External treatment strengthening skills: bearing steel appearance reinforcement method

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External treatment strengthening skills: bearing steel appearance reinforcement method

Source: China Bearing Network Time: 2014-07-06
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The appearance and layout of the bearing parts and the heart are quite different in terms of condition, layout and functional requirements. In addition, the overall heat treatment often makes it impossible to co-ordinate, and the potential of the data is not fully utilized. It can better deal with the difference in layout and demand between the appearance and the heart, and can further make the appearance obtain some special operation functions to satisfy the demand of the bearing function for the operation under certain conditions. This is modernized. It is often meaningful to have a right or wrong in the development of scientific skills.
The traditional method of external reinforcement; the process is attributed to the field of heat treatment. The laser, electron beam, ion beam and other external reinforcement methods carried out in modern times; not only some high-tech skills are applied to the appearance enhancement of the data; and the process has now exceeded The traditional field of heat treatment; constitutes a new skill field. Therefore, today's appearance reinforcement skills can form a variety of classification methods from different viewpoints; classification according to the physical and chemical processes of surface reinforcement skills; roughly divided into five categories: External deformation strengthening, external heat treatment strengthening, chemical heat treatment strengthening, surface metallurgical strengthening, surface film strengthening.
1. The external deformation strengthening mechanically deforms the metal outer surface; then forms a hardened layer with high hardness and high strength; this external strengthening method is called external deformation strengthening; also known as work hardening. It includes shot blasting, sand blasting, Cold extrusion, rolling, cold rolling and impact, blasting impact strengthening, etc. These features are characterized by: increased dislocation density of the strengthening layer; finening of the subgrain layout; then the hardness and strength are improved; the surface roughness value is reduced.芟 岣 岣 岣 慵 慵 颓慷 颓慷 颓慷 颓慷 颓慷 腿 腿 腿 腿 腿 腿 腿 腿 腿 腿 腿 腿 腿 腿 腿 腿 腿 腿 腿 这种 这种 这种 这种 这种 这种 这种 这种 这种 这种 这种 这种 这种 这种 这种 这种 这种 这种 这种It has been used in the bearing industry. Most of its methods have been used in the bearing industry: the external impact of the rolling body is the application of such methods; fine rolling has become a new method of ferrule processing and strengthening.
2. External heat treatment strengthens the use of solid phase transformation; quenching of the outer surface of the part by rapid heating is called external heat treatment; commonly known as external quenching. It includes flame heating quenching, high (medium) frequency induction heating quenching, laser heating or Electron beam heating quenching, etc. The characteristics of these methods are: the external part is heated and quenched; the workpiece is deformed. The person is especially stunned by the 俣瓤欤 撸 撸 撸 撸 撸 芮嵛 芮嵛 芮嵛 芮嵛 芮嵛 芮嵛 芮嵛 芮嵛 芮嵛 芮嵛. The wear resistance and fatigue strength of large and extra large bearing parts with a certain impact load are obvious.
3. Chemical thermal treatment enhances the use of solid dispersion of certain elements; changes the chemical composition of the outer surface of the metal; the method of completing the external reinforcement is called chemical thermal treatment strengthening; also known as dispersive heat treatment. Contains boronizing, metalizing, Carburizing and carbonitriding, nitriding and nitrocarburizing, sulfurizing and sulfur-nitrocarburizing, chromizing, aluminizing and chrome-aluminum-silicon co-infiltration, graphitized layer, etc.; variety and characteristics Entering elements or dissolved into the matrix metal to form a solid solution; or in combination with other metal elements to form a compound. The total element can change the chemical composition of the outer layer; and can obtain different phase layout. The treatment process of carburized bearing steel parts and The external surface nitriding enhanced treatment of the needle bearing sleeve belongs to this type of strengthening method.
4. Surface metallurgical strengthening using de novo ablation and condensation of the outer surface of the workpiece metal; to obtain the expected composition or arrangement of the surface strengthening treatment skills called surface metallurgical strengthening. Including surface auto-dissolving alloy or composite powder coating, surface ablation crystal or amorphous state Disposal, external alloying, etc. The characteristic is to use high-energy density rapid heating; melt the metal outer surface or the alloying data coated on the metal surface; then cool it by self-cooling to obtain special layout or specific function strengthening. Layer. This particular layout may be a refinement of the crystal arrangement; it may also be a supersaturated phase, a metastable phase, or even a right or wrong crystal arrangement; this depends on the process parameters and methods of surface metallurgy.
Rolling bearing professional has done laser heating intensification research on the surface of miniature bearing operation; outstanding effect.
5. The outer film is strengthened by physical or chemical methods; the outer surface of the metal is coated with a different layer of reinforced film; it is called outer film strengthening. It contains electroplating, electroless plating (chrome plating, nickel plating, copper plating, silver plating). Etc.) and composite plating, brush plating or conversion treatment; also includes high-tech skills that have been developed in these years: gas-phase stacking film strengthening methods such as CVD, PVD, P-CVD, and ion implantation surface strengthening skills (also known as atomic metallurgy skills). ) and so on. They are characterized by a film that can form a specific function on the outside of the work; to enhance the appearance of wear resistance, fatigue resistance, corrosion resistance and self-lubricating functions. For example, ion implantation skills enhance the appearance of bearing operations; The wear resistance, corrosion resistance, and anti-touch fatigue function of the bearing work have been significantly improved; then the service life of the bearing has been doubled.
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