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Rolling Mill Bearing

Rolling Mill Bearing


                                   The oil film bearing in rolling mill technology, is a system engineering, at the same time, also is a multi-disciplinary comprehensive in the field of engineering technology, its development speed and supporting ability, which is formed by the from one side to reflect the level of China's industrial development speed and are reaching.We are from the run technology, manufacturing technology, testing technology and theory research, product development, several major aspects such as complete sets of ability are briefly discussed
1. The operation technology, including the oil film bearing in rolling mill parts store, cleaning, installation, commissioning, operation, maintenance, diagnosis, management, etc. A set of knowledge and skills.The correct use of running technology is the reliable guarantee for the safe operation of the bearing.
The early 50 s, our country only anshan reversible rolling mill is equipped with the oil film bearing abrasion.Its operation and management, fully carried out in accordance with the relevant regulations of the Soviet union.Traditional process, the rolling pressure, rolling speed is low, the lubrication system is simple, the operation technology level is relatively low.But in actual operation, the management and operation of technical personnel and workers are very serious, in strict accordance with the procedures, the use and maintenance experience.
But due to the lack of an understanding of the working principle of the bearing, some less reasonable almost two procedures have been followed a s, for example, bearing components, to be 35 n/cm2 suppression test, if the oil spill, namely tighten rotary sealing, until don't leak.But, after such a pressure adjustment, the effect is not good to use, and the life of the seal is short.This seal is "J" type with skeleton seal, relies on the lip seal, pressure test after tighten, is no longer a lip seal, it is a cling to strip on the surface of the rotary seal.But, after all, in spite of his flaws, the success of the oil film bearing in rolling mill run, or start from here.
Early '60 s equipment by China oil film bearing in rolling mill put into operation, with a 4200 mm plate mill of wuyang iron and steel company rolling oil film bearing, phi phi 1300 mm to 300 mm breast roll oil film bearing and benxi iron and steel company for HSM machine backup roll phi phi 1700 mm 1100 mm of oil film bearing as a representative of a batch of new bearing in operation, the former is single stand mill, the latter is more rack tandem mill.
Several more of the frame of the oil film bearing in rolling mill put into operation, the operation technology of the oil film bearing in rolling mill in our country has gained popularity and improve.In management, have a professional team of technical personnel and skilled workers, have special work place, workshop closed oil film bearing, oil film bearing lubrication and maintenance personnel have clear responsibilities and operational procedures, division of labor is increasingly sophisticated, more scientific, standardized management.Due to the improvement of bearing structure and lubrication system update, the bearing installation and maintenance operations on lubrication system, has made great progress than the 50 s, together with the successful use of the oil film bearing, are a step closer to the standards of operation technology to modern.
70 s ~ 80 s, in our country have been introduced complete sets of wuhan iron and steel company's 1700 mm hot sheet, cold rolling mill and Shanghai baoshan iron and steel factory of 2050 mm and 2030 mm hot sheet, cold tandem mill at the same time, with complete sets of the introduction of the ilse MORGOIL bearing and Mr Michael stark (MESTA) bearing, the main operating personnel, including technical personnel and skilled workers are carried on the job training, and after the equipment production, and ensure the continuous and safe operation of bearing, the marks of the oil film bearing in rolling mill operation technology in China, is close to the level of the world.

Were introduced into the 90 s, and complete sets of rolling mill and the oil film bearing in rolling mill - mainly the il bearing, and more about when buying second-hand equipment of steel rolling, and into the oil film bearing, the main type is also the dog il bearings.Such, in some of the major types of rolling mill, such as wire mill, single stand reversible rolling mill, and tandem mill, rolling mill and bar mill is equipped with oil film bearing;Says from the bearing type, with the Soviet union type liquid friction bearing, China TZ oil film bearing, oil film bearing in American Michael stark and amraphel, oil film bearing, can be in today's world has (including lubrication system) of the oil film bearing in rolling mill the widest variety of countries.According to incomplete statistics, there are two steel companies in China (factory), nearly 200 rolling mill is equipped with the oil film bearing, the number can't believe it.This kind of situation, enough to run shows that the oil film bearing in rolling mill technology has been widely spread in China, and has reached a new level in the world today.

Rolling mill bearing (6)

2. Manufacturing technology, the development of the main parts of the oil film bearing in rolling mill in our country, began in the late 50 s, the pattern is in nothing, no information, nor any proprietary equipment situation.Development of the oil film bearing in rolling mill main parts, is not easy, from material selection, process route and processing methods to specialized equipment and tooling design and manufacturing, etc. Has a complete set of work procedures.From material choice, consider the taper sleeve and anti-friction material matching, taper sleeve forging manufacturability, the combination of bushing steel bushing and anti-friction material, the technological process of the steel bushing;From the technology, to satisfy the requirements of the cone, bushing, as well as using the existing processing equipment, that in itself need good combination of theory and practice, for example, on the inner surface of the steel bushing how physics (including machining) and chemical processing, to increase binding force;On the processing method, we know that the taper sleeve and the sleeve is the highest, in the civilian goods in processing precision taper sleeve surface roughness for Ra0.05 microns (bushing Ra0.2 microns), high geometric accuracy, deformation and difficult to control, low surface roughness, superfinishing, must be carried out in the surface are not allowed to appear more prisms, spiral, marks, etc.;Specialized equipment and tooling design and manufacture, it is also important, is to realize the machining method, ensure the machining accuracy of the key.
In the early 60 s, completed in the general machine tools on the development of the main parts of the oil film bearing manufacturing.The late 60 s, taiyuan heavy factory built the oil film bearing in rolling mill is specialized production workshop, began a complete set of manufacturing in China in the new period of the oil film bearing in rolling mill.
3. Testing technology, including two parts: the part of the measuring technique for parts processing, another part of the measurement techniques in experimental study.
Because of the main parts of the oil film bearing in high machining accuracy, measurement precision, fast.In order to achieve this requirement, the first to have high precision measuring instruments (tools) and the associated with auxiliary instruments (tools), at the same time, the measurement and processing after the completion of the inspection in the process of measurement, must carry out the scientific measurement and have skilled technology.Therefore, in addition to the purchase, custom precision measuring instruments (tools), also design and manufacture the special instrument () and affix, implement a set of scientific measurement methods and procedures.This ensures the measurement repeatability and high precision.
For a thorough understanding of the work of the oil film bearing parameters, explore the regularity, taiyuan heavy factory since 1972 to do a lot of laboratory bench measurement and work in the actual operation of bearing, bearing rotation, electricity, oil and other external measurements of the internal parameters.Test range, including bearing internal work area of the oil film pressure field, such as oil film thickness and oil film temperature field, the field of measurement of unconventionality, from measurement sensors to secondary instrument, are not ready to buy.

So, developing itself.In taiyuan heavy factory lab as the main body strength, build a professional testing team, with tsinghua university and other units jointly, testing technology and instruments of research, development, has carried on the resistive, inductive, capacitive and eddy current testing technology and the primary and secondary instrument research and development, and successfully obtained a large amount of data, good repeatability, strong regularity, high measurement precision.At the same time, also the related technologies, including scaling, anti-interference, turn signal transmission, and a variety of signal synchronous measurement, recording, printing and so on has carried on the research and application.

Rolling mill bearing (4)

4 theory research, the main parts in the oil film bearing in rolling mill after successful development, the original machinery product development and theoretical research task to taiyuan heavy factory at the same time, the study of the theory of the early 60 s work, mainly is the product of design calculation, its foundation is based on experience.
With the constant improvement of the level of mill machine, led to the study of the theory of the oil film bearing in rolling mill work, truly independent theoretical research work, started in 1974.The main work is to investigate the working mechanism, from the classical lubrication theory to establish mathematical model, numerical calculation method, and accurate analytical method, etc., to guide theoretical research and deep step.In view of the classical theory of peak oil film pressure more than 100 mpa, which in turn to the application research of elastohydrodynamic lubrication theory, at the time, the research of elastohydrodynamic, some scholars only pay attention to the high of the shape of contact elastohydrodynamic studies, and the sliding bearing, think of atypical elastohydrodynamic problem, even some people think that do not belong to heavy oil film bearing elastohydrodynamic category.                                

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