In understanding the bearing manufacturing process, it is usually found that the bearing will harden the material surface, which can strengthen the bearing surface and make the bearing material surface beautiful and smooth. The surface hardening technologies of bearing steel materials are divided into the following five categories. Let’s explain these five types of surface hardening technologies in detail.
Class 5 Surface Hardening Technology of Imported Bearing Materials
1. Chemical heat treatment
Using solid phase diffusion to some elements to change the chemical composition of metal surface layer, in order to realize surface strengthening, it means strengthening chemical heat treatment, also known as thermal diffusion. Including boronizing, carburizing, carbonitriding, nitriding and nitrocarburizing, graphitization layer, etc. Infiltrating elements or dissolving into the base metal to form a solid solution, or forming compounds with other metal elements can change the elements of the surface layer and obtain different phase structures bearing.
The strengthening process of carburized bearing steel and the surface of Timken imported needle roller bearing sleeve are nitrided.Class 5 Surface Hardening Technology of Imported Bearing Materials
2. Surface deformation strengthening
The metal surface layer is deformed mechanically and plastically to form a hardened layer with high hardness and high strength. The surface strengthening method is called enhanced surface deformation (also known as work hardening). Including shot blasting, sand blasting, cold extrusion, rolling, rolling and impact, explosion impact, etc.
The characteristics of these methods are: strengthening the increase of dislocation density and the refinement of structure, increasing its hardness and strength and reducing the surface roughness, which can significantly improve the surface fatigue strength of parts and reduce the fatigue notch sensitivity.
This reinforcement method has the advantages of simple process, remarkable effect, hardening layer and matrix structure, no obvious boundary between continuity and not easy to fall off.Class 5 Surface Hardening Technology of Imported Bearing Materials
3. Surface heat treatment
The use of solid-state phase transformation and quenching treatment of parts is called surface heat treatment, and the surface layer is rapidly heated (commonly known as surface hardening). Including flame quenching, laser heating or electron beam heating quenching. These methods are characterized by local surface quenching and small workpiece deformation; Fast heating speed and high production efficiency;
The heating time is short, and the surface oxidation and decarburization are very slight. This method is especially used to improve the wear resistance and fatigue strength of large and super large imported bearings under obvious impact load.Class 5 Surface Hardening Technology of Imported Bearing Materials
4. Surface metallurgical strengthening
The melting and solidification of metal surface layer is surface metallurgical strengthening in order to obtain the composition or structure of the expected surface strengthening technology.
It includes surface autolytic alloy or composite powder coating, surface melting, crystallization or amorphous treatment, and surface alloying. Rapid heating with high energy density, melting of metal surface layer or coating alloy material, followed by strengthening cooling and curing to obtain special structure or specific properties.Class 5 Surface Hardening Technology of Imported Bearing Materials
5. Membrane surface strengthening
Using physical or chemical methods, the properties of substrate materials with different reinforcement layers are coated on the metal surface, which is called reinforced surface film.
It includes electroplating, electroless plating (chromium, nickel, copper, silver, etc.) and composite electroplating, brush plating or conversion processes, including high technologies that have developed rapidly in recent years, such as CVD, PVD, p-cvd and other vapor deposition film strengthening methods and ion implantation surface strengthening technology (also known as atomic metallurgy Technology).
The surface strengthening technology of ion implantation imported bearing can significantly improve the wear resistance, corrosion resistance and contact fatigue resistance of the imported bearing surface, and double the service life of the imported bearing.Class 5 Surface Hardening Technology of Imported Bearing Materials
With the development of society, the progress of the times and the improvement of people’s living standards; Gradually, people also like to travel abroad and use imported things, and linear bearings are no exception.
So, what is the difference between the imported linear bearing from ina in Germany and our domestic linear bearing? Today, let’s take a look at the difference between them and why people like imported things more and more!Class 5 Surface Hardening Technology of Imported Bearing Materials
1. Differences in models
With the advent of internationalization, domestic bearing codes are gradually in line with imported bearing codes. The newly published national standards show that domestic codes are basically consistent with international ISO standards.Class 5 Surface Hardening Technology of Imported Bearing Materials
The marks on bearings, such as the famous domestic bearings, that is, Harbin bearing code (HRB) and Luoyang shaft code (LYC), are basically like this. In addition to the digital code indicating the bearing model, each bearing has Pinyin marks representing the place of origin. If you are a person from the machinery industry, you should know.Class 5 Surface Hardening Technology of Imported Bearing Materials
In terms of service life, although the service life of imported bearings is longer than that of domestic bearings, domestic bearings can be used if the precision requirements of ordinary machines are not very high.
At present, the bearings produced by large domestic manufacturers such as HRB and ZWZ are of good quality, the price is appropriate and can be used, but they are better imported when the accuracy is required.Class 5 Surface Hardening Technology of Imported Bearing Materials
Compared with domestic bearings, imported bearings generally have better materials than domestic ones. The heat treatment process is more advanced than domestic ones, with high manufacturing accuracy. The manufacturing and assembly process is more reasonable, but the service life is long. Of course, the price is also higher. And imported bearings are generally more genuine. Another important point is that it is not marked in Chinese, and many people may not understand it.
This is the difference between German ina imported linear bearings and domestic linear bearings, so imported things certainly have their advantages.Class 5 Surface Hardening Technology of Imported Bearing Materials