Configuration type of common rolling mill bearings

(1) Spherical roller bearings.  The configuration of the early rolling mill bearings on the rolling mill is different from the present. At that time, two sets of spherical roller bearings were mainly installed side by side on the same roller neck. This configuration basically meets the production conditions at that time, and the rolling speed can reach 600 rpm.

(2) Four-row cylindrical roller bearing + thrust bearing. The inner diameter of the cylindrical roller bearing is tightly matched with the roll neck, and it can bear radial force.  The cylindrical roller bearing has advantages of large load capacity, high limit speed, high precision, easy processing, low production cost, convenient installation and disassembly and the inner and outer rings can be separated.  The thrust bearing bears axial force, and the specific structure type can be selected according to the characteristics of the rolling mill. While for heavy-duty low-speed, we can equip with thrust roller bearings to withstand the thrust load with a small axial clearance. When the rolling speed is high, it is equipped with angular contact ball bearings so that speed limit is high and the axial clearance can be controlled. This type of bearing configuration not only has long bearing life, high reliability, but also has many advantages such as high precision and easy control of rolling products. Therefore, it is widely used in wire rod mills, sheet mills, foil mills, and support rolls for cold rolling mills and hot rolling mills.

(3). Four-row tapered roller bearings. The tapered roller bearings can withstand both radial and axial forces, and no need to configure thrust bearings. The inner diameter of the tapered roller bearing is loosely matched with the roll neck. It is very convenient to install and disassemble, but sometimes it will cause sliding creep due to the loose fit. Therefore, the inner diameter is often processed with a spiral oil groove. This type of configuration is widely used in the working roll of four-roll hot rolling mill and a cold rolling mill, and roll for blanking machine, steel beam rolling mill.

If you want to know more, please visit http://www.zys-bearings.com/ or send e-mail to zysdong@gmail.com. 

Classification of bearings by working principle

Classification of bearings by working principle


The bearing type is the bearing type used by the air cooling radiator fan. In mechanical engineering,  Four-Row Taper Roller Bearing the type of bearing is very much, but used in the radiator products bearing the form in accordance with the basic working principle of the classification so three using sliding sleeve bearing sleeve bearing and rolling friction of the ball bearings (ball bearing) and two bearings form with the use of the three hybrid.

Major radiator manufacturers in bearings with the launch of the new technology in recent years, such as magnetic bearing, fluid protection system bearings, hydraulic bearings, rifle bearing, fatigue testing machine nano ceramic bearing are also on the above the basic form of bearings improved, basic working principle is no change.

Tapered roller bearing structural features

Tapered roller bearing structural features
Tapered roller bearing type code is 30000, tapered roller bearings for the separation of Four-Row Taper Roller Bearing. Under normal circumstances, with tapered especially in the "Rolling bearings tolerance" are involved in the size range of roller bearings between the outer and inner components are interchangeable hundred percent can be used. The angle of the outer ring and the outer raceway diameter has been normalized to the same size and shape provides. When allowed to change in design and manufacturing. To cause between tapered roller bearing outer ring and inner components can be interchanged in common worldwide. Tapered roller bearings are mainly used to bear radial load mainly radial and axial joint load. Compared with angular contact ball bearings, bearing capacity, low speed limits. Tapered roller bearings can withstand axial load in one direction, a direction to limit the axial displacement of the shaft or housing.

Fixed according to the work load of the size taper roller bearing

In order to ensure the bearing after installation without excessive deformation must do:
(1) shaft and housing bore roundness and a shoulder block to the verticality of precision bearings according to the respective requirements.
(2) it is necessary to accurately calculate the amount of interference with the rotation of the ring, but also accurately calculate the appropriate amount of fixed rings.
Rotating rings blanch the extent possible, the amount of interference should also get smaller. As long as the effects of thermal expansion and ensure the operating temperature, and the maximum Sealed bearing  speed under the influence of centrifugal force, so as not to cause a tight fit creeping or sliding surfaces. Fixed according to the work load of the size of the ring and bearing size, select a very small clearance fit or interference fit, too loose or too tight is not conducive to maintaining the exact original shape.
(3) If the bearing at high speed operation, and higher operating temperature, should pay special attention to rotating rings can not be too loose to prevent the tie appeared eccentric, and a gap can not be fixed ferrule to prevent the ferrule deformation under load taper roller bearing and vibration excitation.
Impact (4) to take a small Four-Row Taper Roller Bearing fixed ring interference fit condition is to match the shape of the surface of both sides have high accuracy and less roughness, or cause installation difficulties disassembly harder, also need to consider the thermal expansion of the spindle .
(5) the use of pairs of angular contact ball bearing spindle, mostly lighter loads, such as interference with its larger, its internal axial preload amount will be significantly larger, adversely affected. Double row cylindrical roller bearings and tapered roller bearing spindle spindle, its load is relatively large, so its interference with relatively large.