When it comes to high-speed rail, I believe many friends have already experienced the comfort and convenience of high-speed rail. But I don't know if any friends have carefully observed that the wheels of the high-speed rail are actually different from the cars of ordinary green trains. Because the wheels of the green car are not made of steel.
And from the point of view of appearance, the degree of rust is generally greater than that of high-speed rail bullet trains. However, the speed of ordinary speed trains is generally slower than that of high-speed rail bullet trains, so from this point of view, the wheels of high-speed rail bullet trains are undoubtedly more wear-resistant.
Otherwise, it is easy to have accidents, or at least there will be large safety risks. On the other hand, we all know that the speed of high-speed rail bullet trains is very fast, which makes its inertial force play a very large role. Once something happens, the consequences are unimaginable.
Therefore, the quality of China's high-speed rail wheels is generally very good, not only wear-resistant but also high-temperature resistant. This is because the friction between the wheels and the rails is very strong when a fast train is moving, which is then converted from kinetic energy into heat energy, and the temperature is very high.
If it is not temperature and wear-resistant, it is easy to have problems. However, what many people don't know is that China has not yet achieved 100% domestic production in the production and manufacturing of high-speed rail wheels, although China has achieved 100% self-design of high-speed rail EMUs.
However, the two are not the same concept, and it can only be said that in some respects, there are still some shortcomings in our country. However, China is also increasing its independent research and development efforts in this area, such as medium-carbon SI-V microalloyed D2 wheels, which have been exported to many overseas countries.
As we all know, China's high-speed rail has become a business card for export under the continuous development of the times. After the successful completion of the Jakarta-Bandung high-speed railway, the high-speed rail project in Indonesia, it was tested by Jokowi, Indonesia, and praised the smooth operation of the high-speed railway.
However, although China's high-speed rail claims to be self-designed to 100%, it does not mean that the degree of self-development and manufacturing is also 100%. The meaning of this sentence is that in the R&D and manufacturing of high-speed rail vehicles, there are products with the core technology of other countries.
High-speed rail wheels are an important example. In the period when the development speed of China's high-speed rail is not very fast, Japan, Germany, Italy and France have relied on the advanced technology on the wheels of high-speed rail to open their mouths to the lion of our country, which is not the end. The level of secrecy is also high.
For fear that China will not rely on their products after knowing the core process manufacturing, such a gas volume undoubtedly makes China's R & D personnel and a group of experts secretly shake their heads and compete with each other, and it is necessary to develop China's self-produced domestic high-speed rail wheels.
After a long period of exploration, China finally achieved an independent breakthrough in high-speed rail wheel technology. It can be said that if there is no breakthrough in this technology, the external publicity of China's high-speed rail will not be so loud.
As mentioned earlier, high-speed rail trains have extremely high requirements for wheels due to their heavy weight and high speed in the process of driving. The performance of this high requirement is to be both wear-resistant and temperature-resistant, and of course, the most important thing is to be acceptable in quality.
Because if the quality is not up to par, then it is easy to cause motor car accidents. Therefore, from this point of view, the material of high-speed rail wheels must use extremely special special materials. Secondly, the finished product must maintain considerable stability.
It is not possible to crack everywhere and small gaps due to various unexpected situations, so the wheel technology used to make general-speed trains is obviously not feasible for high-speed rail. The criteria for inspecting qualified high-speed rail wheels are not only the requirements for stability and special materials.
Therefore, the manufacture of high-speed rail wheels in China was particularly difficult in the early stage of development, and due to the impact of long-term technical blockade, it had to rely on imports from abroad. It is worth mentioning that the wheel steel used to manufacture high-speed rail wheels has very high requirements for oxygen content.
According to relevant information, the oxygen content in the wheel steel can not exceed 00002%。It is also very complicated to manufacture such high-quality high-speed rail wheels in China, and it must be fired and cut at high temperatures throughout the whole process.
Confined to the prominent status quo of being stuck in the neck of foreign countries, a group of experts and related R&D personnel in China have begun the road of independent research and development exploration. The first breakthrough is in the special materials and stability, foreign wheels are generally made of wheel steel.
The processing technology of wheel steel is not in the hands of China, so finding special materials with extremely high precision and strength has become an urgent problem to be solved. Fortunately, in 2020, Chinese researchers invented microalloy materials as an alternative.
And it is recognized to a considerable extent in the post-event inspection, because the toughness and hardness are very suitable, which paves the way for a stable structure. The next step is to address load-bearing and flexibility. We all know that high-speed rail trains are heavy.
In order to maintain a stable running attitude, it is necessary to highlight the component and resultant force in the design of the wheel structure. The so-called force component is to use the leveling device to adjust the force to a relatively balanced state; The resultant force is to make the wheels fully loadable.
This is the only way to create continuous, high-intensity friction between the wheels and the rails, but without damage. Fortunately, these issues have been properly addressed. Today, the localization of China's high-speed rail wheels has reached more than 95%.
It can be said without hesitation that the independent production of high-speed rail wheels in China has been basically realized. Gone are the days of dependence on foreign imports. Not only that, China's high-speed rail wheels have also accelerated the pace of overseas exports. China's high-speed rail is famous all over the world!