Measure criteria of ten INA bearing surface treatment technology

1. INA bearing surface deformation strengthening INA bearings by using the method of mechanical plastic deformation in the metal surface, so as to form a hardening layer with high hardness and high strength, this kind of surface strengthening method called surface deformation strengthening, also known as work hardening. Including shot peening, sandblasting, cold extrusion, rolling, cold grinding and impact and explosion shock processing, etc. The characteristics of these methods are: strengthening layer increased dislocation density, the crystal structure refinement, so that the hardness and strength increased, the surface roughness value decreases, and can significantly increase the surface fatigue strength of parts and reduce fatigue notch sensitivity. This process is simple, effective reinforcement method, there is no obvious boundaries between hardening layer and matrix, the coherent structure and not easy to fall off in use. Its most method has been applied in the bearing industry: roller surface strengthening is the application of this kind of method, precision rolling has become a new ring processing and strengthening method. 2. INA bearing surface heat treatment using solid-state phase transformation strengthening INA bearing, surface layer of parts by using the method of rapid heating treatment called surface quenching heat treatment, commonly known as surface hardening. Including flame heating quenching, high ( C) Frequency induction heating quenching, laser heating or electron beam heating quenching, etc. The characteristics of these methods are: local heating surface quenching, workpiece deformation; Heating speed, high production efficiency; Short heating time, the surface oxidation decarburization is very slight. Especially to improve the method under a certain impact load of large and super large bearing parts abrasion resistance and fatigue strength effect is remarkable. 3. INA bearings chemical heat treatment to strengthen an element of solid state diffusion infiltration, to change the chemical composition of the metal surface layer, in order to achieve surface strengthening method called chemical heat treatment to strengthen, also known as diffusion heat treatment. Includes boronizing, metallic cementation, carburizing and carbonitriding, nitriding carbon and nitrogen altogether permeability, ooze sulfur and sulfur nitrogen carbon altogether permeability, chromizing, aluminized and chrome aluminum silicon, graphitization permeability layer and so on, variety and characteristics of each different. Infiltration of elements into matrix metal forming solid solution, or with other metal elements combine to form compounds. Anyhow into elements that can change the surface chemical composition, and can get different phase structure. Carburizing bearing steel parts processing technology and strengthen the surface of the needle roller bearing sets of nitriding processing this kind of reinforcement method. 4. INA bearing surface metallurgy reinforcement of workpiece surface layer metal melting and solidification, in order to get the desired composition or organization of the surface strengthening treatment technology, called surface metallurgy strengthening. Including surface autolyzed alloy or composite powder coating, surface melting crystalline or amorphous processing, such as the surface alloying method. Is characterized by rapid heating using high energy density, the metal surface layer or coating on metal surface alloying material melt, then on their own solidification cooling to get special structure strengthening layer or specific performance. This special structure may be refine crystal organization, also perhaps is supersaturated and metastable phase, even amorphous organization, depending on the process parameters and methods of surface metallurgy. Rolling bearing industry working in the miniature bearing surface laser heating processing research, the result is good. 5. INA bearing surface film to strengthen party INA bearings applied physics or chemistry