Installation Method of Single Row Deep Groove Ball Bearing Assembly

Although single row deep groove ball bearing components can be a simple installation on the shaft staying the same, and can be up and running immediately, however, if errors occur during installation, early damage is possible generally as rolling single row deep groove ball bearings. Therefore, single row deep groove ball bearing components must be carefully installed in the early time. At the time of installation, you must be careful not to give too much impact, be sure to pay special attention to the installation point, and then start the installation.

In the cylindrical hole single row deep groove ball bearings occasion, the inner ring and shaft, for installation purposes, generally coordinate with a clearance fit. However, in the necessary operation of high-precision and high-speed operation, or a heavy load or withstanding shock loads occasions, the inner ring and shaft combines for an interference fit.

In taper hole single row deep groove ball bearings occasion, because they are installed using an adapter sleeve, even if error of axis dimensions is slightly larger,there will be no problem. Again, in a lot of axial loads occasions, use the stepped shaft as far as possible, contact the inner ring of single row deep groove ball bearings with cylindrical bore with the ledge of stepped single row deep groove ball bearings to used.

First remove the connecting bolts when removing single row deep groove ball bearings. As the thread surface deposits a layer of grease, corrosion products and other sediments, the bolt is not easy to remove, particularly for Severe corrosion bolts, and removal is difficult. You must choose the right tools to disassemble bolt, because the outer hexagonal or hexagon of bolt has been slipping to damage so that removal becomes more difficult. For bolts has rust or with large number of grease, spray at the joining of bolt and nut with solvents (such as rust remover), let solvent goes into thread, so that they are easily removed.

In the removal process of single row deep groove ball bearings, the most difficult job is to remove wheel from the shaft. For key wheels, generally use three-pin puller or four-legged puller for disassembly. Puller should go with the dimensions of wheels, combination right angles hook of every feet of puller with the wheel back side must be suitable, slippage will not occur when putting forth strength. This method is only for relatively wheel removal of small interference fit, for wheels with larger interference fit, often use heating method, or together with hydraulic jacks to demolish.

In the removal process of single row deep groove ball bearings, the most difficult job is to remove wheel from the shaft. For key wheels, generally use three-pin puller or four-legged puller for disassembly. Puller should go with the dimensions of wheels, horses tied to the feet at right angles with the wheel back side with suitable, slippage will not occur when the force imagined. This method only for relatively small wheel removal of interference, interference fit larger wheels, often using heating method, or together with hydraulic jacks to demolish.

Cleaning, cleaning up and assessing quality all parts of single row deep groove ball bearings is a extremely important work after these ball bearings removal. Assessment means that each of the parts and components after operation, compared to the present state of its size, shape, and material properties and component design with the established quality standards, determine which parts can continue to be used, which parts should be repaired, and which should discard and replacenew ones.

Common problems and solutions When installing deep groove ball bearings

1, Any requirements on the mounting surface and the installation location of deep groove ball bearings?

Yes. If the scrap iron, burrs, dust and other impurities from entering in deep groove ball bearings, the bearing in operation will produce noise and vibration, or even damage deep groove roller and steel balls. Therefore, before the installation of deep groove ball bearings, you must make sure that the installation surface and environment clean.

2, Do deep groove ball bearings need cleaning before installation?

Deep groove ball bearings are coated with antirust oil, you need to carefully clean them with cleaner gasoline or kerosene, and then coated with a clean high quality or high temperature lubricant before installation. Influence of cleanliness on the service life of the bearing and vibration noise was considerable. But what we want to remind you is: sealed bearings do not need cleaning and refueling.

3, How to choose the right grease?

Lubrication on the operation and life of has a very important impact on the deep groove ball bearings. I briefly describe the general principles of selection of deep groove ball bearing grease. Grease is made of base oils, thickeners and additives. Grease functions of different types and same type with different brands vary, be sure to pay attention to duing to corresponding speed limit is different. Grease performance mainly determines by the base oil. Low viscosity base oil is suitable for low temperature, high speed situation, while high viscosity oil is suitable for high temperature, high-load situation. The thickener is also related to the lubrication function. Water resistance of the thickeners determines the water resistance of the grease. In principle, grease with different brands cannot be mixed, and, even if grease with the same kind of thickeners, also has a negative impact on each other due to different additives.

4, The more grease,the better when lubricating the deep groove ball bearings?

When lubricating bearings, the more grease,the better, this is a common misconception. Too much grease in bearings and bearing interior will cause excessive mixing of oils and fats, which results in extremely high temperatures. Number of bearing lubricant filling is covered with 1/2~1/3 bearing internal space,reduced to one-third when high speed.

5, How to install and disassemble the deep groove ball bearings?

Do not hammer directly on the surface and non-bearing surface of deep groove ball bearing when installation. Let bearing be an average force with block, sleeve or other installation tools (Tools) . Never install using the ball driving force. If the mounting surface is coated with lubricating oil, it will make the installation more smooth. If combined with interference is greater, put bearing in mineral oil, heated to 80~90℃ and install as soon as possible. Strictly control oil temperature not exceeding 100 ° c to prevent the effect of tempering hardness reducing the impact and recovery. Removing when you encounter problems, we recommend that you use the removal tool to pull on the inner ring at the same time carefully pouring hot oil, and heat makes the bearing inner ring expanding so that making it more prone to shedding.

How to Install Deep Groove Ball Bearing?

Deep groove ball bearings are used in a particularly wide variety of applications. Consequently, they are available in many executions and sizes. The standard SKF range comprises the following types:

– single row deep groove ball bearings
– SKF Energy Efficient deep groove ball bearings
– single row deep groove ball bearings with filling slots
– stainless steel single row deep groove ball bearings
– double row deep groove ball bearings
– single row hybrid deep groove ball bearings, see section “Engineering products – Hybrid bearings
– single row deep groove ball bearings for high temperatures, see section “Engineering products – Bearings and bearing units for high temperatures”
– cam rollers, see section “Track runner bearings – Cam rollers”
– polymer ball bearings, see section “Engineering products – Polymer ball bearings

Deep groove ball bearing is installed correctly is very important, following a few steps outline the main points of the installation of deep groove ball bearings:

Preload requirements

  • For the required precision deep groove ball bearing drive, such as deep groove ball bearing spindle, there are often preload requirements. These deep groove ball bearing preload are reasonable, in order to achieve the nominal accuracy. Deep groove ball bearing preload is generally factory-supplied parameters. The traditional rule of thumb is often the assembly workers install. You can use pre-measured amount of preload deformation method in some structure. Obtained after deformation, the structure design in a tightening gasket, the gasket is just pretension height difference before and after the change. In this way, tighten the nut to ensure death, preload volume remains unchanged.

Clearance before installation

  • If there are burrs, dirt and other foreign matter go into the deep groove ball bearing iron filings, deep groove ball bearings will generate noise and vibration when in operation, or even damage the raceway and rolling elements. Therefore, when install deep groove ball bearings, you must ensure that the mounting surface and installation of the environment clean.
  • Deep groove ball bearings should be cleaned before the installation. Coated with anti-rust oil, you must use gasoline or kerosene to clean carefully and then coated with clean, high-quality, high-speed or high-temperature grease before installation. Cleanliness of deep groove ball bearing will impact the service life and vibration noise is very large.

How to choose the grease

  • How to choose the grease lubrication of deep groove ball bearing that influences the operation and life importantly. Here to brief you the general principles to choose grease. Generally low-viscosity base oil for low temperature, high-speed; high viscosity for high temperature, high load. Thickener is also related to lubrication, grease thickener of water determines the water resistance. In principle, the grease cannot mix different brands, and even if the same kind of grease thickener, also because of the different additives adversely affect each other. Deep groove ball bearings and grease will cause too much room over oil mixing, resulting in extremely high temperatures.

Deep groove ball bearing installation

  • How to install and remove the hammer when installed directly face deep groove ball bearing and non-force side, should be briquetting, sleeve, or other deep groove ball bearing installation tool to make uniform force. If the mounting surface coated with oil, the bearing will be installed more smoothly. Deep groove ball bearings should be placed in mineral oil heated to 90 – 100 ℃ immediately after installation. Difficulty in dismantling, it is recommended that you use the removal tool to pull the inner ring, while carefully poured on the hot oil, deep groove ball bearing inner ring heat will expand, making it easier to fall off.

How to choose the appropriate clearance conditions

  • All of the deep groove ball bearings require minimum clearance work; you must choose the appropriate clearance conditions. Rolling deep groove ball bearing radial clearance group is divided into five groups -2, 0 group, 3 groups, 4, 5 groups, followed by small to large clearance value, where 0 is the standard clearance group. Basic radial clearance group for general operating conditions, temperature, and commonly used conventional interference fit; at high temperature, high-speed, low noise, low friction to work under special conditions such as deep groove ball bearing; of precision spindle, machine tool spindles with deep groove ball bearings, etc. should use a smaller radial clearance; for deep groove ball bearing roller can maintain a small amount of clearance work. In addition, separate type of deep groove ball bearings are indifferent clearance; Finally, deep groove ball bearing clearance work after installed, install the front than the original clearance is small, because the deep groove ball bearings to withstand a certain load rotation, there are deep groove ball bearing and load produced with the elastic deformation. Rolling deep groove ball bearing clearance and preload adjustment process is to improve the precision deep groove ball bearing swivel and carrying capacity, reduce vibration and noise transmission effective means. Assembly work should clarify the concept of deep groove ball bearing assembly clear the technical requirements, while also taking into account the deep groove ball bearing temperature control and good lubrication, the right way to use this process to ensure the ball rolling groove the quality of the bearing assembly.

Article Resource :http://www.isutami.com/topic/t12050901/The-Installation-Of-Deep-Groove-Ball-Bearings.html.Check more about deep groove ball bearing topic,see at http://www.ballbearing-china.com/how-to-install-deep-groove-ball-bearing.html

Single row deep groove ball bearings and tolerances

Single row deep groove ball bearings are particularly versatile. They are simple in design, non-separable, suitable for high and even very high speeds and are robust in operation, requiring little maintenance. Deep raceway grooves and the close conformity between the raceway grooves and the balls enable deep groove ball bearings to accommodate axial loads in both directions, in addition to radial loads, even at high speeds.

Single row deep groove ball bearings are the most widely used bearing type. Consequently, they are available from SKF in many executions and sizes:

–open basic design bearings
–sealed bearings
–ICOS® oil sealed bearing units
–bearings with snap ring groove, with or without snap ring
Other deep groove ball bearings for special applications, shown in the “Engineering products” and “Mechatronics” sections, include:

–hybrid bearings
–insulated bearings
–high temperature bearings
–bearings with Solid Oil
–sensorized bearings
–polymer ball bearings
The SKF product range also includes bearings with a tapered bore. This variant is not included in this catalogue. Information will be provided on request.

Tolerances

SKF single row deep groove ball bearings are manufactured as standard to Normal tolerances.

SKF Explorer single row deep groove ball bearings are produced to higher precision than the ISO Normal tolerances. The dimensional accuracy corresponds to P6 tolerances, expect the width tolerance, which is considerably tighter and reduced to

–0/–60 μm for bearings with outside diameter up to 110 mm
–0/–100 μm for larger bearings.
The running accuracy depend on the bearing size and corresponds to

–P5 tolerances for bearings up to a 52 mm outside diameter
–P6 tolerances for bearings above 52 mm up to 110 mm outside diameter
–Normal tolerances for larger bearings.
For bearing arrangements where accuracy is a key operational factor, some SKF single row deep groove ball bearings are also available with accuracy completely to P6 or P5 tolerance class specifications. The availability of these bearings should always be checked before ordering.

The tolerances for classes Normal, P6 and P5 are in accordance with ISO 492:2002.

Article Resource:http://www.skf.com/portal/skf/home/products?maincatalogue=1&lang=en&newlink=1_1_1

Common failure analysis of FAG deep groove ball bearing failure

Bearing is as main parts of locomotives, especially traction motor and axis box bearing, plays an important role on security transport .When locomotive is online, once FAG bearing goes wrong, it will led to whole column train not running, and block transport line, especially passenger train is in a malfunction, it causes bigger negative effect. Once locomotive bearing goes wrong, it is difficult to repair. Therefore, preventing and reducing locomotive bearing fault, is important for security transport of locomotive. So, detect the deep groove ball bearings front bearing with security risks, and ensure qualified bearing parts on the train are.

1. Contact fatigue failure

Contact fatigue failure means, bearing surface is subjected to alternating stress and failure. Contact fatigue spalling happens on the FAG bearing working surface, often accompanied by fatigue crack. Firstly occurs from the contact surfaces of the following maximum alternating shear stress, and then extends to surface forming different peeling shapes. Flaking surface is expanding gradually, and tends to spread to deep, forming a deep peeling. Deep spalling is the source of contact fatigue failure.

2. Wear failure

Wear failure means that the bearing surface’ sliding relative friction causes constant wear and tear of its surface and then failure. Constant wear will cause damage of FAG bearing parts gradually, and eventually led to the loss of dimensional precision of deep groove ball bearings and other related issues. Wear can affect the shape change, clearance increased and surface morphology changes, might affect the lubrication function of lubricants, thus the loss of rotational accuracy of bearings and even fail to operate properly. Wear failure is one of the common failure modes of all kinds of bearings, it is generally divided into abrasive wear and adhesive wear by its wear form.

Serious damage of deep groove ball bearing is often not caused by single reason, but under the several combined effects, and in bad running conditions, leads to serious burning loss of FAG bearing, therefore, after accident occurs, it is often difficult to judge what reasons it is due to, So for discussion convenient, i analyze the causes for you from several aspects.

When bearings are used after a period of time, bearing inner ring, rolling elements and cage, outer ring, raceway etc all have certain defects, and injuries, which causes poor lubrication and fever of FAG bearings. Fever for a long time will cause results below:

1, dilution of bearings lubricant

2, accelerate material fatigue and decline in hardness.

Further vicious circle of these reasons accelerates the bearing overheated then burning loss. Significant displacement of the inner ring of deep groove ball bearings, rolling element out-of-round, overheated, eventually are melt together. When the locomotive is running, if found severe heat and smoke, don’t stop it, and maintain to run to the front station. Because overheated bearings are in the melt state at the moment, once stopped to cooling, you can no longer walk then plug the line.

Four specific ways to handle high temperature of deep groove ball bearings

When temperature of deep groove ball bearing rise, first determine whether the malfunction is wrong, if it rises indeed, it should be dealt with as follows:

(1). check cooling water pressure, flow and whether pipe systems are functioning correctly. If the water pressure low, may be filter clogged, you can shut down if cannot be processed in a timely manner, when it works, put into use again.

(2). check the speed governor oil pressure, low oil pressure may cause the cooling water of hydraulic valve close.

(3). check bearing abnormal noise, and inspect the swing of deep groove ball bearings for exceptions.

(4). take sample to observe whether oil color is changing, and test to see if bad. If confirmed, shut down replace new oil.

(5). check whether oil level is normal, if irregular, check that the oil drain valve is closed. If it is closed tightly, please supplement oil, if sealing pad is oil leakage, stop the machine and handle it.

When we use bearing, if its in very hot situation, then quickly stopped operating, and then find out its causes, and provide solution for processing in accordance with the above. But, due to different reasons for heat of deep groove ball bearings, there are different ways to resolve, so it should be treated and completed with the assistance of technical staff.

(A) filling grease method

So-called filling grease method is to fill in the right amount of grease to the bearing working surface regularly, which is one of the most commonly used way of lubricating grease.

(B) oil Cup method

Oil Cup method is to set the capping oil cup or pressure oily cup on bearing housings, rotating the capping and injecting the grease on with grease guns to apply grease injection. This is a commonly used way of lubricating grease.

(C) pressure for grease method

Pressure for grease method is to rely on the grease pump for grease. You should use good fluidity of lubricating grease.

(D) Centralized greasing method

Centralized greasing method is to supply grease for the deep groove ball bearings and other parts through the grease pump. Similarly, the grease used should be sacrifice good liquidity and excellent oxidation resistance and corrosion resistance.

Important factors in rupture of deep groove ball bearing cage

Important factors in rupture of deep groove ball bearing cage

 

Rupture of deep groove ball bearing cage belongs to the occasional and non-normal failure mode, we should analysis the causes of IKO bearing cage fracture following the five aspects below.

1,deep groove ball bearing is poor lubrication: IKO bearings is running in a lean State, forming adhesive wear, and deterioration of the working surface. Tear matter produced by adhesive wear is easy to enter into the cage, so that cage is in abnormal loads, has the potential to cause rupture of cage.

2,creep phenomena of deep groove ball bearings: creep mostly means sliding phenomenon of finger rings, in case of insufficient interference combined with surface, the loading point moves around due to sliding, direction ring relative to the circular shaft or housing location deviation.

3,cage of deep groove ball bearing material defects: cracks, large blocks of metal inclusions and shrinkage cavity defects, bubble and riveting short nails or nails, pad in half cage surface voids, serious damage may cause, these all may cause cage fracture.

4,deep groove ball bearing cage is abnormal load: not installed in certain place, tilt, and excessive interference,which easily caused tour gap reduced, increased friction and heat, surface softened, prematurely appeared exception peeling. As peeling extended, peeling foreign body entered into the frame hole, leading to the cage running block and producing attached load, increased cage wear. Such a deterioration in the loop, will may cause the cage fracture.

5,hard foreign body invasion: intrusion of foreign body exacerbates the cage wear and generate exception additional load, which can cause the cage fracture.