Rolling mill bearing lubrication and sealing, bearing knowledge

Rolling mill bearing working performance can be effectively used, a considerable degree depends on the lubrication condition, the lubricant is referred to as 'bearing the fifth largest parts'. Damage reasons of rolling mill bearing more than 40% was caused by poor lubrication, so to reduce consumption of rolling mill bearing, we must choose suitable for the conditions of use of the lubrication methods and high-quality lubricants, design and installation to prevent water and scale and other foreign matter invasion and reliable sealing device. The rolling mill bearings are lubricated by grease lubrication and oil and gas. Most manufacturers are now used lubricating grease lubrication easy way, if possible take the oil-gas lubrication technology, can make the rolling mill bearings under the working conditions in the ideal lubrication, can greatly cut down the consumption of bearing. 1, grease grease lubrication method is simple, easy to roll the characteristics of easy to change, is widely applied. Should be according to the working temperature of rolling mill bearing, speed, rolling force and seal waterproof performance, and the size of the impact vibration, for fat method, and so on and so forth to choose appropriate grease. To use high temperature resistant, strong viscosity, good extreme pressure performance and water resistance of high normal manufacturer of grease. According to the features of rolling mill bearing should choose EP additives in 2 #, 3 #, lithium base grease or polyurea grease. Although high-performance grease procurement cost is high, but less dosage, bearing life long, the overall comprehensive cost is reduced. Additional the filling quantity of the grease must right amount and fill in place, different type of grease can not mix, make rolling mill bearing working surface is always in a state of oil film is normal. 2, filling grease filling grease for the first time the bearing internal space can be filled, for vertical roll or diagonal roll each bearing grease cover up and down inside to fill enough quantity. To check whether the grease is hardening after each roll change black, whether the impurity contamination, whether oxidative emulsion. If the above condition should be thoroughly change the grease and check the seal and seal structure change in time or improve; If the condition is good can continue to use after added new grease. 3, oil and gas lubrication oil and gas lubrication is the ideal lubrication bearing, bearing in the work of every once in a while internal compressed air with lubricating oil drops into the bearing, lubricating oil in the bearing inside, the air will be bearing heat away from the running, at the same time to prevent external water vapor impurities in bearing inside. Oil has not been atomized will not pollute the environment. 4, seal bearing seal is to be inside a good lubrication condition, and prevent the cooling water, iron oxide, prolong the service life of bearing surface impurities in work. Bearing damage due to the rolling mill bearing seal is near the roller side parts, bearing often because grease pollution, erosion, wear, peeling, and even make the parts work surface fracture, especially in cold strip rolling emulsion infiltration, disable grease faster. Bearing the seal of own seal and external seal divides into two kinds. By adopting the combination of labyrinth and contact the main external sealing design. The labyrinth, the greater the level Not less than the poles) The smaller the gap sealing effect is better. Radial labyrinth clearance according to the size of the bearing size take unilateral 0. 6 to 1. 5毫米; The axial 4 ~ 6 mm. Contact the skeleton oil seal, it is widely used on mill, in order to increase the effect can be used in two or three parallel. Oil seal has directivity, and cannot be installed backwards. Hot rolling mill with two oil seal, generally two oil seal lip to bearing seat, to prevent sewage into the outside world. Cold strip rolling is generally installed three near the bearing oil seal oil seal lip to inward, to prevent grease spill affect the quality of rolled products. Be careful when using the oil seal, avoid lip crashed when roller, affect the sealing effect. RBR type seal ring: this is a kind of special rubber lip type sealing ring rolling mill bearing, widely used in recent years. RBR sealing ring with the method of axial sealing, the lip stick on the base of gland, not affected by beating roll, bearing internal old fat can overflow, external cooling water, iron oxide, the impurity was blocked by the lip into, has good sealing effect. And easy to use, when the roll changing roll load bearing is not affected by any.