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Rolling mill oil film bearing skills
Source: China Bearing Network Time: 2018-03-15
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China's rolling mill oil film bearing skills; is carried out under the "independent side; self-sufficiency" policy guidance. Review and discuss the Chinese rolling mill oil film bearing skills; about knowing, advancing and developing Chinese rolling mill oil film bearing skills is beneficial.
Rolling mill oil film bearing skills; is a system engineering skill; together; is also a comprehensive engineering skill in a multidisciplinary field; its speed of development and its supporting talents; from a side to reflect the speed and level of Chinese industry I will make a brief discussion on several primary aspects such as work skills, production skills, test skills, theoretical discussions, product development, and complete sets of talents.
1. Job skills; including a set of common sense and skills, such as storage, removal, equipment, commissioning, operation, repair, diagnosis, handling, etc. of rolling mill oil film bearing parts. Correct use of operating skills; reliable assurance of bearing safety operations.
At the beginning of the 50th era; as long as the reversing mill of Angang Cold Rolling Mill is equipped with oil film bearings. Its operation is handled; it is carried out in accordance with the relevant regulations of the Soviet Union. The traditional process; the rolling pressure is not large; the rolling speed is also low; the smooth system is also very simple; The skill level of the work is also relatively low. However, in the theoretical operation, the operations, skill personnel and operators are very careful; the procedures are strictly followed; the application and protection experience are accumulated. However, due to the lack of deepening of the bearing operation principle, Some unreasonable procedures have always been used in two eras; for example; after the bearing components are installed; to do 35N / cm2 repression test; if it is oil leakage; that is, tighten the reverse seal; until no leakage stops. After such a pressure test adjustment; the effect is not good; and; the life of the seal is also short. This seal is a "J" seal with a skeleton; it is sealed by the lip; pressure test tightening After that; it is no longer a lip seal; it is a ribbon seal that clings to the reverse appearance. But after all, it does not hide; the successful operation of the rolling mill oil film bearing; still from this Starting from the inside.
At the beginning of the 60 70 era; China's own rolling mill oil film bearing put into operation; φ1300mm roll oil film bearing, φ300mm rack roll oil film bearing of Wuyang Iron and Steel Company 4200mm thick plate mill and φ1700mm hot rolling mill support roll φ1100mm oil film bearing of Benxi Iron and Steel Co., Ltd. A group of new bearings represented by the operation; the former is a single-stand rolling mill; the latter is a multi-stand rolling mill. A number of multi-stand rolling mill oil film bearings are put into operation; so that China's rolling mill oil film bearing operation skills can be spread and advanced. Aspect; a professional technician and skilled workers; a dedicated work site; oil film bearing operation room closure; oil film bearing repair personnel, smooth personnel have clear job responsibilities and operating procedures; division of labor increasingly sophisticated; The management is more scientific and standard. Because of the improvement of the bearing layout and the update of the smooth system; in the debugging of the bearing equipment and the protection of the smooth system; both have made great progress compared with the 50 era; coupled with the successful application of the oil film bearing of the continuous rolling mill; Make the work skills a step closer to the modern level.
70~80 era; in China, the 1700mm hot and cold sheet mills of Wuhan Iron and Steel Company and the 2050mm and 2030mm hot and cold sheet mills of Shanghai Baoshan Iron and Steel Co., Ltd. were introduced in succession; (MORGOIL) bearings and Mesta (MESTA) bearings; its chief operating personnel; including skilled personnel, skilled workers have been on-the-job training; and after the equipment is put into production; and ensure the bearing's continuous, safe operation; China's rolling mill oil film bearing operation skills; now close to the world level.
Since the 90th century, the rolling mill and rolling mill oil film bearings have been introduced in the first place, Mogoil bearings; more often, when buying second-hand rolling equipment; oil film bearings have been introduced; the primary type is also Mogoy. Bearings. In this way; in some of the primary types of rolling mills; for example, wire rod mills, single-stand reversing mills, semi-continuous rolling mills, continuous rolling mills and profile mills are equipped with oil film bearings, from the type of bearings; there are Soviet-type liquid conflict bearings ; China TZ brand oil film bearing; US Mesta oil film bearing and Mogoil (oil film) bearing; can be called the world's most complete rolling mill oil film bearing (including smooth system). According to incomplete statistics; At present, there are more than 20 steel companies (factories) in China; nearly 200 rolling mills are equipped with oil film bearings; the number cannot be said to be grand. This situation is sufficient to clarify that the skills of rolling mill oil film bearing operations are now widely available in China; Has now reached a new level in today's world.
2. Production skills; the development of the primary parts of China's rolling mill oil film bearings; started in the late 50s; in the absence of a pattern, two materials, three no proprietary equipment.
It is not easy to develop the first part of rolling mill oil film bearing; it has a complete set of operating procedures from material selection, process road, processing method to special tooling drawing and production. From material selection; to consider the pairing of taper sleeve and antifriction material The casting process of the taper sleeve; the connection between the bushing steel sleeve and the friction reducing material; the technological process of the steel sleeve, from the craft road; the satisfaction of the skill requirements of the cone and the bushing; together with the existing processing equipment; The theory of self-demand is in good contact with the theory; for example, how to carry out physical (including machining) and chemical treatment in the inner and outer parts of the steel sleeve; to add contact force, in the processing method; we know; the cone sleeve and the bushing are civilian products The processing precision is the highest; the roughness of the taper sleeve is Ra0. 05μm (the bushing is Ra0. 2μm); the precision is high; the deformation is difficult to control; the surface roughness is low; the super finishing is necessary; the outer prism is not allowed to be presented. , spiral, vibrating, etc., the depiction and production of special tooling; it is also very important; it is the end of processing methods; to ensure the accuracy of processing accuracy.
At the beginning of the 60s; completed the development of the first part of the oil film bearing on the general machine tool.
In the late 60s; Taiyuan Heavy Machinery Plant built a special production workshop for rolling mill oil film bearings; it started a new era of China's complete production of rolling mill oil film bearings.
3. Test skills; consists of two parts: one is the measurement skill of the part processing; the other part is the measurement skill in the experimental discussion.
Because the processing precision of the primary part of the oil film bearing is high; the demand measurement is accurate and convenient. In order to reach this demand, it is necessary to have a high-precision measuring instrument (with) and a supporting instrument (with); The measurement and the quality inspection after the completion of the processing; it is necessary to perform scientific measurement methods and skilled skills. To this end; in addition to purchasing, custom high-precision measuring instruments (with); also depicting and producing special instruments (with) And attachments; fulfill a set of scientific measurement methods and procedures. This ensures that the measurement repeatability is good; high precision.
In order to deepen the parameters of the oil film bearing operation; discuss the regularity; Taiyuan Heavy Machinery Factory has done a lot of laboratory bench measurement and bearing load, transformation, power consumption and oil supply in the theoretical operation since 1972. Such as the measurement of external internal parameters. Test scale; oil film pressure field, oil film thickness field and oil film temperature field including the inner working area of ​​the bearing; the measurement of these fields is attributed to unconventional; from measuring sensor to secondary appearance; There is no ready-made to buy; therefore; to develop by itself. The strength laboratory of Taiyuan Heavy Machinery Plant is the main body; a professional test force is built; joint research with Tsinghua University and other units; research and development of test skills and instrument appearance ; Conducted resistance, inductive, capacitive and eddy current testing skills and research and development of primary and secondary instruments; and successfully obtained a lot of data; good repeatability; strong regularity; high precision measurement. Also related skills; including calibration, anti-interference, reverse signal delivery; and simultaneous measurement, recording, printing, etc. of various signals Conducted research and application.
4 theoretical discussion; after the successful development of the primary parts of the rolling mill oil film bearing; the former Ministry of Machinery issued the product development and theoretical research mission to the Taiyuan Heavy Machinery Plant; the theoretical research work in the early 60s; the first is the product's depiction accounting; It is based on experience.
Following the continuous advancement of the rolling mill installation level; led the theoretical research work of the rolling mill oil film bearing; real self-initial theoretical research work; began in 1974. The primary operation at that time is to discuss the operating mechanism; from the classical smooth theory to establish a mathematical model; numerical accounting Method; quasi-analytical method; etc.; further study of theoretical research. In view of the classical theory, the peak pressure of the oil film reaches 100MPa or more; then the application of the theory of the elastic flow theory is carried out; at that time; some experts who study the eruption; only pay attention to The study of the high-elastic flow of the anti-touch; and the sliding bearing; thought it was an atypical eruption problem; even some people thought that the heavy-duty oil film bearing did not belong to the field of elastic flow. After deepening the discussion, it was found that the circumferential spread of the film thickness was presented. Significant "necking" is a unique appearance in the theory of elastic flow; the axial dispersion behind the membrane is also different from the classical theory; the peak pressure of the oil film is shifted backward; and the eccentricity can be calculated to ε%26gt;1; The smoothing theory of the oil film bearing of the rolling mill is attributed to the problem of the elastic flow. It is followed by the modern continuous rolling mill to the direction of high speed and heavy load; then the thermal bomb flow is carried out. Seminar together; also compare deepen conducted static and dynamic pressure theory seminar smooth operation; depicts the development of the first set of static - hydrodynamic oil film bearing.
5 product development; China describes the development of rolling mill oil film bearings; its roots are the bearing products and a little factory material produced in the early 50s of the former Soviet Union. At that time, the oil film bearing of the rolling mill; functionally speaking; only suitable for low-speed rolling, from the layout Said; compared to staleness; assembly and disassembly, protection is very inconvenient. From the beginning of the 60th era; China painted its own thick plate, extra-thick plate mill and 1700mm hot and cold tandem mill; in the international environment at the time; mill bearings only Can develop by themselves; because of the difficulty of making large-scale rolling bearings; oil film bearings are used.
The first generation of domestic rolling mill oil film bearing; represented by φ1300mm oil film bearing of 4200mm thick plate mill; attributed to low speed and heavy load; only in the layout, the Soviet oil film bearing has been greatly improved, the second generation domestic rolling mill oil film bearing; The φ1100mm oil film bearing of 1700mm hot and cold continuous rolling mill is represented; the speed of the rolling mill is advanced; the layout drawing is improved; the speed of assembly and disassembly is improved, the third generation domestic rolling mill oil film bearing; the φ500mm static and dynamic oil film of 650mm plate rolling mill The bearing is representative; the bearing function is obviously improved; the bearing capacity is doubled; the layout is also perfected; it is close to the Mogoil bearing; it is the third independent painting of the static and dynamic oil film bearing in the world after the United States and the former Soviet Union. National. China's rolling mill oil film bearing independent development ability; second only to the United States and the former Soviet Union; but from the deepening of the static pressure film bearing research and method selection; we are better than them. For example; on the oil cavity depiction; the United States Choose one oil chamber in the center; the former Soviet Union chooses four oil chambers; and China chooses axially symmetric double oil chamber type; until 1994; The oil film bearing has been improved from a single oil chamber to a double oil chamber type; it can be seen that the marking machine oil film bearing is the φ1350mmTZ oil film bearing developed by Jiuquan Iron and Steel Co., Ltd. at the beginning of the 1990s; the symmetrical double oil chamber static-dynamic pressure is selected. Oil film bearing hydraulic locking, new reverse sealing, two-way thrust and rapid assembly and disassembly leading skills.
6 sets of talents; China's rolling mill oil film bearings; a total of three types: pure static pressure, pure dynamic pressure, static and dynamic pressure. Pure static pressure oil film bearings have not been promoted in the rolling mill occupation; pure dynamic oil film bearings are widely used in All kinds of reversing rolling mills and hot rolling mills; static and dynamic oil film bearings are mainly used in cold rolling mills; also used in reversing rolling mills for intensified rolling. Evaluation of the complete set of these three types of oil film bearings; static pressure oil film bearings to represent:
(1) depiction and fabrication of the bearing body; in the depiction; the determination of the shape, size, size and orientation of the oil cavity; the selection of the primary parameters of the bearing; the determination of the pressure, flow and viscosity of the static pressure system; numerical accounting, selection; In the production to ensure high load capacity, high precision, etc.; can be completed by themselves; and provide users with the AGC system required oil film thickness change correction curve,
(2) Ultra-high pressure oil supply system; in the system description; can be based on the different rolling rules of the rolling mill; depict the habitual demand, safe and reliable ultra-high pressure oil supply system; and determine the economic and reasonable pressure flow parameters together with the bearing depiction In the system, there is a special equipment to ensure the pressure balance of each oil chamber in the four bearings. On the ultra-high voltage components; at the beginning of the 80s; China has successfully developed a working pressure of 100MPa and a flow rate of 10L/min. Pump, set shunt, relief valve, pressure gauge, hose, rapid joint number; completed domestic self-set; and put into production.
(3) Hydraulic locking and rapid assembly and disassembly; rapid assembly and disassembly; in the late 70s, the beginning is used for products; satisfactory modern rolling mill; especially the application requirements of continuous rolling mill. For better control of the axial compression of the taper sleeve Force and convenient and safe assembly and disassembly; at the beginning of the 80s; the development of hydraulic locking equipment; has been successfully applied to the product.
(4) Reversal sealing; modern rolling mills; especially continuous rolling mills; rolling speeds continue to advance; the demand for bearing reversing seals is also becoming more stringent. On the roots of the various reversing seals in this world; China's reverse sealing method; from the mold drawing, rubber compounding, vulcanization process, physical and chemical inspection and product testing, etc. are sophisticated.
From the six aspects listed above; it is not difficult to see; China can complete the production of dynamic pressure, static and dynamic rolling mill oil film bearings and dynamic pressure, static pressure oil supply system; satisfied with the needs of various modern rolling mills. Can say this; China Rolling mill oil film bearing skills; has now become a good system engineering skills; China's rolling mill oil film bearing skills are independently launched; is the Chinese mill's oil film bearing operators closely cooperate; the results of joint efforts, at the time; and into the foreign lead Production skills; moving into a higher level
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