Rolling mill oil film bearing technology, developed under the guidance of "independence, self-reliance" policy. Reviewed, research the Chinese rolling mill oil film bearing technology is beneficial for the recognition, facilitation, development of the rolling mill oil film bearing technology.
The rolling mill oil film bearing technology, is a systems engineering technologies, at the same time, the field of is also a multi-disciplinary integrated engineering technology, its rate of development and the formation of supporting capacity from one side to reflect the Chinese industry development speed and reached the level. Hereby brief discussion of several key aspects of the operation technology, manufacturing technology, testing technology, theoretical research, product development, turnkey capability.
A run, including the rolling mill oil film bearing parts of the reservoir release, cleaning, installation, commissioning, operation, maintenance, diagnosis, and management body of knowledge and skills. Running the correct use of the technology is a reliable guarantee for the safe operation of the bearing.
The early 1950s, China's only reversing mill of Anshan Iron and Steel Cold Rolling Mill is equipped with oil film bearings. Its operation and management, in full accordance with relevant regulations of the Soviet Union. Traditional crafts, little rolling pressure, rolling speed is also low, the lubrication system is also very simple, run the technical level is relatively low. But in the actual operation, the management, technical personnel and operating workers work very seriously, in strict accordance with the procedures to do, accumulated use, and maintenance experience. However, due to the lack of in-depth understanding of the bearing works, some of the less reasonable procedures have been followed for almost two years, such as bearing components installed, do 35N/cm2 the pressure test, if the oil spill, that is, tighten the The rotary seal, no leakage so far. However, after a pressure test after the adjustment, use the effect is not good, but too short life of seals. This seal is "J" shaped seal with a skeleton, and rely on lip seal, tighten the pressure test, no longer is a lip seal, but a cling to the rotating surface of the ribbon seal. But after all, fundamental, the successful run of the mill oil film bearing, or start from here.
Beginning of the 1960s and 1970s, our own equipment, rolling mill oil film bearings put into operation, mill Wuyang Iron and Steel Company 4200mm special plate φ1300mm roll film bearings, φ300 mm rack roll film bearings and Benxi Iron and Steel Company φ1700mm hot rolling mill oil film bearings bearing roller φ1100mm as the representative of a number of new bearings put into operation, the former is a single stand rolling mill, which is a multi-rack rolling mill. A number of multi-rack rolling mill oil film bearings put into operation, to popularize and improve our rolling mill oil film bearings run. On the management side, with a professional and technical personnel and skilled workers, dedicated workplace oil film bearing the workplace will be closed, the oil film bearing maintenance personnel, lubrication staff have clear job responsibilities and operating procedures, division of labor increasingly Fine, management more scientific, standardized. Bearing structure improvements and updates of the lubrication system, bearing installation, commissioning and lubrication system maintenance operations, than in the 1950s have made great progress, coupled with the rolling mill oil film bearing the successful use of the operation technology to the modern level step closer.
70 to 80 years in our country have complete sets of the introduction of Wuhan Iron and Steel Company 1700mm hot, cold sheet rolling mill and Shanghai Baoshan Iron and Steel Plant, 2050mm and 2030mm hot, cold plate rolling mill at the same time, also will be complete sets of the introduction of Mogeyier (MORGOIL) bearings and Mai Sita (MESTA) bearings, its main operating personnel, including technical personnel, skilled workers have carried out the job training, after the device is put into operation, and to ensure the continuous safe operation of bearing, which marks the of rolling mill oil film bearings run, close to the world level.
Since the 1990s, and complete sets to the introduction of the mill and rolling mill oil film bearings - main is Mogeyier bearings, is to buy second-hand rolling equipment, into the oil film bearings, the main types of friction The Ge Yier bearing. Thus, in some of the main types of mill, such as wire rod mill, single stand reversing mill, semi-rolling mill, rolling mill and section mill are all equipped with oil film bearings; from the bearing types, the Soviet-type liquid-friction bearings, China TZ brand oil film bearings, the United States the Mai Sita film bearing and Mogeyier, (film) bearings, can be regarded as the world today has a rolling mill oil film bearings (including lubrication system) the most complete variety of countries. According to incomplete statistics, China has a dozen iron and steel company (factory), nearly 200 mill is equipped with oil film bearings, can not help that the huge number. This case illustrates the rolling mill oil film bearing operation technology has been widely popularized in China, and has reached a new level in today's world.
Manufacturing Technology Development of our rolling mill oil film bearing parts, began in the late 1950s, in the drawings, nor information, three non-proprietary equipment.
The development of the rolling mill oil film bearing parts, is not easy, from material selection, process line, processing methods, special tooling design and manufacture a set of working procedures. From material selection to take into account the matching of the taper sleeve and anti-friction material, the forging process of the taper sleeve, bushing steel sleeve and antifriction material combination of steel sets of processes; from the process line, to meet the cone, bush technical requirements, but also to utilize the existing processing equipment, which in itself requires a good combination of theory and practice, for example, in the inner surface of the steel sets the physical (including machining) and chemical treatment, in order to increase the binding capacity ; processing methods, we know that the taper sleeve and bushing products for civilian use in the machining accuracy of sleeve surface roughness Ra0.05μm (bush Ra0.2μm), high geometric accuracy, the deformation is difficult to control the surface roughness low, must be super finishing, the surface does not allow multi-prismatic, spiral chatter; the design and manufacture of special tooling, is also very important is the processing methods to ensure the machining accuracy is the key.
The early 1960s, completed the development of the main parts of the oil film bearing on the general machine tools manufacturing.
The late 1960s, Taiyuan heavy plant and built a mill oil film bearing the specialized production workshop, and began a new period of our entire manufacturing rolling mill oil film bearings.
Testing techniques, consists of two parts: one part for the manufacture of measurement techniques, another part of the pilot study of measurement techniques.
Oil film bearing the main parts of high precision machining, accurate and fast measurements. To achieve this, firstly, a high-precision measuring instruments (with) and a matching auxiliary equipment (a), at the same time, the quality control after the completion of the processing of the measurement and processing measurement, you must perform scientific measurements methods and technical skill. To this end, in addition to purchasing, customized high-precision measuring instruments (a) In addition, also designed, created a special instrument (a) and accompanied by, the implementation of a set of scientific measurement methods and procedures. This ensures that the measurement repeatability, high accuracy.
To better understand the parameters of the oil film bearing, explore the regularity of the Taiyuan heavy machinery since 1972 a lot of laboratory bench measurements and bearings carrying the actual running, turn the power consumption, fuel measurement of the external and internal parameters. Test range, bearing internal work area of ??the film pressure field, film thickness field and the oil film temperature field, the measurement of these field quantities are unconventional in nature, from the measurement sensor to the secondary instrument, there was no readily available to buy, so the development of their own. Taiyuan Heavy Machinery Works strength test room, and built a team of professional testing, joint research with Tsinghua University and other units were testing techniques and instrumentation research and development work, has a resistive, inductive, capacitive and eddy current testing technology and research and development of a secondary instrument, and succeeded in obtaining large amounts of data, good repeatability, regularity, and high measurement accuracy. At the same time, but also related technologies, including calibration, interference, and the rotation signal transmission, as well as a variety of signal synchronization measurement, recording, print, research and application.
4 theoretical research, in the rolling mill oil film bearing the main parts of the successful development of the former Ministry of Machinery at the same time issued the task of product development and theoretical research to the Taiyuan heavy machinery, the early 1960s, theoretical research, product design calculations, based on is based on the experience.
Mill capacity level, led to theoretical studies of the mill oil film bearing, real autonomy to carry out theoretical research work began in 1974. The main work is to investigate the working mechanism of a mathematical model from the classical lubrication theory, numerical methods, quasi-analytical method, the theoretical studies cited deep step. Elastohydrodynamic theory applied research work in view of the classical theory of peak oil film pressure above 100MPa, then, At that time, the elastohydrodynamic some scholars, to focus only on the Anti-shaped contact Vice Elastohydrodynamic study of plain bearings, considered atypical elastohydrodynamic problem, and even suggested that overload the oil film bearing does not belong to the scope of the EHL. After in-depth study and found that the thickness of the week to the distribution of the unique phenomenon of "necking" Elastohydrodynamic theory, the axial distribution in the membrane is also different from the classical theory, the oil film pressure peak position after the shift, and eccentricity can be calculated to ε> 1, confirmed the rolling mill oil film bearing lubrication theory belongs to the elastohydrodynamic problem. With the development of modern rolling mill to the direction of the high-speed heavy, then the heat - the study of the elastohydrodynamic theory. Also more in-depth static - hydrodynamic lubrication theory, design and development of China's first set of static - dynamic pressure oil film bearings.
5 product development, our design and development of mill oil film bearing, which is based on the former Soviet Union in the early 1950s manufacturing bearings and a little bit of plant information. The mill oil film bearing, from the performance, only applies to low-speed rolling; old structure, assembly and disassembly, maintenance is very inconvenient. From the mid-1960s, our own design and manufacture of heavy plate, special plate mill and 1700mm Hot and cold rolling mill in the international environment, rolling mill bearings can only be developed by manufacturing difficulties due to the extra large rolling bearing, have adopted the The oil film bearing.
The first generation of domestic mill oil film bearing oil film bearing 4200mm special plate mill of φ1300mm representatives belong to the low speed and heavy, is a significant improvement only in the structure than the Soviet-style oil film bearings, the second generation of domestic mill oil film bearings to 1700mm heat, cold rolling mill φ1100mm oil film bearing as the representative, mill speed, structure design, rapid assembly and disassembly improved; the third generation of domestic mill oil film bearing, φ500mm static, 650mm plate mill, a dynamic pressure of the oil film bearings, represented by bearing performance significantly improved, the carrying capacity has doubled, the structural design is also more perfect, close Mogeyier bearing, is the world after the United States, former Soviet Union countries third independent design and manufacture of static a hydrodynamic oil film bearings. Independent development capacity of the mill oil film bearings in China, second only to the United States and the former Soviet Union, but static --depth study of the hydrodynamic oil film bearings and form of selection, we are better than they. For example, on the design of the oil chamber, the United States has adopted the central oil chamber, the former Soviet Union four oil chamber, and our axially symmetric dual oil cavity, until 1994, the static hydrodynamic oil film bearings by a single oil cavity improved dual oil cavity is evident. Sign rolling mill oil film bearing the contemporary level of oil film bearing of the early 1990s for the Jiuquan Iron and Steel Company developed φ1350mmTZ license, using a symmetric double oil chamber static - the hydrodynamic oil film bearings hydraulic lock, the new rotary seal, bi-directional thrust and rapid assembly and disassembly and other advanced technologies.
6 sets of capabilities, mill oil film bearing, were used in three types: static pressure of pure, pure dynamic pressure, static - dynamic pressure. Pure hydrostatic oil film bearings are not in the mill industry promotion, pure dynamic pressure oil film bearings are widely used in various types of reversible rolling mill and hot strip mill, static - dynamic pressure oil film bearings are mainly used in cold rolling mill, also used in strengthening rolling reversing mill. Evaluation of these three types of film bearing the complete set of capabilities to static - the hydrodynamic oil film bearings, represented by:
Design and manufacture of the bearing body (1), in the design, the shape of the oil chamber, size, number, location determined, the choice of bearing the main parameters of the static system pressure, flow, viscosity, to determine the numerical calculation, the optimal selection and assurance in the manufacture of high carrying capacity, high running accuracy can complete on their own, the AGC system and provide users with film thickness variation correction curve;
(2) high pressure oil supply system, the system design, according to the different rolling mill system, designed to adapt to the requirements, safe and reliable ultrahigh-pressure fuel supply system, together with the bearing design to determine the economic pressure - flow parameters , also system equipped with a special device to ensure that the four bearings in the oil chamber pressure balanced. EHV components, in the early 1980s, the country already successfully developed a working pressure of 100MPa, the flow rate of 10L/min pump, set - shunts, load vent valve, pressure gauge, hose, quick coupling, etc., to achieve their own sets of domestic and production use.
(3) hydraulic lock and quick-release, rapid assembly and disassembly, began in the late 1970s for products to meet the modern mill, especially the use of the rolling mill. For better control of sleeve axial compression force and a fast, safe disassembly and early 1980s, began the development of the hydraulic locking device has been successfully used in the product.
(4) rotary seals, modern mill, especially the rolling mill, rolling speed, continuously improve, more and more stringent requirements rotary seal bearing. On the basis of absorbing contemporary rotary sealing advantages, gradually improve the formation of the rotary seal in the form, from mold design, plastic material formulations, curing process, physical and chemical inspection and product testing and so on maturity matching.
From the six areas listed above, it is easy to see that China can complete design and manufacture of dynamic pressure, static - dynamic pressure of the rolling mill oil film bearings and dynamic pressure, static pressure oil supply system to meet the requirements of the various types of modern mill. Can be said that the Chinese mill oil film bearing technology, has become a complete system engineering, rolling mill oil film bearing technology is developed independently, is a rolling mill oil film bearings to work closely with the result of joint efforts; present, and melt into foreign advanced manufacturing technology, is moving to the higher realm.



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