Classification and detailed introduction of fag imported bearing surface strengthening

Although the material of fag imported bearing steel is very good, the working surface and core of fag imported bearing parts are quite different in terms of state, structure and performance requirements, and the overall heat treatment often makes it impossible to balance the potential of the material. Not fully utilized. Therefore, it is necessary to strengthen the surface of the fag imported bearing steel to adapt it to more situations.
Surface strengthening technology can form a variety of classification methods from different angles. According to the physical and chemical processes of surface strengthening technology, it can be divided into five categories: surface deformation strengthening, surface heat treatment strengthening, chemical heat treatment strengthening, surface metallurgy strengthening, surface film. strengthen.
1. Deformation of surface deformation of fag bearing The plastic surface layer is plastically deformed by mechanical means to form a hardened layer of high hardness and high strength. This surface strengthening method is called surface deformation strengthening, also called work hardening. Including shot peening, sand blasting, cold extrusion, rolling, cold rolling and impact, explosion shock strengthening. Most of its methods have been applied in the fag bearing industry: the surface impact strengthening of rolling elements is the application of such methods, and precision rolling has become a new method of ferrule processing and strengthening.
2, fag bearing surface heat treatment enhancement Using solid phase transformation, quenching the surface layer of the part by rapid heating method is called surface heat treatment, commonly known as surface quenching. Including flame heating quenching, high (medium) frequency induction heating quenching, laser heating or electron beam heating quenching. The characteristics of these methods are: local surface heating and quenching, small deformation of the workpiece; fast heating speed, high production efficiency; short heating time, surface oxidative decarburization is very slight. This method is particularly effective in improving the wear resistance and fatigue strength of large and extra large fag bearing parts subjected to a certain impact load.
3, fag bearing chemical heat treatment strengthening The use of solid diffusion infiltration of a certain element to change the chemical composition of the metal surface layer to achieve surface strengthening is called chemical heat treatment strengthening, also known as diffusion heat treatment. The treatment process of carburized fag bearing steel parts and the surface nitriding strengthening treatment of needle roller fag bearing sleeves belong to this type of strengthening method.
4, fag bearing surface metallurgical strengthening The use of surface re-melting and solidification of the surface layer of the workpiece to obtain the desired composition or tissue surface strengthening treatment technology called surface metallurgy strengthening. Including surface auto-dissolving alloy or composite powder coating, surface melting crystallization or amorphous treatment, surface alloying and the like. The rolling fag bearing industry has done research on laser heating enhancement on the working surface of miniature fag bearings with good results.
5, fag bearing surface film strengthening Applied physical or chemical methods, the surface of the metal coated with a different layer of reinforced film properties, called surface film strengthening. It includes electroplating, electroless plating (chrome plating, nickel plating, copper plating, silver plating, etc.) as well as composite plating, brush plating or conversion treatment, etc. It also includes high-tech developments such as CVD, PVD, P-CVD, etc. Vapor deposition film strengthening method and ion implantation surface strengthening technology (also called atomic metallurgy technology) and the like. Their common feature is that they can form a film with specific properties on the working surface to enhance the surface wear resistance, fatigue resistance, corrosion resistance and self-lubricating properties. For example, ion implantation technology strengthens the bearing working surface, which can significantly improve the wear resistance, corrosion resistance, and contact fatigue resistance of the bearing working surface, so that the service life of the bearing is doubled.