wind power bearing Bearing grinding

Bearing grinding: grinding stainless steel material selection method and technical points

Because of some manufacturers of special requirements, Luoyang Boying bearing production cross roller bearings and YRT turntable bearing needs to use the stainless steel wind power bearing‍ material, the need to do not with ordinary high carbon chromium bearing steel grinding, the grinding requirements of stainless steel material are introduced.

1..... Abrasive: white corundum with cutting performance and word sharp good, suitable for grinding martensite and martensitic and ferritic stainless steel; single crystal corundum abrasives suitable for austenitic and austenitic and ferritic stainless steel; microcrystalline corundum abrasive self aligning ball bearing‍ is composed of many small crystals, high strength, toughness and self sharpening good,

The self sharpening characteristics is the gap along the microcrystalline broken column, so as to obtain micro toughness

And micro edge higher, can reduce the burn, hacking and other phenomena, and can reduce the grinding surface roughness, suitable for grinding various stainless steel; cubic boron bearing‍ nitride abrasive high hardness, good thermal stability, high chemical inert, 1300 ℃ ~ 1500 ℃ no oxidation, abrasive blade tip is not easy to blunt, grinding heat is small, suitable for grinding various kinds of stainless steel, in order to reduce the adhesion phenomenon, also can use silicon carbide.     

wheel bearing often occurred in winter

C. for only the radial load and the radial clearance is large but also easy to produce.

D. also can be in a certain range and different size bearing its speed range are also different.

E. may be a continuous sound may wheel bearing‍  be intermittent sound.

F. the forced vibration often excited outer two order, three order bending vibration, thus make the noise. Through the use of pre load equation method can effectively reduce the noise, reduce the installed bearing radial clearance, choose good lubricants can also improve, some foreign enterprises adopt light rolling body, such as ceramic roller or hollow roller and other technical measures to prevent the occurrence of such noise.

The 3 tip.

It is a metal sliding friction high precision bearings‍ produced quite sharp scream, though bearing temperature rise is not high, it will not have much impact on the service life of the bearing and grease life, does not affect the rotation, but not melodious sound disturbing, especially bear radial load of large cylindrical roller bearings often have this noise, the characteristics of:

A. bearing radial clearance large easy to produce.

B. usually occurs in grease lubrication, oil lubrication is rare.

C. decreases with the bearing size increases, Slewing drives‍ and often appears in a certain speed range.

D. winter often.

E. its appearance is irregular, and unpredictable, and associated with the installation of operating conditions and performance, filling grease amount. This noise can be used to reduce the bearing radial clearance and the shallow outer ring raceway structure to prevent.‍

wind power bearing fall rolling sound

The noise in general, mostly large bearings at low speeds and bear radial load. When the operation of the bearing in the radial load, load and non load bearing, wind power bearing‍ if the bearing has a radial clearance, the non load area of the rolling body and the inner raceway no contact, but because of the action of centrifugal force may be associated with the outer ring contact, therefore, at low speeds, the centrifugal force is less than when rolling body weight when the natural vibration and noise, the rolling of the fall and and inner raceway or cage collision and motivate the bearing, Flange Slewing Bearing‍ and has the following characteristics:

Easy to produce A. grease lubrication, oil lubrication is not easy to produce. When use inferior lubricating grease are more susceptible to.                                                                                                                                                                               ‍

LYHY deck crane bearing raceway acoustic

Rolling road sound is due to rotation of the bearing rolling body raceway rolling in and create a smooth and continuous noise, only when the sound pressure level or tone greatly when attention. In fact, the rolling sound excited acoustic energy is limited, such as in the normal condition, the quality of the 6203 bearing raceway acoustic ranged from 25 to 27dB. Single row deep groove ball bearing this noise to bear radial load as the most typical, it has the following characteristics:

A. noise, vibration is random;

B. vibration frequencies deck crane bearing‍ above 1kHz;

C. No matter how changes in speed, noise frequency and sound pressure level is almost the same with the speed increase;

D. when the radial clearance increases, the sound pressure level increases sharply;

Rigid E. bearing increases, the lower the total sound pressure level, even if the speed increased, the overall sound pressure level increases slightly;

F. lubricant viscosity bearing‍ is high, the sound pressure level is low, but for grease lubrication, the shape and size of the viscosity, the soap fiber can affect the value of the noise.

Rolling road sound source is the inherent vibration caused by load ring after. Due to the elastic contact rings and rolling elements of nonlinear vibration system. When the lubrication Angular contact ball bearings‍ or machining precision is not high it will inspire the vibration associated with the elastic characteristics, transfer into the air into a noise. As everyone knows, even using the modern technology of manufacturing the highest machining bearing parts, its work surface there are tiny geometric error is not a degree, so that the raceway and rolling body produce tiny wave excitation vibration vibration system. Although it is inevitable, however, can adopt high precision machining parts work surface, the correct selection of denoising bearing and precise use of the bearing so that the damping.

wheel bearing bearing arrangement includes

The bearing arrangement includes not only the rolling bearing, but also with the bearing components related, such as the shaft and the bearing seat. A very important part of the lubricant is also bearing configuration, as lubricants to corrosion abrasion proof, so that the bearing can give full play to the role of. In addition, the seal is also a very important component, the seal performance is very important for lubricant clean, ferris wheel bearing ‍keep clean the bearing service life have a profound impact.

In order to design of rolling bearing configuration, need

– select the suitable bearing type and

Determine the appropriate size of the - bearing,

But this is not enough. There are several other aspects to consider:

- such as the other parts deck crane bearing‍ of the bearing arrangement proper form and design,

- correct fit and bearing internal clearance or preload,

- fixed device,

Seal - proper,

The type and dosage, lubricant, and

- installation and removal methods.

Each individual will affect the performance, reliability and economy of the bearing arrangement.

Work required depends on whether similar bearing matching experienced. In case of lack of experience, there are special requirements, or the need for self aligning bearing‍ bearing configuration cost and any other subsequent appearance to give special consideration, we need to do more work, such as a more accurate calculation or test.

Selection and application of bearing‍

The reason of corrosion rust wind power bearing

wind power bearing corrosion is very common, it would reduce the service life of bearing. So everyone in daily work must pay attention to this problem.

Determine the cause and prevention method of high temperature bearing corrosion, first look at the high temperature bearing corrosion is caused by what, generally divided into external and internal. Sum up the main:

1 metal surface finish (oxygen concentration difference cell corrosion).

The 2 metal material chemical composition and structure.

Solution composition and pH 3 in contact with the metal surface value.

4 the environment temperature and humidity.

5 and all kinds of environment medium metal surface contact.

6 other people sweat also cause bearing corrosion, its pH value is 5~6. So in order to prevent corrosion caused by hand sweat, installation and production personnel should wear gloves, don't contact with high temperature Spherical roller bearings hand lightly.

The reasons and measures of wheel bearing the delamination damage

The reason of the delamination damage wheel bearing :
1, excessive load
2, poor installation (non linear), torque load, foreign intrusion, water.
3, poor lubrication, lubricant inappropriate bearing clearance is not appropriate.
4, the accuracy of bearing box is not good, the rigidity of bearing box uneven shaft deflection
5, rust, corrosion, abrasion and indentation (surface deformation) causes the development.
Guide roller, guide, slider, linear bearings, miniature ball bearings series of deep groove ball bearing series needle roller  bearings, thrust ball bearings
What measures to take to solve the peeling of bearings damage:
1, check the load size and Double Row Ball Slewing Bearing again using the Institute
2, improve the installation method, improved sealing device, shutdown protection.
3, the use of appropriate viscosity lubricant, improve lubrication method.
4, check the accuracy of the shaft and housing
5, check the clearance.

Maintenance of the deck crane bearing

Remove deck crane bearing overhaul, the first records bearing appearance, confirm the remaining amount of lubricant, after sampling inspection by the lubricant, cleaning bearings. As a cleaning agent, general use gasoline, kerosene.
Removed bearing cleaning, cleaning rough and fine washing, respectively in the container, metal mesh on the bottom first, make the bearing does not directly contact the container dirt. Rough cleaning, if you rotate the bearings with dirt, can damage the bearing rolling surface, should pay attention to. In the crude oil washing, use the brush to remove grease, adhesive material, generally after a clean, to wash.
Sperm washing, cleaning of oil bearing is in while rotating, while carefully cleaned. In addition, cleaning oil should be kept clean.
Dismantled in order to determine the bearing can then use, should check the slewing ring bearings cleaned, carefully check the raceway surface, rolling surface, with the surface state, maintain and increase shelf wear, bearing clearance and non dimensional accuracy on the decline in injury, abnormal. Non separation of small ball bearings, inner ring with one hand supporting level, to confirm whether the smooth rotating ring.
Bearing separation type bearings, can check on the raceway surface rolling body, the outer ring, because large bearing cannot rotate with the hand, pay attention to check the rolling, raceway, cage, retaining boundary surface appearance, Crossed Roller Slewing Bearing shall carefully check the higher importance.
Large machinery can not be manually rotated, so the no-load starting immediately after power cut, mechanical idling, check whether the vibration, noise, rotating parts are in contact and so on, confirmed no abnormal, into the dynamic operation.
Power operation, from the no-load speed, slowly increased to the rated operating condition. Test run of issues, whether there is abnormal sound, bearing temperature, lubricant leakage or discoloration etc.. If abnormal, should immediately suspend the operation, inspection machine, necessary to remove the bearing inspection.

The effect of bearing

The effect that should be supported, namely literal interpretation to the bearing, but this is only a part of its roles, supporting its essence is to bear radial load. Can also be understood as it is for a fixed shaft. Is the only fixed axial bearing rotation, moving to control the axial and radial. Motor without bearing the consequences that would not work at all. Because the shaft can move in any direction, and the motor work requirements can only rotate axis. Impossible to achieve the transmission function, speaking theoretically not only so, bearing will affect the transmission, in order to reduce deck crane bearing the influence to achieve good lubricating the bearings on the high speed shaft, the bearing itself has lubrication, called pre lubricated bearings, and most of the bearings must be responsible for lubricating oil, when running at high speed, because of friction will increase energy consumption, more terrible is easy to damage the bearing. The sliding friction into the rolling friction is one-sided, because there is something called sliding bearing.

Agricultural bearings selection issues to consider

In the choice of the general bearing support to those problems? You can try the following four steps to consider:

How to define the axis position, including radial and axial position is the first thing to consider. General axis adopts double support structure, the radial position of the shaft joint is defined by the two support, centripetal or angular contact bearing supports radial location of each i effect. Axial displacement axial displacement axial position may be composed of two supporting the limit in one direction can be limited in two directions by a bearing, in general, the axial positioning in different ways can get different running accuracy. Therefore, the design of supporting structure should be based on the axis of the operation accuracy and working conditions, practical scheme of axial positioning.

At the same time bear radial load and axial load case, supporting often use mounting angular contact bearings and tapered roller bearings are. Angular contact bearings installed in pairs arranged in one of three ways. Two bearing outer ring width end relative installation called back-to-back mounting method. The two support force on self aligning bearing bearing span beyond. This arrangement for supporting span large, good steel shaft cantilever, axial thermal elongation, the outer ring is disengaged from the inner trend, so the shaft without jamming, so widely used. But if the pre installed in the shaft when heated, pre tension will be reduced. Two bearing outer ring narrow end relative installation called face to face mounting. The force point two support falls on the supporting span. This arrangement has the advantages of simple structure, installation, debugging convenient and therefore are more widely used, mainly for short axis and the temperature rise is not high, but it should be noted that we must have a spare clearance. The axial clearance also should not be too big, will reduce the running accuracy of the shaft. When the axial load is larger, the need for multiple bearings and bearing, agricultural bearings outer ring width is often used, narrow face relative installation series. Effect of the bearing force are located on the same side of the bearing are arranged in the same direction is also called series. The arrangement of this to the attention of the structure and manufacture to ensure each bearing can be as much as possible uniform load.

The machine is in operation, the general spindle or drive shaft temperature higher than the adjacent parts of the temperature, so the shaft will heat up elongation. In order to keep the shaft to rotate flexibly, in supporting structure design, while meeting the axial positioning accuracy requirements, but also consider the axial heat free expansion requirements. Axial positioning and axial expansion way is the corresponding.‍

The rotary support bearings

Turntable bearing its technology in the field of thrust roller bearing  in the first-class product is famous in the world. These mechanical components has been repeatedly proved its high load capacity, wide range of application and high cost benefit. Due to their design, a single bearing can support the radial, axial and oblique bending load. Therefore, in many cases, the bearing arrangement which can be replaced by the single bearing assembly into a radial and axial bearing. In many cases, it is largely in the adjacent structure design and bearing installation decreases the need for cost and effort. Wheel bearing double sealed, lubricated by grease of high quality, can through the lubricating nozzle re lubrication and easy to install. thrust ball bearing ring provides no gear, or bearing to achieve simple drive and provided with external or internal gear.

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The speed limit of angular contact ball bearing

Angular contact ball bearing speed increased restrictions is mainly because of the angular contact ball high speed bearing friction fever induced by internal temperature, when thespeed reaches a certain value, due to burn and cause cannot continue rotatingangular contact ball bearing. The speed limit of angular contact ball spindle bearing‍ is the frictional heating does not cause burns and continuous rotation of the boundaryvalues.

Therefore, angular contact ball bearing limit speed depends on the angular contact ball bearing type, size and accuracy and lubrication, lubricant quality, cage and type of material, loading conditions and other factors. All kinds of angular contact ball bearingswith grease lubrication and oil lubrication (oil bath lubrication) speed limit when contained in the angular contact ball bearing size table, its numerical representation standards for the design of the angular contact ball bearing under general loading conditions (C/P>=13, Fa/Fr<=0.25) limits when the rotation speed value.‍

What is the angular contact ball bearing

Angular contact ball bearings, thrust ball bearings to the heart that is usually said, the allowable working speed and deep groove ball bearing is similar, but the support rigidity ratio of deep groove ball bearing is stronger, mainly because of the bearingsteel ball is more, the radial load capacity than the ordinary ball bearing, but also bear large axial load or subject to pure axial load. The bearings are generally used in pairs,used for Small Span Rigid double supporting shaft or precision spindle, can improve the rigidity of the bearing system.

Can bear radial load and axial load for angular contact ball bearing. Can work at a higher speed. The larger the contact angle, the higher the axial bearing capacity. High precision and high speed bearings usually take 15 degrees contact angle. Under the action of axial force, contact angle increases. The axial load of single row angular contact ball bearings can bear a direction, in radial load, will cause additional axial force. The axial displacement of the bearing can limit shaft or shell in one direction. If quality.the installation, the outer ring of a bearing on the relative, the wide end of the wide face, narrow end face with narrow end. So to avoid the additional axial force, but also in the two direction of the shaft or shell limit in the axial clearance range.

Because of its inner and outer ring raceway can have relative displacement on the horizontal axis angular contact ball bearing, can bear radial load and axial load --combined load (single row angular contact ball bearings can only endure single direction axial load, mounting is often adopted to them).‍

Bearings

On the supporting part of the machine, in order to prevent the tapered bearing inner ring and shaft, the outer ring and shell hole relative slip occurred in the operation of the machine, must choose the right fit. A small amount of interference, will cause withsliding, lead to wear, damage to the shaft or housing surface, wear powder into the thin section bearing internal, will cause vibration and heating, and cause failure. The amount of interference is too large, will cause the bearing clearance work greatly reduced or completely disappeared, normal operation so as to affect the bearing or prematurefailure.

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