Release bearing material surface strengthening technology classification

Experts explain China imported high temperature bearing material surface hardening technology enterprise classification 1, exterior deformation strengthening metal outer mechanical deformation and plastic deformation, thus forming a high hardness, high strength of hardening layer, the external reinforcement method, called enhanced external deformation, also called work hardening. Including shot peening, sandblasting, cold extrusion, rolling, rolling and impact, such as explosion shock. The characteristics of these methods is the increase of dislocation density, the refinement of structure, hardness and strength increase, reduce external roughness, can significantly improve the external parts fatigue strength, reduce fatigue notch sensitivity. The method is simple, effective, hardening layer and matrix structure, no obvious boundary between connectivity, not easy to use. Many methods have been applied to the imported high temperature bearing industry: by external shocks in rolling element for strengthening method has become a new ring processing method. 2, chemical heat treatment of the solid phase diffusion method for some element diffusion, change the chemical composition of the metal surface, to complete the strengthening method of chemical heat treatment, also known as thermal diffusion. Includes boronizing, carburizing and carbonitriding, nitrogen, carbon altogether permeability, sulfide sulfur nitrogen altogether permeability, chromizing, aluminized silicon, graphitization, etc. Solid solution is through the infiltration of elements or compounds dissolve base metal or with other metal elements. In short chemical composition, the outer element can change, get a different phase structure. Carburized high temperature bearing steel reinforcing treatment process and high temperature iron, imported needle bearing sleeve surface nitriding the reinforcing method. 3, exterior heat treatment of solid phase transformation through the use of quenching treatment of parts heat treatment known as rapid heating the surface of the outside appearance, often referred to as the appearance of the hardening. Including flame hardening, high ( C) Induction hardening, laser hardening or electron beam heating. The characteristics of these methods are: the external part of the quenching workpiece, deformation; Heating speed, high efficiency; Heating time is short oxidation decarburization, the appearance of the very fine. The progress of the method, especially in the large and super large imported bearing under the load of high temperature area is significantly influenced by the abrasion resistance and fatigue strength. 4, membrane appearance improved by physical or chemical teaching way, the metal material appearance of the different reinforcement layer for coating substrate production performance, referred to as the enterprises strengthen the appearance of film. It includes by electroplating, electroless plating, Chromium, nickel, copper, silver, etc. ) And composite plating, the brush plating or conversion process, including China's rapid economic development in recent years to carry out the high technology, such as CVD, PVD, P - CVD and other gas accumulation film can be improved management method and ion injection on their appearance improved information technology ( Also known as an atom of metallurgy professional technology) And so on. Their common function is the film company to whether the staff appearance constitutes specific performance, improved appearance of wear resistance, fatigue resistance, corrosion resistance and the smooth performance of the system. Ion implantation, for example, a large number of imported produce high temperature bearing appearance reinforcement learning technology, can make the import high temperature bearing surface wear resistance, corrosion resistance and contact resistance to fatigue performance have made significant progress, prolong the life of imported high temperature bearing greatly doubled. A: avoid because of the bearing system failure on five kinds of methods: next article no