I have been engaged in rolling mill bearing industry for more than ten years, which is also a stage of rapid development of China's steel industry. From the original bearing bush to the later imported rolling mill bearing localization substitution, from the original manual screw rod adjustment roll gap to the nearly advanced electrical control system, from the ancient rubber shingle horizontal rolling mill brought by Japan in 1937 to the world's advanced Simak and Mitsubishi Hitachi, from the rough three high rolling mill to the precise Sendzimir 20 high roll, etc I have a lot of feelings about the application of rolling mill bearings in steel and non-ferrous rolling equipment, so in the future, let's talk about those things about rolling mill bearings.

A long time ago, an old engineer with more than 40 years of roll grinding assembly experience in WISCO taught me: "Xiao Wang, you can't only understand bearings, you must also understand rolling equipment and rolling technology. If you only understand bearings, you can't do well in bearing application, because bearing application involves too many things. A master of rolling mill bearing industry also said to me, "jump out of the bearing and look at the bearing, you will see another scene.". I think they both mean the same thing.

Some people will think that the bearing is not an iron pimple, what is difficult to do? In fact, the rolling mill bearing is a very precise mechanical part, its machining accuracy is measured in μ. In the process of participating in the rolling mill work, it is an indispensable rotating part, but the situation can be imagined when it is applied in a very bad working environment. In addition, it is one of the important fault points of the equipment, and it is a weak and unfortunate link in the whole rolling mill composition. Why do we say so? Let's give a few examples

a. Bearing lubrication system failure, poor lubrication;

b. The bearing box is deformed and the inner hole is elliptical;

c. Bearing box liner or housing liner is used for a long time without adjustment, replacement and out of tolerance;

d. Roll grinding belt taper;

e. Foundation settlement of rolling mill;

All the above problems directly reflect the result of bearing damage!!!

These are directly reflected, and there are also some hidden situations, such as: there is no special tool for installation and disassembly, resulting in scratches on the rolling surface of the bearing; belt breakage, roll explosion, emergency shutdown, resulting in large instantaneous impact load, resulting in microcracks on the rolling surface; and, for example, the ultra short start-up and stop of the current rolling mill's electro-mechanical control system after upgrading, resulting in the reduction of bearing life, and so on.

Rolling mill bearing is like a little daughter-in-law in the process of rolling. As long as there are problems in other aspects, it is always her who is damaged. It is difficult and difficult to finish her mission excellently if she wants to finish her life safely on such a rugged road.

If we treat bearings like our own cars, then everything is not so difficult. Most of these problems can be avoided. As a result, the consumption of bearings is reduced, the labor intensity of employees is reduced, the rolling mill runs smoothly and the production capacity is improved. All the savings are real gold and silver. Therefore, energy saving and consumption reduction should start with bearings!

Don't talk about it, just a little dry stuff! High energy ahead, please pay attention!!!

There are so many reasons that affect the bearing life of rolling mill. How to solve it? Today we will talk about the basic bearing disassembly and installation.

Disassembly and installation of extra large bearing for backup roll of six high cold rolling mill

1. Rolling body scratch

2. The inner sleeve is scratched

Cause of damage

Seeing this picture, some friends may say that we are also assembled by driving cars, but we have chain fall. Yes, chain fall is better than pure double rope hoisting, but can you guarantee that your roller frame is horizontal? Can you guarantee that the bearing housing can be leveled by manually adjusting the chain block? It is difficult to control the inertia of objects in the assembly process. Human beings have known from the primitive society to use tools for production and life. Social development has experienced several industrial revolutions, and the level of equipment has been constantly improved. From mechanization to intelligence, however, many steel enterprises still rely on sledge hammers and traveling cranes for bearing disassembly and assembly. Bearing disassembly damage is inevitable, but with the help of special equipment to complete this work, it can be improved or improved Avoid this situation.

 Solution

The improvement of the level of labor tools determines the level of production efficiency of enterprises. The video above is the disassembly and assembly of the intermediate roll bearing box of work roll in a cold rolling plant in East China. This is a set of rolling mill bearing roll system disassembly car, which moves left and right on the track by electric hub and moves up and down by hydraulic cylinder. The roller frame is fixed on the ground after adjusting the level, which can ensure the level of roll and bearing box, ensure the assembly efficiency and assembly quality, and reduce the labor intensity of workers It can effectively improve or avoid the scratch problem of bearing assembly and prolong the service life of bearing.

Well, let's talk about so much in this issue. If you need to know more about the solutions to the above problems, please contact us or discuss with us if you have other new problems. Timond cloud steel rolling studio will serve you wholeheartedly!

Summary of solutions to typical problems in "jumping out of bearings and looking at bearings - talking about bearings"

（1） Disassembly and installation of extra large bearing for backup roll of cold rolling mill

（2） Maintenance of bearing and treatment of initial fault hidden trouble

（3） Frequent burning of auxiliary bearings of intermediate roll and work roll in six high cold rolling mill

（4） Problems of bearing life reduction after upgrading control system of six high cold rolling mill

（5） The problem of the back roll bearing in the multi roll printing mill