Analysis of the smooth method of rolling mill bearings

Source: China Bearing Network Time: 2018-03-10

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First, the smooth method of the smoothness of the roller bearing is in principle common with the smoothness of other rolling bearings; only the working conditions of the roller bearing are relatively poor; whether the operation function can be usefully developed depends largely on the smooth condition of the bearing.
The smooth method used for roll bearings is primarily grease smooth and oil smooth.
The smooth and smooth grease has a sealing effect; the sealing layout and smooth equipment are simple; the smooth grease is convenient; therefore, only the working conditions are required; the roller bearings are usually made of grease smooth.
The oil has a smooth cooling effect; it can remove dirt and moisture from the bearing. The roller bearing adopts a smooth and smooth oil method with smooth oil supply, smooth fuel injection, smooth oil mist and smooth oil and gas.
Smooth pressure supply is the most useful smoothing method for roller bearings under conventional speed.
Smooth injection is to smooth the smooth oil through a nozzle mounted on one side of the bearing to the inside of the bearing for smoothing; usually used in high-speed roll bearings; perhaps where the pressure supply is smooth and the cooling demand is not satisfactory.
Smooth spray is to spray the dry compressed air rich in oil mist to the inside of the bearing for smoothness; the oil consumption is small; because of the action of air; the cooling effect is extremely strong; it is mainly used for large roll bearings with high rolling speed and high rolling precision. Perhaps used for roll bearings that are not often disassembled in the bearing housing.
Pressure supply and smooth oil injection require the installation of inlet and outlet pipes, smooth pumps, oil reservoirs; sometimes smooth oil coolers are required; therefore; the cost is higher; usually the roller bearings are less used.
Second, equipment type (1), spherical roller bearings Early rolling mill bearings on the rolling mill equipment type is different from today; when the first choice of two sets of spherical roller bearings side by side on the same roll neck. This type of equipment It is satisfied with the production conditions at that time; the rolling speed can reach 600 rpm. However, with the advancement of speed, the defects are more and more outstanding: short bearing life, large cost, low precision of the product, severe wear of the roll neck, axial roll of the roll Great.
(2), four-row cylindrical roller bearing + thrust bearing cylindrical roller bearing inner diameter and roller neck selection tight cooperation; accept radial force; with large load capacity, high limit speed, high precision, inner and outer rings can be separated and can be exchanged The processing is simple, the production cost is low, the device is easy to disassemble, and the thrust bearing receives the axial force; the detailed layout type can be selected according to the characteristics of the rolling mill.
Heavy-duty at low speed; with thrust roller bearing; with small axial clearance to accept thrust load. When rolling speed is high; with angular touch ball bearing; not only high speed limit; The gap can be strictly controlled to make the roll get tight axial guidance; and can accept the usual axial load force.
This type of bearing equipment not only has long bearing life; high reliability; it has many advantages such as high precision and easy handling of rolled products; so it is currently the most widely used; it is mostly used in wire rod mills, sheet mills, foil mills, double support rolls. Support rolls for rolling mill cold rolling mills and hot rolling mills.
(3) Four-row tapered roller bearing Tapered roller bearing can accept both radial force and axial force; no need to equip thrust bearing; therefore, the main machine becomes more compact. Tapered roller bearing inner diameter and roll neck are loose. Cooperation; installation and disassembly are very convenient; but sometimes due to loose cooperation, sliding creep; so the inner diameter is often processed with a spiral oil groove.
The current use of this type of equipment is still relatively wide; such as four-high hot rolling mill and cold rolling mill work rolls, blanking machines, steel beam rolling mills and other occasions.

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