Surface strengthening method of the hottest bearin

The surface strengthening method of bearing steel

there are great differences between the working surface and the center of bearing parts in terms of state, structure and performance requirements, and the overall heat treatment often makes the two cannot be taken into account, and the potential of materials cannot be brought into full play. The application of material surface strengthening technology can not only better solve the differences between the surface and the center in terms of structure and requirements, but also further enable the surface to obtain some special working properties, so as to meet the requirements of the bearing working under specific conditions. This is of great significance in the development of modern science and technology

the traditional surface strengthening method belongs to the category of heat treatment in technology. However, in modern times, some mines have been developing at low prices, resulting in increased inventory. At present, the surface strengthening methods such as laser, electron beam and ion beam have not only applied some high and new technologies to the surface strengthening of materials, but also exceeded the traditional heat treatment scope in technology, forming a new technical field. Therefore, the current surface strengthening technology can form a variety of classification methods from different angles. According to the physical and chemical processes of surface strengthening technology, it can be roughly divided into five categories: surface deformation strengthening, surface heat treatment strengthening, chemical heat treatment strengthening, surface metallurgy strengthening, and surface film strengthening

1. Surface deformation strengthening

the metal surface layer is plastically deformed by mechanical methods to form a hardened layer with high hardness and high strength. This surface strengthening method is called using stanyl and stanyl fortii to produce connector surface deformation strengthening with a wall thickness of 0.12mm, also known as work hardening. Including shot blasting, sand blasting, cold extrusion, rolling, cold rolling and impact, explosion impact strengthening, etc. The characteristics of these methods are: the strengthening layer dislocation density is increased, and the sub crystal structure is refined, so that its hardness and strength are improved, and the surface roughness value is reduced, which can significantly improve the surface fatigue strength of parts and reduce the sensitivity of fatigue notch. This strengthening method has the advantages of simple process and remarkable effect. There is no obvious boundary between the hardened layer and the matrix, and the structure is coherent. China building materials - building materials YiDianTong · ranks the top three. It is superior to its peers

and is not easy to fall off in use. Most of its methods have been applied in the bearing industry: the surface impact strengthening of rolling elements is the application of such methods, and precision rolling has become a new ferrule processing and strengthening method

2. Surface heat treatment strengthening

quenching the surface layer of parts by rapid heating through solid-state phase transformation is called surface heat treatment, commonly known as surface quenching. It includes flame heating quenching, high (medium) frequency induction heating quenching, laser heating or electron beam heating quenching, etc. The characteristics of these methods are: the surface is locally heated and quenched, and the workpiece deformation is small; Fast heating speed and high production efficiency; The heating time is short, and the surface oxidation decarburization is very slight

this method is especially effective in improving the wear resistance and fatigue strength of large and extra large bearing parts bearing a certain impact load. The distribution and processing mode of intermediate traders in the cluster has a significant effect. (end)