Analysis on the development of domestic rolling mill bearing manufacturing technology
Rolling mill bearings are the bearings used on the roll necks and rollers of metallurgical, mining and other rolling mill stands. Cylindrical roller bearings are usually used to withstand radial loads, deep groove ball bearings or angular contact ball bearings, or radial design or thrust design tapered roller bearings to withstand axial loads. Most of them are lubricated and cooled by means of oil-air lubrication or oil mist lubrication.
The oil film bearing technology of rolling mill is a systematic engineering technology. At the same time, it is also a comprehensive engineering technology in multi-disciplinary field. Its development speed and supporting capacity reflect the development speed and level of Chinese industry from one aspect. In the early 1950s, only the reversing mill of Angang Cold Rolling Mill was equipped with oil film bearings. Its operation management is carried out in full accordance with the relevant regulations of the Soviet Union. In the traditional process, the rolling pressure is not large, the rolling speed is low, the lubrication system is also simple, and the operating technology level is relatively low. However, in actual operation, the work of management, technical personnel and operating workers are very serious, strictly in accordance with the regulations, and accumulated experience in use and maintenance.
However, due to the lack of in-depth understanding of the working principle of the bearing, some unreasonable procedures have been followed for almost two years. For example, after the bearing components are installed, a 35N/cm2 compression test is to be carried out. Rotate the seal until it does not leak. However, after such a pressure test adjustment, the effect is not good, and the life of the seal is also short. This kind of seal is a "J" type seal with a skeleton. It is sealed by the lip. After the pressure test is adjusted, it is no longer the lip seal, but a band seal that clings to the rotary surface. But after all, the success of the rolling mill oil film bearing is still starting from here. In the early 1960s, China's self-equipped rolling mill oil film bearing was put into operation, represented by the φ1300mm roll oil film bearing of the 4200mm thick plate mill of Wuyang Iron and Steel Co., Ltd., the φ300mm rack roll oil film bearing and the φ1700mm hot strip mill support roll φ1100mm oil film bearing of Benxi Iron and Steel Co., Ltd. A number of new bearings were put into operation, the former being a single-stand rolling mill and the latter being a multi-stand rolling mill.
The operation of a number of multi-stand rolling mill oil film bearings has enabled the popularization and improvement of China's rolling mill oil film bearing operation technology. In terms of management, there is a team of professional technicians and skilled workers, a dedicated work site, and the oil film bearing work room is closed. The oil film bearing maintenance personnel and lubrication personnel have clear job responsibilities and operating procedures, and the division of labor is increasingly Fine, management is more scientific and standardized. Due to the improvement of the bearing structure and the update of the lubrication system, the maintenance and operation of the bearing and the maintenance of the lubrication system have been greatly improved compared with the 1950s. In addition, the successful use of the oil film bearing of the continuous rolling mill makes the operation technology to a modern level. Close to one step.
In the 1970s and 1980s, in China, the 1700mm hot and cold sheet mills of Wuhan Iron and Steel Co., Ltd. and the 2050mm and 2030mm hot and cold sheet mills of Shanghai Baoshan Iron and Steel Plant were introduced in succession, and Mogoir was also introduced. (MORGOIL) bearings and MESTA bearings, the main operating personnel, including technicians, skilled workers have been on-the-job training, and after the equipment is put into production, the continuous and safe operation of the bearings is ensured, which marks the bearing China's rolling mill oil film bearing operation technology has been close to the world level at that time.
Since the 1990s, the rolling mill and rolling mill oil film bearings have been introduced in series – mainly Mogoil bearings, and more often, when buying second-hand rolling equipment, oil film bearings have been introduced. The main types are also Goyle bearings. In this way, on some major types of rolling mills, such as 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 bearing types, there are Soviet-type liquid friction bearings, China TZ Brand oil film bearings, US Mesta oil film bearings and Mogoil (oil film) bearings, can be called the world's most complete range of rolling mill oil film bearings (including lubrication systems). According to incomplete statistics, there are currently more than 20 steel companies (factories) in China, and nearly 200 rolling mills are equipped with oil film bearings. The number cannot be said to be huge. This situation is enough to show that the rolling mill oil film bearing operation technology has been widely popularized in China and has reached the new level in the world today.
As a key supporting bearing in the metallurgical and rolling mill industry, the manufacturing level of rolling mill bearings represents the processing and manufacturing level of large and extra large bearings in a country. Many countries have put the manufacturing technology of rolling mill bearings in a very important position for in-depth research. Similarly, Luoyang is a new heavy industrial city after China's establishment. It is one of the first industrial cities in China to be built in the first five-year plan. It is a veritable republican eldest son. After 60 years of construction, Luoyang has formed a relatively complete industrial system. The contribution rate of the industrial economy to the city's economic growth is as high as 74%. The five pillar industries such as equipment manufacturing, energy and power, petrochemical, new materials, silicon photovoltaic and optoelectronics account for The proportion of industrial enterprises above designated size reached 71.5%, and the bearing manufacturing technology in Luoyang also played a leading role in the domestic bearing industry. As a professional manufacturer of rolling mill bearings in Luoyang, Luoyang Huigong Bearing Technology Co., Ltd. is a specialized company specializing in the design, manufacture, research and development and sales of large and extra large bearings. Formerly known as Luoyang Huigong Large Bearing Manufacturing Co., Ltd., it was established in 1998. It is famous for producing bearings for cast rolling, cold rolling, hot rolling mill bearings and high-precision foil rolling mills. It is the most mature and most advanced in China. After more than ten years of hard work, Luoyang Huigong has obtained six patented technologies, including bearing equipment for supporting roll neck of continuous casting and rolling mill, and bearing dust removal device for rolling mill. In 2008, it became the first private partner and teaching practice base of Henan University of Science and Technology, applying the characteristics of bearing application, lubrication, torque, noise, heat treatment and other aspects to the production practice. The company's products have passed the ISO9001:2008 quality management system certification. Export products can be tested by third parties such as SGS, DNV, ABS, ASIA and other international testing agencies according to customer requirements. Huigong Bearing has maintained steady development and increased foreign trade export, and has now formed industrialization and scale. Spiral bearings for excavators, ship cranes, casting and rolling, cold rolling, hot rolling mill bearings and high-precision foil rolling mill bearings, as well as thin-walled bearings and military bearings have been successfully developed, and qualified for stable supply; successful development Several high-precision precision bearings have been highly praised by users.
Compared with imported similar bearings, domestic rolling mill bearings not only have considerable technical level and higher quality assurance, but also have obvious price advantages. Huigong Bearing currently has a large number of customers from well-known brands at home and abroad. The products are exported to more than 30 countries and regions such as the United States, Japan, India and Spain. The sales performance has broken through and increased steadily year by year.
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