Bearing steel quenching hardness
(1) Annealing: A heat treatment process in which a metal material is heated to an appropriate temperature for a certain period of time and then slowly cooled. Common annealing processes include: recrystallization annealing, stress relief annealing, spheroidizing annealing, and complete annealing. The purpose of annealing: mainly to reduce the hardness of metal materials, improve plasticity, to facilitate cutting or pressure processing, reduce residual stress, improve the homogenization of the composition and composition, or prepare the tissue for the subsequent heat treatment.
(2) Normalizing: refers to a heat treatment process in which steel or steel is heated to or above (the upper critical point temperature of steel) and is kept at a temperature of 30 to 50 ° C for a suitable period of time. The purpose of normalizing is to improve the mechanical properties of low carbon steel, improve machinability, refine grains, eliminate tissue defects, and prepare for post-heat treatment.
(3) Quenching: refers to heating the steel to a temperature above Ac3 or Ac1 (the lower critical temperature of the steel) for a certain period of time, and then obtaining martensite (or bainite) structure at an appropriate cooling rate. Heat treatment process. Common quenching processes include salt bath quenching, martensite quenching, bainite austempering, surface quenching and partial quenching. The purpose of quenching: to obtain the desired martensite structure of the steel, to improve the hardness, strength and wear resistance of the workpiece, and to prepare the tissue for the subsequent heat treatment.
(4) Tempering: refers to the heat treatment process in which the steel is hardened and then heated to a temperature below for a certain period of time and then cooled to room temperature. Common tempering processes are: low temperature tempering, medium temperature tempering, high temperature tempering and multiple tempering.
The purpose of tempering: mainly to eliminate the stress generated by the steel during quenching, so that the steel has high hardness and wear resistance, and has the required plasticity and toughness.
(5) Tempering and tempering: refers to the composite heat treatment process of quenching steel and steel parts and high temperature tempering. The steel used for quenching and tempering is called quenched and tempered steel. It generally refers to medium carbon structural steel and medium carbon alloy structural steel.
(6) Carburizing: Carburizing refers to a process in which carbon atoms are infiltrated into a steel surface layer. It also makes the low carbon steel workpiece have the surface layer of high carbon steel, and after quenching and low temperature tempering, the surface layer of the workpiece has high hardness and wear resistance, while the central part of the workpiece still maintains the toughness of low carbon steel. Plasticity.https://www.supplyforever.com/
FAG four point contact ball bearing
Four-point contact ball bearings are single-row angular contact ball bearings that can withstand high loads in both directions in the axial direction and can only withstand low loads in the radial direction. In order to ensure low friction, especially at high speeds, it is required to ensure a minimum axial load. The fag four-point contact ball bearing is a double-half inner ring so that as many steel balls as possible can be loaded. The outer ring assembly with the steel ball and the half inner ring can be installed independently, and the bearing self-aligning ability is small. The basic type of fag four-point contact ball bearing is due to the large number of steel balls, the height of the shoulder and the contact angle of 35°.
The four-point contact ball bearing has a high axial load carrying capacity. When the four-point contact ball bearing is used as a thrust bearing, a large matching clearance is left between the bearing seat and the outer ring of the bearing to ensure that it does not bear radial force. The large four-point contact ball bearing outer ring has two positioning grooves for fixing the outer ring (bearing code suffix N2).
The four-point contact ball bearing axial clearance basic type of fag four-point contact ball bearing uses a standard group clearance. Larger clearance groups (code suffix C3) can also be used when needed. FAG Four-Point Contact Ball Bearing Cage Most FAG four-point contact ball bearings feature a machined brass solid cage (code suffix MPA) that is guided by the outer ring. The four-point contact ball bearing code holder of the glass fiber reinforced polyamide 66 is suffixed as TVP. The glass fiber reinforced polyamide cage can be used at a stable temperature of 120 °C. If the bearing is lubricated with oil, if the temperature exceeds 100 ° C, any additives in the lubricant will reduce the life of the cage. Therefore, the oil change cycle must be strictly controlled. The FAG four-point contact ball bearing allows the fag four-point contact ball bearing to operate at high speeds only when the rotational speed is only affected by the axial load.
The four-point contact ball bearing heat treatment heat treatment FAG four-point contact ball bearing operating temperature can reach 150 degrees Celsius, the outer ring diameter greater than 240mm bearing working temperature up to 200 ° C can also maintain the external dimensions. However, it should be noted that the operating temperature of the bearing is limited when the cage material is polyamide.
Railway freight car rolling bearing code
Core Tip: Source: China Railway Network 1, GB/T273-1988 standard notation. The bearing code consists of Chinese pinyin letters and numbers. Front paragraph: numbers and letters, digital representation
Source: China Railway Network
1. GB/T273-1988 standard notation.
The bearing code consists of Chinese pinyin letters and numbers.
The first paragraph: the number and letter composition, the number indicates the clearance series (the basic number is 0 auxiliary number is 1~9), and the letters (B, C, D, E, (F), G) indicate the accuracy level.
Middle section: Seven digits indicate the basic model of the bearing. Seven - width series, six five - structural characteristics, four - bearing model, three - diameter series, two one - inner diameter series.
The following paragraph: (Supplementary code) uses letters and numbers to indicate bearing structure changes and special technical requirements.
SKF - SKF manufacturer code
19——Structural features are sealed double row tapered roller
7——The bearing type is tapered bearing
7——The diameter series is a non-standard series
26——Inner diameter is 26*5=130mm
K1, K2 - change in inner diameter (reduced by 0.5, 1.0)
2. GB/T272-1993 standard notation:
Pre-code: A supplementary code before the basic code. The letters indicate the structural shape of the bearing and so on.
Basic code: is the basis of the bearing code. Indicates the basic type structure and dimensions of the bearing.
Post code: Use the letter (or plus number) to indicate the bearing code, tolerance, material, technical code, and then add the supplementary code after the basic code.
35——Structural features are sealed double row tapered roller bearings
2——Width series code 2
2——diameter series code 2
26——Inner diameter is 26*5=130mm
X2 - width is non-standard series
2RZ - skeletal rubber seal on both ends of the bearing (non-contact)
Check the use of TIMKEN imported bearing grease
Because TIMKEN imported bearings are high-precision products, if the assembly is improper, it is easy to damage the bearing channel, resulting in bearing damage. The bearing should have a special mold during assembly. It can't be beaten at will. When pressing the shaft, it can only be subjected to small force. When pressing the large circle, it can only be subjected to large force. Air pressure or hydraulic pressure is required for assembly. The upper and lower molds should be outside the horizontal state during press-fit. If the tilting causes the bearing channel to be damaged due to the force, the bearing will be audible.
When the bearing is mounted on the rotor for dynamic balance, it is easy to enter the iron filings generated during the dynamic balance into the TIMKEN imported bearing. Therefore, it is better to balance the load before loading the bearing. Some manufacturers have some oil or grease to lubricate the bearing chamber during assembly. However, it is often difficult for the operator to control the amount. If the oil or grease accumulates in the bearing chamber, the bearing is very rotating. Easy to enter the inside of the bearing along the shaft. It is best not to apply oil or grease to the bearing. If it is not painted, it must be controlled to not accumulate in the bearing chamber.
The characteristic of paint rust is that it is mostly in the sealed motor. The sound of the motor is very good when it is assembled. However, after some time is put in the warehouse, the abnormal noise of the motor becomes very large, and the bearing is severely rusted. In the past, many manufacturers thought that it was a bearing problem. After our constant publicity, the motor factory has now realized that it is mainly a problem of insulating varnish. This problem is mainly caused by the fact that the acidic substance volatilized by the insulating paint forms a corrosive substance under a certain temperature and humidity, and the TIMKEN imported bearing is damaged after the channel is corroded. The problem can only be achieved by selecting a good insulating varnish and venting it after drying for a while.
The life of the bearing is closely related to the manufacture, assembly and use. It must be done at every step in order to keep the bearing in optimal operation and prolong the service life of the bearing.
Drop a few drops of oil on the filter paper and take a clean red filter paper. After the lubricating oil leaks, if there is a black powder on the outside, the hand touch has a feeling of resistance, which means that there are many impurities in the lubricating oil. The good lubricating oil has no powder, and the hand is dry and smooth, and has yellow marks.
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Judging standard for inspection and damage of imported bearings
After the bearing is installed, check the operation in order to check if the installation is correct. The small machine can be rotated by hand to confirm whether the rotation is smooth. The inspection items have poor operation due to foreign matter, scratches, and indentations. The installation is poor, the torque generated by the mounting is not stable, and the torque is too large due to too small clearance, installation error, and sealing friction. Wait. If there is no abnormality, the power running can be started.
When disassembling the imported bearing for inspection, first record the appearance of the bearing, confirm the residual amount of lubricant, and after sampling the lubricant for inspection, wash the bearing. As a cleaning agent, gasoline and kerosene are commonly used.
The cleaning of the removed imported bearings is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first so that the bearing does not directly contact the container. When rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.
Fine washing is to carefully clean the bearing while rotating it in the cleaning oil. In addition, the cleaning oil should always be kept clean.
In order to judge whether the removed imported bearings can be reused, check the bearings after cleaning, carefully check the raceway surface, the rolling surface, the mating surface state, the wear of the cage, the increase of the bearing clearance and whether there is any size. Damage and abnormality with reduced accuracy. For non-separable ball bearings, use one hand to support the inner ring and rotate the outer ring to check if it is smooth.
Separate bearings such as bearings can be inspected separately for the raceway surfaces of the rolling elements and the outer ring. Large bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the height, the more careful it is necessary to check.
Large machinery cannot be rotated manually, so the power is cut off immediately after the start of the no-load, the machine is idling, and the presence or absence of vibration, noise, and contact of the rotating parts is checked. After confirming that there is no abnormality, the power is turned on.
The power running starts from the no-load low speed and slowly increases to the rated operation of the specified conditions. The items to be checked during the test run are whether there are abnormal sounds, changes in the temperature of the imported bearings, leakage or discoloration of the lubricant, and the like. If an abnormality is found, stop the operation immediately, check the machine, and remove the bearing check if necessary.
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How to properly maintain SKF bearings
1. When cleaning and removing the bearing, first take a look at the appearance with photography. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings.
a. The cleaning of the bearing is carried out by rough washing and fine washing, and a metal mesh frame can be placed on the bottom of the used container.
b. When rough washing, remove the grease or adhesive with a brush or the like in the oil. At this time, if the bearing is rotated in the oil, be careful that the rolling surface will be damaged by foreign matter or the like.
c. When washing finely, slowly rotate the bearing in the oil and carry out it carefully. The cleaning agent generally used is a neutral non-aqueous diesel oil or kerosene, and a warm alkali liquid or the like is sometimes used as needed. Regardless of which cleaning agent is used, it is often filtered and kept clean. Immediately after cleaning, apply anti-rust oil or anti-rust grease to the bearing.
2, inspection and judgment
In order to judge whether the removed bearing can be reused, it is important to check its dimensional accuracy, rotation accuracy, internal clearance, mating surface, raceway surface, cage and seal. Regarding the inspection result, it can be judged by a person who is using a conventional bearing or a proficient bearing.
The criteria for judgment vary depending on mechanical properties and importance, inspection period, and the like. Bearings must not be reused if they are damaged and must be replaced.
1) Breakage and defects of bearing components.
2) Peeling of the rolling surface of the raceway surface.
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Motor bearing cleaning process
The motor should normally be cleaned and refueled after 2000 hours of use. There are two ways to clean the bearing:
First, the hot oil cleaning method due to the use of a long time, soft dry oil or anti-rust cream hardened bearings, should be immersed in 100-200 ° C hot oil, clamp the bearing with pliers, brush the oil on the bearing clean. The soft dry oil or rust-proof paste is melted when heated to 100-200 ° C, and is easily washed out from the gap of the bearing. Sometimes the bearing is shaken several times in the oil. Oil will also flow away from the gap.
When cleaning the centripetal spherical bearing of the old motor or the imported motor, the ball, the bead frame and the inner ring should be laterally turned out from the outer ring and then immersed in the hot oil. The short cylindrical roller bearing should also be rolled when cleaning. The bead frame, the inner ring and the outer ring are disengaged.
When hot oil is cleaned, the temperature of the oil should not exceed 20 °C. If you use an open flame to directly heat, you should take care to prevent the oil from burning. The bearing should be hung in the oil pan, and the bottom will cause overheating and reduce the hardness.
Second, the general cleaning method put the bearing in kerosene for 5-10 minutes, pinch the inner ring with one hand, and rotate the outer ring with the other hand, the dry oil or anti-rust cream on the bearing will fall. Then put the bearing into the cleaner kerosene, brush it with a soft brush, wash the oil in the ball and the gap, then put it in the gasoline for 1 time, take it out and put it on clean paper. When cleaning the radial spherical ball bearing and the short cylindrical roller bearing, the ball, the bead frame, the inner ring and the outer ring should be disconnected and cleaned.
The cleaning of the bearing mounted on the shaft is mainly by the method of spraying oil or spraying with a grease gun. The oil that is easy to be cleaned is first used with kerosene and then with gasoline; the oil that is difficult to clean is first washed with hot oil of 100-200 °C. Or oil gun spray, then clean with gasoline.
Be careful not to scratch the bearing with a sharp tool: hard grease or rust, so as not to damage the smoothness of the bearing rolling elements and the groove ring. The cleaned bearings are wiped dry with a clean cloth.
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FAG imported bearings are the most critical basic knowledge of installation and maintenance
Unexpected equipment can be stopped when the bearing is damaged. Even if it is an hourly shutdown, it can cause huge production losses due to premature bearing damage, especially capital-intensive production.
Why is FAG imported bearings damaged?
Bearings are precision parts, so they require a very cautious attitude when using them. That is, they use high-performance bearings. If they are used improperly, they can not achieve the expected performance and easily damage the bearings. Therefore, the following matters should be noted when using bearings:
First, keep the FAG 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.
Second, use the installation carefully
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.
Third, use appropriate and accurate installation tools
Try to use special tools and try to avoid using cloth and short fibers.
Fourth, to prevent bearing corrosion
When taking the bearing directly by hand, wash off the sweat on your hands and apply high-quality mineral oil before handling. Pay special attention to rust prevention during the rainy season and summer.
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 lubricant film and the surface damage caused by contaminants is limited. In fact, under ideal conditions, so-called permanent bearing life is possible.
Bearing quality:
Providing worry-free operation for every FAG imported bearing user is our ultimate goal. However, bearing quality alone cannot guarantee worry-free operation. There are other factors that affect the life of each bearing. This includes:
Operating environment:
If the machine is to be in the best condition. Bearings must be properly centered and protected from extreme heat, humidity and contamination.
Install correctly:
With the right installation technology and knowledge and the right tools, the bearings are protected from damage.
Correct maintenance:
Then proper lubrication and maintenance planning and monitoring of bearing conditions are also the focus of the bearing's maximum life.
Worry-free operation:
The concept of worry-free operation is dedicated to the correct service of the bearings and the goal of proper maintenance. The aim is to minimize the risk of downtime caused by the bearings and to ensure that the bearings have all their potential. The existing products and services can help you easily install and maintain the bearings.
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How to lubricate FAG bearings
1. FAG imported bearings have smooth oil bath
Smooth oil bath is the usual smooth way in FAG imported bearings, suitable for the smoothness of low and medium speed bearings. The FAG inlet bearing is partially immersed in the groove, the smooth oil is brought up by the rotating bearing part, and then flows back to the oil groove oil surface should be slightly lower than the center of the lowest rolling element.
2. FAG imported bearings have smooth dripping oil
The drip smooth is suitable for FAG imported bearing parts that need to be quantitatively supplied with smooth oil. The amount of dripping oil is appropriate for every 3-8 seconds. Excessive oil quantity will cause the bearing temperature to increase.
3. FAG imported bearings have smooth circulating oil
The oil pump is used to send the filtered oil to the FAG imported bearing parts, and then filtered and cooled by the smooth oil after the bearing. Because the circulating oil can take away a certain amount of heat and cool the bearing, this method is used for bearing parts with higher rotational speed.
4. FAG imported bearings are spray smooth
The boring shrinking air is mixed with the smooth oil through the sprayer to cause oil mist. In the FAG imported bearings, the air flow can effectively cool the bearing and avoid the intrusion of impurities. This method is suitable for the smoothness of high speed and low temperature bearing components.
5. FAG imported bearings have smooth radiation
The low pressure oil is injected into the FAG inlet bearing through the nozzle by the oil pump, and the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at high speed, the rolling element and the cage also cause airflow around the surrounding air at a relatively high rotational speed. It is difficult to send the smooth oil to the bearing in a smooth manner. In this case, it is necessary to spray the smooth oil with low-pressure radiation. In the bearing, the position of the nozzle should be placed between the inner ring and the center of the cage.
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INA bearing fixing method and lubrication
INA bearing fixing method
INA bearings are fixed parts in machinery. The performance of rolling INA bearings is highly dependent on their material properties. Low-alloy, high-purity, integrally-hardened chrome steel is often used as the material for the manufacture of INA bearing rings and rolling elements. For INA bearings subjected to high impact loads and alternating bending stresses, carburized steel is used.
INA bearings have inner and outer rings. As the world's top INA bearings, how is the fixing method?
1.Axis bearing shoulder fixing
The inner ring of the INA bearing is axially fixed by means of shoulder and interference. Suitable for supporting structures fixed at both ends.
2. INA bearing circlip fixed
The INA bearing inner ring is axially fixed by the shoulder and the lock nut and can withstand small bidirectional axial loads.
3. INA bearing lock nut fixing
The inner ring of the INA bearing is axially fixed by the shoulder and the lock nut, and the retaining washer is loose, safe and reliable.
4.INA bearing end face thrust washer fixed
The INA bearing inner ring is axially fixed by the shoulder and the shaft end retaining ring. The shaft end retaining ring is screwed to the shaft end, and the fixing screw should have a loosening device.
5. INA bearing adapter sleeve fixing
The axial fixation of the inner ring of the INA bearing is achieved by the radial dimension of the inner bore of the adapter sleeve being compressed and clamped onto the shaft.
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KOYO bearing lubricant inspection method
Before we inspect the KOYO bearing, the surface of the KOYO bearing should be cleaned and the parts around the KOYO bearing removed. Oil seals are very fragile parts, so extra care should be taken during inspection and disassembly. Do not apply excessive force to avoid damage to parts. Then carefully check the oil seal of KOYO bearing and its surrounding parts. If it has shown bad symptoms, be sure to replace it. Poor oil seal will cause damage to KOYO bearing, causing KOYO bearing cloud to be abnormal and cause equipment to stop. So KOYO bearings should check those?
The inspection method for KOYO bearing lubricant is:
Apply a little bit of lubricant to the two fingers. If there is any contaminant, feel it. Or apply a thin layer of lubricant on the back of the hand and check the seal.
KOYO bearings lubricated with oil should be refilled with fresh oil and allowed to rotate at low speed for a few minutes if the old oil is drained. As much as possible, allow the oil to collect the contaminants from the wreckage and then vent the oil.
For grease-lubricated KOYO bearings, the replacement of the grease should be avoided with any cotton joints to any part of the KOYO bearing. Since these residual fibers may be wedged between the rolling elements and cause damage, especially for the application of small KOYO bearings, this problem needs to be paid more attention to.
When inspecting KOYO bearings, do not expose KOYO bearings to contaminants or moisture. If the work is interrupted, the machine should be covered with a piece of oil-paper plastic or similar material.
If the unshielded KOYO bearing is cleaned without performing disassembly and may be inspected, it should be cleaned with a brush that is coated with a petroleum solvent and then wiped dry with a lint-free cloth or compressed air.
Do not clean the KOYO bearing with sealing cover or dustproof; just wipe the outer surface. If the KOYO bearing is damaged, it needs to be replaced. Replacing KOYO bearings during regular downtime maintenance is far more economical than the loss of sudden downtime selected due to damage to the array.
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Talking about the proofreading of bearing self-aligning performance
The ability of the rolling bearing to automatically compensate for the relative deflection of the bearing and the centerline of the housing, thereby ensuring the normal working condition of the bearing, is called the aligning of the rolling bearing.
Due to the machining and installation errors of the bearing housing bore and the shaft, as well as the flexural deformation of the shaft after loading, the shaft and the inner and outer ring axes are unlikely to remain coincident during operation, which may cause a certain deflection. Axis deflection will cause an uneven distribution of the internal contact stress of the bearing. Causes early failure of the bearing. Therefore, in general design, the assembly design requirements should be improved as much as possible. For the case where the deformation of the winding is large, the bearing with good centering performance should be selected.
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Talking about the structure characteristics of double row series bearing
The invention of "ball roller bearings" is based on a genius idea, which is a combination of new rolling elements and new assembly methods. All spheres of the traditional rolling "ball" that do not bear the load are removed. This means that 15% of the diameter of the sides of the ball is cut. The result is the so-called ball roller, a flat ball on both sides, which is 30% narrower than the real ball. This significantly saves valuable space.
In addition, such specially shaped "slim" ball rollers and specially developed assembly methods can increase the number of rolling bodies to approximately 90% of the filling space. More rolling elements in the same space allow for higher load ratings for longer product life. This also provides new opportunities to reduce product size and assembly. The dual cage design allows for optimal independent adjustment of the two raceways and is perfectly matched to the application. This ensures maximum load support with minimal bearing size and lower friction.
Rolling bearings fail due to the constant wear of the bearings during the movement. The grease (oil) and the lubrication method are different, which has different effects on reducing the friction and wear of the bearings. Therefore, lubrication technology has become an important part of bearing technology research. Some people refer to grease (oil) as the "fifth part of the bearing" (others are inner ring, outer ring, rolling element, cage).
The resistance to the rotation of the rolling bearing consists of rolling friction, sliding friction and lubricant friction. Rolling friction occurs when the rolling bodies roll on the raceway; the sliding friction occurs on the guide faces of the rolling bodies in the cage, on the rib guide faces of the cage and on the roller end faces and the ferrule ribs in the roller bearings. The friction of the lubricant consists of the internal friction of the lubricant at the contact and the agitation and extrusion of the lubricant. The total friction of a set of bearings, ie the sum of rolling friction, sliding friction and lubricant friction, is the resistance of the impedance bearing movement. The task of studying lubrication technology is to develop different greases (oils) and their lubrication methods to minimize bearing resistance and longest life.
Bearing grease (oil) under common working conditions, foreign advanced industrial countries have completely passed the technology and production, and have formed a series of varieties and batch production capacity. The current main trend is to study the performance of grease under some special circumstances. For example, it is being studied to improve the vacuum stability, creepability and viscosity-temperature performance of perfluoroether grease for aerospace; and, for example, low-temperature grease, although it has good effects in application, its lubrication mechanism does not have a good theory. set forth. For another example, it is studied to use a gaseous lubricant at a high temperature (200 to 4000 degrees).
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How to guarantee the service life of NSK bearings
It is important to keep the NSK bearings and lubrication clean.
Clean the surface of the machine before inspection and then remove the parts around the NSK bearing. The oil seal is a very fragile part, so be careful to disassemble it. Do not apply excessive force. Then carefully check the oil seal and its surrounding parts. If it has shown bad symptoms, be sure to replace it. Poor oil seal will cause NSK bearing. Damage and severe equipment downtime.
Cover the exposed NSK bearings:
When inspecting NSK bearings, never expose NSK bearings to contaminants or moisture. If the work is interrupted, the machine should be covered with a piece of oil-paper plastic or similar material.
If the unshielded NSK bearing is cleaned without performing disassembly and may be inspected, wash it with a white spirit with a brush for application, then dry it with a lint-free cloth or blow it with compressed air. Dry (be careful not to let the NSK bearing assembly start to rotate).
Check the lubricant:
Apply a little bit of lubricant to the friction between the two fingers. If any contaminants are present, feel it, or apply a thin layer of lubricant on the back of the hand, then seal the light.
Replace the lubricant:
Oil-lubricated NSK bearings, after draining the old oil, if possible, refill with fresh oil and allow the machine to spin at low speed for a few minutes. Whenever possible, the oil collects the contaminants from the wreckage and then vents the oil. The oil is preferably filtered before use.
Grease-lubricated NSK bearings should be replaced with a cotton joint to any part of the NSK bearing when replacing the grease, as these residual fibers may wedge between the rolling elements and cause damage. In particular, the application of small NSK bearings needs to pay attention to this problem.
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Characteristics of grease performance in motor NTN bearings
Good adaptability, high and low temperature performance, common in indoor and outdoor, north and south.
The suitable consistency has a good damping effect, which can reduce the noise of the motor NTN bearing and is beneficial to environmental protection.
Good fluidity, generally requires the use temperature is -25 °C - 120 °C, the starting torque is small, the running torque is low, the power consumption is small, and the temperature rise is low.
The insulation grade is A, E, B grade, and must not contain sulfur or chlorine extreme pressure additives.
The anti-oxidation performance is good. After long-term use, the appearance color and acidity of the grease change little, and there is no obvious oxidation phenomenon.
Long service life, extended maintenance cycle and reduced NTN bearing consumption.
It has strong rust and salt spray resistance and good water resistance, which can be used in harsh working environments.
Good lubricity and abrasion resistance, no oil, no drying, no emulsification, no loss, the grease itself should not contain solids.
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Imported bearing maintenance knowledge
Some of the imported bearings in the warehouse are not standardized or have no outer packaging, ranging from a few yuan to a set of three or four thousand yuan. These bearings are exposed on the shelves, and the temperature of the warehouse is high. The butter originally applied to the bearings for lubrication and maintenance has been dried, which accelerates the rust of the bearings and will affect the use of our products. In response to this situation, the supply organization organizes the cleaning and maintenance of these bearings.
Maintenance is divided into the following steps:
1. First put the bearing into the gasoline to clean, wipe off the sludge and dust left on the bearing. All the rusted bearings are gently wiped with metallographic sandpaper until there is no rough feeling by hand.
2. Dry the cleaned bearing with a dry rag and place it in anti-rust oil. In this process, the bearing should be completely in contact with the anti-rust oil, and the bearing should not be rotated, so that the oil film formed by the anti-rust oil can cover the surface of the bearing to achieve the purpose of anti-rust.
3, the next use of lithium grease? With butter? Need to be evenly applied to the surface of the bearing, including the inner and outer rings, wheels, cage. And it is to rotate the bearing while wiping, so that the butter really enters the inside of the bearing and fully lubricates.
4. The last process is packaging. In order to save costs, we “turn waste into treasure”, cut the cement packaging bags that have been scrapped in the warehouse into suitable packaging bags, pack and pack the bearings, mark the bearing specifications and put them back on the shelves.
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Bearing inspection failure and troubleshooting
The first is to identify and check the sound of the rolling of the imported bearings. We can use the sounder to check the size and sound quality of the rolling bearings in the running.
Secondly, the vibration of the imported bearing in the work is identified and inspected. The vibration can be measured by using a special imported bearing vibration measuring device (frequency analyzer, etc.), and the specific situation of the abnormality cannot be inferred by the frequency.
Finally, it is checked according to the temperature of the imported bearing. The temperature of the imported bearing is generally estimated based on the temperature of the outdoor surface of the imported bearing. If the oil hole can directly measure the temperature of the bearing outer ring, it is more suitable.
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Analysis: The form of early bearing damage
This natural damage is unavoidable during normal use of the bearing due to wear and tear until it eventually loses its ability to work and ends its service life. However, if the bearing is prematurely worn or damaged due to improper adjustment of the engine assembly, poor quality of the lubricating oil or poor use conditions, it is an early damage caused by man.
Early damage not only greatly reduces the service life of the bearing, but also affects the normal operation of the engine. According to the long-term experience of diesel engine maintenance, the common forms of early damage of sliding bearings are mechanical damage, bearing cavitation, fatigue pitting, corrosion and so on.
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Method of disassembling a bearing cap of an electric motor
1. The bearing cover is very easy to remove. Just remove the screws that fix the bearing cover and remove the front and rear bearing covers. The front and rear bearing covers should be marked with a mark to avoid mis-assembly before and after assembly.
2. The assembly method of the bearing cover is: insert the outer cover through the rotating shaft outside the end cover, insert a screw, hold the screw with one hand, turn the shaft with one hand, and then turn the bearing inner cover to the outer cover. When the screw holes are aligned, the screws can be inserted into the screw holes of the inner cover and tightened. Finally, the other two screws are also tightened.
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Cobblestone crusher bearing lubricant selection skills
1, anti-rust performance
The grease used in the bearing must have an anti-rust effect, and the anti-rust agent is preferably insoluble in water. Grease should have good adhesion and form an oil film on the surface of the steel.
2, mechanical stability
Grease becomes soft during machining and causes leakage. In normal operation, grease will be trapped inside the bearing by the bearing housing. If the mechanical stability of the grease is insufficient, during the operation, the structure of the soap of the grease will mechanically disintegrate, causing the grease to be destroyed, thereby losing the lubricating effect.
3, oil seal
Oil seals are necessary barriers to protect bearings and lubricants from external contamination. During the operation of the bearings, no matter whether debris or moisture can penetrate into the bearings to prevent damage.
Proper installation and maintenance is an important factor in the longest service life of the bearing. At the same time, attention must be paid to the cleanliness of the bearings, the correctness of the choice of bearings and the selection of appropriate installation and maintenance tools. In addition, the bearings must be protected from contamination and moisture and ensure proper installation and lubrication.
4, mixed grease
Never mix incompatible greases. If two incompatible greases are mixed, the consistency will usually soften and eventually the bearings may be damaged due to the loss of grease. If you do not know which grease the bearing originally used, you must completely remove the old grease inside and outside the bearing before adding new grease.
5, the classification of oil
Mainly according to temperature and working conditions: grease can be classified according to their allowable working temperature. The consistency and lubricating ability of grease are affected by working temperature. Bearings operating at a certain temperature must choose the correct consistency at the same temperature. Grease with good lubrication. Grease is manufactured in different operating temperature ranges and can be roughly classified into low temperature, medium temperature and high temperature greases. At the same time, there is a type of grease called extrusion resistance or extrusion resistance and the addition of molybdenum disulfide, and at the same time, an additive is added thereto to strengthen the strength of the lubricant film.
6, the important factor in the choice of oil
If the grease is wrongly selected, all measures to prevent the bearing are futile. It is important to choose a grease whose base oil viscosity provides sufficient lubrication at the working temperature. The viscosity is mainly affected.
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