How can I allow imports of bearing steel surface hardening

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Bearing steel used by a lot of bearing enterprises are not good enough, even some of the poor quality bearing steel, thus leading to lower bearing products produced not the same as production enterprises, like bearing, bearing steel are the best quality. However, we are here for everyone to talk about how to make imports of bearing steel surface hardening.
The imported bearing parts work surface and center in the state, structure, and performance requirements are large differences in the overall heat treatment often can not take into account the potential of the material and does not make. Applied Materials, surface hardening technology not only can be used to resolve the differences in the structure and requirements of the surface and center, but also further to the surface to get some special work performance to meet the performance of work under certain conditions bearing on the work surface requirements. This is very meaningful in the development of modern science and technology. Traditional surface hardening methods, process belongs to the category of the heat treatment. Modern laser, electron beam, ion beam surface hardening method developed, not only some high-tech applied to the surf ace of the material to strengthen, and in the process has been beyond the traditional areas of heat treatment, the formation of a new technology. Surface now strengthen the technology from different angles to form a variety of classification, physical and chemical processes to classify surface strengthening technology can be broadly divided into five categories: surface deformation strengthening, surface heat treatment, chemical heat treatment, surface metallurgical strengthening strengthening of the surface film.bearing roller bearings
1 chemical heat treatment
Using some elements of the solid state diffusion infiltration, to change the chemical composition of the metal surface layer, in order to achieve surface hardening method is called chemical heat treatment, also referred to as diffusion heat treatment. Boronizing, the infiltration metal, carburizing and carbonitriding, nitriding and nitrocarb urizing, the sulphurization Sulphonitrocarburizing, nitrocarburizing chromizing, aluminized and chrome aluminum silicon nitrided layer graphitization a wide range of different characteristics. Infiltration of the elements or dissolved in the matrix metal to form a solid solution, or in combination with other metallic elements to form a compound. Short penetrate the elements i.e. change the chemical composition of the surface layer, and can be a different phase structure. The process of carburizing the import bearing steel parts and needle imports bearing sleeve surface nitriding to strengthen strengthen methods of treatment are in this category.thrust roller bearing
2 surface deformation strengthening
So that the metal surface layer is plastically deformed by a mechanical method, to thereby form a hardened layer of high hardness and high strength, such surface strengthening method is called su rface deformation strengthening, also known as work hardening. Including shot blasting, sandblasting, cold extrusion, rolling, cold mill and the impact of the explosion shock. These methods are characterized by: strengthening layer dislocation density increased, the subgrain structure refinement, and thus its hardness and strength, the surface roughness is reduced, can significantly improve the sensitivity of the parts of the surface fatigue strength and reduce fatigue notch. This intensive method is simple, the effect is significant, there is no clear boundaries between the hardened layer and substrate, coherent structure, not easy to fall off in use. Most of its methods have been applied in imports of industrial bearings: the rolling surface impact strengthen is the application of such methods, precision RCC has become the new ferrule processing and enhancement.
3 surface heat treatment
The solid phase change, quenching process referred to as surface heat treatme nt of parts of the surface layer by a rapid heating method, commonly known as the surface hardening. Including flame Frequency Induction Hardening Hardening high (middle), laser heating or electron beam heating quenching. The characteristics of these methods: local Hardening of the surface deformation of the workpiece; heating speed, high production efficiency; heating time is short, very slight surface oxidation and decarbonization. This method is particularly must improve to withstand shock loads of large and extra large import bearing parts wear resistance and fatigue strength of the effect is significant.crossed roller bearing
4. Surface metallurgical strengthening
Re-melting of the workpiece surface layer of metal and solidified, to obtain the expected components or the surface of the tissue enhanced processing technique called surface metallurgical strengthening. Including surface free insolubl e alloy or composite powder coatings, surface melt crystallization or amorphous, surface alloying and other methods. Is characterized by rapid heating using a high energy density, the metal surface layer or coating on the metal surface of the alloying material is melted and solidified to obtain a special structure or the specific properties of the reinforcing layer, followed by their own cooling. This particular structure may be a refinement of the crystal organization, perhaps oversaturated phase, metastable phase, and even non-crystal structure, depending on the the surface metallurgy process parameters and methods. Rolling of imported bearings industry in the surface of the miniature imported bearings work done the laser heating strengthen the research, to good effect.bearing sales
5. Surface film strengthen
Application of physical or chemical methods, the metal surface coating on the reinforcing la yer of the different properties of the matrix material, referred to as surface film strengthening. It includes electroplating, electroless plating (chrome, nickel, copper, silver, etc.) as well as composite plating, brush plating or conversion treatment, are also included in recent years, rapid development of high-tech: CVD, PVD, the P-CVD vapor deposition film enhanced methods and ion implanted surface enhancement technology (also known as atomic metallurgy technology). Their common feature is able to specific properties of thin film is formed on the work surface, in order to strengthen the surface of the wear resistance, fatigue resistance, resistance to corrosion and self-lubricating properties. Such as ion implantation technology to strengthen the the imported bearings work surface, make imports bearing surface wear resistance, corrosion resistance, and resistance to contact fatigue performance has been significantly improved, so that the life of imported bearings to gro w exponentially.