A special bearing-Agricultural Bearings

We are a professional bearing manufacturer in the world. Established in 2000, has been specializing in bearings' design, production, sales, marketing and service. For 13 years experiences, our bearings have flied to USA, Europe, Middle East, Asia and Africa.Today introduced a special bearing-Agricultural Bearing is widely used in special sealed bearing on the domestic and foreign agricultural machinery. It is based disc plow, disc harrows and other farming machinery transfer load, farming in muddy water easily enters the bearing, the working shaft Equidistant installation (harrow plow shaft or axis) on multiple sets of bearings and other characteristics, designed a good sealing performance, good aligning performance, large carrying capacity, easy installation and removal of the bearings.

High performance development of precision spindle bearings

Mr. Ye Jun said that, as a key basic parts, machine tool precision spindle bearings are the foundation to guarantee the machining accuracy index of machine tool. With the development of modern machine tools to the development of high precision, high speed, high reliability direction, put forward higher request to the spindle bearings.

  As in the traditional mechanical or general machinery, mainly in the hundreds to thousands of speed r / min/ agricultural bearings , while the modern high-speed processing machine, spindle speed required to reach tens of thousands to ten revolutions per minute. In the bearing industry, said the speed performance with dmN value, it is a product of the diameter and the speed of the machine tool spindle, the index is generally less than 2 million, the highest of 4 million, require very high.

  Therefore, bearing on the design requirements, with angular contact ball bearing as an example,marine crane bearing from material selection, structure design, guide way design, lubrication, groove curvature coefficient selection and other aspects needed for spindle requirements analysis, research.

Stringent requirements for precision bearings under the development of high speed spindle

High speed spindle bearing is particularly important, especially in order to meet the increasing requirement of processing speed, the development of high speed bearing spindle including electric spindle, and continuous improvement, more and the requirement of high speed of spindle bearing higher.

  If the agricultural bearings are not good,it will be very serious rise of spindle system temperature, and even burned failure.

TAC series of precision spindle bearing material

TAC series bearing（precision spindle bearings） of this brand are made of EP steel, the outstanding characteristic of having long life. EP steel NSK development with the characteristics of high purity, long life, high reliability, the rolling contact fatigue life is 3 times the average of SUJ2 bearing steel.

  LYHY agricultural bearings have been done in this area a lot of effort.TAC series of bearings adopt high dustproof light contact sealing ring, improve the reliability of. TAC series of marine crane bearing with light contact their independent development of the sealing ring is excellent, high speed, small temperature rise, high reliability.

TAC series of precision spindle bearing specialty

1.high performance design.

High Rigidity, ball number 600, contact angle, high stiffness.
Long Life, with EP steel long life, high reliability, service life is 3 times that of ordinary bearing( precision spindle bearings ) steel SUJ2.

2.
Contact sealed bearing series, high reliability, high dust
Sealed bearing dustproof performance is good, not easy leakage of lubricating grease. And the use of light contact seal ring,low bearing torque and fever.

3.installation convenience( marine crane bearing )

Open Bearing,provide has been filling grease products, shorten the installation time.

Sealed Bearing, has been filled with grease, and the back and front of the sealing rings of different colors, easy to identify the direction .

  Ball screw support contact ball bearing type series for thrust angle, sealed bearing series.

TAC series of precision spindle bearing

TAC series of bearings is  the ball screw support angular contact thrust ball bearing（ angular contact ball bearing ） under a brand of LYHY marine crane bearing peer , TAC series of bearings （agricultural bearings） include open bearing series, sealed bearing series.

TAC series  ball screw special bearing with high rigidity, high performance
and model complete, a wide range of uses,increase the sealing type series.

The spindle bearing parameter results

• Operation performance is better than that of ceramic ball bearing has the advantages of full steel bearing, the positioning preload more fully embodied, the speed limit of all steel bearings and ceramic ball bearing 4; n value, positioning preload were 1 X10 and 6.4 XIO 'bucket', fixed pressure preload were 2.4 XIO 'XIO', and 3.4 fixed pressure preload, ceramic ball bearing stiffness is greater than all steel bearings, and the positioning of preload on the contrary.

• In general, the angular contact ball bearings inner ring of the highest temperature, lowest temperature, the outer ring, but the constant preload - Factory rotate speed reaches to a certain value, the temperature may be higher than the inner ring outer ring.

• Measurement of  precision spindle bearings translational inherent frequency and the radial stiffness value and calculated value is consistent, ignore W1) d influence the measurement value is less than the calculated value, indicates that the theoretical analysis is correct. 

Experimental verification of spindle bearing

Through the theoretical analysis of spindle bearing , the results show that,

1) friction heat and pre tightening mode influence the speed and the dynamic performance of the bearing is very significant, bearing the quasi dynamic analysis to consider the friction heat and pretension.

  Methods influence the accuracy of computation is improved obviously, the results accord with the actual, friction heat and inertia effect of high speed increases the speed reduction bearing.
  And the dynamic performance of fixed pressure preload, the influence is less than positioning pretension, speed performance is better than the positioning pretension, preload for high speed.

2) using single flange bearing outer ring structure of low temperature than a double wall temperature, effect of ball number on the bearing temperature is small, the ball diameter and the initial contact angle increases raising the temperature, compared the positioning preload, fixed pressure preload more obvious; two pre tightening mode, ball diameter increases and the increase of the number of the linear ball bearing stiffness,effect of ball number increases, more than the ball diameter, the radial stiffness decreased the initial contact angle increases, the axial and angular stiffness increases, but the fixed pressure
preload, the axial and angular diameter increased stiffness decreases with increasing the initial contact angle can improve the axial and angular stiffness.

Spindle bearing relevant study

• Bearing stiffness analysis and measurement, application of Hertz contact theory, establish the formulations for calculating the stiffness of precision spindle bearings, bearing stiffness characteristic analysis and example calculation, measurement and processing computer system of vibration, vibration feature extraction of signals, the measurement of the stiffness of the bearing.

• Dynamics analysis of spindle units,according to the theory of vibration, the application of the finite difference method and the finite element method, the dynamic characteristics of spindle slewing drives is analyzed, and an example of calculation.

• To calculate the minimum preload, put forward the minimum preload bearing calculation criteria, and an example of calculation.

• Bearing speed experimental study, effects of test to bearing structure and lubrication parameters on the performance of speed.

Study on the thermal characteristics of spindle bearings

The friction heat of spindle bearings significantly influence the speed and the dynamic performance of the precision spindle bearings unit, is restricting the main factors to improve the machining efficiency and precision.

  To build up the heat transfer equations, the friction heat and temperature distribution calculation of bearing, thermal characteristics research of bearing, and its impact on the speed and dynamics is an important topic with theoretical
and practical significance.

  In this paper, based on the heat transfer, tribology of spherical roller bearing and rotor dynamics as the theoretical basis,taking the GDZ48A type electric spindle as an example, establishes the spindle bearing considering the effect of friction heat and pre tightening mode quasi dynamics analysis model, analyzes the bearing friction torque, motor, load and stiffness, study the influence of thermal characteristic, agricultural bearings design and application parameters on the speed and dynamics, and validated by experiments.

spindle bearing,gricultural bearings

spindle bearing dynamics performance study  including ,
1) dynamic analysis of pseudo bearing, the establishment of improved quasi dynamics analysis method, considering the effect of friction heat and pre tightening mode, calculation of bearing load, motion, displacement, friction torque and friction heat equation.
2) calculation of bearing temperature distribution, using heat transfer theory, the establishment of the spindle unit of heat transfer model, derives the heat transfer resistance and heat transfer equation.
3) agricultural bearings operation performance calculation, the effects of example calculation and thermal characteristics, analysis of bearing design parameters and Preload Method on operation performance.

The inner ring and shaft coordination

With the inner ring and the shaft, with no interference, no clearance of the state as the target (Line to Line). With the outer ring and the outer shell is movably matched with the hole.
Used in the same inner diameter of the casing in parallel with the double row spherical roller bearing case, outside diameter tolerance is F6, so as to be movable fit.
thrust ball bearing screw support frame for angular contact ball bearing ,as the shaft size tolerances recommended H5 as shell hole size tolerance, recommendation H6
The clearance and preload bearings
Install bearings, applying pre load appropriate to give, as the axial clearance, the regulations are as follows.
Double direction angular contact thrust ball bearing--C7 clearance
Thrust ball screw support frame for angular contact ball bearing --C10clearance

The third result of theoretical analysis of spindle bearings

The preload increases the temperature of the bearing and the stiffness will increase slightly, the fixed pressure preload, preload should increase with the rotational speed, the  marine crane bearing load and torque increases, positioning preload, the ambient temperature is high, the temperature rise of Vietnam, fixed pressure preload on the contrary.

  Oil mist lubrication, lubricating oil supply dose effect and viscosity and gas pressure bearing temperature, lubricating properties of synthetic lubricating oil is better than mineral oil, mineral oil contains a small amount of synthetic oil lubrication performance is best, can improve the speed performance of the precision spindle bearings the correct application of parameter selection.

Spindle bearing configuration

  The correct configuration of spindle bearings is a combination of front and back bearing and bearing type layout, different configuration determines the different load capacity, machine tool spindle angular contact ball bearings, rigidity, temperature rise and the service life, especially the influence of stiffness and temperature rise is more obvious, so we should according to the work characteristic of machine tools the requirements of rational allocation of main shaft bearings.

Double direction angular contact thrust ball bearing

Range: diameter 80 mm to 600mm diameter

Precision: UP, SP, P4, P5

Dimension series: BS1747TN1 BS2047TN1

BS2562TN1 BS3062TN1

30TAC62BSUC10PN7B.

Nominal bearing contact angle of 60 degrees.

The bearing assembly preload.

High rotation accuracy

precision bearings for machine tool spindle

Spindle bearing characteristics

Slim bearing is the main shaft bearing of precision machine tools and similar equipment, to ensure the accuracy of its work and the use of performance of precision machine tool.

  Taking the NSK spindle bearing products in Japan as an example, precision spindle bearings include precision angular contact ball bearing 70 series, 719 series, 72 series, precision round The column roller bearing N10 series, NN30 series, TAC series of bearings for precision ball screw support.

Spindle bearing characteristics

High performance design.

High rigidity, Ball Number 600, contact angle, high stiffness.

Long life,EP steel with long life, high reliability, service life is 3 times that of ordinary bearing steel SUJ2.

Contact sealed bearing series,high reliability, high dust

Sealed bearing dustproof performance is good, not easy leakage of lubricating grease. And the use of light contact seal ring, bearing torque low, low fever.

Advantages and characteristics of precision spindle bearings

The spindle bearing is the main shaft bearing of precision machine tools and similar equipment, to ensure the accuracy of its work and the use of performance of precision machine tool.

  Taking the NSK spindle bearing products in Japan as an example, precision spindle bearings include precision angular contact ball bearing 70 series, 719 series, 72 series, precision round
The column roller bearing N10 series, NN30 series, TAC series of bearings for precision ball screw support.

• Spindle bearing characteristics
• High performance design.

High rigidity, Ball Number 600, contact angle, high stiffness.
Long life, EP steel with long life, high reliability, service life is 3 times that of ordinary bearing steel SUJ2.

• Contact sealed bearing series, high reliability, high dustSealed bearing dustproof performance is good, not easy leakage of lubricating grease. And the use of light contact seal ring, bearing torque low, low fever.

Brief introduction of agricultural bearings

Agricultural bearings are special sealed ball bearings which are widely used in the foreign agricultural machinery.

  It is based on the disc plough, disc harrow and other agricultural tillage machinery, farming in the transfer load slurry easy to enter the working shaft bearing inner (Plow harrow shaft or axle) equidistantly installed multi bearing characteristics, specially designed a good sealing performance, good performance in bearing, big self aligning bearing capacity , easy to install and disassemble.

  The structure of agricultural bearings is very special, the inner hole is provided with cylindrical, four square, six square; outside diameter of cylindrical, spherical, cylindrical spherical mixed form. Stamping bearing seat some bearing is also provided with a square hole or a circular hole, the bearing can simplify the host structure, installation, disassembly and easy bearing.

No bearing distance ，no progress.

In the aspect of vibration, noise and abnormal sound. Japan has launched a mute and super mute bearing, while the extreme horizontal vibration China bearing compared with Japan bearing, general is above 10dB.

  In the aspect of life and reliability. Taking the deep groove ball bearing as an example, foreign brand-name products typically live for the life calculation of more than 8 times(highest up to over 30 times), the reliability is above 98% (or pursuit and host life), and Chinese bearing life generally only for the calculation of life expectancy of 3 to 5 times, the reliability is about 96%.

  In the precision of the bearing. Domestic bearing size deviation and rotation accuracy although and imported bearings have been very close, but with the SKF bearing imports also has certain disparity in the discrete degree. Foreign countries have already begun to research and application of "non repeatable runout" rotation accuracy index of such fine, and China research in this area is still a blank.

  In the high speed bearing performance of foreign famous brand products, the DmN value of 4 by 106 mm r/min, and China bearing is only 2 by 106 mm r/min.

  No matter how long the distance is,China is always trying to keep up with the world ,and never stop.Just like LYHY bearing,one part of China bearing.

The purchase of agricultural machinery bearings

Bearing is a supporting member of various mechanical rotating shaft or the movable parts, widely used in agricultural automobile, tractor, diesel engine, motor, agricultural machinery and threshing machine. Purchase bearings bearings commonly used code, but the bearing code more complicated, if agricultural hand recognition bearing code rules, it is easy to buy.

 Precision spindle bearings are some commonly used standard models, code named 0, the tolerance level for the G (ordinary level), the general bearing of the first paragraph can not write, so the code to the basic code of 7 digits, said.

  To illustrate the bearing the meaning of code: 7002136 cases (135 series diesel engine crankshaftmain bearing), the basic code from right to left to identify. 36 two digits representing the light inside, it is calculated as 36 x 5 = 180 mm, 1 diameter series light,2 represents a type forcylindrical roller bearing, 00represents the structure form bearing no outer wall,7 series ofnarrow width. If the purchase of 7 digit other standard model bearing code can such push.

  Buy agricultural bearings multiple reference bearing inner diameter, inner diameter of bearings in the basic codewith the right end of the first, the second digit representation. Bearing inner diameter of sub standard and non-standard diameter, the difference between the integral multiples of non-standard diameter is not an integer or 5.