Miniature bearings heating Precautions

Miniature bearings in addition to being heated and cooling, the internal friction of the bearing operating temperature also play a big role in the decision. Low friction bearings: radial load deep groove ball bearings, miniature row angular contact ball bearings and cylindrical roller with cage Bearings. Contact sealed bearings, full complement cylindrical roller bearings and thrust roller bearings will have a greater friction. Heating miniature bearings precautions are:
1, the yoke placed on the end face of the host.
2, insert the plug into a power outlet control switch on.
3. Check the grounding line is good, after the energizing test pencil test.
4, press the start button, the host power.
5, check the yoke on the ground should be no voltage.
6, press the stop button Host powered off, stop heating.
7, depending on the specifications of miniature bearings or other workpieces, choose a different yoke put, this yoke on the top surface of the host, should fit flat.
8, when heated miniature bearings, sensors should be inserted into the "sensor socket" and the sensor close to the workpiece is heated.

What thin section bearing lubrication is intended to join

thin section bearing is a rolling bearing, use the time to reduce internal friction and wear of the bearing to prevent burning stick, you need to add the lubricating effect, adding the purpose of lubrication to ①reduce friction and wear ② in the ring, and the rolling elements constituting the bearing retainer mutual contact portions to prevent the metal contact, reducing friction, wear ③ fatigue life of rolling fatigue life, in rotation, the rolling contact surfaces oiled, will be extended. Conversely, low oil viscosity, poor lubricating film
thickness is shortened discharge of frictional heat, cooling ④ circulating oiling method, etc. can be discharged oil heat generated by friction or heat coming from the external cooling. Prevent bearing overheating and prevent oil itself aging ⑤ to prevent dust and debris inside the bearing, or prevent rust, corrosion effect.

slewing ring bearings are nearly four decades the gradual rise

slewing ring bearings are nearly four decades the gradual rise in the world of new mechanical parts, which have inner and outer rings, rolling, etc., is a comprehensive large bearings to withstand load, can withstand large axial, radial load and tilting moment. Slewing ring in reality very broad industrial applications, known as: "the machine joint" is subject to the relative rotational movement between the two objects, and the need for simultaneous axial and radial forces, tilting moment by machinery required important transmission components. With the rapid development of the machinery industry, the slewing ring in marine equipment, engineering machinery, light machinery, metallurgical machinery (metallurgical bearing), medical equipment, industrial machinery and other industries has been widely used.

Thin slim ball bearing characteristics

slim ball bearing to achieve a very thin section bearing, but also to achieve a product miniaturization and lightweight. Diversity of products has expanded its range of purposes. In order to obtain a low friction bearing torque, high rigidity, good rotary precision, small diameter steel balls. Using a hollow shaft, ensuring lightweight space and wiring. Thin wall bearing rings were deep groove ball bearings, four point contact bearings, angular contact ball bearings. In different series are available in a variety of dollars more. Series depends on the cross-sectional size. Match ball and series. Deep groove ball bearings can support bi-directional axial load and radial load.

How to store the correct slewing ring bearings

slewing ring bearings, it can withstand a large axial load, radial load and overturning moment large bearings. Generally with mounting holes, internal gears or external gears, lubricants holes and sealing devices, which enable the host compact design, guide reliable, and easy to maintain. However, because the user does not pay attention slewing transportation, and other storage, installation and maintenance details, resulting in performance degradation host phenomenon can not be ignored. Slewing rings coated with anti-rust oil at the factory, and with the film wrapped, the packaging rust usually valid for 3-6 months, it should be raised year after inventory grease and check rotation flexibility, not collision and squeeze, not rain, storage should be smooth. It should be stacked flat isolation between slewing ring. Slewing ring generally have lifting holes, you can secure the lifting eyebolts screwed.

Characteristics and principles of presentation slewing bearing

Slewing ring turntable bearings, also known, is a comprehensive large bearings to withstand load, can withstand large axial, radial load and overturning moment. Wheel bearings in general with mounting holes, internal gears or external gears, lubricants holes and sealing devices, which enable the host compact design, the guide is simple, easy to maintain. Have toothed wheel bearing, external tooth and internal tooth four-point contact ball bearings, double row angular contact ball bearings Crossed cylindrical roller bearings, tapered roller bearings and cross three-row cylindrical roller bearings four series compound , the wheel bearings large rotary devices are widely used in lifting machinery, mining machinery, construction machinery, port machinery, ship equipment and high-precision radar and missile launchers and other mechanical equipment. But also according to the user's specific requirements and design, development and production of special structures wheel bearings.

Spherical roller bearings and tapered roller bearings are characterized by role

Spherical roller bearings with two rollers, the main receiving radial loads, but also can accept either direction axial load. A high radial load capacity, especially suitable for heavy loads or vibration, but can not accept the pure axial load. This kind of bearing outer ring raceway is spherical shape, so the good performance of its self-aligning, can compensate concentricity error. Tapered roller bearings are mainly used to accept radial load mainly radial and axial load. Compared with the angular contact ball bearings, bearing capacity, low speed limit. Tapered roller bearings can accept axial loads in one direction, a direction to limit the axial displacement of shaft or housing.

Commonly used thin-walled rings bearing

Thin wall bearing rings can be deep groove ball bearings, four point contact bearings, Angular contact ball bearings. In different series are available in various designs over. Series depends on the cross-sectional size. Match ball and series. Deep groove ball bearings can support bi-directional axial load and radial load. four point contact ball slewing bearing can support bi-directional axial load and radial load; therefore they are in contact with the same operating mode double row angular ball bearing. Angular contact ball bearings can match the optimal number of balls and the contact angle of 30 °. They support radial loads than deep groove ball bearings or four point contact bearings higher, and can support axial loads from the same direction. For special needs, angular contact ball bearings are also available as matched bearings provide. Therefore, rigidity and load carrying capacity of these combinations than single bearing products to be much higher.

In practical industrial applications, cross roller slewing ring is called: "the machine joints"

The main applications are widely used: Truck cranes, railway cranes, harbor cranes, ship cranes, metallurgical cranes, container cranes, excavators, filling machines, Angular contact ball bearings as well as CT machine standing wave treatment, navigation, radar antenna base, deck crane bearing missile launchers , tanks, robots and a revolving restaurant, and so on. Slewing bearings are widely used in rotary initial application engineering machinery is also the most widely used in areas such as earth-moving machines, excavators, crushers, stackers and reclaimers, graders, rollers, compactors, drilling machines, drilling machines. Others include: Concrete: Concrete pump truck, concrete mixing machinery boom, with fabric machine.

The Features of Spherical roller thrust bearings

spherical roller bearing use asymmetrical rollers of spherical shape, rolling inside a house washer with a raceway with spherical inner shape. They can accommodate combined radial and axial loads and also accommodate misalignment of the shafts. They are often used together with radial spherical roller bearings. Spherical roller thrust bearings offer the highest load rating density of all Thrust Ball Bearings.Spherical roller bearing outer ring and the bearing housing bore should not use an interference fit with the inner ring and the journal should not be too tight, requiring adjustment nut should be used to produce energy in the installation more flexible axial displacement. Spherical roller bearings because if interference fit easily change the contact angle of the bearing, resulting in uneven distribution of bearing loads, cause high temperature. Therefore, this type of installation with the inner bearing journal and bearing outer ring and the housing bore, the general should be hands thumbs can just push the journal bearing and the housing bore for the best.

Slewing bearings

in the Rolling technical field wheel bearing in the first class products throughout the world. These mechanical components have repeatedly proved its high load capacity, wide range of applications and cost-effective. Due to their design, a single bearing can be Supported by the radial, axial and tilting moment loads. Therefore, in many cases, it can be replaced by a single bearing the combination of Radial Bearing and axial bearing of the bearing arrangement. In many cases, it is largely located in the adjacent structure Meter and bearing reduces installation cost and effort necessary. Double sealed wheel bearings, grease lubricated with high quality, it can lubricate the nozzle lubrication and very easy to install again. Bearing ring provides gearless, or to Achieve simple drive provided with external or internal gear bearings.

Crossed Roller Bearing Inspection noise type and identification of causes

Crossed Roller Bearings abnormal sound occurred during the operation, a wide range of formation mechanism is more complex, factors that are multifaceted, and various abnormal sound often added together, it is difficult to distinguish, mainly due to the following categories:
1. The bearing inner and outer raceway presence bump hurt, scratched or periodic vibration pulse serious defect.
2. Scroll surface bump hurt of rolling bearing, aperiodic oscillation pulse scratches and other defects caused.Periodic or aperiodic oscillation pulse
3. Since residual magnetism adsorption iron powder present on the raceways or rolling elements caused.
4. impurities or dust into the bearing raceway pulse caused by aperiodic vibration. Must be done in space when high cleanliness of cross roller bearing assembly.
5. aperiodic oscillation pulse violent collision between the rolling element and spacer blocks caused.
6. poor performance lubricants, rolling vibration pulse generated when the lubricant sliding friction between the rolling element and spacer blocks and the rolling elements running. Crossed roller bearings senior grease, in order to ensure the use of sophisticated demand environment.

Flange Slewing Bearing classification

In reality, very broad industrial applications, known as: "the machine joints", which are widely used in major applications: cranes, railway cranes, harbor cranes, ship cranes, worm gear speed reducer metallurgical cranes, container cranes, excavators, irrigation installed, as well as CT machine standing wave treatment, nautical instruments, radar antenna base, missile launchers, tanks, robots and a revolving restaurant, and so on. Slewing bearings are widely used, construction machinery was originally applied slewing ring is the most widely used in places such as earth-moving machinery, excavators, disintegration machine, stacker reclaimer, graders, rollers, compaction machines, self-aligning roller bearing drilling machines, boring machines. Others include: Concrete: Concrete pump truck, concrete mixing machine boom, belt fabric machine. 

Spherical roller bearings Needle Roller Bearing

Spherical roller bearings have two raceways between the inner and outer ring raceway is spherical, equipped with a drum-shaped roller bearings. The outer ring raceway curvature Taper roller bearings center and bearing center line, so has the same self-aligning ball bearing self-aligning feature. When the shaft, shell deflection occurs, you can automatically adjust load and axial load in two directions. Radial load capacity, for a heavy load, impact load conditions. Inner diameter is tapered bore bearings can be installed directly. Or using an adapter sleeve, remove tube installed in the cylinder axis. Cage with steel stamping cage, forming polyamide cage and copper alloy machined cage.For the self-aligning bearing, in the bearing housing bore the loading zone axis, using an intermediate mounting ring prevents tilting and rotating the outer ring. It should be deck crane bearing remembered that some dimensions of self-aligning ball bearing ball bearing protruding from the side, so the middle of the ring should be installed recessed to prevent damage to the ball. A large number of bearings are generally used mechanical or hydraulic press for the installation method.

Needle Roller Bearing Is there a hybrid ring

Left hand holding the bearing sleeve body, right hand toggle coat a small margin to rotate back and forth, listening to the bearings during operation if there is mixed response. inch bearing Most counterfeit products due to production conditions of backwardness, completely hand-mill operation, bearing the body in the production process will inevitably be braced with dust, sand a class of impurities, so that the rotation of the bearing ring or when there will be hybrid phenomenon does not run smoothly . This is to slewing bearing determine whether a product comes from a strict production standards, and the key with the regular operation of the machine manufacturer's brand products.

Deep groove ball bearings

Deep groove ball bearings are bearing the most common type. The basic model consists of a deep groove ball bearing outer ring, an inner ring, a steel ball and a group of holding structure into. Deep groove ball bearing type has two kinds of single and double row deep groove ball structure also split seal and open two structures. Dust closures material is steel stamping, just play simple to prevent dust from entering the bearing raceways. Anti oil type of contact seal, which can effectively prevent the grease within the bearing spill. Deep groove ball bearings mainly take radial load, but also to support radial and axial load. When the only radial load, the contact angle is zero. When the deep groove ball bearings with a larger radial clearance, the performance with angular contact bearings, can withstand greater axial load, deep groove ball bearing friction coefficient is small, speed is also very high.

Flange bearings

The flange and the bearing became known as one of the bearing flange bearings, products with a flange on the outer ring, enabling axial positioning easy, no longer need housing, become more economical. It is low in order to get the bearing friction torque, high rigidity, good rotation accuracy, use a small diameter steel balls. The use of hollow shaft, ensuring lightweight space and wiring. When the end of the shaft is not connected pieces, such as plates need to be fixed in the plane, on a wall, flange bearings to reflect its superiority. In the ultra-small aperture miniature bearings, bearing dust cover plate can be divided into ZZ series, RS rubber bearing seals series, Teflon bearings seals series, flange series, stainless steel series, ceramic ball series. Miniature ball bearings with a wide range of uses. For high-speed rotation, low friction torque, low vibration, low noise requirements of the product.

Single row cylindrical roller bearings and double row cylindrical roller bearings distinction

Single row cylindrical roller bearings are separable bearings, easy installation and removal, two rings may be a tight fit, the contact line of the rollers and raceways between the modified can be reduced stress concentration. Double row cylindrical roller bearings are non-locating bearing, separable makes its easy installation and removal. Two rings can be a tight fit. Double row cylindrical roller bearings almost not allowed to have an inclination angle. When installing the rolling ball bearings and cylindrical roller bearings, all parts are installed concentric must be strict, so as not to skew the inner sleeve of the jacket. The only way to ensure concentricity to note that boring process, installing or removing the force can not be transmitted directly through the rollers and the cylindrical ring wall.

Slewing ring bearing noise solution

Slewing bearing noise common with dust and scratches acoustic sound two solutions side as follows:
(1) dust control method sound, there is support within the rotary dust and other foreign matter, non-periodic vibrations occur, the so-called dust acoustic, the size of the vibration and noise uncertainty, and with or without. Dust acoustic control method: the cleaning methods to improve slewing ring / wheel bearing, front bearing installation, shaft, housing bore and mating parts all in strict cleaning clean; remove foreign matter within the lubricant; to improve the bearing seal; avoid the use of impure material or embedded foreign objects plastic cage.
(2) control method scars sound, slewing ring rolling surface if crack, indentation, or rust occurs like a rivet as a periodic vibration and noise, the cycle may be fixed but mostly related to a certain speed correspondence, scars continuously occur on the channel, the scars on the ball on time is now hidden, and this noise with the installation and lubrication conditions and there are some changes. Such noise control method: When installing non-percussion bearing, the bearing and shaft assembly before loading ramp bearing to prevent bearings mounted when; when the inventory to prevent shock and vibration to prevent bearing corrosion and transport; the use of high viscosity grease .

Slewing ring bearings

Slewing ring, is a comprehensive large bearings to withstand load, can withstand large axial, radial load and overturning moment. Slewing ring bearings are generally installed with a hole, the internal gear or the external gear, lubricants holes and sealing devices, which enable the host compact design, the guide is simple, easy to maintain. Slewing ring bearings with or without gear, external tooth and internal tooth four-point contact ball bearings, double row angular contact ball bearings Crossed cylindrical roller bearings, tapered roller bearings and cross three-row cylindrical roller bearings four composite.

rotary bearing,linear plain bearings

rotary bearing is a kind of important modern machinery and equipment parts. Its main function is to support the mechanical rotator, reduce the coefficient of friction in the process of the movement, and guarantee its rotation accuracy.

By the frictional properties of motion elements, linear plain bearings can be divided into two categories, the rolling bearing and sliding bearing. The rolling bearing is standardization, seriation, but compared with sliding bearing radial size of it, the vibration and noise is bigger, the price is higher also.

Rolling bearings generally consists of outer ring, inner ring, rolling body and keep the frame of four parts. According to the shape of the roller, the rolling bearing can be divided into two types: ball bearings and roller bearings.

The composition of the ball and roller combined bearing

The work of ball and roller combined bearing is sliding friction; The rolling friction is mainly depends on the size of the manufacturing accuracy; And the size of the sliding bearing friction is mainly depends on the slip plane of the bearing material. thin section bearing generally face all have self-lubricating function; Sliding bearing according to the material divided into sliding bearing and sliding bearing metal, not of metal.

Non-metallic sliding bearing mainly plastic bearings, plastic bearings are generally USES the engineering plastic with good performance comparison; More professional manufacturers generally have self-lubricating engineering plastics modification technology, through the fibers, special lubricants, glass beads and so on to self-lubrication engineering plastics modification to enhance performance, and then use modified plastics by injection molding processing into self-lubricating plastic bearings.

Metal sliding bearing is currently the most used three layer composite bearings, the bearings are generally based on carbon steel substrate, through sintering technology in steel plate on a layer of spherical copper powder sintered first, and then sintering layer on copper powder layer is about 0.03 mm PTFE lubricant; One intermediate layer spherical copper powder main effect is to enhance the bonding strength between the steel plate with PTFE, at work, of course, also have certain bearing and lubrication effect.

the main features of metallurgical bearing

Commonly used material of metallurgical bearing is bearing alloy (also called babbit or white metal), cross roller bearings wear resistant cast iron, copper and aluminum alloy, powder metallurgy materials, plastics, rubber, hardwood and carbon - graphite, PTFE (teflon, PTFE), modified polyformaldehyde (POM), etc.

rolling mill bearing

rolling mill bearing work under sliding friction bearings. Sliding bearing work steady, reliable, no noise. Under the condition of fluid lubrication, sliding surface is lubricating oil without direct contact, also can greatly reduce the friction loss and wear of surface oil film also has a certain vibration absorbing ability. But starting frictional resistance is bigger. The double direction thrust ball bearing parts of the shaft are called journal, and shaft neck matching parts called bush. In order to improve the bearing surface of the friction properties and in them on the surface of cast anti-friction material layer is called the bearing bush. Bearing and bearing liner material collectively known as the sliding bearing material. Sliding bearing applications generally under the condition of low speed and heavy loading conditions, or maintenance and charging of lubricating oil is difficult work.

The linear bearing

miniature linear bearings is used in linear motion ball or sliding bearing. high precision ball bearings consists of a plastic cage, guide the ball rolling with bearing of hardened steel rolling way. Bearing on grinding hardening axis movement. Linear sliding bearing consists of a plastic sleeve, sleeve is installed in the steel bearing box, mobile in grinding optical axis.

single direction thrust ball bearing the matters needing attention

single direction thrust ball bearing fatigue rupture caused by unbalanced vibration, the deflection of shaft and edge load, overload, babbitt slewing bearing manufacturer fatigue rupture. Bearing repair installation quality is not high 1, improve the quality of installation, reduce the bearing vibration

2, prevent partial load and overload

3, adopt appropriate babbitt, and a new bearing structure

4, strictly control the temperature rise

Hair big particles as lubricating oil dirt into the bearing clearance, and embedded hidden on the bearing bushing, the bearing contact with the journal (or thrust plate), the formation of crusts, when running seriously scratch the surface of the shaft, note oil clean hair bearing, especially of maintenance, should pay attention to the metal dust or dirt to clean clean

the Maintenance methods of four point contact ball slewing bearing

four point contact ball slewing bearing Damage type failure due to handle method

Agglutination bearing overheating and excessive load, improper operation or the temperature control system failure 1, found in sports such as bearing overheating, should immediately stop check, had better take the rotor at low speeds continue to run, or continue to fuel supply for a period of time, until the bearing shell cooling down. Otherwise, the bearing shell on the babbitt due to glue stick on the shaft neck, trouble to fix it

2, prevent the lubricating oil is insufficient or oil mixed with impurities, and the rotor of the installation

3, damage to the glue, lighter offshore crane bearing shell can scrape grind repair method to eliminate, continue to use

Thrust Roller Bearings

Thin section bearing is a bearing inside diameter and outside diameter is less than a specified value.Bearing outer diameter and inner diameter of the bearing ratio was 1.25, called thin-wall spherical bearings, this suggests that the outside diameter of the bearing-inner diameter with a smaller value, bearing walls are very thin, so called thin-wall ball bearings.Series super thin section bearings, high precision is required, because the walls are very thin, so it can carry the weight is also very low, poor impact resistance, so depending on the use environment to make choice!! Thrust Ball Bearings structure is simple, easy to use.Mainly used to accommodate radial loads, but when you increase bearing radial clearance, performance has a certain amount of angular contact ball bearings to withstand radial, axial joint loading.Thrust ball bearings with high speed and should not be used, or subjected to purely axial load.Compared with other types of bearings of the same size, these bearings low friction, high speed limit.But do not
Impact resistance, not suitable for heavy loads.Specific use of model airplanes, remote control cars, machine tools, motors, pumps, agricultural machinery,high precision bearings textile machinery, laser printers, instrumentation, measuring instruments, electronic components, motors, motor and so on.

Slewing rings

Slewing is able to withstand the combined load bearing and can also withstand greater axial and radial load and overturning moment.
slewing ringses are also called wheel bearings, slim ball bearing  some people also call it: rotating support, maneuver support.
Slewing rings is widely used in the real industrial, known as: "the joints of the machine", is subject to the relative rotary motion between two objects, and also withstand axial, radial, overturning moment of machinery necessary for important parts.With the development of machinery industry, pivoting on ship equipment, engineering machinery, light industry, machinery, metallurgy, machinery, medical equipment, industrial machinery and other industries a wide range of applications.
Slewing bearing industry in China has gone through more than 20 years of development, since the JB2300-84 was first published in 1984 in the slewing bearing types, basic parameters and technical requirements for standard, and JB/T2300-1999 in the 1999 amendment of the slewing ring standard,  Other bearing China has been provided with a complete set of development and capacity of slewing bearings are designed, manufactured and tested.

Ring bearing

LYHY bearings is good at thin section bearing. crossed roller bearings The following is some of the models, for more information, pls feel free to contact us.
Sealed type deep groove ball bearing linear ball bearing
JA020CP0, JA025CP0, JA030CP0, JA035CP0, JA040CP0, JA042CP0, JA045CP0, JA047CP0, JA050CP0, JA055CP0, JA060CP0, JA065CP0,
JB020CP0, JB025CP0, JB030CP0, JB035CP0, JB040CP0, JB042CP0, JB045CP0, JB047CP0, JB050CP0, JB055CP0, JB060CP0, JB065CP0,
JU040CP0, JU042CP0, JU045CP0, JU047CP0, JU050CP0, JU055CP0, JU060CP0, JU065CP0, JU070CP0, JU075CP0, JU080CP0, JU090CP0, JU100CP0, JU110CP0, JU120CP0,
JG120CP0, JG140CP0, JG160CP0, JG180CP0, JG200CP0,

Slewing ring bearings

1. Single-row design with four-point raceway geometry
2. Untoothed rings with flange thicknesses of 12 and 21 mm
3. Ball diameters 20 and 32 mm
4. Available ex stock or self aligning bearings with a short delivery time as standard series in 14 sizes
5. Raceway diameters of 314 to 1,094 mm or 955 to 1,455 mm
6. For applications with light loads
7. Enables lightweight structures in spite of large bearing diameters
8. Applications: Handling technology,tapered bearing manlift platforms, turntables

Factors influencing the performance of thin-walled ball bearing effect

When there are clearance fit between mobile crane bearing outer ring and bearing seat hole, the existence of eccentric distance m between the bearing center O and the bearing seat center O ', as shown in Figure 1.

  Because of the existence of the gap, the outer ring of the bearing, isolated point supported state, at this time the thin wall bearings under external load, the outer ring will be deformation occurred, causing the ball bearing load distribution of rolling mill bearing body load distribution and the rigid support compared have changed greatly, at the same time effect the thin-walled ball bearing service life, stiffness properties.

The establishment of flexible supporting thin angular contact bearing model

According to the thin wall of an aeroengine with angular contact ball bearing AC71907 as an example to analyze.

  Bearing parameters, outer diameter is 55mm, the outer ring raceway diameter is 50.586mm, the inner diameter is 35mm, the inner ring raceway diameter is 39.423mm, the ball diameter 5.556mm, the ball number 15, ( thin wall bearings )the initial contact angle of 25 deg..

  Between the bearing seat and the bearing outer ring is in interference fit, with the gap of m in 0-15um.

Thin wall bearing in recent years

In recent years, with the development of finite element, boundary element numerical calculation method, to consider the ferrule deformation and boundary condition of load distribution of rolling mill bearing is possible.

  This paper established a flexible support thin angular contact ball bearing finite element analysis of the load distribution model, considering the ferrule deformation and boundary conditions on the bearing load distribution, the influence law of life and stiffness properties of the ANSYS tutorial,（thin wall bearings ）and the calculated results of the finite element method and quasi dynamic method and the experimental results are compared.

Thin wall bearing and aero engine

For some special rolling mill bearing , such as aviation engine in order to reduce the weight and the use of thin wall bearing , fit for a gap between the bearing outer ring and bearing seat hole case, because the thin wall ring rigidity is small, with the accuracy of both will have influence on the internal load distribution of bearing, displacement calculation of load distribution at this time ，

  When considering only contact the deformation is the displacement of Hertz is not enough, must consider the bending deformation after loading effect on the load distribution of the inner ring and the outer ring, radar bearing ， which is the so-called flexible supporting bearing load distribution problem, which makes the theoretical solution increased the degree of difficulty.

Thin wall bearing ANSYS tutorial

Load distribution of rolling mill bearing in mechanical basic research is the rolling bearing determines the performance and the service life of bearing. The calculation of the general working conditions of rolling bearing load distribution,thin section bearing often do not consider the influence of coordination and elastic deformation of the outer ring and the bearing factors.

  Jones based on Hertz contact theory and the rigid ferrule hypothesis is proposed on the quasi dynamic method, slewing ring bearings used to calculate the rolling characteristics of bearing load distribution. This treatment results and actual situation although there are differences, but because the calculation method is simple, is still widely used in practical engineering ANSYS tutorial.

Modeling of thin-wall angular contact ball bearings

Because the need analysis of multiple change, load structure parameters on the performance of thin wall bearings, so in order to reduce repeated work analysis in modeling software ANSYS, design language in this paper using ANSYS finite element software provides the APDL parameter,

  the command to write parametric modeling of thin-wall angular contact ball bearing component of the flow, simplifies the process of repetition modeling,
and its optimal design and the two development laid a good.

The thin-wall angular contact ball bearings

In order to accurately calculate the flexible bearing load distribution, taking the outer ring isolated point supported thin-walled angular contact ball bearing for example, the establishment of a three-dimensional finite element analysis model, considering the outer ring after loading of bending deformation of the rolling body effect of load distribution, thin section bearing

  Analysis under different working conditions of bearing load distribution, change law of life and stiffness properties, and the calculated results of the finite element method and quasi dynamic method and the experimental results were analyzed and compared, ANSYS tutorial.

  The results show that,radar bearing ， the finite element method calculation results and experimental results are more close.

Slewing bearings used in construction machinery

Slewing bearings are widely used thin section bearing , engineering machinery is the most extensive application ofslewing bearing is initially applied places, such as the earth moving machinery, excavators( excavator bearing ),disintegrating machine, stacker reclaimer, flat machine, roller, compaction machine, drillingmachine, boring machine etc.. There are other,

• Concrete Machinery, concrete pump truck, concrete mixer cloth rod integrated machine, belt conveyor
• Feeding Machinery, disc feeder, sand mixing machine
• Crane, wheeled crane, crawler crane, portal crane, tower crane, fork type crane, crane, crane with Longmen
• Foundation Processing Machinery, percussive reverse circulation drill, rotary drilling rig, percussiverotary drill, rotary drilling rig, reverse circulation rotary drilling rig( rotary bearing ), normal circulation rotary drilling rig, long spiral engineering drilling machine, submersible drilling machine, static pressure pilemachine, piling machine
• Engineering Ship,dredger,ship loader bearing
• Special Purpose Vehicle,bridge detection vehicle, fire truck, window cleaning machine, plate girder transport vehicle, aerial vehicles, self-propelled aerial work platform
• Light Industry Machinery, beverage machinery, bottle blowing machine, packing machine, filling machine, rotary bottle arranging machine, injection molding machine,The ship crane.

Four series of slewing ring bearings

Slewing ring bearings, a comprehensive load to bear a large bearings,can bear larger axial and radial load and overturning moment at the same time. Slewing ring bearings are generally installed with a hole, internal or external gear lubricants hole and sealing devices, which enable mainframe, design guide is simple, compact structure, easy maintenance.

  Slewing ring bearings have four series, four point contact ball bearing of no tooth type, external gear and the internal gear type ,double row angular contact bearing ,cross cylindrical roller bearing, crossed tapered roller bearing and three row cylindrical roller combined bearing .

  Four point contact ball slewing bearings have higher static load capacity, cross cylinder the roller has a higher dynamic load capability, crossed tapered roller bearing preloaded can make bearing with large supporting rigidity and rotation accuracy, three row cylindrical roller combined bearings due to highly improving the carrying capacity of the bearings, a variety of power by different raceway bearing, so in the same under the condition of stress, the bearing diameter can be greatly reduced.Thus the characteristic make  host more compact is a kind of slewing bearing of high bearing capacity.

  Slewing ring bearings are widely used for hoisting machinery, mining machinery, construction machinery, port machinery, ship machinery ,large rotary device, high precision radar mechanical and missile launchers on the equipment. At the same time,  design according to the specific requirements of users,development and production of various special structure of slewing bearing.

New machinery component

Slewing ring bearings are new type of mechanical parts for nearly forty years gradually on the rise in the world, which have inner and outer ring, rolling body composition, etc. at present, Chinese shaping slewing bearing production, mainly in the early 80 by the Ministry of machinery industry specified Tianjin Engineering Machinery Research Institute organized to introduce the design and manufacturing technology of the former Federal Republic of Germany Rothe company Erde.

  Released in December 20, 1984, the Ministry of machinery industry standard of the people's Republic of China， JB/2300-84 Rotary Bearing Types, Basic Parameters and Technical Requirements, mainly by the Ministry of machinery and electronics industry of Tianjin Engineering Machinery Research Institute, Xuzhou Hailin slewing ring factory is responsible for drafting, later the country again in 1991 issued a construction machinery standards, JB36.1-36.3-91, in 1999 and 2011 has issued new machinery industry standard JB/2300-1999 and JB/2300-2011 .

The grid division of thin section angular contact bearings

  In carries on the grid division of thin section angular contact ball crossed roller bearings , the possible contact parts need unit size control slewing gear , using 5 units of the adjacent node distance of different mesh. Finite element model graph after mesh partitioning as follows.

Simplified model of thin section angular contact bearings

The simplified model adopt for 2 ball contact model, the smaller ball diameter size is 3.175mm, and the actual cross roller bearings steel ball size consistent in size.

  Larger ball thin section bearings diameter  size is 10mm. load is simplified as concentrated load, effect of point in the ball at the top of the center, the size of the load is 100N, so it can calculate 0 ~ 100N contact size and contact stress of bearing beyond load effect .

  The ball material is 9Cr18 stainless steel. In order to reduce the analysis time and improve the efficiency of analysis, the ANSYS analysis method was used to analyze the axial symmetry.

Grid density of bearing model

From the static analysis, accuracy of  thin section angular contact  bearing's analysis resultsand  has a direct relationship with grid density.

  If the grid is too sparse,the error analysis results will be greater. Too close greatly increases the computational analysis of time.

  Before build the finite element model of miniature linear bearings ,we should adopt a simplified model for determining the density of grid ,then carry on the grid division of the bearing model by the determined grid density.

Finite element analysis of thin section angular contact bearings

For multi body contact deformation in coordination of thin section angular contact bearings's stiffness analysis , the axial stiffness characteristics research  take 71718 bearing as an example of the thin section angular contact bearings.

  According to the impact of unit size on the analysis results to determine the reasonable size of unit.

  Use the determined cell size to establish three-dimensional finite element model of 71718 bearings , and analyse the axial stiffness.

  Build the bearing axial stiffness testing platform,  using for the test of the 71718 axial stiffness.

  The comparison of the experimental results and the  analytical results shows  , using Hertz analytical solution calculation with larger error , the solution obtained by the finite element method with the actual test results within an error of 10%.

The bearing stiffness and bearing preload force

Under axial load, radial displacement of the bearing ring of thin section angular contact bearing is not negligible, but based on the contact analysis of Hertz theory does not consider these factors.

  With the development of CAE technology, finite element analysis technique is widely used in the bearing, and has a relatively high accuracy.

  As everyone knows,the pretightening force of reasonable bearing design can not only to improve the turning precision bearings and reduce vibration and noise, but also can prolong the working life of bearing. the bearing rigidity is an important basis for bearing preload selection.

Hypothesises on the basic theory of Hertz contact theory

In recent years, with the development of the equipment manufacturing industry, light thin wall bearing plays a more and more important role, especially in the application of aerospace field.

  Hertz  contact theory is a classical solution, what can solve most problems of the rolling bearing stress, the strain.

  Using Hertz theory for bearing contact analysis ,we need to make the following a few basic assumptions.

• the contact body material shall be homogeneous and isotropic.

• load vertical perpendicular to  the contact surface, that is to say the     contact surface is a smooth surface, where only the normal force exist, tangential friction does not.

• contact body is linear elastic body, obey the generalized Hooke law.

• compared to the radius of curvature of the contact surface of the object,the contact surface size is small.

  Therefore, Hertz theory usually used to solve the contact problems of the more regular contact body shape and the relatively simple boundary conditions.

Waffle radial sliding bearing

Radial sliding bearing has three kinds of typical structure, respectively is the waffle radial sliding bearing, the radial sliding bearing and  self-aligning radial sliding bearing.

  Waffle sliding bearing is composed of a bearing seat,  bearing cover, split bearing and stud etc.. Subdivision surface often artist stepped, in order to prevent lateral dislocation of neutralization. The bearing cover is arranged at the upper part of the threaded hole, for the installation of the oil cup. Bush is split, usually loaded by the lower bearing shell bearing .

  In order to save precious metals or other needs, often cast a layer of bearing liner  on the inner surface of  the bush . In the bearing inner wall of non load bearing area open oil tank.Oil through the oil hole and an oil slot into the bearing clearance.

  Bearing section  and the load direction had better approximately vertical,though most bearing subdivision surface is horizontal (also made into inclined).

 

Waffle radial sliding bearing assembly and disassembly is convenient, and the bearing wear can adjust bearing clearance with the gasket thickness of reducing the split surface .

Lubricated bearings

Commonly used lubricants have oil, water, air and other fluids and graphite, MoS2 Solid, according to the applications and requirements of bearing . Using liquid as radial bearing lubricant lubrication film thickness according to the divided into thin film lubrication bearing and thick film lubrication bearing.

  In the thick film lubrication bearing according to the formation mechanism of thick film is divided into liquid dynamic pressure radial bearing and the liquid static pressure radial bearing.

What manufacture bearing bush?

Bearing bush  reduced with manufacturing of friction good sliding bearing materials, including metal material,such as copper alloy, aluminum alloy and Babbitt.And non metal materials ,such as plastics, graphite, rubber and wood.

  Some antifriction metal material strength is low ,such as Babbitt. Cast a layer only in the bearing surface of materials with higher strength,which called bearing lining. Support bearing lining part called bearing backing, used to be made by mild steel, cast iron or bronze.

  In order to further improve the bearing lining surface properties, plate a thin layer of metal  on the surface of reducing friction of the better ,such as indium.

  It is composed of different  multilayer metal material  called multi-layer metal bush. Bearing inner hole shape is basically not affected by the shape of the bearing seat hole called thick walled bearing.

  Inner hole shape depends mainly on the bearing seat hole shape called a thin wall bearing bush. Thin wall bearing is widely used in the machine of internal combustion engine, air compressor with mass production.

Four structure types of radial sliding bearing

Radial sliding bearing can divided into splittype, integral type, flange type ,self position type and other types.

  Bearing split bearing cover can be opened, so as to be loaded axle neck, bearing wear for easy adjustment of the bearing clearance. Integral type bearing  has simple structure, but must be loaded from one end of the shaft neck, unable to adjust the gap after wear.

  Flange bearing mounting surface is perpendicular to the bearing center line.Self position type bearing can automatically adjust the axis, in order to adapt to the deformation of shaft deflection.

  Radial sliding bearing bore diameter called bearing diameter. The axial size of Bush called bearing width. The width of bearing and bearing diameter is called
Width diameter ratio, generally 0.4 ~ 1.5.

  In order to reduce the axial size (such as in an internal combustion engine) ,sometimes taken to 0.25. Width diameter ratio on the bearing performance have a great effect.

Specific bearing,how to control.

In today’s world, product traceability is extremely important.In order to satisfy these requirements, requesting a Specification Control Drawing for a slim ball bearing,which is a valuable option to consider.

  A specification control drawing provides the user a concise description of the important bearing feature and parameters for a specific bearing.A specification
control drawing request will generate a unique part number for the standard bearing,including the commercially available options you have selected.

  This provides the customer quick and easy identification of product in the field as well as a concise receiving and inspection document for the factory.