There are great differences between the working surface and the core of bearing parts in terms of state, structure and performance Surface Treatment requirements, but the overall heat treatment can not be taken into account, and the potential of materials can not be brought into full play.
The application of material surface strengthening technology can not only better solve the differences in structure and requirements between the surface and the core, but also further make the surface obtain some special working properties, so as to meet the requirements of bearings working under specific conditions.
This is of great significance in the development of modern science and technology. The traditional surface strengthening method belongs to the category of heat treatment. The Surface Treatment surface strengthening methods such as laser,
electron beam and ion beam developed in modern times not only apply some high and new technologies to the surface Surface Treatment strengthening of materials, but also go beyond the scope of traditional heat treatment and form a new technical field.
Therefore, the current surface strengthening technology can form a variety of classification methods from different angles. According to the Surface Treatment physical and chemical process of surface strengthening technology, it can be roughly divided into five categories:
surface deformation strengthening, surface heat treatment strengthening, chemical heat treatment Surface Treatment strengthening, surface metallurgy strengthening and surface film strengthening.
The metal surface layer is plastically deformed by mechanical methods to form a hardened layer with high Surface Treatment hardness and high strength. This surface strengthening method is called surface deformation strengthening,
also known as work hardening. Surface Treatment Including shot blasting, sand blasting, cold extrusion, rolling, cold rolling and impact, explosion impact strengthening, etc.
The characteristics of these methods are: the strengthening layer Surface Treatment dislocation density increases and the sub crystal structure is refined, so as to improve its hardness and strength and reduce the surface roughness value,
which can significantly improve the surface fatigue strength of parts and reduce the sensitivity of fatigue notch. This strengthening method has the advantages of simple process and remarkable effect. There is no obvious boundary between the hardened layer and the matrix, the structure is coherent, and it is not easy to fall off in use.
Most of its methods have been applied in the bearing industry: the surface impact strengthening of Surface Treatment rolling element is the application of this kind of method, and precision rolling has become a new ferrule processing and strengthening method.
Including flame heating quenching, high (medium) frequency induction heating quenching, laser heating or electron beam heating quenching, etc. The characteristics of these methods are: local heating and quenching of the surface, small deformation of the workpiece;
Fast heating speed and high production efficiency; The heating time is short, and the surface oxidation decarburization is very slight.
1) continuous vacuum dryer, which is developed from the characteristics of spray drying and freeze-drying. The working process is carried out in a low-temperature environment. The dry environment should maintain a low-temperature state.
First, the equipment itself should be equipped with high-performance cooling parts. Second, the heat dissipation performance of the equipment itself is better, which requires that the performance of the bearing must meet the requirements of low-temperature resistance and high heat dissipation.
2) Vacuum disc continuous dryer is mainly used to dry heat sensitive materials, and its drying process is carried out under negative pressure. In the processing process, due to the different space pressure,
the equipment may have a small amount of expansion and contraction changes, which will have a great impact on the equipment components for a long time, which requires the bearing to have higher toughness and the performance that the clearance can be adjusted freely in a small range.
To ensure that the above performance bearing products are purchased, it is necessary to further understand the bearing code interpretation.
3) Double cone rotary vacuum dryer is mainly used to dry powder, granular and fibrous materials. According to these dry materials, it can be judged that the working environment is dirty and there is a lot of floating dust, which requires high dust-proof performance of the bearing.
Another is the mechanism of the equipment itself. This model adopts two-stage elastic connection mode of belt / chain, so the equipment operates stably. In order to achieve high-speed and stable operation of the equipment, the rotating parts are better to choose bearings.