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Analysis of the smoothing and sealing skills of rolling mill bearings
Source: China Bearing Network Time: 2014-09-13
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At present, the rolling mill bearings are mainly made of smooth grease and smooth oil and gas. Most of the manufacturers now use the simple and smooth grease smooth method; if they can adopt the oil and gas smoothing skills; they can make the rolling mill bearings work under the smooth conditions of the intended aspiration; Bearing cost.
1. The smooth and smooth grease method is simple and easy to implement; the roller is convenient to replace; it is widely used. It should be selected according to the bearing temperature, rotation speed, rolling force, sealing and waterproof function, impact sensation, and grease supply. Suitable smooth grease. Use smooth grease with high temperature resistance, high viscosity, excellent extreme pressure function and high water-resistance function. According to the operation characteristics of rolling mill bearings, 2#, 3#, lithium base with EP additive should be selected. Fat or polyurea.
Although the high-performance smooth fat purchase cost is high; but the amount is small; the bearing life is long; the total induction cost is reduced. The filling amount of other smooth grease must be excessive and filled in place; the smooth grease of different trademarks cannot be mixed. The appearance of the rolling mill bearing operation is always in the normal state of the oil film.
2. Filling the grease with the grease can fill the inner space of the bearing at the beginning; about the vertical roller or the inclined roller, the upper and lower covers of each bearing seat should be filled with the smooth amount of grease. After each roller change, check whether the smooth grease can be Hardening and blackening; whether it can be contaminated by impurities; whether it can be oxidized and emulsified. If the above conditions are present, the smooth grease should be completely replaced and the seal and sealing layout should be replaced or improved in time. If the condition is still good, the new fat can be used continuously.
3, oil and gas smooth oil and gas smooth is a smooth way of bearing ambition, the bearing at the working edge of the compressed air at intervals of time with a smooth oil drop into the bearing inside; smooth oil stays inside the bearing, the air takes away the heat in the bearing operation, together Impede the external impurities, water vapor is immersed in the bearing. The oil is not atomized and does not pollute the environment.
4, sealing equipment bearing seal is to adhere to the outstanding internal smooth condition; and hinder the cooling water, iron oxide skin, impurities immersed in the operation of the extended bearing life of the operation. Because the bearing seal problem of the rolling mill; bearing damage is the most close to the side of the roll Parts; bearings are often contaminated and lost due to smooth grease; wear, detachment or even fragmentation of the parts; especially the emulsion of the cold strip mill; the smooth grease fails faster.
The seal of the bearing is divided into two types: self-contained seal and external seal. The outer seal is mainly selected by the combination of labyrinth and touch. The more stages of the labyrinth (not lower than the north and south poles), the smaller the gap, the better the seal. Maze The gap is taken from the radial side of the bearing scale to a single side of 0.6 to 1.5 mm and the axial direction of 4 to 6 mm.
Touch-type skeleton oil seal: it is widely used in rolling mills; it can be used side by side in order to add effect. Oil seal is directional; can not be reversed. Hot rolling mill usually has two oil seals; two oil seal lips must be bearing Outside the seat; to prevent the external dirt from immersing. The cold strip mill usually has three oil seals close to the bearing, one oil seal lip should be inward; to prevent the smooth grease overflow affecting the quality of the rolled material. Be careful when using the oil seal; Crash the lip; affect the sealing effect.
RBR type sealing ring: This is a kind of rubber lip sealing ring for rolling mill bearings; it has been widely used in these years. The RBR sealing ring adopts the method of axial sealing; its lip is attached to the base surface of the gland; The effect of the beating; the old grease inside the bearing can overflow; the external cooling water, iron oxide scale, impurities are obstructed by the lip; it has a good sealing effect and is convenient to use; when the roller is changed, the roller is not affected by the bearing seat. .
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