The lubrication of the roller NSK bearing is basically the same as that of other rolling NSK bearings. However, the working condition of the roller NSK bearing is relatively bad, and whether the working performance can be effectively exerted depends largely on the lubrication condition of the NSK bearing.
The lubrication methods used for roll NSK bearings are mainly grease lubrication and oil lubrication.
The grease-lubricated grease has a sealing function, the sealing structure and the lubrication facility are simple, and the grease is convenient to be replenished. Therefore, as long as the working conditions permit, the roller NSK bearing is generally grease-lubricated.
The oil lubrication has a strong cooling effect and can remove dirt and moisture from the NSK bearing. Roll NSK bearings use oil-lubricated lubrication methods such as pressure oil lubrication, fuel injection lubrication, oil mist lubrication and oil and gas lubrication.
Pressure oil lubrication is the most effective lubrication method for roll NSK bearings at normal speed.
Injection lubrication is to lubricate the lubricant to the inside of the NSK bearing through a nozzle mounted on the NSK bearing side at a certain pressure. It is generally used in high-speed roll NSK bearings, or where the pressure supply lubrication cannot meet the cooling requirements.
Spray lubrication is to spray the dry compressed air containing oil mist into the NSK bearing for lubrication. The use of less oil, due to the action of air, the cooling effect is very strong, mainly used for large rolls NSK with high rolling speed and high rolling precision. Bearings, or NSK bearings for rolls that are not frequently removed in NSK bearing housings.
Pressure oil lubrication and fuel injection lubrication require the installation of inlet and outlet pipes, lubrication pumps, oil reservoirs, and sometimes oil coolers. Therefore, the cost is high, and NSK bearings are generally used less.
Second, the configuration type
(1), spherical roller bearing
The configuration of the early rolling mill NSK bearing on the rolling mill was different from the current one. At that time, two sets of spherical roller NSK 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. However, with the increase of speed, its shortcomings become more and more prominent: NSK bearing has short life, large consumption, low precision of finished products, serious wear of the roll neck, and large axial turbulence of the roll.
(2), four-row cylindrical roller bearing + thrust NSK bearing
The inner diameter of the cylindrical roller bearing is tightly matched with the roll neck and can withstand radial force. It has the advantages of large load capacity, high limit speed, high precision, separable inner and outer rings, interchangeable, easy processing, low production cost, convenient installation and disassembly, etc. The thrust NSK bearing is subjected to axial force, and the specific structure type can be selected according to the characteristics of the rolling mill.
Heavy-duty low-speed, with thrust roller bearings, with a small axial clearance to withstand the thrust load. When the rolling speed is high, it is equipped with angular contact ball NSK bearing, which not only has high limit speed, but also can control the axial clearance during operation. The rolls are tightly axially guided and can withstand typical axial load forces.
This type of NSK bearing configuration not only has NSK bearing long life, high reliability, but also has many advantages such as high precision and easy control of rolling products, so it is currently the most widely used, mostly used in wire rod mills, sheet mills, foil mills, doubles. Support rolls such as cold rolling mills and hot rolling mills.
(3), four row tapered roller bearings
The tapered roller NSK bearing can withstand both radial and axial forces without the need to configure a thrust NSK bearing, so the mainframe is more compact. The inner diameter of the tapered roller NSK bearing is loosely fitted 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 still widely used, such as the work rolls of four-high hot rolling mills and cold rolling mills, such as work rolls, blanking machines, and steel beam rolling mills.
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