Bearings are important parts in high-speed rail EMUs, and their safe use is very important. Therefore, bearings on high-speed rail EMUs are regarded as one of the high-end rolling bearings in my country, and high-speed rail bearings should have high speed and high load capacity during use. Capability, high reliability, low temperature resistance, corrosion resistance, low vibration, noise and other characteristics.

High-speed rail bearings mainly refer to axlebox bearings, traction motor bearings and gearbox bearings in high-speed railway rolling stock. The first requirement of railway transportation is safety, especially for passenger trains, safe operation is even more important. The running part of the high-speed rail EMU, the bogie, is the core component that guarantees the high-speed, safe and stable operation of the train, and the bearing is one of the key parts.

At present, in the high-end bearing manufacturing field, the United States, Japan, Germany and Sweden have occupied most of the bearing market. Although China's overall sales accounted for 24%, the bearing output in 2014 reached 19.6 billion sets, but The vast majority is the low-to-mid-end bearing market. Nowadays, most of China's high-end bearings are imported from abroad. Even if the import price is about ten times its cost, my country's manufacturing industry can only accept it with pain.

However, China's high-end bearing breakthrough began with high-speed rail bearings. Recently, China's high-speed rail has also ushered in the localization of key components. The overcoming of high-end bearings for high-speed rail indicates that China's high-precision bearing manufacturing technology has reached the world's leading level.

The two most basic and difficult processes for high-end bearing manufacturing are raw materials and processing technology. At present, China has produced top-quality steel with a content of less than 5ppm in the steel manufacturing of high-end bearing raw materials. The addition of rare earths is the core of China's high-end bearing steel breakthrough. . In the bearing manufacturing process, the Chinese scientific research team has also carried out relevant research in 2011, and has now accumulated a wealth of experience and data foundation.

The high-speed rail bearings manufactured by China's Luoyang Bearing Factory have completed a 1.2 million kilometers on-vehicle test at a speed of 250 to 300 kilometers per hour, marking a major breakthrough in the localization of China's high-speed rail bearings. We are no longer at a disadvantage on the high-end bearings used in high-speed railways. The bearing swing error of laser bearings used in high-speed railways is required to be kept below two thousandths of a millimeter. At the same time, the bearing temperature cannot exceed 15 degrees Celsius when high-speed trains are running. As a representative enterprise of Chinese bearings, Luoyang Bearing Factory chose to overcome difficulties in facing such high-standard high-speed rail bearings. In terms of the outer diameter of high-speed rail bearings, Luoyang bearings have gone through 87 processes to ensure the quality of the bearings. With a high precision of one thousandth of a millimeter, Luoyang Bearing Factory keeps tackling key problems to control the radial swing error of the bearing to 0.7 thousandths of a millimeter, which has reached the international advanced standard. At the same time, the cost of the high-speed rail bearing of Luoyang Bearing is only one-seventh of that of foreign bearings. This also makes China's import of high-end bearings even bigger. Speaking of the representative enterprises of China's bearing manufacturing industry, China Luoyang Bearing Factory, Luoyang Bearing Factory Bear the brunt.

Since its establishment in the 1950s, Luozhou has not only created a number of industry firsts in the breakthrough of high-speed rail high-precision bearings, but also has created many industry firsts in the bearing manufacturing industry of other industries. It has won the only national gold award in the industry. In the nine major bearing manufacturing in the bearing industry, LUZ has the ability to manufacture bearings in the fields of aerospace, hydropower and rail transportation. In China, China Luozhou has contributed a lot to it, and it has also played a resounding sign in the international arena.

Bearings embodies the core basic components of a country’s industrial technology level. Bearing technology is also the crystallization of long-term accumulation of multidisciplinary technology. High-end bearings embo Good level. my country can make a major breakthrough in railway bearing technology. I believe that in other high-end bearing fields, my country will also make great progress and gains. This breakthrough in high-speed rail precision bearing technology will also lay a good foundation for the future of my country's high-end bearing manufacturing industry. With a solid foundation, I believe that in the near future, high-end bearings in more fields will be localized.

[Source: China Research Network] Author: Zhongwei Bearing Network