From automobiles, high-speed trains, aircraft to instruments and mechanical equipment, almost all rotating machinery can be found with a common core component -- bearings.Bearing steel, the material needed for the manufacture of bearings, is known as the "king of steel" because it is directly related to the life and reliability of bearings.
Bearing's working environment is severe and complex, which not only requires high-speed and stable rotation, but also bears strong extrusion, friction, and even ultra-high temperature experience.Because of this, the quality and reliability of bearing steel have extremely strict requirements.
How to improve the quality of bearing steel?First, the interior should be pure enough, the less inclusion the better;Second, it is uniform enough, and the particles in the material are as small and diffuse as possible.However, it is regrettable that for a long time, the quality of bearing steel produced in China has a large gap with the international advanced level.Take inclusions as an example, the size of inclusions in foreign products is completely less than or equal to 10 microns, while the largest size in China is 50-52 microns, "the size difference is as much as 5 times".
Because INA bearing steel belongs to high carbon steel, its carbon content is higher in all steels.If the carbide is unevenly distributed and in large chunks, the quality will be seriously affected."It's like kneading dough with a handful of salt. If the dough isn't broken and evenly kneaded, the dough will be all salty and hard.""Make the salt more finely and evenly distributed in the surface" is the goal of the team.
Laboratory data showed that the grain size was reduced from 50 microns to 10 microns by the high-power spinning technique, and the carbide size was reduced by only 10 times.Bearing steel hardness at the same time greatly improved, in the world's top level.In addition, the life and reliability of bearings have been greatly improved.The technology can also significantly improve the efficiency of materials and shorten the production process.
