How to choose the rolling clearance of sunthai bearings?

Core Tip: Clearance is an important factor in the normal operation of sunthai bearings. Choosing the right sunthai bearing clearance allows the load to be distributed between the rolling elements; it can limit the axis (or
Clearance is an important factor in the normal operation of sunthai bearings. Choosing the appropriate sunthai bearing clearance can make the load distribution between the rolling elements reasonable; can limit the axial and radial displacement of the shaft (or casing) to ensure the rotation accuracy of the shaft; make the sunthai bearing can be normal at the required temperature. Work; can reduce the vibration and noise of sunthai bearing work, it can be seen that sunthai bearing clearance has a great influence on sunt bearing life, temperature rise, vibration and noise. In the selection of sunthai bearing clearance, in addition to the working conditions of the sunthai bearing (such as load, speed, temperature, etc.) and the performance requirements of sunthai bearings (such as friction torque, vibration and noise, rotation accuracy, etc.) Should consider:
  1. The interference fit between the sunthai bearing and the shaft and housing results in a reduction in play;
  2. When the sunthai bearing is working, the temperature difference between the inner and outer rings causes the clearance to decrease;
3. The material of the shaft and the outer casing is reduced or increased due to the difference in expansion coefficient.
Experience has shown that the optimum working clearance for a ball sunthai bearing is approximately zero; a small amount of working clearance should be maintained for the optimum working condition of the roller sunthai bearing. In components that require good support rigidity (such as machine tool spindles), there may be a certain amount of preload.

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Maintenance bearing small note

Core Tip: Some parts of 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 in the warehouse is high.
Some of the outer packagings 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, butter should 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, wrap the bearings tightly, wrap them, label the bearing specifications and put them back on the shelves for storage.

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Main aspects of regular maintenance inspection of IKO full complement cylindrical roller bearings

Regular inspections of IKO bearings are important for maintaining the best condition of a fully loaded cylindrical roller bearing and can also reveal problems. Matters and related knowledge about the use of bearings in use.
First of all, we want to emphasize that it is important to keep the IKO bearings lubricated and clean. Therefore, before we inspect the full complement cylindrical roller bearing, we should clean the surface of the bearing and then remove the parts around the bearing. It should be noted that the oil seal is a very fragile part, so extra care should be taken during inspection and disassembly. Do not apply excessive force to avoid damage to the parts. Then carefully check the bearing's oil seal and its surrounding parts. If it has been shown to be a bad symptom, be sure to replace it. A bad oil seal will cause damage to the bearing, causing the bearing cloud to be abnormal and causing the machine to stop.
Second, we also check the lubricant of IKO bearings. Lubrication is important, not for full complement cylindrical roller bearings, but for all bearings. However, please note that it is not advisable to add too much grease to the bearings.
Cleaning of IKO bearings: Gasoline and kerosene are commonly used as ordinary cleaning agents. When disassembling the lower bearing for inspection, first record the appearance of the full complement cylindrical roller bearing, confirm the residual amount of the lubricant, and start the washing of the bearing after sampling the lubricant for inspection. The cleaning is divided into coarse cleaning and fine cleaning, respectively placed in the container, and the metal mesh bottom is first placed so that the bearing does not directly contact the container dirt.
1. Rough cleaning, use brush to remove grease and adhesive, and after it is almost clean, transfer to fine washing. If the full complement cylindrical roller bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted.
2, fine fine washing, is to fill the full complement of cylindrical roller bearings in the cleaning oil while carefully cleaning. In addition, the cleaning oil should always be kept clean.
IKO bearing inspection and judgment: In order to judge whether the removed bearing can be used, it should be checked after the full complement cylindrical roller bearing is cleaned.

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The importance of grease in the maintenance of nsk tapered roller bearings

In order to determine whether the disassembled nsk tapered roller bearing can be used, it is necessary to check after the bearing is cleaned. Check the condition of the raceway surface, the rolling surface, the mating surface, the wear condition of the holding frame, the increase of the bearing clearance, and the damage and abnormality caused by irrelevant dimensional accuracy. For non-detached small ball bearings, use one hand to support the inner ring and rotate the outer ring to confirm whether it is fluent.
Overhaul of the bearing: Cleaning of the bearing: When disassembling the nsk tapered roller bearing for maintenance, first record the appearance of the bearing, confirm the residual amount of the smoothing agent, and then wash the bearing after sampling the smoothing agent. As a cleaning agent, gasoline and kerosene are commonly used.
Outside the bearing industry, the type of grease used is the largest high-speed wire rod mill bearing, accounting for about 70% of the amount of grease used. Because the grease of this type is made of soft white, light and difficult to filter lithium-white thickener, using mineral oil as the base oil, it is very difficult to know the requirements of low-end bearings to reduce the vibration value. Another benefit is that there is no inferior pumping, whether it is mechanical fatliquoring or manual grease, it is simple and difficult. Moreover, the grease is inexpensive and can greatly reduce the cost of the nsk tapered roller bearing. However, due to the use of mineral essential oils, the greases are being combined with some physical and chemical targets other than rust and rust prevention. If the bearing life can only reach 200 hours, the linear guide is a common problem. The starting and running torques are no problem when tested at -20 °C. The grease utilization temperature is generally -20 to 120 ° C. When it is used at a high temperature of 150 ° C or higher, the fundamental oil evaporates too quickly, and the phenomenon of severe flow is greatly reduced, thereby greatly shortening the service life of the bearing.
1. The bearing oil bath is smooth
Smooth oil bath is a common smooth way in bearings, suitable for the smoothness of low and medium speed bearings. The nsk tapered roller 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. The smooth drop of the bearing
Smooth drip is suitable for nsk tapered roller bearing parts that need to be quantitatively supplied with smooth oil. The amount of oil dripping is preferably every 3-8 seconds. Excessive oil quantity will cause the bearing temperature to increase.
3. The bearing's circulating oil is smooth
The oil is pumped to the bearing components by an oil pump, and then filtered and cooled by the smooth oil after the nsk tapered roller 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. The bearing spray is smooth
The use of boring shrinking air is mixed with smooth oil through a sprayer to create an oil mist. In the radial bearing, the air flow can effectively cool the bearing and prevent the intrusion of impurities. This method is suitable for the smoothness of high speed and low temperature bearing components.
5. The bearing's radiation is smooth
The low pressure oil is injected into the nsk tapered roller 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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Basic method for maintenance of industrial INA self-aligning ball bearings

  In order to maintain the original performance of the INA bearing in a good condition for as long as possible, maintenance, overhaul, and accident prevention are required to ensure the reliability of operation and improve productivity and economy. Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The content includes monitoring of operating conditions, replenishment or replacement of lubricants, and periodic disassembly inspections. As a maintenance item during operation, there are bearing rotation sound, vibration, temperature, lubricant state, and the like.
Cleaning of the bearing: When disassembling the ball bearing, check the appearance of the bearing, confirm the residual amount of the lubricant, and wash the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used.
The cleaning of the removed INA bearing is divided into coarse cleaning and fine cleaning. They are placed in the container respectively, and the metal mesh bottom is placed first so that the bearing does not directly contact the container. In 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.
Bearing inspection and judgment: In order to judge whether the removed bearing can be used, it should be checked after the INA bearing is cleaned. Check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase in the clearance of the self-aligning ball bearing, and the damage and abnormality with irrelevant dimensional accuracy. For non-separable miniature ball bearings, use one hand to support the inner ring horizontally and rotate the outer ring to check if it is smooth.
Separate bearings such as INA bearings can be inspected separately for the rolling 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, and ribs. The higher the importance of bearings, the more careful inspection is required.
Grease has a very important protective effect on the bearing. In order to better play the lubrication effect of the grease on the bearing, we need to refer to six standards:
    First: classification and selection of oils; mainly according to temperature and working conditions: oils and fats can be classified according to their allowable working temperature. The consistency and lubricating ability of oils are affected by working temperature, and one-way operation at a certain temperature. Bearings must be selected to have the correct consistency and good lubrication at the same temperature.
    Second: anti-rust performance; the grease used in the INA bearing must have 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.
    Third: the viscosity of grease; if the wrong choice of grease, all measures to prevent self-aligning ball bearings are futile, choose a kind of grease, its base oil viscosity is able to provide sufficient lubrication at working temperature is very important, the viscosity is mainly It is affected by temperature, it drops as the temperature rises, and it rises when the temperature drops.
    Fourth: mechanical stability; grease will become soft during machining, resulting in 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.
    Fifth: Do not mix grease; never mix incompatible greases. If two incompatible greases are mixed, the consistency will usually become soft. Finally, the INA bearing may be damaged due to the easy loss of grease.
    Sixth: The oil seal should be strict; the oil seal is a necessary barrier to protect the self-aligning ball bearing and lubricant from external pollution. During the operation of the bearing, no matter whether the debris or moisture can penetrate into the bearing, it will prevent it from breaking.

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What factors should be considered for fatigue failure of INA thrust tapered roller bearings?

INA bearing fatigue failure is a failure of the surface form, mainly manifested by fatigue crack initiation, expansion and fracture processes, and metal damage caused by the long-term effects of load failure. Sealed thrust tapered roller bearings are lubricated with specially tested high quality lithium grease. This grease can withstand a high temperature of 120 degrees in a short time. If the stable operating temperature reaches 70 degrees or higher, the life of standard lithium grease will be shortened.
Frequent use of high temperatures indicates that an abnormal condition has occurred. High temperatures are also harmful to the lubricant of the bearing. Sometimes the INA bearing overheating can be attributed to the lubricant of the bearing. Long-term continuous rotation of the bearing at temperatures above 125 °C will reduce the life of the thrust tapered roller bearing. Causes of high temperature bearings include: insufficient lubrication or excessive lubrication, lubricants. Contains impurities, excessive load, bearing damage, insufficient clearance, and high friction caused by oil seals.
When selecting the INA bearing seal form, consideration should be given to the type of lubricant of the imported bearing, the circumferential speed of the sealing contact surface, the bearing mounting error, and the like. Non-contact sealing devices can be selected when the sealing requirements are not high, the rotational speed of the thrust tapered roller bearing is high, and the mounting error of the shaft is too large. For the non-contact sealing device, if the sealing effect is to be enhanced, a centrifugal piece or a stagnation piece may be added to the non-contact sealing, and the discharge amount of the grease may be controlled by centrifugal force to achieve a sealing effect. If the working environment is bad and there is a possibility of moisture infiltration, a contact seal can be used for the support part. What factors should be considered for fatigue failure of INA thrust tapered roller bearings?

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How to distinguish the quality of TIMKEN bearings

       The first thing to judge is whether the TIMKEN bearing outer packaging is clear: whether the packaging is clear or not. Under normal circumstances, the factory brand has its own special designer to design the outer packaging. It should be able to identify it carefully and arrange production. The factory that passes through the conditions is produced and produced, so the packaging is very clear and unambiguous, from line to color. Some manufacturers still have some special identifiers, so pay attention to
Then listen to the TIMKEN bearing for noise, hold the TIMKEN bearing body sleeve, and turn the jacket to make it rotate to hear if there is any noise. This is the biggest difference from the standard manufacturer of TIMKEN bearings and machine-operated brands. Most of the counterfeit products are out of production conditions, and they are completely hand-worked. In the production process, impurities such as sand are inevitably incorporated into the TIMKEN bearing body, so they will make noise when rotating. The next step is to see if there are turbid oil marks on the surface. Pay special attention when purchasing TIMKEN bearings.
At present, the domestic anti-rust technology is not mature enough, so it is easy to leave a thick oil trace when the TIMKEN bearing body is rust-proofed, and the original imported TIMKEN bearing can hardly see the trace of anti-rust oil, if you are Experts, smell the taste of TIMKEN bearings, can also smell anti-rust oil, just can't see it. Finally, see if the chamfer is even, that is, the intersection of the horizontal and the vertical, the fake TIMKEN bearing has no high-tech equipment due to the limitation of production technology, so it will be handled poorly in these corners. Observing is not difficult to see.
Then check whether the steel stamp is clear, and the brand name and label will be printed on the TIMKEN bearing body. The font is very small, but most of the products produced by the factory use the stamping technology, and the type is pressed before the heat treatment, so the font is small, but it is concave-deep and very clear. If it is a counterfeit product, its font is very vague, because the printing technique is rough, the font floats on the surface, and some can even be easily wiped off with a wet cloth or hand.

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Analysis of the causes of burns in INA bearings

      The so-called INA bearing burn injury state means that the INA bearing's race wheel, rolling element and cage are heated rapidly during rotation until discoloration, softening, welding and damage.
The main cause of burns in INA bearings is the poor lubrication of INA bearings, the possibility of using irregular lubricants, or too many lubricants, too few, are incorrect. For information on INA bearing lubrication, please refer to the introduction of the two articles "The Misunderstanding of Lubricating Grease in Repairing FAGINA Bearings" and "Introduction to Lubrication Technology in INA Bearings".
Secondly, it may be an excessive load (preload is too large). The speed is too high. The play is too small. There is water or other foreign matter invading. If the above two cases are not the case, the accuracy of the shaft, the INA bearing housing is poor, and the deflection of the shaft is large. Seeing this, I think everyone wants to know the solution. First, we should study the lubricant and lubrication method, choose the INA bearing lubricant, and its dosage, and correct the choice of INA bearing. Research should be coordinated, INA bearing clearance and preload, and improved sealing. Check the accuracy of the shaft and INA bearing housing. Of course, if you have an expert next to you, let him operate and learn the best!
It is recommended to pay attention to the installation, lubrication, clearance and other aspects of the INA bearing when using it as accurately as possible.

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Lubrication bearing repair method

Lubrication of bearing repair: Lubricating lubricant inside the bearing can be divided into oil and grease.

Repair method: preparation: dry towel, sharp tongs, NSK bearing cleaning night, smooth bearing oil or smooth grease.

1. Dirty: Take the bearing from the cleaning solution, and wipe the cleaning solution with a dry towel, then dry it in a cool place.

2, bearing cleaning fluid: the bearing is immersed in the bearing cleaning fluid bought in the market, and swinging at this time, the foreign matter inside the bearing will be swayed in, and some supermarkets buy ultrasonic cleaning machine is also very sponsored to eliminate foreign objects .
3. Inject the smoothing agent into the bearing according to the trend, inject grease or oil into the bearing, and cover the cover with a new C-shaped ring.
4. Remove the C-shaped ring and the cover: wipe off the dirty color inside the bearing with a dry towel, then use the pointed pliers to lift the side of the C-shaped ring and take the C-shaped ring and the cover.
5. Detection: For the bearing that has been assembled into the original condition, grasp the inner ring with fingers and turn it several times.
Other ways:
1. Improve gear accuracy.
2, increase the resistance, choose a smooth oil with a large viscosity.
3. Adjust the gap.
4. Grinding gears to improve the precision of the meshing.

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Talking about the Application of Self-lubricating Bearings in Casting

Self-lubricating bearings have a wide temperature range, sufficient solid lubricant content, uniform release, good self-lubricating properties and occlusion, which can effectively protect the journal and achieve long-lasting use. It is suitable for operation in high temperature, low speed, heavy load, large dust, water shower and impact vibration. It can be widely used in the rolling of mining machinery, metallurgy, petroleum, chemical, food, textile, paper, printing and dyeing machinery and equipment. And sliding bearing parts.
      The aluminum liquid produced by the aluminum electrolysis cell is sucked out by vacuum lifting and then poured into the mixing furnace. After the proportioning and slag removal, it flows into the aluminum ingot casting machine for casting, and the formed solid is called aluminum ingot, and the produced aluminum is produced. The ingots are stacked by a stacker. In order to improve production efficiency, the aluminum ingot must be cooled with a large amount of cooling water before molding, and the huge heat of the aluminum liquid is released into the cooling water during the cooling process to generate hot water vapor.
v Casting machine bearings are in high temperature and water vapor environment. Many bearings are greased. The added grease will be melted and overflowed due to high temperature in a short time. It is difficult to maintain and maintain, and the surface of the equipment is difficult to wipe. Further, the steel structure bearing is easy to corrode and rust in a hot and humid environment, the failure rate is very high, the equipment maintenance cost is high, and the equipment operation is often troubled by the following two problems.
      It is difficult to realize high-temperature continuous operation of the oil supply operation. The ingot, ingot, ingot, and ingot are installed in the unit casing. Each rotating bearing is designed with a grease fitting that periodically injects grease. Remove the housing and use a grease gun to pressurize the grease. And the whole machine has more than 30 oil injection points. The long-term operation and maintenance can not achieve this cumbersome oil filling operation. It is only necessary to hold the thin oil pot and pour it on the outside of the running bearing sleeve. It is difficult for the lubricating oil to enter the friction pair of the bearing. Some of the bearings are in a frictional state.
      High ambient temperature, grease lubrication is not suitable for the current casting machine rolling bearing used in the molybdenum disulfide grease is considered to be resistant to high temperature grease, we know that its base oil is a petroleum product, add a small amount of high temperature resistant molybdenum disulfide additive, its temperature limit That is 120 ° C. According to the test, the working temperature of the casting machine bearing can reach 200 °C, which has far exceeded the temperature limit of grease.
      Under such high temperature conditions, the base oil in the grease will become thinner and gradually evaporate, and the remaining carbon residue, molybdenum disulfide and dust will be mixed into a solid block to solidify on the cage of the rolling bearing, which not only loses its lubricating effect, It also hinders the normal operation of the rolling bearing and wears out quickly. It takes up to 2 weeks to stop, and removes the bearing to clean the grease.

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Domestic and foreign bearing test methods

At present, there are four main bearing test methods at home and abroad: 1. friction and wear test, second, test bench test, third, test room (test field) simulation test, and fourth, actual working condition operation test.

Foreign countries have used the above several test methods, but the application purpose is different. For example, to develop a brand new product, firstly, a friction and wear test must be performed. However, if there is not much change in the form of friction and wear, only the product size and load conditions change, only the bench, simulation or actual running test is needed. Foreign countries have very strict assessments of new products (such as car wheel bearings, etc.) in key parts, and must be tested in actual operation before they can be approved for use. Swedish SKF bearings, Japan NTN bearings, newly researched bearing simulation test technology, can only replace benches, simulations or experiments, to shorten the time of product design, speed up the progress of product development, but there is still a gap from the actual operation. At present, China's bearing industry has carried out friction and wear tests, only one of Luoyang Bearing Research Institute; has carried out bearing bench test, including Luoyang Bearing Research Institute, Shanghai Axis Research Institute, Hangzhou Bearing Test Center and Wafangdian, Harbin, etc. Yujiaguo has bearing enterprises; Luoyang Bearing Research Institute, Hangzhou Bearing Test Center, Luozhou, Xenxi and other enterprises can be launched for simulation test. In order to carry out the actual test, the bearing manufacturer will only carry out the requirements when the supporting mainframe enterprise puts forward this aspect, such as the wheel bearing of the railway passenger wheel to the bearing and the car. In short, the domestic implementation of simulation and actual operation test is not extensive, and should further expand the scope of the host or the actual working conditions, and prepare sufficient software and hardware for the simulation test to mention the schedule as soon as possible.

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