Many businesses use bearing steel bearings are not good enough, and even some low-quality bearing steel, thus leading to low production out of bearing products, like KOYO bearings as the company is not the same, bearing steel used is the best quality . But we are here for everyone to talk about how to make KOYO bearing steel surface hardening.

Bearing parts work surface and center in the state, structure and performance requirements is a greater difference, and the overall heat treatment tends to not take into account the potential of the material is also not full. Applied Materials, surface hardening technology not only can solve the differences between the surface and center of the structure and requirements, but also to further the surface to obtain some special work performance to meet SKF bearings work under certain conditions for the work surface performance requirements. This modern science and technology development is very meaningful. The traditional method of surface hardening, heat treatment within the scope of the process. The surface hardening methods for laser, electron beam, ion beam and other modern developed will not only be applied to the surface of some high-tech materials, strengthening, and in the process beyond the scope of traditional heat treatment, the formation of a new technology. So now strengthening surface multiple classification techniques can be formed from different angles, according to the surface to strengthen the physical and chemical process technology classification, it can be divided into five categories: surface deformation strengthening, surface heat treatment, chemical heat strengthened, surface metallurgical strengthening surface film strengthening.

1. Chemical heat strengthened

Solid state diffusion using some elements of infiltration, to change the chemical composition of the metal surface layer to achieve surface hardening method called chemical heat strengthened, also known as diffusion heat treatment. Including boriding metals, carburizing and carbonitriding, nitriding and nitrocarburizing, sulfide and Sulphonitrocarburizing, seepage chromium, aluminized and chrome aluminum silicon permeation, diffusion layer of graphite, etc. , a wide range of different characteristics. Incorporating the elements or dissolved in the base metal forming a solid solution or in combination with other metal elements combine to form compounds. In short penetration element that is the chemical composition of the surface layer can change, you can get a different phase structure. Process carburizing steel parts KOYO bearings and needle roller bearing sleeve KOYO nitriding surface hardening treatment belong to this category fortification.

2. Surface deformation strengthening

By mechanical means so that plastic deformation of the surface layer of the metal, thereby forming a high hardness and high strength of the hardened layer, the surface hardening method known as surface deformation strengthening, also called hardening. Including blasting, sand blasting, cold extrusion, rolling, grinding and cold shock, explosion shock and so on. Characteristics of these methods are: strengthening layer increased dislocation density, subgrain structure refinement, making it the hardness and strength increased, the surface roughness value decreases, can significantly improve the surface fatigue strength of parts and reduce fatigue notch sensitivity. This intensive process is simple and the effect is significant, there are no clear boundaries between the hardening layer and the substrate, structure coherent, easy to fall off during use. Most of the methods which have been applied in KOYO bearing industry: to strengthen the impact surface of the rolling body is the application of these methods, it has become a new precision rolling ferrule processing and fortification.

3. The surface heat treatment

The use of solid phase transformation, by rapid heating method to parts of the surface layer hardening process called surface heat treatment, known as surface hardening. Including flame heating quenching, high (in) frequency induction heating quenching, laser heating or electron beam heating quenching. Characteristics of these methods are: local heating surface hardening, the workpiece deformation is small; heating speed, high production efficiency; heating time is short, very slight surface oxidation and decarbonization. This method especially under some impact in improving the wear resistance and fatigue strength load effects of large and extra large KOYO bearing parts significantly.

4. Surface Metallurgy strengthening

The use of the surface layer of the metal re-melting and solidification, to give the desired surface composition or organization of strengthening treatment technique called surface metallurgical strengthening. Including the surface from the insoluble alloy or composite powder coating, surface melt crystallization or amorphous, surface alloying method. It characterized by rapid heating using a high energy density, the surface of the metal layer or metal alloying material applied to the surface melting, and then solidified by cooling to obtain their own special structure or specific properties of the reinforcing layer. This particular structure is a crystal structure refinement perhaps, or maybe a supersaturated phase, metastable phase, even non-crystal structure, depending on the process parameters and methods of surface metallurgy. Scroll KOYO KOYO bearing industry in miniature bearing surface laser heating strengthen research done to good effect.

Choose the right fit, you must know the actual load conditions tapered roller bearings, temperature and other requirements, but in fact it is very difficult. Therefore, in most cases it is based on the use of lapping to select fit.