spindle bearing needi

spindle bearing needing preload is generally as angular contact ball bearings front bearing use.
angular contact ball bearing is generally used in groups, pre tightening in two ways,
1, bearing between the spacer sleeve, the top outer ring, inner ring with pressure pretightening nut.
2, at the end of main shaft side top outer ring, inner ring with a pre tightening nut pressure behind.
Methods 1 septum sleeve ends parallel precision must be very good. Mode 2, pressure ring side of the shaft is vertical to very good accuracy.
On the vertical accuracy requirements of bearing side with the thread of the locking nut is also high.
In addition, bearing must not install anti, anti loaded words bearing will be pressed powder.Note that the pre tension (or preload) must meet the requirements of bearing the instructions, otherwise it will damage the bearing.

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

Spindle bearing and running

The running purpose is to make the bearing in the formal angle before, the roller and raceway contact through running, can have good conditions, to maintain the bearing contact with good accuracy, and avoid the damage of the bearing roller in the beginning due to high-speed and heavy haul when in use and the raceway, thereby improving the bearing  life and accuracy .

  Because the taper roller bearing is not completely rolling contact, between the shoulder and the inner roller end the existence of sliding contact, if the condition is not good, it is easy to appear the phenomenon of occlusal damage, so more attention should be paid to this kind of bearing running.

  The precision 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.

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.