Rolling mill bearing performance can be effective use, a great extent depends on the lubrication, lubricant is called "bearing the fifth parts". Rolling mill bearing damage reason 40% above is caused by poor lubrication, and, therefore, to reduce the consumption of rolling mill bearing, must choose suitable for the conditions of use of the method and the high quality lubrication lubricant, and design installation prevent water and oxide skin and reliable sealing device of foreign invasion.
At present mainly by the rolling mill bearing grease lubrication and oil-gas lubrication. Now manufacturers are mostly use the easy way grease lubrication, such as possible to use oil-gas lubrication technology, can make the rolling mill bearing in a more ideal lubrication under the working conditions, can greatly reduce bearing consumption.
1, grease lubrication
The grease lubrication method is simple and easy to operate, and easy to change characteristics of roll, is a widely application. Should be based on the rolling mill bearing working temperature, speed, rolling force and seal waterproof performance, impact vibration size, for fat methods appropriate choice of grease. Should choose high temperature resistant, viscosity of strong, extreme pressure properties and good resistance to water drench the high performance of normal manufacturer grease. According to the working characteristics of rolling mill bearing should choose to contain EP additives # 2 and # 3, lithium base fat or polyurea fat.
Though the grease of high performance purchase cost is high, but consumption, bearing life long, the comprehensive cost is reduced. In addition a grease filling quantity must want right amount and fill in place, different type of grease can't combination, make rolling mill bearing a work surface oil film is always in the normal state.
2, filling fat mass
The first filling grease will fill the internal space of the bearing can, for vertical roll or inclined roller bearing cover up and down within each to fill enough grease. Every time roll change to check whether grease after hardened black, whether be impurities pollution, whether oxidation emulsification. If appear above shall be completely replace grease and check the sealing parts and sealing structure change in time or improvement; If the condition is good can be added after new fat continue to use.
3, oil-gas lubrication
Oil-gas lubrication is bearing the ideal lubrication method, bearing in a job every once in a while compressed air with oil drops into bearing internal, lubricating oil in bearing internal, air will bearing the operation of the heat away from me, and stop external impurities water vapor into internal bearing. Oil is not atomization not pollute the environment.
4 seals and sealing devices
Bearing seal is to keep the internal good lubrication state, and to prevent the oxidation of cooling water, iron, impurities dipped into the working surface of extend the service life of the bearings. Because of rolling mill bearing seal problem, bearing damage is most is close to the side of the roll body parts, bearings often because grease pollution, erosion, the parts in a work surface wear, flake even break, especially with the cold rolling emulsion infiltration, make a grease failure faster.
Bearing seal is divided into bringing seal and outer seal two kinds. The outer seal mainly USES the labyrinth and contact with the combination of design. The more the maze level (no less than the poles) clearance of the seal of the smaller the better the results. Maze of the clearance of the size of the bearing size according to take unilateral radial 0.6 ~ 1.5 mm; Axial 4 ~ 6 mm.
Contact skeleton oil seal: it in rolling mill in apply more extensive, in order to increase the effect can be two or three tied for use. Oil seal have directional, the cannot be installed. ReGaJi general with two oil seal, the two oil seal lips mouth to the housing, to prevent the outside world into dirt. Cold rolling mill with general outfit three oil seal near the bearing a oil seal lips mouth to inside, to prevent grease spill affect metal rolling quality. Be careful when using oil seal, avoid outfit roll into bad lips mouth, affect the sealing effect.
RBR type sealing ring: this is a kind of rolling mill bearing special rubber lips type sealing ring, in recent years has been widely used. RBR sealing ring the axial seal method, its lips mouth posted on the surface of the gland, and are not subject to the influence of the roll beating, bearing the old fat can overflow internal, external cooling water, oxidation iron, impurities be lips mouth block access to, and have a good sealing effect. And easy to use, roll change when loaded roll bearing has no effect.




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