agricultural bearings Turntable bearing load on the effects of using precision

To maintain a good state of bearing and the use of performance, maintenance, repair, in order to prevent accidents, ensuring the reliability of operation, increase production, economy. To maintain the best operating conditions of the corresponding mechanical operating standards, regular agricultural bearings‍ inspections to maintain in good condition and performance of bearings, maintenance, overhaul, in order to prevent accidents, ensuring the reliability of operation, increase production, economy. To maintain the best operating conditions of the corresponding mechanical operation standard, check regularly. Examination content includes monitoring Single Row Ball Slewing Bearing‍ running state, supplement or replacement of the lubricant, periodic disassembly inspection. As a matter of maintenance in operation, a rotary voice, YRT turntable bearing vibration, temperature, the state of grease and so on. Remove bearing overhaul, the first recorded appearance of the bearings, Slewing drives‍ confirm the remaining amount of lubricant, after sampling inspection by the lubricant, cleaning bearings.

On the basis of efficiency for turntable bearing load on the rotation of the ferrule, working condition, the load ring bear is divided into a fixed load, dynamic load and rocking out load three.‍

precision spindle bearings size and Bond

size: grinding stainless steel, general grinding wheel with No. 36, No. 46, No. 60 middle size is appropriate, the coarse grinding, the No. 36, No. 46 grain size, precision spindle bearings‍ with 60 grit grinding. In order to be used for coarse grinding and fine grinding, the No. 46 and No. 60 grain size.

Bond: grinding stainless steel wheel has high strength, in order to bear a larger impact load. Vitrified heat-resistant, resistant to corrosion, wheel it made can keep good cutting reali slim bearings‍ performance, moisture resistance, porous, binder for making grinding stainless steel wheel. Grinding tolerance

Concentrated nitric acid stainless steel inner hole, the resin bond grinding wheel manufacturing.                                                              ‍

marine crane 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 material, the need to do not with ordinary high carbon chromium bearing steel grinding, the grinding requirements of stainless marine crane bearing‍ 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 is composed of many small crystals, high strength, toughness and self sharpening good,

The self sharpening slewing bearing‍ 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 Thin section bearings‍ 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 and diamond abrasive wheel.

agricultural bearings Abnormal phenomenon of bearing

Metal noise

Reason 1: abnormal load, countermeasures: modified with research, bearing clearance, adjustment and load, correction shell shoulder position.

Reason 2: poor installation, countermeasure: the processing precision of the shaft, housing, improve the installation accuracy, installation method.

3 reasons: lack of agricultural bearings‍ lubricant or not suitable, countermeasures: add lubricant, select the appropriate lubricant.

Reason 4: the rotating parts in contact, countermeasures: modify curve sealing contact part.

Regular noise

Reason 1: the foreign bodies caused by rolling surface indentation, rust or scars, countermeasure: the replacement of bearings, wash the parts, improve sealing device, the use of clean lubricant.

Reasons: (2 Steel Carburized) surface deformation, countermeasure: the replacement of bearings, pay attention to the use of.

Reason 3: the wind power bearing‍ raceway surface peeling, countermeasures: replacement of bearings.

Irregular noise

Reason 1: the clearance is too large, countermeasures: research cooperation and bearing clearance, modify the pre load.

Reason 2: foreign intrusion, countermeasures: a study of replacement thin section bearing‍ of bearings, wash the parts, improve sealing device, the use of clean lubricant.

Reason 3: spherical injury, peeling, countermeasures: replacement of bearings.‍

Wear failure of marine crane bearing

Wear failure is one of the common failure mode of marine crane bearing , according to wear form is usually divided into the abrasive wear and adhesive wear the most common.
First of all, reasonable structure design of both have advanced, there will be a longer marine crane bearing  life. Manufacture of bearings are generally after forging, heat treatment, machining, grinding and assembling multi-channel processes. Rationality, advanced processing technology, the stability will also affect the service life of bearing. The effect of heat treatment and grinding process quality of finished double direction thrust ball bearing, often has a more direct relationship with the bearing failure. Bearing in recent years research on bearing surface modification layer of work shows that, the relationship between grinding and surface quality of bearing close.
The metallurgical quality of bearing materials is the main factor affecting the early failure of rolling bearings once. With the metallurgical technology (such as vacuum degassing of steel bearing) progress, improved quality of raw materials. Raw materials quality factors has been a marked decline in the proportion of Flange Slewing Bearing failure analysis, bearing, but it is still one of the main factors of bearing failure.

Three major factors of agricultural bearings failure

1 contact fatigue failure
Contact fatigue failure refers to the agricultural bearings  surface subjected to alternating stress arising from failure. Contact fatigue spalling in sliding bearing surface, often accompanied by fatigue crack, first from the contact surface following the largest alternating shear stress, and then extended to the surface spalling of different shapes, such as point to point pitting or pitting spalling, shallow spalling in the peel into small flakes. Due to the peeling surface gradually expanded, and often deep extended, forming deep spalling. Deep contact fatigue failure fatigue spalling is source of.
 2 clearance change
Bearing in the work, due to the impact of external or Thrust Roller Bearings
  internal factors, so that the original clearance change, accuracy, and even cause "killed" called the clearance change failure. External factors such as excessive interference, the installation is not in place, the temperature rise caused by the expansion of the quantity, instantaneous overload, internal factors such as residual austenite and residual stress in an unstable state, is the main reason that causes the failure of the clearance change.
3, the wear failure
Wear failure refers to the failure of the relative sliding friction between the surfaces due to the surface of metal wear and the. Continuous wear will cause damage to bearing parts gradually,Full complement cylindrical roller bearing
 and eventually lead to sliding bearing loss of dimensional accuracy and other related issues. Wear may affect the shape change, increased clearance and surface morphology changes, may affect the lubricant or its pollution to a certain extent and cause lubrication complete loss of function, and thus loss of bearing rotation accuracy and can not operate normally.

precision spindle bearings clearance

precision spindle bearings clearance is the inner ring, outer ring, rolling body gap amount between the. That is the inner or outer ring of a fixed amount of the other party, move up and down or left direction. The displacement of radial direction, axial direction, are called the radial clearance, axial clearance.
Selection of bearing clearance, has great influence on the mechanical operation accuracy, service life of the bearing vibration and noise, friction resistance, thin section angular contact bearings etc.. Clearance at the operating temperature of the bearing clearance and mounted before the post (clearance) are different, the axial positioning accuracy, the working clearance should be as small as possible.
Selection of bearing clearance, must fully consider the following several main factors:
1) change with the bearing and the shaft and housing bore tightness will result in bearing clearance value. In general, diffusion tensor bearing inner ring raceway can approximate to the interference fit between the 80%, and the contraction of the outer ring can be roughly constant interference for its 70% (prerequisite: solid steel shaft, steel Angular contact ball bearings wall normal thickness).
2) bearing in operation process, because the radiation condition of the shaft and the housing and different coefficients of expansion, change will lead to clearance value.

Check the bearing in operation

Sound, vibration, temperature, state roll operation inspection items of a bearing, as follows:

One， rolling sound, bearing

The size and quality of the sound of the operation of the slim ball bearing sound check, bearing even a slight separation of the injury, also issued abnormal sound and irregular sound, with sound measuring device can distinguish.

Two, the bearing vibration

Bearing vibration is very sensitive to the bearing damage, such as peeling, indentation, rust, crack, wear will be reflected, in the measurement of bearing vibration so, through the use of special bearing vibration measuring device (frequency analyzer etc) can measure the size of the vibration, the frequency cannot be inferred from abnormal situation. The measured values, and different bearing conditions of use or the sensor installation location, therefore require prior to each machine measurement comparison criteria.

Three, the temperature of the bearing

The temperature of the bearing, general bearing outside of room temperature can be speculated that, if the uses of oil hole can directly measure the temperature of the four point contact ball slewing bearing  outer ring, the more appropriate. Usually, the temperature of the bearing with running slowly rising, reach a steady state after 1-2 hours. The normal temperature of the bearing is due to the heat capacity, the machine heat dissipating capacity, speed and load and different. If the lubrication, install appropriate, bearing temperature will rise rapidly, there will be abnormal high temperature, then we must stop, take the necessary preventive measures. Based on a large amount of test data, table 4-1 lists the average outer temperature bearing work machinery, for reference. Because of the influence of temperature, speed, load, lubrication environment, the table value represents only the temperature range of. The use of thermal exchanger can always monitor the bearing temperature, and when the temperature exceeds the specified value alarm households or stop to prevent burning shaft accident.‍

And replaced bearing lubricant

A. grease replenishment interval time

Due to mechanical action, aging and pollution, lubricant base filling of the precision spindle bearings ‍ arrangement will gradually lose its lubrication performance. Therefore, the lubrication rank need to supplement and update. Interval lubricant added due to bearing formation, size and speed and different.

In addition, when the temperature exceeds 70 ℃, bearings, bearing temperature rise 15 ℃, then use grease replenishment interval time is reduced by half.

Double sealed bearing in manufacturing has been put into the grease, used in these products is the standard grease, co operating temperature range and other properties suitable for the occasion, and filling grease amount and size of the corresponding bearing, grease life in general can exceed the bearing life, except for special occasions, do not need to add grease.

B. ‍The replacement cycle lubricating oil

The replacement cycle lubricating oil because of the different conditions of use and the amount of oil, under normal circumstances, in the operation temperature is 50 ℃, the use of good environment less dust condition, once a year, when the temperature reached 100 ℃, 3 months or less a replacement.‍

The performance of roller bearing, long life

Non locating bearing roller bearing used in vibration. Them to press fit mounted to the shaft, eliminating the friction corrosion which may be caused by axial clearance is not tight, self-aligning bearing system can also be formed with good performance and reliability.

Toroidal roller bearings can performance structure with smaller and lighter to achieve the same or better, for example in the planetary gear box. They simplify the bearing arrangement on the longitudinal axis of the larger temperature change. The use of this kind of bearing vibration are reduced, for example in the paper machine and fan. It is a long and slightly single row bearings symmetrical roller coronary. inch bearing inner and outer ring raceway are concave in shape, around the bearing center symmetric distribution. Thus the best combination of raceway characteristics, load distribution in favor of bearings to reduce friction. Roller bearing with self-directed, regardless of whether the inner ring relative to the outer ring axial displacement and / or misalignment, roller is always in a uniform load distribution on the roller length position. It's a very strong load capacity, even in has to compensate for angular misalignment or axial displacement. So, bearing layout in the operation is reliable, extended service life.

Selection and application of bearing

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, 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 spherical bearings

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

- such as the other parts 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 flange bearing matching experienced. In case of lack of experience, there are special requirements, or the need for 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.

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