Die steel laser quenching technology
Die steel quality advantages of technical characteristics applicable to the practical application of materials
1. Quenching parts are not deformed Laser quenching thermal cycling Fast carbon steel large shaft
2. Almost no damage to the surface roughness with anti-oxidation protection coating thin steel mold steel
3. Laser quenching does not crack precise quantitative CNC cold work die steel die steel, cutting tools
4. On the local, groove, groove quenching precise positioning of carbon steel quenching medium damper
5. Laser quenching Clean, efficient Does not require water or oil Cooling medium Cast iron material Engine cylinder
Laser quenching technology is the use of focused laser beam rapid heating of the surface of steel materials, so that the phase transition occurs, the formation of martensite hardened layer process. Mold steel laser quenching high power density, cooling speed, do not need water or oil cooling medium, is a clean, fast quenching process.
Compared with induction hardening, flame hardening and 100121dzmgz carburizing and quenching, the hardened layer of the laser quenching is even and has high hardness (generally 1-3HRC higher than that of the induction hardening), the deformation of the workpiece is small, the depth of the heating layer and the heating track are easy to control Automation eliminates the need for inductive coils to be dimensioned according to different parts as induction hardening does and does not require the processing of large parts to be limited by the size of the furnace during chemical heat treatment such as carburizing and quenching. Therefore, in many industrial fields, induction hardening and Chemical heat treatment and other traditional processes. It is especially important that the deformation of the workpiece before and after laser quenching is almost negligible, making it particularly suitable for the surface finish of parts requiring high precision. The depth of laser hardened layer in accordance with the parts composition, size and shape and laser process parameters are different, generally in the range of 0.3 ~ 2.0mm.
Large gear tooth surface, large shaft parts of the journal quenching, surface roughness remains unchanged, do not need follow-up machining to meet the needs of the actual working conditions. Laser fusion quenching technology is the use of laser beam to the substrate surface heated to above the melting temperature, due to the substrate within the cooling and cooling the molten layer surface rapid cooling and solidification crystallization process. The obtained fused-quenched microstructures were very dense and the microstructures along the depth direction were melted-solidified layer, phase-change hardened layer, heat-affected zone and substrate. The laser cladding layer harder than the laser hardening layer depth, hardness, wear resistance is better. The inadequacies of this technology is that the roughness of the surface of the workpiece is damaged to a certain extent, generally requiring follow-up machining to recover. In order to reduce the surface roughness of the parts after laser fusion treatment and reduce the subsequent processing volume, Huazhong University formulated a special laser fused quenching coating, which can greatly reduce the surface roughness of the fused layer.
Now laser cladding of metallurgical materials such as rolls, guides and other parts, the surface roughness has been close to the level of laser quenching. Laser quenching has been successfully applied to the surface strengthening of wearing parts in the metallurgical industry, machinery industry and petrochemical industry, especially in improving the service life of wearing parts such as rollers, guide weaves, gears and scissors blades, etc., Has made great benefits and social benefits. In recent years, mold steel, gears and other parts surface hardening has also been more widely used.
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