Working surfaces of bearing components and the Center in the State, is there a large difference between structure and performance requirements, while heat treatment is often not taken into account as a whole, also fail to bring into full play the potential of the material. Applied materials surface strengthening technology not only can be better addressed and differences in the structure and requirements of the Department, but also further the surface properties of some special work to meet specific conditions bearing on the working surface of performance requirements. This is very significant in the development of modern science and technology. Traditional methods of surface hardening, outside the scope of the heat treatment on the process. Modern development of laser, electron beam, ion beam surface hardening method, not only some of the high-tech application in surface hardening of the material, and is beyond the scope of conventional heat treatment in the process, formed a new area of technology. Thus surface hardening technology of multiple classification methods can be formed from a different angle, classified by physico-chemical processes of surface hardening technology, can be divided into five main categories: surface deformation strengthening, surface treatment hardening, surface metallurgical chemical heat treatment intensification, strengthening, thin film on the surface hardening.
Plastic deformation of metal surface layer by mechanical methods, creating a high hardness and high strength hardened layers, surface deformation strengthening of this surface strengthening method is called, also called work hardening. Includes blasting, sand blasting, cold extrusion, rolling and shock, cold shock, explosion. These methods are characterized by: strengthening the dislocation density increases, and crystal structure refinement, so that its hardness and strength, surface roughness values decrease, can significantly improve fatigue strength of parts and reduce the fatigue notch sensitivity. This enhanced process is simple and effective, hardened layer and there are no clear boundaries between the substrate and structure consistency, easy in use fell off. Most of its methods are applied in the bearing industry: rolling surface impacts of intensive is the application of such methods, precision rolling and strengthening method of machining has become a new ring.
Workpiece surface layer of metal melting and solidifying again, to achieve the desired component or organization strengthening of surface hardening treatment technology called surface metallurgy. Including the apparently insoluble alloy or compound melting crystalline or amorphous powder coating, surface treatment, surface alloying and other methods. Is characterized by rapid heating of high energy density, metal surface layer or coating on metal surface alloying materials melt, followed by a solidification cooling on its own to get the special structure or specific properties of strengthened layer. This particular structure, perhaps a refinement of crystal structure, perhaps it is the supersaturation, metastable phase, and even non-texture, depending on the process parameters of surface metallurgy and method. Working surface of rolling bearing industry in miniature bearings done laser heated strengthening research to good effect.



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