What is a ball bearing?
All ball bearings have a "dot" contact between the ball and the raceway. It is because of this point contact that a larger ball bearing is required for the same bearing capacity as compared with a tapered roller bearing that distributes the pressure over the entire length of the stick (line contact).
A common ball bearing is a "deep groove ball bearing" which is only suitable for light radial loads and is not suitable for axial or impact loads as it can damage the bearings. It is also important to ensure that the lubricant is “clean”. Impurity contamination will cause blockage of the raceway and affect the performance and life of the bearing.
Material use and installation method of FAG imported bearings
Quality control of both bearing manufacturing and steel quality is a guarantee of product quality stability.
FAG imported bearings http://www.skf-fag-nskcn.com are made of alloyed alloy steel or carbon steel refined by electric furnace. The steel used for FAG bearings is basically low carbon carburized steel. However, there are special cases where high carbon high quality bearing steel which is case hardened or hardened is required. Due to the different bearing sizes produced, it is necessary to add an appropriate amount of alloying elements in the molten steel to ensure the best performance of the finished product.
When using low carbon steel, after machining, carbon will penetrate into the surface of the bearing component, which is deep enough to form a hardened outer shell to withstand the bearing load. This carbon and early alloying elements ensure hard and fatigue resistant. The perfect combination of exterior and sturdy and soft core. High carbon steel does not require carburization and can be surface hardened, usually by induction heat treatment, or hardened by conventional methods.
Another advantage of tapered carburized steel for surface carburized steel is the residual compressive stress in the surface layer. These compressive stresses delay the expansion of fatigue cracks near the bearing raceway and roller surface, and increase the bending at the large rib groove. Fatigue strength. The robust and tough shaft core of FAG's imported bearings uses bearings to increase the ability to withstand heavy loads without damage. FAG Imports has conducted extensive research on the performance and life of bearings in the company to determine the optimum combination of optimum steel composition and heat treatment.
Bearings used under normal operating conditions can be used in the following situations:
1. The maximum temperature of 12 ° C to 150 ° C allows the temperature to be temporarily increased to 175 ° C.
2. The lowest ambient temperature is about -50 °C.
3. The highest Hertz contact pressure is 2100 to 3100 MPa.
Introduction to the cause of corrosion of IKO oil-free bearings and methods for preventing corrosion
Oil-free bearings use water-soluble cutting fluids, and users must work harder on machine maintenance and management to control erosion and even eliminate erosion. In order to prevent water from eroding the metal surface, the machine tool should always be fully lubricated and greased on important parts of the machine tool.
Oil-free bearings can have a long life under accurate use. If the damage is too early, it may be caused by improper selection, improper use or poor lubrication.
Therefore, when installing IKO bearings, we need to record the type of machine, the installation location, the premise of use and the nearby cooperation. Through research to summarize the type of bearing damage, the use environment when the problem occurs, to avoid similar situations happen again.
Correctly control the concentration of the cutting fluid. When the machine is shut down, use the cutting fluid to clean the surface of the machine, and open the machine cover to dissipate the humid air in the working area of the machine. To prevent the occurrence of electrical corrosion, a layer of waterproof grease should be applied to the metal surface. Moreover, the machine tool should be grounded strictly. It is not enough to ground the electrical cabinet only. To avoid the breeding and breeding of bacteria, the cutting fluid should be cleaned or replaced on time, the chips should be removed in time, and soft water (pure water with low mineral content) should be used. Diluted the cutting concentrate.
In addition to excellent quality, oil-free bearings are also very precise parts. They are high-performance bearings. If they are used improperly during use, they will not achieve the expected functional effects, and it will easily damage IKO bearings. I have definitely paid attention to it.
For more information and purchase please visit: https://www.supplyforever.com
Judging the fault maintenance method of IKO high temperature bearing in use
High temperature bearings exhibit strong regularity during their use and are very repeatable. Normal high-quality bearings are relatively small in 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 motion, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency. There are very few spectrums above the power frequency, and the IKO bearing state is very stable and enters a stable working period.
After continuing to run, the bearing vibration and noise begin to increase, and sometimes abnormal sounds occur, but the vibration increase changes slowly. At this time, the bearing kurtness value suddenly reaches a certain value. We believe that the bearing is an initial failure at this time.
At this time, it is required to closely monitor the high temperature bearing and pay close attention to the change. After that, the bearing kurtosis value begins to drop rapidly and approaches the normal value, while the vibration and noise begin to increase significantly, and the increase rate begins to accelerate. When the vibration exceeds the vibration standard (such as ISO2372 standard), the bearing kurtosis value also begins. Rapid increase, when both the vibration standard and the kurtosis value exceed the normal value (the available kurtosis relative standard), we believe that the IKO bearing has entered the late fault production, and it is necessary to repair the equipment and replace the bearing in time.
Swedish high-temperature bearings show late failure characteristics to serious failures (generally bearing damage such as axles, burns, sand cracks, raceways, bead wear, etc.) are not more than one week, the larger the equipment capacity, the faster the speed The shorter the interval. Therefore, in the actual IKO bearing fault diagnosis, once the late fault characteristics are found, the bearing should be judged decisively and the repair should be arranged as soon as possible.
The use factors mainly refer to whether the installation adjustment, use and maintenance, maintenance and repair, etc. meet the technical requirements. According to the technical requirements of bearing installation, use, maintenance and maintenance, monitor and check the load, speed, working temperature, vibration, noise and lubrication conditions of the IKO bearing in operation, find the cause and find the cause immediately, and make adjustments. It returned to normal.
For more information and purchase please visit: https://www.supplyforever.com
Wheel KOYO bearing installation, use common sense
The largest number of wheel bearings for cars used in the past was the use of single row tapered roller or ball bearings in pairs. With the development of technology, car hub units have been widely used in cars. The range and use of hub bearing units is increasing, and has now reached the third generation: the first generation consists of double row angular contact bearings. The second generation has a flange for fixing the KOYO bearing on the outer raceway. The KOYO bearing can be simply placed on the axle and fixed with a nut. Make the maintenance of the car easier. The third-generation wheel bearing unit is equipped with KOYO bearing unit and anti-hold brake system. The hub unit is designed with an inner flange and an outer flange, the inner flange is bolted to the drive shaft, and the outer flange mounts the entire KOYO bearing together.
Worn or damaged wheels KOYO bearings or hub units can cause unsuitable and costly failures in your vehicle's journey, even causing damage to your safety. Please pay attention to the following items during the use and installation of the hub bearing:
1. In order to ensure maximum safety and reliability, it is recommended that you always check the wheel KOYO bearing regardless of the length of the car - pay attention to whether the KOYO bearing has early warning signs of wear: including any friction noise or suspension combination wheel Unnormal deceleration during cornering.
For rear-wheel-drive vehicles, it is recommended to lubricate the front wheel hub KOYO bearing when the vehicle travels to 38,000 km. When replacing the brake system, check the KOYO bearing and replace the oil seal.
2. If you hear the noise from the bearing parts of the hub, first of all, it is important to find the location where the noise occurs. There are many moving parts that may produce noise, or some rotating parts may come into contact with the non-rotating parts. If it is confirmed that the noise is in the KOYO bearing, the KOYO bearing may be damaged and needs to be replaced.
3. Because the working conditions of the front wheel hub causing the failure of KOYO bearings on both sides are similar, it is recommended to replace them in pairs even if only one KOYO bearing is broken.
4, the wheel bearing is more sensitive, in any case need to use the correct method and the right tool. KOYO bearing components must not be damaged during storage and installation. Some KOYO bearings require a large pressure to press in, so special tools are required. Be sure to refer to the car manufacturer's instructions.
5, when installing KOYO bearings should be in a clean and tidy environment, the entry of fine particles into KOYO bearings will also shorten the service life of KOYO bearings. It is very important to maintain a clean environment when replacing KOYO bearings. It is not allowed to hit the KOYO bearing with a hoe. Note that the KOYO bearing should not fall to the ground (or similarly handled improperly). The condition of the shaft and the housing should also be checked before installation. Even slight wear can cause poor fitting and cause early failure of the KOYO bearing.
Method for reducing NSK bearing noise and maintenance and maintenance
(1) Using a vibration absorbing or vibration isolating device
The simplest example is a radial ball NSK bearing that can withstand thrust at high speed instead of a thrust NSK bearing. It can be fitted with a plastic jacket filled with anti-rust lubricant on its outer ring, a thrust NSK bearing with a casing or a general thrust NSK. The bearing, if permitted, is fitted with the same plastic sleeve in its inner or outer circumference, but the control must not rub or interfere with adjacent parts during rotation. This method has a certain muffling effect.
The use of vibration absorption or vibration isolation devices to reduce NSK bearing noise or isolate NSK bearing noise can achieve good results, but this often costs a lot of money, sometimes the mechanism becomes larger, the heat dissipation conditions become worse, or it is easy to rust. To be fully considered, this law will only be used after the other measures have not been adopted to achieve low noise indicators.
An example is the use of a sound-absorbing sound enclosure to completely enclose or substantially block the noise-generating NSK bearing system. The inside of the noise reduction cover is made of glass fiber or polyurethane foam, and the inner surface is a steel plate with a thickness of 0.6-lmm. The surface is uniformly distributed with small through holes of φ1.2-1.5mm, and the total area of the small holes accounts for the entire inner surface. 25% to 30% of the surface, and the outer surface is a steel plate having a thickness of 2 mm.
Another example is to add an intermediate sleeve between the NSK bearing and the seat hole to attenuate the vibration force transmitted by the rotating system to the NSK bearing seat, but this requires proper deployment, otherwise the opposite effect may occur.
Here glass fiber or foam is used to eliminate higher frequency noise, the inner surface with small holes is used to eliminate lower frequency noise, and the thick steel plate on the outer surface is used to isolate the noise from the outside.
(2) Method of changing the rotational speed of the corresponding part of the host
In order to reduce the noise of the oil pump system, the oil pump that was originally used at a motor speed of 1430r/min at a flow rate of 10L/min was changed to a motor with a speed of 710r/min and equipped with a larger pump to obtain the same flow rate. The noise of the NSK bearing of the oil pump NSK bearing and the oil pump motor is significantly reduced, but the space occupied by the whole set of institutions has been expanded and the cost has also increased.
The noise of rolling NSK bearings is not very sensitive to the load, but it is sensitive to the speed. When conditions permit, the method of reducing the speed and increasing the torque achieves the same purpose, but reduces the noise.
(3) Method of using chemical additives
Adding some chemical additives to NSK bearing lubricants can reduce NSK bearing noise. For example, a factory in Tianjin produces a low-noise grease containing noise-reducing additives, which can reduce NSK bearing noise from the original 3.9~ 9.2dB, suitable for use in miniature or small NSK bearings.
How should NSK bearings be maintained and maintained?
In order to fully utilize NSK bearings and maintain their proper performance for a long time, regular maintenance (regular inspection) must be performed. Through proper periodic inspections, early detection of failures and prevention of accidents are important to improve productivity and economy.
For more information and purchase please visit: https://www.supplyforever.com
Analysis of the causes of burns on imported bearings
The so-called burn injury state of the imported bearings means that the raceway wheel, the rolling element and the cage of the imported bearing are heated rapidly during the rotation until discoloration, softening, welding and damage.
The main cause of burns on imported bearings is the poor lubrication of imported bearings, the possibility of using irregular lubricants, or too many lubricants, too few, are incorrect. For related information on the lubrication of imported bearings, please refer to the introduction of the two articles "The Misunderstanding of Lubricating Grease in the Process of Repairing FAG Bearings" and "Introduction to Lubrication Technology in Imported 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 and the 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 bearing lubricant, and the amount of the lubricant, and correct the bearing selection. Research is to match, bearing clearance and preload, and to improve the seal. Check the accuracy of the shaft and bearing housing. Of course, if you have an expert next to you, let him operate and learn the best!
It is recommended that when using imported bearings, it is necessary to pay attention to the installation, lubrication, clearance and other aspects to be as accurate as possible.
For more information and purchase please visit: https://www.supplyforever.com
Transmission one-axis rear bearing damage inspection and troubleshooting
A CA6440 light passenger car, after driving for 40,000 kilometers, continuously showed the damage of the first axle rear bearing (50306#) of the transmission. In the process of sweeping this fault, several times the dismantling of the transmission, no abnormalities were found; the torsion bar spring adjustment screw was measured, the height was 42mm, and the rule of the rule was met; check the position of the spline groove between the torsion bar spring and the fixed arms at both ends. - All the two levers were crashed and checked, and no problems were found. Only the rubber pad between the torsion bar spring adjustment screw and the rear fixed arm on the left side is damaged. After changing the rubber pad, the problem is removed. It has been driving more than 5,000 kilometers so far, and the bearing work is still normal.
The CA6440 light passenger car, the front suspension uses a vertical torsion bar spring independent suspension, connected to the frame and steering knuckle through the connecting rod. The torsion bar spring is connected to the lower control arm through the twisting arm, and the lower control arm is connected with the frame through the front beam to form the front support. The torsion bar spring is connected to the transmission support beam via a fixed arm and an adjusting screw, and the transmission support beam is connected with the frame to form a rear support. The force and moment in all directions are transmitted by the connecting rod system, and the torsion bar spring receives the changing torque. During the driving process, when the front wheel encounters the impact force in the direction direction, the front wheel and the steering knuckle are transmitted to the transmission support beam and the frame through the torsion bar spring; when the front wheel encounters the impact force in the vertical direction, the front suspension The frame is transformed by the torsion bar spring into a changing torque that is transmitted to the transmission support beam and the frame. The energy of various impact forces and moments on the front wheels is gradually absorbed by the tires, shock absorbers, steering knuckles, tie rod springs, transmission beams and frame parts to ensure the smoothness and safety of the car. In order to make the front wheels on both sides encounter the forces and moments in all directions, it can be effectively absorbed and consumed. When the torsion bar spring is installed, a certain pre-torque force should be added. This pre-torque is equivalent to a large spring that cooperates with the damper to provide vibration damping while also effectively absorbing the energy generated by forces and moments from all directions of the front wheels. In order to make the two spring torsion bars have the same pre-torque force, the device and adjustment of the torsion bar spring must be strictly operated in accordance with the technical specifications, so as to ensure that the two front wheels reach equilibrium during the transmission force and torque and energy absorption.
For more information and purchase please visit: https://www.supplyforever.com
Several methods for FAG imported bearing maintenance classification
Maintenance of FAG bearings includes repair and maintenance. For those FAG bearings that are not damaged, through maintenance, it can eliminate hidden dangers and ensure the normal operation and long service life of FAG bearings. When the FAG bearings are damaged, they can be repaired to eliminate defects and restore their function.
General FAG imported bearing repair classification has the following three types:
1. Regular maintenance: In order to ensure the normal operation of the main engine, according to the requirements of the main machine and the design theory and experience of FAG imported bearings, set a maintenance cycle and regular maintenance.
2. Fault repair: When FAG imported bearings fail, stop inspection and maintenance.
3. Early warning maintenance: Using advanced FAG imported bearing fault diagnosis technology, real-time monitoring of the use status of FAG imported bearings, forecasting and repairing before FAG imported bearings fail.
During the operation of FAG imported bearings, there must be sound, temperature and vibration. Therefore, for the maintenance of FAG bearings in operation, you can find out the abnormal changes of FAG bearings by listening, touching, observing and using FAG imported bearing fault diagnosis instruments. According to the changing status, it is judged whether the FAG bearings are in normal condition. Working status.
For more information and purchase please visit: https://www.supplyforever.com
How to lubricate NTN bearings
NTN bearing is one of the imported bearings. How to properly lubricate NTN bearings during normal operation is also an important part of NTN bearing maintenance and maintenance.
1. The oil bath of NTN bearing is smooth
Smooth oil bath is the most common smoothing method in NTN bearings, suitable for the smoothness of low and medium speed NTN bearings. The NTN bearing is partially immersed in the groove, the smooth oil is brought up by the rotating NTN 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. Smooth drop of NTN bearing
Smooth drip is suitable for NTN bearing parts that need to be supplied with smooth oil. The amount of oil drops is preferably every 3-8 seconds. Excessive oil quantity will cause NTN bearing temperature to increase.
3. NTN bearing's circulating oil is smooth
The oil is pumped to the NTN bearing component by an oil pump, filtered and cooled by the smooth oil after the NTN bearing. Because the circulating oil can take away a certain amount of heat and cool the NTN bearing, this method is used for NTN bearing components with higher speed.
4. Smooth spray of NTN bearings
The boring shrinking air is mixed with the smooth oil by the sprayer to cause oil mist. In the NTN bearing, the airflow can effectively cool the NTN bearing and avoid the intrusion of impurities. This method is suitable for the smoothness of high speed, low temperature NTN bearing components.
5. Smooth radiation of NTN bearings
The low pressure oil is injected into the NTN bearing through the nozzle by the oil pump, and the oil injected into the NTN bearing flows into the oil groove through the other end of the NTN bearing. When the NTN bearing rotates at a high speed, the rolling elements 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 NTN bearing in a single smooth manner, which must be smoothed by low-pressure radiation. The oil is sprayed into the NTN bearing and the position of the nozzle should be placed between the inner ring and the center of the cage.
For more information and purchase please visit: https://www.supplyforever.com
Teach you a few practical tips for fault diagnosis of rolling bearings
Rolling bearings are widely used in equipment. The condition of rolling bearings is directly related to the operating state of rotating equipment. Especially in large-scale continuous production enterprises, it is widely used in important parts of large-scale rotating equipment. Therefore, in actual production, the rolling bearing condition monitoring and Fault diagnosis is an important part of equipment maintenance and management. After long-term practice and exploration, we have accumulated some practical skills for the actual fault diagnosis of rolling bearings.
First, the method and key points of rolling bearing fault diagnosis
A practical method for condition monitoring and fault diagnosis of rolling bearings is vibration analysis.
In practice, you need to pay attention to the location and acquisition method of the measuring point. In order to accurately and accurately reflect the vibration state of the rolling bearing, it must be noted that the collected signal is accurate and true. Therefore, the measuring point should be arranged in the nearest place to the bearing. Generally, there is a rear fan cover at the free end of the motor, and the measuring point is selected in the fan cover fixing screw. Good monitoring results. In addition, it is necessary to pay attention to the multiple acquisition and analysis of the vibration signal, and comprehensively compare. To get an accurate conclusion.
Second, the characteristics of rolling bearings normal operation and practical diagnostic techniques
In the long-term production status monitoring, we found that the rolling bearing showed strong regularity during its use and the repeatability was very good. Normal high-quality bearings are relatively small in 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 motion, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency. There are very few spectrums above the power frequency, and the bearing status is very stable and enters a stable working period.
After continuing to run, the bearing vibration and noise begin to increase, and sometimes abnormal sounds occur, but the vibration increase changes slowly. At this time, the bearing kurtness value suddenly reaches a certain value. We believe that the bearing is an initial failure at this time.
For more information and purchase please visit: https://www.supplyforever.com
What aspects should be considered in the selection of rolling bearings?
There are many types of rolling bearings and a wide range of sizes. In order to select the most suitable bearing for the design purpose, it is necessary to integrate the mechanical conditions, the performance requirements of the bearing, the specifications of the bearing, and the market and economy. analysis.
Since the bearing diameter is generally determined first, then the bearing is selected first, and the bearing type is preliminarily determined based on the bearing inner diameter and considering the bearing installation space and configuration mode. Secondly, the analysis and comparison of the "mechanical required bearing life" and "press Bearing life calculated by bearing load "determines the size of the bearing; finally, it is necessary to determine the internal structure of the bearing such as accuracy level, internal clearance, cage, lubricant, etc.
The general steps for selection are:
1. Determination of bearing type and configuration. (Reference factors are: bearing installation space; bearing load size, direction and nature; speed; rotation accuracy; noise and friction torque; rigidity; relative inclination of inner and outer rings; installation and disassembly; bearing configuration; Sex and economy).
2. Determination of bearing size. (mechanical required bearing life; equivalent dynamic load; equivalent static load; speed; main bearing size; basic dynamic load rating; basic static load rating; allowable axial load).
3. Determination of the accuracy level. (rotation accuracy; noise and friction torque; speed; bearing accuracy).
4, with the internal clearance. (The size and nature of the load; the temperature at the time of operation; the material, size and precision of the shaft and the outer casing; the fit; the temperature difference between the inner and outer rings; the rotational speed; the preload; the bearing accuracy; the internal clearance of the bearing).
For more information and purchase please visit: https://www.supplyforever.com
Micromech bearings can be used with shafts up to 12 mm in diameter
Micromech offers Spyraflo seated bearings for shafts smaller than 12 mm in medical, pharmaceutical, scientific and general purpose precision equipment.
The PB series is said to be the first miniature ball bearing in the industry for small shafts.
These high-efficiency, cost-saving miniature ball bearings designed for a wide range of instruments are designed for precision installations, eliminating the need for design, production and installation.
At the beginning, this product was mainly of non-aligned type, as the product is mainly used in more sophisticated fields.
Because these miniature double-sealed ball bearings require lifetime lubrication, they can only be matched to shafts up to 4 to 10 mm in diameter.
This kind of miniature ball bearing has aluminum bearing housing body, stainless steel material and double sealing characteristics, which makes the product have certain corrosion resistance, which is the best choice in food and cleaning field.
For more information and purchase please visit: https://www.supplyforever.com
Detailed explanation: Simple cleaning and refueling method for textile sealed bearings
New cotton spinning equipment uses a large number of sealed bearings due to dust, heat and high speed requirements. After a certain period of operation of these bearings, the bearings are dry and damaged due to lack of oil inside. For example, the imported air-sea spinning machine has a large number of sealed bearings, and the material is good. However, after several years of use, the grease can not be cleaned and replenished, which causes a large number of sealed bearings to be scrapped, which increases equipment failure and unnecessary expenses.
Two simple and effective cleaning and refueling methods are introduced. The first type of sleeve cleaning and refueling method is suitable for sealed bearings with gaps at both ends of the bearing housing. The method is to first soak the bearing in the kerosene for 1 h to 2 h, and then make a special sleeve according to the outer diameter of the bearing, which can both clean and refuel. The inner diameter of the sleeve is slightly larger than the outer diameter of the bearing from 0.05 mm to 0.08 mm, which is slightly shallower than the bearing. Cleaning and refueling step: add appropriate amount of kerosene into the sleeve, press the bearing into the hand, use the gap of the bearing itself, squeeze the kerosene out, repeat 1 or 2 times; clean and drip before adding the required grease to the sleeve The bearing is placed in the sleeve and gently pressed with a pressure gauge. The bearing oil is flexibly controlled according to the demand. The second type is suitable for special fully enclosed bearings with a gap at one end and a set screw hole. Use the positioning screw hole to communicate with the bearing clearance, first soak the bearing in kerosene for 1 h to 2 h, inhale the kerosene with a special nozzle and oil gun, repeatedly drive the bearing 2 to 3 times, and then use the oil gun to lubricate the required lubrication. Add the fat to it.
For more information and purchase please visit: https://www.supplyforever.com
How to use rolling bearings
Through a large number of rolling bearing failure analysis studies, the bearing short-life or premature loss of precision, due to material defects or improper manufacturing, but to a considerable extent is not strictly in accordance with the requirements of bearing installation, maintenance, or Abnormal bearing damage caused by improper bearing selection or actual load exceeding the rated load of the bearing itself
For example, fatigue spalling of bearing parts is largely due to impurities in the lubricating oil. It can be seen that in order to achieve a longer life and accuracy retention of rolling bearings, in addition to requiring bearing manufacturers to improve product quality, bearing users must also use bearings with scientific methods and procedures. Otherwise, even better bearings will be inferior. Aborted under random use conditions.
The rolling bearing is a kind of precision mechanical supporting component. The bearing user deeply hopes that the bearing mounted on the main machine can not damage and maintain its dynamic performance within the predetermined service period, but the objective fact is sometimes not satisfactory, sudden bearing failure accident. Will cause significant losses to users.
For more information and purchase please visit: https://www.supplyforever.com
What aspects should be considered when choosing a bearing clearance?
When choosing a bearing clearance, the following aspects should be considered:
1, the working conditions of the bearing, such as load, temperature, speed, etc.;
2. Requirements for bearing performance (rotational accuracy, friction torque, vibration, noise);
3. When the bearing and the shaft and the housing hole are in an interference fit, the bearing clearance is reduced;
4. When the bearing is working, the temperature difference of the inner jacket ring causes the bearing clearance to decrease;
5. The bearing clearance is reduced or increased due to the different expansion coefficients of the shaft and the outer casing material.
6, according to the experience of use, the most suitable working clearance of the ball bearing is close to zero; roller bearings should maintain a small amount of working clearance. In components requiring good bearing rigidity, the bearings allow a certain amount of preload. It is specifically pointed out here that the so-called working clearance refers to the clearance of the bearing under actual operating conditions. There is also a kind of play called the original play, which refers to the play before the bearing is not installed. The original clearance is larger than the installation clearance. Our choice of clearance is mainly to choose the right working clearance. Valve inlet pump
For more information and purchase please visit: https://www.supplyforever.com
Y-bearing with eccentric locking ring
Y-bearing (Y bearing) with eccentric locking ring:
There is an eccentric extension, and the Y-bearing with eccentric locking ring is mainly suitable for applications where the direction of rotation is inconvenient. One side of the inner ring of the bearing. Fitted with the locking ring. Rotate the locking ring on the extension of the inner ring in the direction of rotation, ie the collar and bearing are locked to the shaft. Use a flat (fixed) screw to tighten the collar further to the shaft.
SKF offers two standard ranges:
The inner ring protrudes on one side, one is the Y-bearing of the YET2 series. Sturdy Superagris seals are fitted on both sides. The eccentric locking ring is covered with a galvanized layer. The specification outer ring has two lubrication holes.
Make the bearing run more smoothly. These bearings are equipped with rugged specifications for Superagris seals, and the inner ring of the YEL2 series Y-bearings extends on both sides. This helps to reduce the level at which the inner ring tilts toward the shaft. And one of the following two oil retaining rings:
The model suffix is 2F oil slinger made of ordinary steel sheet.
Steel slinger with rubber sealing lip (multiple seal) model suffix 2RF
The outer ring is standard with two lubrication holes. SKF also offers bearings without oil holes on request. These bearings are indicated by the suffix W.
This type of SKF bearing is included
Suitable for bearings with a diameter range of 15-60mm and metric shafts.
Applicable diameters range from 1/2-215/16 inches. Bearings for the British shaft.
For more information and purchase please visit: https://www.supplyforever.com
Ferrography analysis method: online monitoring technology for rolling bearings
Online monitoring technology for rolling bearings: Ferrography analysis (bearing monitoring):
Analytical iron spectrometer, direct reading iron spectrometer and online iron spectrometer. Ferrographs are usually divided into these three categories.
The high-gradient magnetic field is used to deposit the solid foreign matter contained in the oil sample flowing through the magnetic field on the glass piece to observe the shape and size of the foreign matter particles. The iron spectrum analysis technique is particularly suitable for identifying and predicting rolling fatigue. a way. A part of the lubricating oil of the rolling bearing is taken as an oil sample. Color and material, so that the type of wear can be clearly identified, the operating state of the machine is predicted, and hidden dangers are discovered in time.
However, it also has excellent identification ability for non-ferrous metals such as copper, sand, organic matter and sealing debris. In principle, the ferrography technology is aimed at identifying strong magnets such as steel.
It is certain that the bearing has begun to appear fatigue microcracks. When the length-to-thickness ratio of the oil sample is 10 1 fatigue-peeling particles, when the steel-like spherical particles having a diameter of 15 μm appear in the oil sample. When the length is greater than 10 μm, abnormal fatigue wear in the bearing has begun, and when the length is greater than 100 μm, the bearing has failed.
The length is between 20 50 μm and the third type of fatigue debris is a length to thickness ratio of 30 1 fatigue sheets. Sheets often have holes. When fatigue begins to appear, the number of such flakes increases significantly, which can be used together with spherical particles as a sign of fatigue.
Analytical iron spectrometer, direct reading iron spectrometer and online iron spectrometer. Ferrographs are usually divided into these three categories.
The high-gradient magnetic field is used to deposit the solid foreign matter contained in the oil sample flowing through the magnetic field on the glass piece to observe the shape and size of the foreign matter particles. The iron spectrum analysis technique is particularly suitable for identifying and predicting rolling fatigue. a way. A part of the lubricating oil of the rolling bearing is taken as an oil sample. Color and material, so that the type of wear can be clearly identified, the operating state of the machine is predicted, and hidden dangers are discovered in time.
However, it also has excellent identification ability for non-ferrous metals such as copper, sand, organic matter and sealing debris. In principle, the ferrography technology is aimed at identifying strong magnets such as steel.
It is certain that the bearing has begun to appear fatigue microcracks. When the length-to-thickness ratio of the oil sample is 10 1 fatigue-peeling particles, when the steel-like spherical particles having a diameter of 15 μm appear in the oil sample. When the length is greater than 10 μm, abnormal fatigue wear in the bearing has begun, and when the length is greater than 100 μm, the bearing has failed.
The length is between 20 50 μm and the third type of fatigue debris is a length to thickness ratio of 30 1 fatigue sheets. Sheets often have holes. When fatigue begins to appear, the number of such flakes increases significantly, which can be used together with spherical particles as a sign of fatigue.
For more information and purchase please visit: https://www.supplyforever.com
How to lubricate and maintain IKO bearing repair method
Core Tips: 1. IKO Bearing Cleaning When dismantling IKO bearing inspection, first record the bearing appearance, confirm the residual amount of the moisturizer, and then wash the bearing after sampling and checking the moisturizer. As cleaning
1, IKO bearing cleaning
When removing the IKO bearing for inspection, first record the appearance of the bearing, confirm the residual amount of the moisturizer, and then wash the bearing after sampling and checking the moisturizer. As a cleaning agent, gasoline and kerosene are commonly used.
The cleaning of the removed bearing is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first, so that the IKO bearing does not directly contact the container. During rough cleaning, if the bearing is rotated with dirt, it will damage the IKO bearing rolling surface and should be noted. In the rough cleaning oil, use a brush to remove the moisturizing grease and sticks. After it is almost clean, transfer it to a fine wash.
Fine washing is to carefully clean the IKO bearing while rotating it in the cleaning oil. In addition, the cleaning oil should always be kept clean.
2. Overhaul of IKO bearings
In order to judge whether the removed IKO bearing can be reused, check the bearing after cleaning, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of IKO bearing clearance and whether there is any Damage and abnormality with reduced dimensional 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.
1, oil bath moisturizing
Oil bath moisturizing is the most common moisturizing method in IKO bearings, suitable for moisturizing low and medium speed bearings. Part of the bearing is immersed in the groove, the moisturizing oil is brought up by the rotating bearing parts, and then flows back to the oil groove. The oil level should be slightly lower than the center of the lowest rolling element.
2, dripping oil moisturizing
Drip oil moisturizing is suitable for bearing parts that need to supply moisturizing oil quantitatively. The amount of dripping oil is generally one drop per 3-8 seconds. Excessive oil quantity will cause the bearing temperature to increase.
3, circulating oil moisturizing
The filtered oil is transferred to the IKO bearing component by an oil pump, filtered and cooled by the moisturizing oil after the bearing. Since the circulating oil can take a certain amount of heat to cool the bearing, this method is suitable for bearing parts with higher rotational speed.
4, spray moisturizing
The dry compressed air is mixed with the moisturizing oil through a sprayer to form an oil mist. The IKO bearing is sprayed, and the air flow can effectively cool the bearing and prevent the intrusion of impurities. This method is suitable for the moisturization of high-speed, high-temperature bearing components.
5, spray moisturizing
The high-pressure oil is injected into the bearing through the nozzle by the oil pump, and the oil injected into the IKO bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at a high speed, the rolling elements and the cage also form a flow of air around the air at a relatively high rotational speed. It is difficult to send the moisturizing oil to the IKO bearing by the general moisturizing method. At this time, the moisturizing oil must be sprayed by high pressure. Spray into the bearing and the position of the nozzle should be between the inner ring and the center of the cage!
1, IKO bearing cleaning
When removing the IKO bearing for inspection, first record the appearance of the bearing, confirm the residual amount of the moisturizer, and then wash the bearing after sampling and checking the moisturizer. As a cleaning agent, gasoline and kerosene are commonly used.
The cleaning of the removed bearing is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first, so that the IKO bearing does not directly contact the container. During rough cleaning, if the bearing is rotated with dirt, it will damage the IKO bearing rolling surface and should be noted. In the rough cleaning oil, use a brush to remove the moisturizing grease and sticks. After it is almost clean, transfer it to a fine wash.
Fine washing is to carefully clean the IKO bearing while rotating it in the cleaning oil. In addition, the cleaning oil should always be kept clean.
2. Overhaul of IKO bearings
In order to judge whether the removed IKO bearing can be reused, check the bearing after cleaning, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of IKO bearing clearance and whether there is any Damage and abnormality with reduced dimensional 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.
1, oil bath moisturizing
Oil bath moisturizing is the most common moisturizing method in IKO bearings, suitable for moisturizing low and medium speed bearings. Part of the bearing is immersed in the groove, the moisturizing oil is brought up by the rotating bearing parts, and then flows back to the oil groove. The oil level should be slightly lower than the center of the lowest rolling element.
2, dripping oil moisturizing
Drip oil moisturizing is suitable for bearing parts that need to supply moisturizing oil quantitatively. The amount of dripping oil is generally one drop per 3-8 seconds. Excessive oil quantity will cause the bearing temperature to increase.
3, circulating oil moisturizing
The filtered oil is transferred to the IKO bearing component by an oil pump, filtered and cooled by the moisturizing oil after the bearing. Since the circulating oil can take a certain amount of heat to cool the bearing, this method is suitable for bearing parts with higher rotational speed.
4, spray moisturizing
The dry compressed air is mixed with the moisturizing oil through a sprayer to form an oil mist. The IKO bearing is sprayed, and the air flow can effectively cool the bearing and prevent the intrusion of impurities. This method is suitable for the moisturization of high-speed, high-temperature bearing components.
5, spray moisturizing
The high-pressure oil is injected into the bearing through the nozzle by the oil pump, and the oil injected into the IKO bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at a high speed, the rolling elements and the cage also form a flow of air around the air at a relatively high rotational speed. It is difficult to send the moisturizing oil to the IKO bearing by the general moisturizing method. At this time, the moisturizing oil must be sprayed by high pressure. Spray into the bearing and the position of the nozzle should be between the inner ring and the center of the cage!
For more information and purchase please visit: https://www.supplyforever.com
Method for preventing burning of diesel engine bearings
Core Tip: Methods to prevent diesel bearing burnout: Early damage to plain bearings is much more common than bearing burnout, so it is important to prevent early damage to the plain bearings. Proper maintenance of sliding bearings is reduced
Method for preventing diesel bearing bearing burnout:
Early damage to sliding bearings is much more common than bearing burnout, so it is important to prevent early damage to the sliding bearings. Proper maintenance of the sliding bearing is an effective way to reduce the early damage of the bearing and a reliable guarantee to extend the life of the bearing. Therefore, in the routine maintenance and repair of the engine, attention must be paid to the appearance of the alloy surface, the back end, the end and the edge of the bearing. If there is an abnormality or a sign of excessive wear, it is necessary to carefully identify the cause and take corresponding action. The measures to improve the working conditions of the bearing, pay attention to the prevention of early damage to the sliding bearing.
1. Strict measurement of the coaxiality and roundness of the main bearing bore of the diesel engine body. For the measurement of the coaxiality of the main bearing bore of the machine body, the coaxiality of the diesel engine body must be measured accurately, and the runout of the crankshaft is measured, so that the thickness of the bearing bush is selected, so that the oil lubrication gap is consistent in each axial position. . Where the diesel engine has been crushed, flying, etc., the coaxiality of the main bearing bore of the body must be checked before assembly. The total length of the ductile iron crankshaft is not more than 0.14mm, the total length of the steel crankshaft is not more than 0.12mm, and the body is bored. The roundness and cylindricity are also required. If it exceeds the limit, it is disabled. If it is within the limit, the grinding method is adopted (that is, the appropriate amount of red powder is applied to the bearing bush, and the crankshaft is loaded and then rotated, and then the bearing cap is removed to check the bearing bush, and the hard spot is convex. After the scraping process is performed, the amount of change in size is measured to ensure the reliability of use. Valve inlet pump industrial washing machine
2. Improve the maintenance and assembly quality of the bearings and strictly control the passing rate of the connecting rods. Improve the quality of the hinge of the bearing, ensure that the back of the bearing is smooth and spotless, and the positioning bump is intact;
3, its own elastic opening amount is 0.5 ~ 1.5mm, which can ensure that the bearing bush fits tightly with the bearing housing hole by its own elastic force after assembly;
4. It is required to measure the parallelism and distortion of the new and old connecting rods, and it is forbidden to get on the train for unqualified connecting rods;
Method for preventing diesel bearing bearing burnout:
Early damage to sliding bearings is much more common than bearing burnout, so it is important to prevent early damage to the sliding bearings. Proper maintenance of the sliding bearing is an effective way to reduce the early damage of the bearing and a reliable guarantee to extend the life of the bearing. Therefore, in the routine maintenance and repair of the engine, attention must be paid to the appearance of the alloy surface, the back end, the end and the edge of the bearing. If there is an abnormality or a sign of excessive wear, it is necessary to carefully identify the cause and take corresponding action. The measures to improve the working conditions of the bearing, pay attention to the prevention of early damage to the sliding bearing.
1. Strict measurement of the coaxiality and roundness of the main bearing bore of the diesel engine body. For the measurement of the coaxiality of the main bearing bore of the machine body, the coaxiality of the diesel engine body must be measured accurately, and the runout of the crankshaft is measured, so that the thickness of the bearing bush is selected, so that the oil lubrication gap is consistent in each axial position. . Where the diesel engine has been crushed, flying, etc., the coaxiality of the main bearing bore of the body must be checked before assembly. The total length of the ductile iron crankshaft is not more than 0.14mm, the total length of the steel crankshaft is not more than 0.12mm, and the body is bored. The roundness and cylindricity are also required. If it exceeds the limit, it is disabled. If it is within the limit, the grinding method is adopted (that is, the appropriate amount of red powder is applied to the bearing bush, and the crankshaft is loaded and then rotated, and then the bearing cap is removed to check the bearing bush, and the hard spot is convex. After the scraping process is performed, the amount of change in size is measured to ensure the reliability of use. Valve inlet pump industrial washing machine
2. Improve the maintenance and assembly quality of the bearings and strictly control the passing rate of the connecting rods. Improve the quality of the hinge of the bearing, ensure that the back of the bearing is smooth and spotless, and the positioning bump is intact;
3, its own elastic opening amount is 0.5 ~ 1.5mm, which can ensure that the bearing bush fits tightly with the bearing housing hole by its own elastic force after assembly;
4. It is required to measure the parallelism and distortion of the new and old connecting rods, and it is forbidden to get on the train for unqualified connecting rods;
For more information and purchase please visit: https://www.supplyforever.com
订阅：
博文 (Atom)