The influence of surface treatment on the performance of the bearing

Bearing parts work surface and center in the state, there is a large difference in structure and performance requirements, and the overall heat treatment often make not, give attention to two or morethings material it is hard to give full play to their potential. Applied materials surface strengthening technology can not only solve the surface and center differences in structure and requirements, but also can make further surface to obtain specific performance, in order to meet the work under certain conditions on the properties of working surface of bearing requirements. This makes sense in the modern science and technology development. On the traditional method of surface strengthening technology belongs to the category of the heat treatment. And developed the modern laser and electron beam and ion beam surface strengthening method, not only will some high and new technology applied in the material surface strengthening, and in the process is beyond the traditional heat treatment category, form the new technology. So the surface strengthening technology can be classified from different Angle to form a variety of methods, according to the chemical and physical process of surface strengthening technology classification, can be roughly divided into five categories: surface deformation strengthening heat treatment, surface strengthening, the chemical heat treatment, surface metallurgy strengthening, film surface strengthening. By mechanical method of 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. Using solid-state phase transformation, 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. 1) Continuous vacuum dryer, it is the characteristic of structure, spray drying and freeze drying, the comprehensive development. Its working process is under the low temperature environment, dry environment must keep low temperature condition, the equipment itself should be equipped with high performance cooling parts, the second is the device itself can better cooling line, which requires the bearing must meet the performance of the low temperature resistance, high heat dissipation. 2) Vacuum pan continuous drying machine mainly to dry heat-sensitive materials, the drying process is conducted under negative pressure. Machining process, because the difference in the pressure of the space, equipment may appear trace increases and changes, the long down will have a big impact on equipment parts, which requires the bearing has a higher toughness, clearance can be adjusted small free performance. Be sure to buy the above performance bearing products, will explain bearing code for further understanding. 3) Double cone rotating vacuum drying machine, mainly for powder, granular and fibrous materials for drying process. According to the dry material can determine its work environment is dirty, dust, which requires the higher bearing dustproof performance. Then there is the device itself, it is to use the belt/chain two-stage elastic coupling way, so equipment running smoothly, to equipment high-speed running smoothly, it is best to choose the bearing rotating parts.