Importance of bearing products
To be honest, there are not many black technologies about bearings in high-speed railway. I think it is very important to make a product to the extreme. Bearing is a small thing that many people don't like, but it is precisely this small part that can make the plane fly low, the machine tool is not stable enough, and the car can't drive fast. Both Germany and Sweden are typical craftsman countries, advocating the pursuit of industry to the extreme. And technology has been accompanied by the development of other industries.
It's not that China can't make bearings like this, but:
·The accuracy is not as high as that of foreign products
·Foreign products are not skillfully designed and tested. Foreign products are not mature
It is a series of poor points, resulting in a slight deficiency on the whole.
Many people think that I drive at a high speed, the conditions are harsh, in fact, it is not necessarily. Here we mainly consider the linear velocity. This linear speed is mainly for the linear speed of the relative moving part of the bearing. For high-speed rail, automobile and other ground vehicles, the wheel diameter has guaranteed the speed of the bearing itself, and the bearing linear speed converted from this speed is not strict at all, and may even be less severe than the bearing environment on your engine. The harsh environment in terms of speed often comes from the processing industry or wind power industry. For example, tens of thousands or even hundreds of thousands of spindles. What is the influence of linear velocity? It mainly affects the cycle cycle, film formation and heating, or in general, it can be understood as affecting the service life. Of course, there are still many things involved, such as affecting the heating, but the heat effect should comprehensively consider the heat dissipation efficiency; For example, the influence of film formation depends on the lubrication mode; For example, the weight of the load should be considered when affecting the cycle cycle. Therefore, it's good to have a bearings general understanding. Further, it involves disciplines such as elasticity, fluid mechanics and fatigue mechanics. It's good to be interested in understanding it by yourself.
