FAG bearing card injury analysis

FAG bearing card injury analysis:
Damage state: The so-called jam is a surface damage caused by a combination of minute burns generated on the sliding surface. The slide surface, the linear flaw in the circumferential direction of the rolling surface. Cycloidal flaws on the end of the roller. A jam on the collar face near the end face of the roller.
Cause: Excessive load, excessive preload.
       Poor lubrication.
       Foreign body bites like.
       The inner ring, the outer ring is inclined, the shaft, and the bearing box have poor precision.
Action: Check the size of the load.
       Preload should be appropriate.
       Improve lubricants and lubrication methods.
       Check the accuracy of the shaft and bearing housing.

https://www.supplyforever.com/

What is a stamped bearing

An external force is applied to a plate, a strip, a pipe, a profile, and the like by a punch and a die to cause plastic deformation or separation, thereby obtaining a forming process of a workpiece of a desired shape and size, and the obtained workpiece is a stamped part.
The stamping bearing is a forming method for applying a force to a plate, a strip, a pipe, a profile, and the like by a press and a mold to cause plastic deformation or separation to obtain a workpiece of a desired shape and size (a stamped bearing stamping). Stamping and forging are the same plastic processing (or pressure processing), collectively called forging. The stamped blanks are mainly hot rolled and cold rolled steel sheets and strips.
Of the world's steel, 60 to 70% are sheets, most of which are stamped into finished products. The body, chassis, fuel tank, radiator piece of the automobile, the steam drum of the boiler, the casing of the container, the iron core silicon steel piece of the electric motor and the electric appliance are all stamped and processed. There are also a large number of stamping parts in instruments, household appliances, bicycles, office machinery, living utensils and other products.
Compared with castings and forgings, stamping bearings are thin, uniform, light and strong. Stamping can produce workpieces with ribs, ribs, undulations or flanging that are difficult to manufacture by other methods to increase their rigidity. Thanks to the use of precision molds, the precision of the workpiece can reach micron level, and the repeatability is high and the specifications are the same. It is possible to punch out the holes and the bosses.
Stamped bearings are generally no longer machined or require only a small amount of machining. The accuracy and surface condition of hot stampings are lower than that of cold stampings, but they are still superior to castings and forgings, and the amount of cutting is small.
Stamping is an efficient production method. It adopts composite molds, especially multi-station progressive molds. It can complete multiple stamping processes on one press, and realize the whole process of unwinding, leveling and punching to forming and finishing. Automatic production. High production efficiency, good working conditions, low production costs, and generally can produce hundreds of pieces per minute.
Stamping is mainly classified according to the process, and can be divided into two major categories: separation process and forming process. The separation process is also referred to as blanking, and its purpose is to separate the stamped parts from the sheet along a certain contour line while ensuring the quality requirements of the separated sections. The purpose of the forming process is to plastically deform the sheet without breaking the blank to produce a workpiece of the desired shape and size. In actual production, it is often the case that multiple processes are integrated into one workpiece. Blanking, bending, shearing, drawing, bulging, spinning, and correction are several major stamping processes.
The surface and intrinsic properties of stamping sheets have a great influence on the quality of stamped products. The thickness of stamping materials is required to be precise and uniform. The surface is smooth, no spots, no flaws, no scratches, no surface cracks, etc.; yield strength is uniform, no obvious Directionality; high uniform elongation; low yield ratio; low work hardenability.

https://www.supplyforever.com/

How to clean and judge whether to replace SKF cylindrical roller bearing

When disassembling the lower bearing inspection, first record the appearance of the SKF cylindrical roller 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 bearing 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. In rough cleaning, if the bearing is rotated with dirt, it will damage the moving surface of the SKF cylindrical roller bearing, so you should pay attention to it. 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.

2. Inspection and determination of SKF cylindrical roller bearings

In order to determine whether the removed SKF cylindrical roller bearing can be reused, check the SKF cylindrical roller bearing after cleaning. Carefully check the raceway surface, the dynamic spring surface, the state of the mating surface, the wear of the cage, and the bearing clearance. The increase and the presence or absence of damage and abnormality regarding the decrease in 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.

Separate SKF cylindrical roller bearings such as tapered roller bearings can be inspected separately for the raceway surface of the moving body and the outer ring.

Because large bearings cannot be rotated by hand, pay attention to checking the appearance of moving bodies, raceways, cages, ribs, etc. The higher the importance of bearings, the more careful inspection is required.

The determination of whether it can be reused is determined by considering the damage degree, mechanical function, importance, operation premise of the German SKF cylindrical roller bearing, and the period until the next inspection. However, if there are the following defects, they can no longer be used, and new bearings must be replaced:

(a) cracks or gaps in any of the inner ring, the outer ring, the moving body and the cage;

(b) There is a break in any of the ferrule and the moving body;

(c) obvious jamming on the raceway surface, ribs and moving body;

(d) The cage is significantly worn or the rivet is significantly slack;

(e) There is rust and injury on the raceway surface and the moving body;

(f) There are severe indentations and marks on the raceway surface and the moving body;

(g) There is significant creep in the inner diameter surface of the inner ring or the outer diameter surface of the outer ring;

(h) significant discoloration due to heat;

(i) SKF cylindrical roller bearings sealed with grease, and the seal or dust cover is damaged.

For more information and purchase please visit: https://www.supplyforever.com

Standard method and lubrication maintenance for installing NSK rolling bearings

Since the rolling bearings are rust-proofed and packaged, do not open the package until installation.

In addition, the anti-rust oil coated on the bearing has good lubricity. For general-purpose NSK bearings or grease-filled bearings, it can be used without cleaning. However, for instrument bearings or bearings for high-speed rotation, the cleaning oil should be washed with a clean cleaning oil. The bearing is prone to rust and cannot be placed for a long time.

Clean the bearing and the casing to confirm the burrs left by scratches or machining. There must be no abrasive (SiC, Al2O3, etc.) sand or chips in the outer casing.

Secondly, check whether the size, shape and processing quality of the shaft and the casing are in accordance with the drawings.

The method of installing the rolling bearing depends on the fit, condition and structure of the NSK bearing. Generally, since the shaft is mostly rotated, the inner ring needs an interference fit. Cylindrical bore bearings, press with multiple presses, or use hot charging methods. For taper holes, mount directly on the taper shaft or with a sleeve.

When installed in the outer casing, the general clearance fits a lot, and the outer ring has an interference amount, which is usually pressed by a press or a cold shrink fit method after cooling. When dry ice is used as the coolant and the shrinkage is installed, the moisture in the air will condense on the surface of the bearing. Therefore, appropriate rust prevention measures are required.

Mounting bearing: Whether the rolling bearing is installed accurately, affecting accuracy, life and function. Therefore, the bearing installation plan and the disassembly part are enriched. I hope I can install it according to my homework. The names of the homework scales are as follows:

(1) Clearing and bearing related components;

(2) Check the size and packing components related to the case;

(3) installation;

(4) Checking after bearing installation;

(5) A smoothing agent supplied.

For more information and purchase please visit: https://www.supplyforever.com

Analysis of Abnormal Phenomenon Caused by FAG Bearings

One: FAG bearing grease rheology:

1. When the grease is not subjected to external force, it can maintain a certain shape like a solid, that is, it will not automatically lose when it is at rest.

2. In the case of extremely high shear stress (high shear rate), the grease flows like a Newtonian fluid, and the viscosity can be kept constant without changing with the shear rate.

3. When subjected to weak external force, elastic deformation occurs; after removing the external force, it can return to its original position and shape, exhibiting the elastic properties of the solid.

4. When the applied external force is large enough, the grease deforms and flows, and thus can no longer automatically return to the original position and shape, so the starting torque of the grease on the mechanically moving part is larger than that of the liquid lubricating oil.

Two: FAG bearing grease defects:

1. Grease is semi-solid and does not flow at normal temperature, so it is difficult to add grease or change grease on friction parts. FAG bearing cleaning is not very convenient.

2. The stirring resistance is large, so the heat generation is large and the cooling effect is poor. However, it should be noted here that this has a close relationship with the lubrication method. If the lubricating oil is lubricated with a fully immersed (or semi-immersed) oil bath, the grease will consume less power than the oil. For example, the British Journal of Friction and Lubrication reported in 1973, 6th issue: With a rolling FAG bearing with a diameter of 100, the speed is 1500r/min, and it is lubricated with grease. There are many examples of energy consumption in China, such as the refractory plant of Chongqing Iron and Steel Company. The motor power of the refractory tunnel kiln induced draft fan is grease compared to the N68 lubricant. The FAG bearing temperature is 4~6 °C lower.

3. The base oil is the carrier of the additive, and the additive does not function if the base oil fails.

4. Due to the mechanical action, the lubricating base filled in the FAG bearing configuration will gradually lose its lubricating properties. Therefore, the grease needs to be continuously replenished and updated. The interval between lubricant replenishment varies depending on the formation, size, and rotational speed of the FAG bearing, and the approximate interval of replenishment of the grease is required depending on the operation time.

For more information and purchase please visit: https://www.supplyforever.com

Process characteristics for judging the vibration of imported bearings and the temperature of imported bearings

First, the vibration of imported bearings

The vibration of the imported bearing is very sensitive to the damage of the imported bearing. For example, peeling, indentation, rust, crack, wear, etc. will be reflected in the vibration measurement of the imported bearing. Therefore, by using a special bearing vibration measuring device (frequency analyzer, etc.) The magnitude of the vibration is measured, and the specific situation of the abnormality cannot be inferred by the frequency division. The measured values ​​vary depending on the conditions of use of the bearing or the mounting position of the sensor. Therefore, it is necessary to analyze and compare the measured values ​​of each machine in advance to determine the judgment standard.

Second, the temperature of the imported bearings

The temperature of the imported bearing is generally estimated by the temperature outside the bearing. If the oil hole can directly measure the temperature of the outer ring of the imported bearing, it is more suitable.

Usually, the temperature of the imported bearing rises slowly as the bearing starts to run, and reaches a steady state after 1-2 hours. The normal temperature of the imported bearings varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the temperature of the imported bearings will rise sharply, and abnormal high temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions.

The thermal sensor can be used to monitor the working temperature of the imported bearing at any time, and automatically alarm or stop the occurrence of the burning shaft accident when the temperature exceeds the specified value.

The use of high temperatures often indicates that the bearing is in an abnormal condition. High temperatures are also detrimental to the lubricants of imported bearings. Sometimes 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 bearing life. Causes of high temperature imported bearings include: insufficient lubrication or excessive lubrication, lubricants. Containing impurities, excessive load, loss of imported bearings, insufficient clearance, and high friction caused by oil seals.

Therefore, it is necessary to continuously monitor the temperature of the imported bearings, whether it is measuring the bearing itself or other important parts. If the operating conditions are the same, any temperature change can indicate that a fault has occurred.

The periodic measurement of the temperature of the imported bearing can be carried out by means of a thermometer, such as a digital thermometer, which can accurately measure the temperature of the imported bearing and display it in °C or Fahrenheit.

For more information and purchase please visit: https://www.supplyforever.com

Analysis of Rolling Noise Analysis of IKO Bearings

The rolling sound is caused by the rolling of the rolling elements in the raceway when the IKO bearing rotates to excite a smooth and continuous noise, which only attracts attention when its sound pressure level or tone is extremely large. In fact, the sound energy excited by the raceway sound is limited. For example, under normal conditions, the quality of the 6203IKO bearing raceway is 25 to 27 dB. This type of noise is the most typical of single row deep groove IKO bearings that can withstand radial loads. It has the following characteristics:

a. Noise and vibration are random;

b. The vibration frequency is above 1 kHz;

c. Regardless of the change in the rotational speed, the main frequency of the noise is almost constant and the sound pressure level increases as the rotational speed increases;

d. When the radial clearance increases, the sound pressure level increases sharply;

e.IKO bearing housing rigidity increases, the lower the total sound pressure level, even if the speed increases, its total sound pressure level does not increase much;

f. The higher the viscosity of the lubricant, the lower the sound pressure level, but for grease lubrication, the viscosity and shape of the soap fiber can affect the noise value.

The rolling sound is caused by the natural vibration of the ferrule after the load. Due to the elastic contact of the ferrule and the rolling body, a nonlinear vibration system is formed. When the lubrication or machining accuracy is not high, the natural vibration associated with this elastic characteristic is excited, and when it is transmitted to the air, it becomes noise. It is well known that even if IKO bearing parts are processed using the most advanced manufacturing techniques in the world, there will always be small geometric errors in the working surface, which will cause small fluctuations between the raceway and the rolling elements to excite the natural vibration of the vibration system.

Although the raceway noise of IKO bearingsis unavoidable, in the high-precision machining of the working surface of the parts, the IKO bearing is correctly selected and the IKO bearing is accurately used to reduce noise and vibration.

For more information and purchase please visit: https://www.supplyforever.com

How to solve the problem of INA bearing essential noise

Often affecting the noise of the entire machine, reducing the sound of the raceway can reduce the noise of the entire machine.

Impact sound of rolling element and its control method When the larger type of ball INA bearing or cylindrical roller INA bearing runs at low speed under pure radial load, the rolling element in the non-load area will impact due to the small centrifugal force of the rolling element. Noise is generated by the cage or raceway. But as the speed increases, the sound will disappear. The control methods for the rolling body impact sound are: appropriately reducing the radial clearance, and using an INA bearing with a reasonable structure and a flexible material.

The rolling noise of INA bearing and its control method The rolling sound is the harsh metal friction sound of cylindrical roller INA bearing which can occur in all occasions. Most of them occur in grease-lubricated larger type INA bearing, and the performance in base oil Deteriorated grease is more likely to occur and hardly occurs when oil is lubricated.

In addition, it is more likely to occur in winter. When subjected to pure radial load, it is easy to occur in the case of large radial clearance, and it is easy to occur in a certain speed range depending on the size of the INA bearing model. Continuous occurrences will occur intermittently. Special processing methods for the outer ring raceway can prevent the occurrence of rolling noise. If necessary, use this INA bearing, or reduce the radial clearance of the INA bearing, use the excellent grease and improve the matching with the INA bearing. The rigidity of the piece. Can't add more.

For more information and purchase please visit: https://www.supplyforever.com

Talking about: Bearing clearance dynamic measuring instrument

Radial/axial clearance of rolling bearings is one of the important quality indicators of bearings and an important factor affecting the vibration, noise and life of bearings.

Among them, X093J bearing radial clearance instrument won the second prize of scientific and technological progress of the Ministry of Machinery Industry.

The instrument is compact and reasonable in structure, high in spindle rotation precision, stable and reliable in measurement; high-precision inductive sensor-single-chip system, automatic data acquisition, automatic statistical calculation, digital and meter display, and high measurement accuracy.

X09 series bearing radial / axial clearance measuring instrument, is an international standard no-load dynamic high-precision measuring instrument, the measured value is the average value of the finished bearing clearance, and is the standard instrument for measuring the clearance of the finished bearing in the bearing industry.

(Note: The configuration of the instrument is generally mechanical and electrical box configuration, the company can develop special measurement software and measurement circuit according to user needs, change the electrical box configuration to computer configuration)

For more information and purchase please visit: https://www.supplyforever.com

Solution to the failure of the jaw crusher bearing

The -type crusher, also known as the PEX jaw crusher, is an upgraded product of the PE jaw crusher. The jaw crusher retains the advantages of PE crusher with large crushing ratio, uniform product size, simple structure, reliable performance and convenient maintenance. It is suitable for coarse and medium-sized crushing and can crush various ores with compressive strength of 2000kg/cm2. , rock materials. The jaw crusher is one of the best equipment for rough crushing in sand and gravel production lines and mining and mineral processing. Long-term high-load operation of the jaw crusher can cause failures in bearings, linings, hammers, and motors. The following is a brief introduction to the causes and countermeasures of excessive bearing temperature during the use of the jaw crusher.

The jaw crusher bearing oil is cut off or the oil is injected too much; the oil hole is blocked and the oil is not added; the flywheel wheel counterweight position is offset, the frame is beating; the bushing is axially tilted; the bearing wears or remains Damage to the frame, etc., may cause the bearing temperature of the jaw crusher to be too high. In response to the above problems, Zhengzhou Xinhai Machinery Liu engineers summarized the corresponding countermeasures: according to the specifications, quantitatively refueling on time; cleaning oil holes and oil sump plugs; adjusting the position of the flywheel counterweight; removing the bearing cap on the frame , tighten the bushing and remove the flywheel or sheave, replace the new adapter bushing; replace the bearing; replace the end cap and the sealing sleeve, or loosen the upper bearing cap of the heating end of the frame bearing housing, with the fuse and The insert cover is pressed into the bearing housing groove, and the bearing cap is fixed to eliminate the rotation of the insert cover. Users of the jaw crusher need to regularly check and repair the equipment to ensure the stable operation of the equipment.

For more information and purchase please visit: https://www.supplyforever.com

Reasons and maintenance methods for oil leakage of IKO bearing oil seal

The oil seal is an important part of agricultural machinery and various types of mechanical equipment. The feeler gauge is inserted between the two rows of rollers on the IKO bearing and the outer circle and is widely used around the IKO bearing center. Its performance and quality directly affect the reliability of the use of agricultural machinery and various mechanical equipment. Some oil seals have a long life span of one year, a few months or even three or five days, and oil leaks due to poor sealing. This situation has seriously affected the working efficiency of agricultural machinery and various mechanical equipment, which not only increases fuel consumption and production costs, but also pollutes the environment.

First, the working principle of the oil seal 1. In the free state, the inner diameter of the oil seal lip is smaller than the shaft diameter, and has a certain amount of interference. 2. After installation, the interference pressure of the oil seal cutting edge and the contraction force of the self-tightening spring generate a certain radial pressure on the rotating shaft. 3. When working, the oil seal lip forms a sealing contact belt of 0.25 to 0.5 mm width under the action of radial pressure. Under the action of the lubricating oil pressure, the oil penetrates into the oil seal edge and forms a very thin oil film between the rotating shaft. The inner friction of the lubricant at the contact and the agitation and extrusion of the lubricant are affected by the surface tension of the oil, forming a “new moon” on the outer edge of the shaft and the oil seal to prevent oil from overflowing and sealing. .

Second, the main factors causing oil seal oil leakage The oil seal is not strict is the main cause of oil leakage. When the shaft wears and forms a groove, even if the new oil seal is replaced, the contact pressure of the oil seal lip and the shaft is lowered, so that the interference of the diameter of the oil seal lip and the shaft diameter after installation is too small. Taking the crankshaft oil seal of S195 diesel engine as an example, the main reasons for the poor sealing are: 1 poor quality of oil seal manufacturing; poor quality of 2 shaft or IKO bearing; 3 improper use and maintenance; IKO bearing measurement error does not mean that the inspection tolerance can be relaxed 10%4 improper installation; 5 improper storage, adversely affected by environmental pollution.

For more information and purchase please visit: https://www.supplyforever.com

Fatigue life, noise life and lubrication life of KOYO bearings

The KOYO bearing's burnout life, noise life and lubrication life are just KOYO bearings. Rolling KOYO bearings during operation, accept a certain load, that is, static load, but for steel balls and raceways, the stress is recurrent, the data will be ignited and burned, and then KOYO bearings will reach the end of life. The phenomenon is that a part of the rolling surface data suddenly disappears like a fish scale. This phenomenon is called burnout. The noise life is very small for the KOYO bearing of the household appliance, the KOYO bearing is very small, and the KOYO bearing has a long service life. However, after the KOYO bearing is operated for a while, wear, vibration noise, grease deterioration, etc. may occur. Because the KOYO bearing noise request for the appliance is serious, when the KOYO bearing noise exceeds the allowable limit, it is considered that the KOYO bearing can no longer be used. The total time of KOYO bearing low noise operation is called KOYO bearing noise life. Lubrication life

KOYO bearings for household appliances are equipped with maintenance-free grease-lubricated KOYO bearings. Although KOYO bearing lubrication requires only a small amount of lubricant, KOYO bearings are poorly lubricated due to deterioration and leakage of grease after a long period of operation, and then KOYO bearings are ineffective. The total time of operation of KOYO bearings under superior lubrication conditions is called KOYO bearing life.

For more information and purchase please visit: https://www.supplyforever.com

The relationship between the track of the bearing and the radial load

When the bearing rotates, the raceway surface of the inner ring and the outer ring of the bearing is in rolling contact with the rolling element, so the running track is a dark surface, and the running track attached to the raceway surface is not an abnormality, so that the load can be known. Conditions, so when disassembling the bearing, please pay close attention to and observe the running track of the raceway surface.

If you carefully observe the trajectory, you will know that you only bear radial loads, withstand large axial loads, withstand moment loads, or have extreme rigidity in the bearing housing. It is possible to check whether the bearing has been accidentally loaded and the installation error is too large, and it is a clue to investigate the bearing damage.

For more information and purchase please visit: https://www.supplyforever.com

Introduction to the structure and performance of joint bearings

The joint bearing is a special type of plain bearing. Its structure is simpler than rolling bearings. It consists mainly of an inner ring with an outer spherical surface and an outer ring with an inner spherical surface. It can withstand large loads. According to its different types and structures, it can withstand radial loads and shafts. Combined load to load or radial and axial simultaneously. Generally used for low-speed oscillating motion (ie, angular motion), because the sliding surface is spherical, it can also be tilted in a certain range of angles (ie, aligning motion), and the difference between the support shaft and the shaft hole is different. When you are old, you can still work normally.

For more information and purchase please visit: https://www.supplyforever.com

Some common terms for rolling bearings

Some common terms and definitions of rolling bearings, mainly rolling bearing generals, radial bearings, thrust bearings, ball bearings, roller bearings, etc.:
(1) General theory of rolling bearings:
1. Rolling bearing: A bearing that performs rolling motion between a load bearing and a moving part relative to each other, which includes a raceway part and a rolling body set with or without isolation or guides, which can be used to bear radial, axial or radial Combined load with the axial direction;
2. Single row bearing: a rolling bearing with a row of rolling elements;
3. Double row bearing: a rolling bearing with two rows of rolling elements;
4. Multi-row bearing: Rolling bearing with more than two rows, bearing rolling bearing in the same direction, it is best to indicate the number of columns and bearing type, for example: "four-row radial cylindrical roller bearing";
5. Full complement rolling element bearing: bearing without cage, the total gap between the circumferential direction of each row of rolling elements is smaller than the diameter of the rolling element and as small as possible, so that the bearing has good performance;
6. Angular contact bearing: a rolling bearing with a nominal contact angle greater than 0° and less than 90°;
7. Self-aligning bearing: a raceway is a spherical shape, which can adapt to the angular deviation and angular movement between the two raceway shaft lines;
8. Separable bearing: a rolling bearing with separable components;
9. Non-separable bearing: After the final assembly, the bearing ring can not be freely separated rolling bearing;
Note: For bearings with different parts to separate parts, for example, ball bearings with double half rings (02, 01, 08) do not specify abbreviated terminology;
10. Inch bearings: Rolling bearings in the original design when the dimensions and tolerances are expressed in English units;
11. Open bearing: rolling bearing without dust cover and sealing ring;
12. Sealing ring bearing: a rolling bearing with a sealing ring on one or both sides;
13. Dust cover bearing:
Rolling bearing with dust cover on one or both sides.

For more information and purchase please visit: https://www.supplyforever.com

Talking about: the use and maintenance of automobile bearings

   Maintenance instructions for automotive bearings:

The vehicle should work within the rated load range. If the overload is severe, the bearing will be overloaded directly, which will cause early failure of the bearing, and more serious will cause vehicle failure and personal safety accidents;

The bearing is prohibited from being subjected to abnormal impact loads;

Regularly check the state of use of the bearing, pay attention to observe whether there is abnormal noise and partial sharp temperature rise in the bearing part;

Regular or quantitative filling of lubricating oil or grease as required;

According to the condition of the vehicle, the lubricant should be completely replaced at least every six months, and the bearings should be inspected carefully;

Inspection under bearing maintenance condition: Clean the bearing under detachment with kerosene or gasoline, carefully observe whether there is sliding or creeping of the inner and outer cylindrical surfaces of the bearing, whether the inner and outer raceway surfaces of the bearing are peeling or pitting, rolling elements and holding Whether the frame is worn or deformed, etc., based on the comprehensive condition of the bearing inspection, determine whether the bearing can continue to be used.

For more information and purchase please visit: https://www.supplyforever.com

How is the bearing vibration generated?

    In general, the rolling bearings in SKF bearings do not generate noise by themselves. The "bearing noise" that is usually felt is in fact the acoustic effect of the SKF bearing directly or indirectly vibrating with the surrounding structure.

    This is why many times noise problems can be considered as vibration problems involving the entire bearing application. Excitation due to the change in the number of rolling elements. When a radial load is applied to a bearing, the number of rolling elements carrying the load will change slightly during operation, ie: 2-3-2-3... This causes a shift in the load direction. The resulting vibration is unavoidable, but can be mitigated by axial preloading and applied to all rolling elements (not suitable for cylindrical roller bearings in SKF bearings).

    When the waviness of the component is closely matched between the bearing ring and the bearing housing or the transmission shaft, the bearing ring may be deformed in cooperation with the shape of the adjacent component. If deformation occurs, vibration may occur during operation. Therefore, it is important to machine the housing and drive shaft to the required tolerances.

    Local damage A small number of bearing raceways and rolling elements may be damaged due to handling or installation errors. In operation, rolling a damaged bearing component produces a specific vibration frequency. Vibration frequency analysis identifies damaged bearing components. Vibration behavior in applications In many applications, the stiffness of the bearing is the same as the stiffness of the surrounding structure. Due to this feature, it is possible to reduce the vibration in the application as long as the bearings (including preload and clearance) are properly selected and their configuration in the application.

For more information and purchase please visit: https://www.supplyforever.com

Rolling bearing accuracy and grade

The accuracy of the rolling bearing is divided into (main) dimensional accuracy and rotation accuracy. The accuracy level has been standardized and is divided into five levels: P0, P6, P5, P4, and P2.
      The accuracy is increased from the 0th level in order, and is sufficient for the general purpose 0 level, but when used in the conditions or occasions shown in Table 1, an accuracy of 5 steps or higher is required.
      Although the above accuracy level is based on the ISO standard, its name is different in national standards.
      Table 2 lists the accuracy levels applicable to the various bearing types and the comparison between national standards.

      Dimensional accuracy (items related to shaft and housing installation)
      1. Allowable deviation of inner diameter, outer diameter, width and assembly width
      2. Allowable deviation of the diameter of the compound circle and the diameter of the outer complex circle in the roller group
      3, the allowable limit value of the chamfer size
      4, the allowable variation of the width

      Rotation accuracy (items related to the rotation of the rotating body)
      1. Allowable radial runout and axial runout of the inner and outer rings
      2, the inner ring allows lateral runout
      3. Allowable variation of the inclination of the outer diameter surface
      4. Allowable variation of the thickness of the thrust bearing raceway
      5. Allowable deviation and allowable variation of tapered bore

For more information and purchase please visit: https://www.supplyforever.com

Selection of sliding bearing grease

Core Tips: 1. Sliding bearings can also be lubricated with grease. The following points should be considered when selecting grease: 1) When the bearing load is large and the speed is low, the grease with a small cone penetration should be selected.
1. Sliding bearings can also be lubricated with grease. The following points should be considered when selecting grease:
1) When the bearing load is large and the speed is low, the grease with a small penetration degree should be selected, and vice versa. High-speed bearings use grease with a small degree of penetration and good mechanical stability. Special attention is paid to the lower viscosity of the base oil of the grease.
2) The dropping point of the selected grease is generally higher than the working temperature of 20-30 ° C. In the case of continuous operation at high temperature, be careful not to exceed the allowable operating temperature range of the grease.
3) When the sliding bearing works in water or humid environment, it should choose calcium-based, aluminum-based or lithium-based grease with good water resistance.
4) Select a grease with good adhesion.
2. Selection of grease for sliding bearings:
The load is <1MPa, the circumferential speed of the journal is less than 1m/s, the maximum working temperature is 75°C, and the calcium base grease No. 3 is used;
The load is 1-6.5MPa, the circumferential speed of the journal is 0.5-5m/s, the maximum working temperature is 55°C, and the calcium base grease No. 2 is used;
The load is >6.5MPa, the circumferential speed of the journal is less than 0.5m/s, the maximum working temperature is 75°C, and the calcium base grease No. 3 is used;
The load is <6.5MPa, the circumferential speed of the journal is 0.5-5m/s, the maximum working temperature is 120°C, and the No. 2 lithium grease is used;
The load is >6.5MPa, the circumferential speed of the journal is less than 0.5m/s, the maximum working temperature is 110°C, and the calcium-sodium grease of No. 2 is used;
The load is 1-6.5MPa, the circumferential speed of the journal is less than 1m/s, the maximum working temperature is 50-100°C, and the No. 2 lithium grease is used.
Load >5MPa The circumferential speed of the journal is 0.5m/s, the maximum working temperature is 60°C, and the No. 2 calendering grease is used;
Calcium-sodium based grease should be considered in a humid environment at temperatures between 75 and 120 °C. In a humid environment, the working temperature is below 75 ° C, there is no calcium base grease No. 3, and aluminum base grease can also be used. When the working temperature is 110-120 ° C, lithium base grease or sulfhydryl base grease can be used. When concentrated lubrication, the consistency is smaller.
3. Lubrication cycle of grease for sliding bearings:
Accidental work, unimportant parts: shaft speed <200r/min, lubrication cycle 5 days; shaft speed >200r/min, lubrication cycle 3 days.
Intermittent operation: shaft speed <200r/min, lubrication cycle once every 2 days; shaft speed>200r/min, lubrication cycle once every day.
Continuous operation, working temperature is less than 40 °C: shaft speed <200r/min, lubrication cycle once every day; shaft speed>200r/min, lubrication cycle once per shift.
Continuous operation, working temperature 40-100 °C: shaft speed <200r/min, lubrication cycle once per shift; shaft speed >200r/min, lubrication cycle twice per shift.

For more information and purchase please visit: https://www.supplyforever.com

Principle of self-lubricating bearings

Core Tip: At present, most of the bearings used in various machinery industries are still balls, needles and the like. Only a small part of the bearings have been self-lubricating bearings. It is believed that in the near future, the bearings will be adapted from the lubrication.
At present, most of the bearings used in various machinery industries are balls, needles and the like. Only a small part of them have adopted self-lubricating bearings. It is believed that in the near future, lubricating bearings will be incomprehensible, wear-resistant and economical. Advantages and become the leading product in the bearing industry. The following are the application characteristics and advantages of some self-lubricating bearings: oil-free lubrication bearing series
1. No oil lubrication or less oil lubrication. It is suitable for places that cannot be refueled or difficult to refuel. It can be used without maintenance or less maintenance.
2. Good wear resistance, small friction coefficient and long service life. 3. There is an appropriate amount of elastoplasticity, which can distribute the stress on the wider contact surface and improve the bearing capacity of the bearing.
4. The static friction coefficient is similar, which can eliminate the creep at low speed, thus ensuring the working precision of the machine.
5. It can reduce vibration, reduce noise, prevent pollution and improve working conditions.
6. The transfer film can be formed during the operation to protect the grinding shaft without biting.
7. The hardness requirement of the grinding shaft is low, and the shaft without the quenching and tempering can be used, thereby reducing the processing difficulty of the related parts.
8, thin wall structure, light weight, can reduce the mechanical volume.
9, the back of the steel can be electroplated with a variety of metals, can be used in corrosive media; has been widely used in various mechanical sliding parts, such as: printing presses, textile machines, tobacco machinery, micro-motors, automobiles, motorcycles and agricultural and forestry machinery and many more.
Introduction to boundary lubrication self-lubricating bearing series
1. Good load bearing and good wear resistance.
2. It is suitable for rotary motion, rocking motion under high load and low speed, and occasions that often open and close under load and are not easy to form hydrodynamic lubrication.
3. Under the condition of boundary lubrication, it can be maintained for a long time without oiling, and the oil is added in the overlayer to make the bearing last longer.
4. The surface plastic layer can leave a certain margin during processing and molding. After the assembly is pressed into the seat hole, it can be processed by itself to achieve a better assembly size.
5. The products are mainly used in automobile chassis, metallurgical machinery, mining machinery, hydraulic machinery, construction machinery, agricultural machinery, steel rolling equipment, etc. JDB solid inlaid bearing series JDB solid inlaid bearing series is a general-purpose basic product, which can adapt to high pressure, low pressure, high temperature, low temperature, oil lubrication, oil-free lubrication or water lubrication. The base of the product is high-strength brass, which doubles the hardness of the ordinary copper sleeve and more than doubles the wear resistance. Widely used in: light industrial machinery, heavy machinery, construction machinery, metallurgical machinery, conveying machinery, etc., such as: continuous casting machine, rolling mill, injection molding machine, paper machine, mold guide column, ship, machine tool and so on.

For more information and purchase please visit: https://www.supplyforever.com