Imported bearing material surface hardening technology of classification

We know in bearing manufacture process, often find bearing will be on the material surface hardening, so that we can strengthen the bearing surface, and make the bearing surface is beautiful, smooth, etc. The bearing small plait share is mainly about bearing steel material surface hardening technology of classification, the main is divided into: chemical heat treatment, surface deformation strengthening, surface heat treatment, surface metallurgy strengthening and classification of membrane surface strengthening five kinds of technology. 1, chemical heat treatment of solid phase diffusion to some elements, change the chemical composition of the metal surface layer, in order to achieve the method of surface strengthening said to strengthen the chemical heat treatment, also known as thermal diffusion. Includes boronizing, permeability, carburizing and carbonitriding, nitriding carbon and nitrogen altogether permeability, sulfide and sulfur nitrogen carbon altogether permeability, permeability of chromium, aluminum and silicon infiltration, graphitization layer and so on, varieties, characteristics. Infiltration of elements into matrix metal forming solid solution, or with other metal elements to form compounds. In a short chemical composition, can change the surface elements, can be different phase structure. Carburizing bearing steel reinforcement process and iron, Ken import needle bearing sleeve nitriding surface of the reinforcement method. 2, the surface deformation strengthening with mechanical method and the plastic deformation of metal surface, forming a high hardness and high strength of hardening layer, surface strengthening method called enhanced surface deformation, also known as work hardening. Including shot peening, sandblasting, cold extrusion, rolling, rolling and impact, such as explosion shock. The characteristics of these methods are: to strengthen the dislocation density increases, the structure refinement, make its hardness and strength increase, the surface roughness is reduced, can significantly increase the surface fatigue strength of parts, reduce fatigue notch sensitivity. This reinforcement method has simple process, the effect significantly, there are hardening layer and matrix structure, no obvious boundary between coherence, fall off not easily, use. Many of the method has been applied to the imported bearing industry: application of surface impact method of strengthening the rolling body, precision rolling into ring processing new strengthening method. Three, surface heat treatment using solid-state phase transformation of parts of quenching treatment, called surface heat treatment of rapid heating surface, commonly known as hardening of the surface. Including flame hardening, high ( C) High frequency induction heating quenching, laser heating or electron beam heating quenching. The characteristics of these methods are: partial surface quenching, workpiece deformation; Heating speed, high production efficiency; Short heating time, the surface oxidation and decarburization is very slight. Especially in improving the method of large and super large imported bearing parts obviously under the action of impact load abrasion resistance and fatigue strength. 4, surface metallurgy strengthening surface layer of metal melting and solidification, in order to obtain the desired surface strengthening technology of surface metallurgy strengthening ingredients or organization. Include autolyzed alloy on the surface or composite powder coating, surface melting crystalline or amorphous processing, surface alloying method. With high energy density of rapid heating, the metal surface layer or coating alloy molten metal surface, the second is to strengthen cooling solidification, get special structure or specific performance. This special structure or crystal structure refinement, also perhaps is supersaturated phases, metastable phase, even is the crystal structure, according to the different process parameters and surface metallurgy method. Work in miniature imported bearings rolling bearing industry laser heating surface strengthening research, good results. 5, the membrane surface strengthening by physical or chemical method, for different reinforcement in the metal surface coating layer of the substrate material performance, known as the enhanced surface film. It includes electroplating, electroless plating, Chromium, nickel, copper, silver, etc. ) And composite plating, the brush plating or conversion process, including in recent years the rapid development of high technology, such as CVD, PVD, P - CVD and other vapor deposition film strengthening method and ion implantation surface strengthening technology ( Also referred to as the atomic metallurgy technology) And so on. Their common characteristic is the film can form specific performance in the work surface, improve the surface wear resistance, fatigue resistance, corrosion resistance and self-lubricating properties. Ion implantation, for example, imported bearing surface strengthening technology, can make import bearing surface wear resistance, corrosion resistance, resistance to contact fatigue performance has improved significantly, and prolong the life of imported bearing doubled. 【 Warm prompt. 【 The bearing network] Some information from the Internet, and strive to secure timely, accurate, aims to deliver more information, does not represent our views to its approval or responsibility for their authenticity. If this net reprint information involves the issues such as copyright, please contact with this net. Tel: 0571 - 81630205. Tags: bearing material