit.
c. The oscillating load acts on the ferrule on the direction of the synthetic radial load. This load condition is called oscillating load or non-directional load. It is characterized by the fact that the synthetic radial load vector on the ferrule is fixed in the ferrule raceway. The swing in the area is carried by a certain area of the raceway, or the load acting on the bearing is an impact load, a vibration load, a direction, and a load whose value frequently changes. The bearing in the bearing, the outer ring and the circumference, the bearing seat and the hole should be tightly matched by the oscillating load.
2.2.3 Load size The amount of over-win between the ferrule and the shaft or casing depends on the size of the load. The heavier load uses a larger over-win, and the lighter load uses a smaller over-win. The equivalent radial load p is usually divided into three cases of “light”, “normal” and “heavy” load, and its relationship with the rated dynamic load c of the bearing is listed in Table 2-1 for the selection of the shaft and the seat hole tolerance band. reference.
2.2.4 Shaft and Housing Hole Tolerance Band Selection Depending on the size and nature of the load, the tolerances for the shaft and control are specified in Table 2-2 - Table 2-4. 2.2.5 Surface roughness and shape tolerance The surface roughness and shape tolerance directly affect the product's performance, such as wear resistance, corrosion resistance and compounding properties. For this reason, it is necessary to reasonably specify the geometrical tolerances of the shaft and the casing hole and the roughness requirements of the mating surface. It is essential to improve the joint strength of the win-win fit for the stable mating property.
See Table 2-5 - Table 2-6 and Figure 2-3 for the mating surface roughness and shape tolerance of the shaft and housing holes
2.3 Bearing installation Whether the bearing installation is good or not will affect the accuracy, life and performance of the bearing. Therefore, please fully study the installation of the bearing, that is, install the bearing in accordance with the operating standards including the following items.
2.3.1 Cleaning the bearings and related parts. (For grease-lubricated bearings and double-sided oil seals or dust caps, seal bearings are not required to be cleaned before installation.) 2.3.2 Checking the dimensions and finishing of related parts
2.3.3 Installation method The installation of the bearing should be based on the bearing structure, size and the matching nature of the bearing components. The pressure should be directly applied to the end face of the tightly fitting ferrule. The pressure should not be transmitted through the rolling element. The bearing installation generally adopts the following method. :
a. The inner ring of the press-fit bearing is tightly fitted with the shaft. When the outer ring and the bearing housing hole are loosely fitted, the bearing can be press-fitted on the shaft by the press, and then the shaft is fitted into the bearing housing hole together with the bearing. As shown in Figure 2-4, the mounting sleeve (copper or mild steel) made of soft metal material is placed on the end surface of the inner ring of the bearing during press fitting. The inner diameter of the fitting sleeve should be slightly larger than the diameter of the journal, and the outer diameter should be slightly smaller than the inner ring of the bearing to avoid pressing on the cage. The bearing outer ring is tightly matched with the bearing housing hole. When the inner ring and the shaft are loosely fitted, the bearing can be first pressed into the bearing housing hole. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole, as shown in FIG. 2 5 is shown. If the bearing ring is tightly fitted with the shaft and the seat hole, the inner ring and the outer ring should be pressed into the shaft and the seat hole at the same time. The structure of the assembly sleeve should be able to simultaneously tighten the end faces of the inner ring and the outer ring of the bearing, such as Figure 2-6 shows.
b. Heating and fitting The heating method is used to convert the tight fit into a loose fit by heating the bearing or the bearing housing. It is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Before the hot assembly, put the bearing or the ferrule of the separable bearing into the fuel tank and heat it evenly at 80-100 °C, then remove it from the oil and load it on the shaft as soon as possible. After the cooling is prevented, the inner ring end face and the shoulder are not tightly attached, and the bearing can be axially tightened after cooling. When the outer ring of the bearing is tightly matched with the bearing seat made of light metal, the hot mounting method of the heated bearing seat can avoid the abrasion of the mating surface. When heating the bearing with the fuel tank, there should be a grid at a certain distance from the bottom of the box, as shown in Figure 2-7, or the bearing is hung with a hook. The bearing cannot be placed on the bottom of the box to prevent impurities from entering the bearing or uneven heating. There must be a thermometer in the fuel tank, and the oil temperature should not be strictly controlled to exceed 100 °C to prevent the tempering effect and reduce the hardness of the ferrule.
c. Installation of tapered bore bearing The tapered bore bearing can be mounted directly on the tapered journal or on the tapered surface of the adapter sleeve and the withdrawal sleeve. The tightness of the fit can be reduced by the radial clearance of the bearing. Measure, therefore, the radial clearance of the bearing should be measured before installation. The clearance should be measured frequently during the installation to achieve the required clearance reduction. The installation is usually done with a lock nut or a heating installation. .
d. Installation of thrust bearing The circumference of the thrust bearing and the shaft are generally matched. The fit between the race and the bearing bore is generally clearance fit. Therefore, the bearing is easier to install. The shaft spring of the double-way thrust bearing should be on the shaft. Fixed on top to prevent rotation relative to the shaft. The mounting method of the bearing is generally the case where the shaft rotates. Therefore, the cooperation between the inner ring and the shaft is a win-win cooperation, and the cooperation between the outer ring of the bearing and the bearing chamber is a clearance fit.
2.1.1 Keep the bearings and their surroundings clean. Even if the smiling dust that is invisible to the naked eye enters the bearing, it will increase the wear, vibration and noise of the bearing.
2.1.2 Care should be taken when using the installation. Strong stamping is not allowed. It is not allowed to directly hit the bearing with a hammer. It is not allowed to transmit pressure through the rolling elements. 2.1.3 Use appropriate and accurate installation tools, try to use special tools, and try to avoid the use of cloth and short fibers.
2.1.4 Prevent the corrosion of the bearing. When taking the bearing directly by hand, wash the sweat on the hand and apply it with high-quality mineral oil before handling. In the rainy season and summer, pay special attention to rust prevention.
2.2 Cooperation
2.2.1 Selection of the fit The inner diameter and outer diameter of the rolling bearing are manufactured according to standard tolerances. The tightness of the inner ring of the bearing and the shaft and the outer ring and the seat hole can only be achieved by controlling the tolerance of the journal and the tolerance of the seat hole. achieve. The inner ring of the bearing and the shaft are made of a base hole, and the outer ring of the bearing and the seat hole are made by a shaft. The common fit of rolling bearings is shown in Figure 2-1. The correct choice of fit, you must know the actual load conditions of the bearing, operating temperature and other requirements, but in fact it is very difficult. Therefore, most of the cases are based on the use of lint selection.
2.2.2 Load properties Selection The first consideration should be to consider the rotation of the load vector relative to the ferrule. According to the rotation of the synthetic radial load vector relative to the ferrule, the load on the ferrule can be divided into: fixed load, rotary load and oscillating load, as shown in Figure 2-2.
a. The composite radial load acting on the ferrule is carried by the local area of the ferrule raceway and transmitted to the corresponding local area of the shaft or housing. This load is called a fixed load. It is characterized by a synthetic radial load vector and a relatively stationary ferrule. A ferrule that is subjected to a directional load can be loosely fitted.
b. The combined radial load acting on the ferrule by the rotating load rotates in the circumferential direction of the raceway, and is sequentially received by each part. This load is called the rotating load and is characterized by the synthetic radial load vector rotating relative to the ferrule. . The ferrule subjected to the rotating load should be tightly fitted. In special cases, such as the load is very light, or the ferrule only rotates at a low speed occasionally under heavy load. When the bearing is made of harder material and the surface roughness is higher, it is subjected to the rotating load. The ferrule can also be used with a loose fit.
c. The oscillating load acts on the ferrule on the direction of the synthetic radial load. This load condition is called oscillating load or non-directional load. It is characterized by the fact that the synthetic radial load vector on the ferrule is fixed in the ferrule raceway. The swing in the area is carried by a certain area of the raceway, or the load acting on the bearing is an impact load, a vibration load, a direction, and a load whose value frequently changes. The bearing in the bearing, the outer ring and the circumference, the bearing seat and the hole should be tightly matched by the oscillating load.
2.2.3 Load size The amount of over-win between the ferrule and the shaft or casing depends on the size of the load. The heavier load uses a larger over-win, and the lighter load uses a smaller over-win. The equivalent radial load p is usually divided into three cases of “light”, “normal” and “heavy” load, and its relationship with the rated dynamic load c of the bearing is listed in Table 2-1 for the selection of the shaft and the seat hole tolerance band. reference.
2.2.4 Shaft and Housing Hole Tolerance Band Selection Depending on the size and nature of the load, the tolerances for the shaft and control are specified in Table 2-2 - Table 2-4. 2.2.5 Surface roughness and shape tolerance The surface roughness and shape tolerance directly affect the product's performance, such as wear resistance, corrosion resistance and compounding properties. For this reason, it is necessary to reasonably specify the geometrical tolerances of the shaft and the casing hole and the roughness requirements of the mating surface. It is essential to improve the joint strength of the win-win fit for the stable mating property.
See Table 2-5 - Table 2-6 and Figure 2-3 for the mating surface roughness and shape tolerance of the shaft and housing holes
2.3 Bearing installation Whether the bearing installation is good or not will affect the accuracy, life and performance of the bearing. Therefore, please fully study the installation of the bearing, that is, install the bearing in accordance with the operating standards including the following items.
2.3.1 Cleaning the bearings and related parts. (For grease-lubricated bearings and double-sided oil seals or dust caps, seal bearings are not required to be cleaned before installation.) 2.3.2 Checking the dimensions and finishing of related parts
2.3.3 Installation method The installation of the bearing should be based on the bearing structure, size and the matching nature of the bearing components. The pressure should be directly applied to the end face of the tightly fitting ferrule. The pressure should not be transmitted through the rolling element. The bearing installation generally adopts the following method. :
a. The inner ring of the press-fit bearing is tightly fitted with the shaft. When the outer ring and the bearing housing hole are loosely fitted, the bearing can be press-fitted on the shaft by the press, and then the shaft is fitted into the bearing housing hole together with the bearing. As shown in Figure 2-4, the mounting sleeve (copper or mild steel) made of soft metal material is placed on the end surface of the inner ring of the bearing during press fitting. The inner diameter of the fitting sleeve should be slightly larger than the diameter of the journal, and the outer diameter should be slightly smaller than the inner ring of the bearing to avoid pressing on the cage. The bearing outer ring is tightly matched with the bearing housing hole. When the inner ring and the shaft are loosely fitted, the bearing can be first pressed into the bearing housing hole. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole, as shown in FIG. 2 5 is shown. If the bearing ring is tightly fitted with the shaft and the seat hole, the inner ring and the outer ring should be pressed into the shaft and the seat hole at the same time. The structure of the assembly sleeve should be able to simultaneously tighten the end faces of the inner ring and the outer ring of the bearing, such as Figure 2-6 shows.
b. Heating and fitting The heating method is used to convert the tight fit into a loose fit by heating the bearing or the bearing housing. It is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Before the hot assembly, put the bearing or the ferrule of the separable bearing into the fuel tank and heat it evenly at 80-100 °C, then remove it from the oil and load it on the shaft as soon as possible. After the cooling is prevented, the inner ring end face and the shoulder are not tightly attached, and the bearing can be axially tightened after cooling. When the outer ring of the bearing is tightly matched with the bearing seat made of light metal, the hot mounting method of the heated bearing seat can avoid the abrasion of the mating surface. When heating the bearing with the fuel tank, there should be a grid at a certain distance from the bottom of the box, as shown in Figure 2-7, or the bearing is hung with a hook. The bearing cannot be placed on the bottom of the box to prevent impurities from entering the bearing or uneven heating. There must be a thermometer in the fuel tank, and the oil temperature should not be strictly controlled to exceed 100 °C to prevent the tempering effect and reduce the hardness of the ferrule.
c. Installation of tapered bore bearing The tapered bore bearing can be mounted directly on the tapered journal or on the tapered surface of the adapter sleeve and the withdrawal sleeve. The tightness of the fit can be reduced by the radial clearance of the bearing. Measure, therefore, the radial clearance of the bearing should be measured before installation. The clearance should be measured frequently during the installation to achieve the required clearance reduction. The installation is usually done with a lock nut or a heating installation. .
d. Installation of thrust bearing The circumference of the thrust bearing and the shaft are generally matched. The fit between the race and the bearing bore is generally clearance fit. Therefore, the bearing is easier to install. The shaft spring of the double-way thrust bearing should be on the shaft. Fixed on top to prevent rotation relative to the shaft. The mounting method of the bearing is generally the case where the shaft rotates. Therefore, the cooperation between the inner ring and the shaft is a win-win cooperation, and the cooperation between the outer ring of the bearing and the bearing chamber is a clearance fit.
2018年12月3日星期一
Difference between plain bearing and roller bearing
One: roller bearing:
1. The processing of steel balls, the processing of stainless steel balls also varies according to the state of the raw materials. The processes before the frustration or the photosphere can be divided into the following three types. The processes before the heat treatment can be further divided into the following steps. Two kinds of processing, the whole processing process is: stainless steel bar or wire cold punching (some bars need to be punched and annealed after cold pressing) frustration, rough grinding, soft grinding or photosphere heat treatment hard grinding fine grinding or grinding The final inspection group is rust-proof and packaged into the warehouse.
2. The processing of the ferrule: The processing of the inner and outer rings of the bearing varies according to the raw material or the form of the blank. The process before the machining can be divided into the following three types. The whole processing process is: bar or pipe material (Some bars need to be forged and annealed, normalized) Car processing heat treatment Cylindrical grinding processing or polishing parts final inspection anti-rust storage (to be combined with the package)
3. Processing of the cage The processing of the cage can be divided into the following two categories depending on the design structure and raw materials:
(1) Sheet → shear → punching → hot press stamping forming → shaping and fine machining → ultrasonic cleaning machine pickling or shot peening or stringing → final inspection → rust prevention, packaging → storage (to be combined )
(2) Processing of the solid cage: The processing of the solid cage varies according to the raw materials or the gross damage. The following four types of blanks can be divided into the following processing: The bar is Pipe, forgings, castings, inner diameter, outer diameter, end face, chamfering hole (or pull hole, boring), pickling, final inspection, rust prevention, packaging, storage, and assembly.
4. The processing of the roller during the processing of the roller varies according to the raw materials. The process before the heat treatment can be divided into the following two types. The whole processing process is as follows: bar processing or wire cold rolling, string ring and soft grinding Heat treatment string soft point rough grinding outer diameter rough grinding end face end grinding end face fine grinding outer diameter final grinding outer diameter final inspection group anti-rust, packaging into storage (to be combined with the package).
Two: plane bearing:
Planar bearings consist of a planar cage assembly with needle bearings or cylindrical rollers and a flat washer. Needle bearings and cylindrical rollers are held and guided by the planar cage. When used with different series of DF planar bearing washers, many different combinations are available for bearing configurations. The use of high-precision cylindrical rollers (needle rollers) increases the contact length, allowing the bearing to achieve high load capacity and high stiffness in a small space. Another advantage is that the gasket can be omitted if the surface of the adjacent part is suitable for the raceway surface, and the cylindrical surface of the needle roller and the cylindrical roller used for the DF plane needle roller bearing and the flat cylindrical roller bearing is The profiled surface reduces edge stress and increases service life.
The flat needle roller and cage assembly are the main components of a flat bearing. The needle is held and guided by the radially arranged pockets. The cage profile has a specific shape and is formed from a hardened steel strip. The small size cage is made of industrial plastic.
The high-precision needle roller diameter grouping tolerance is 0.002mm, ensuring uniform load distribution. The flat needle roller and cage assembly is guided by a shaft. Thus, a relatively low peripheral speed can be obtained even if the surface is guided at a high speed.
A particularly space-saving support can be obtained if the adjacent part surface is designed as a raceway surface to dispense with the gasket. If this solution cannot be implemented, the AS series washers made of thin-walled steel can also be compact in design with sufficient support.
The bearing consists of a flat cylindrical roller bearing and cage assembly, a bearing housing locating ring GS and a shaft positioning WS. The 893, 874 and 894 series of flat cylindrical roller bearings can be used for higher loads.
1. The processing of steel balls, the processing of stainless steel balls also varies according to the state of the raw materials. The processes before the frustration or the photosphere can be divided into the following three types. The processes before the heat treatment can be further divided into the following steps. Two kinds of processing, the whole processing process is: stainless steel bar or wire cold punching (some bars need to be punched and annealed after cold pressing) frustration, rough grinding, soft grinding or photosphere heat treatment hard grinding fine grinding or grinding The final inspection group is rust-proof and packaged into the warehouse.
2. The processing of the ferrule: The processing of the inner and outer rings of the bearing varies according to the raw material or the form of the blank. The process before the machining can be divided into the following three types. The whole processing process is: bar or pipe material (Some bars need to be forged and annealed, normalized) Car processing heat treatment Cylindrical grinding processing or polishing parts final inspection anti-rust storage (to be combined with the package)
3. Processing of the cage The processing of the cage can be divided into the following two categories depending on the design structure and raw materials:
(1) Sheet → shear → punching → hot press stamping forming → shaping and fine machining → ultrasonic cleaning machine pickling or shot peening or stringing → final inspection → rust prevention, packaging → storage (to be combined )
(2) Processing of the solid cage: The processing of the solid cage varies according to the raw materials or the gross damage. The following four types of blanks can be divided into the following processing: The bar is Pipe, forgings, castings, inner diameter, outer diameter, end face, chamfering hole (or pull hole, boring), pickling, final inspection, rust prevention, packaging, storage, and assembly.
4. The processing of the roller during the processing of the roller varies according to the raw materials. The process before the heat treatment can be divided into the following two types. The whole processing process is as follows: bar processing or wire cold rolling, string ring and soft grinding Heat treatment string soft point rough grinding outer diameter rough grinding end face end grinding end face fine grinding outer diameter final grinding outer diameter final inspection group anti-rust, packaging into storage (to be combined with the package).
Two: plane bearing:
Planar bearings consist of a planar cage assembly with needle bearings or cylindrical rollers and a flat washer. Needle bearings and cylindrical rollers are held and guided by the planar cage. When used with different series of DF planar bearing washers, many different combinations are available for bearing configurations. The use of high-precision cylindrical rollers (needle rollers) increases the contact length, allowing the bearing to achieve high load capacity and high stiffness in a small space. Another advantage is that the gasket can be omitted if the surface of the adjacent part is suitable for the raceway surface, and the cylindrical surface of the needle roller and the cylindrical roller used for the DF plane needle roller bearing and the flat cylindrical roller bearing is The profiled surface reduces edge stress and increases service life.
The flat needle roller and cage assembly are the main components of a flat bearing. The needle is held and guided by the radially arranged pockets. The cage profile has a specific shape and is formed from a hardened steel strip. The small size cage is made of industrial plastic.
The high-precision needle roller diameter grouping tolerance is 0.002mm, ensuring uniform load distribution. The flat needle roller and cage assembly is guided by a shaft. Thus, a relatively low peripheral speed can be obtained even if the surface is guided at a high speed.
A particularly space-saving support can be obtained if the adjacent part surface is designed as a raceway surface to dispense with the gasket. If this solution cannot be implemented, the AS series washers made of thin-walled steel can also be compact in design with sufficient support.
The bearing consists of a flat cylindrical roller bearing and cage assembly, a bearing housing locating ring GS and a shaft positioning WS. The 893, 874 and 894 series of flat cylindrical roller bearings can be used for higher loads.
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