In recent years, the development speed of China's high-speed rail needless to say, in the world to be fast, safe and famous, but there is a bit of a fly in the ointment is that at the beginning of the development of China's high-speed rail, many parts need to be imported from abroad, the cost is high, maintenance is also very inconvenient, under the unremitting efforts of China's scientific researchers, finally most of the parts will be localized, only the manufacture of bearings and wheels has not made a breakthrough. How difficult is it to build a high-speed rail wheel that is usually not very conspicuous? For a long time, it has been monopolized by France, Germany, Italy, and Japan for a long time, and it took a lot of effort for our country to overcome all the problems and successfully counterattack.
The speed of the train needs to reach more than 200 kilometers per hour to be called high-speed rail, and the speed of China's high-speed rail is basically between 200-350 kilometers per hour, and the operation process is very smooth and safe, which makes the rest of the world envious. The high-speed rail running speed is extremely fast, the friction between the wheels and the track can be imagined, the heat generated by friction will cause the wheels to be in a high temperature state for a long time, so the high-speed rail wheels not only need to withstand the high temperature, but also in the process of temperature changes can not be deformed, only in this way can ensure the safety and stability of the train operation.
This requirement sounds very simple, but it is very difficult to operate in practice, because many bearings and small parts are also connected to the high-speed rail wheels, and the requirements for its machining accuracy are also very high. For a long time, only France, Germany, Italy and Japan in the world have mastered the production technology of high-speed rail wheels, and the wheels built in France can support the operation of high-speed rail at a speed of 510 kilometers per hour, and the related technology is at the world's leading level. However, these countries have strictly blocked this technology, refused to visit other countries for exchanges, for fear of leaking any secrets, as long as this technology is firmly in their hands, they have the opportunity to make huge profits. In fact, these countries have indeed relied on this technology to firmly control the international market for many years.
The wear and tear of high-speed rail wheels is very fast, driving 48 hours or 4,000 kilometers need to be repaired, and when the mileage reaches 2.4 million kilometers, it must be forcibly replaced, relying on high-priced imports is not a long-term solution. After years of independent research and development, the wheels of China's two Fuxing high-speed railways have now been domestically produced.
The requirements for manufacturing high-speed rail wheels are very harsh, need to withstand the heat brought by high-speed operation, but also have enough strength, toughness, need to withstand high temperature and low temperature to ensure stability, even if there are 0.2 mm defects on the wheel may cause safety hazards, so the raw material requirements for the wheel are very high, the special steel for the production of wheels can not contain other metal impurities, but also through the complex forging process, after making the wheel also need to be its hardness, anti-magnetic absorption and other properties for precision testing, only fully qualified to officially go off the line.
Despite the very difficult construction, Chinese enterprises have fully achieved the goal of localization and reached the ability to produce 100,000 pairs of wheels per year. From steel to anti-loosen nuts, to bearings, wheels and other components, we have achieved localization step by step, and we have to say that China's high-speed rail industry is indeed getting stronger and stronger.