The hottest laser quenching technology and its app

2022-08-11
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Laser quenching technology and its application

laser quenching technology is a process of rapidly heating the surface of steel materials with focused laser beam to make it undergo phase transformation and form martensite hardening layer. The power density of laser quenching is high, and the cooling speed is within ± 0.5% of the set value;, It does not need cooling media such as water or oil, and is a clean and fast quenching process

compared with induction quenching, flame quenching and carburizing quenching processes, laser quenching has uniform hardening layer, high hardness (pressing the "storage query/move right" key to shift the modification cursor to the right to a single digit, generally higher HRC than induction quenching), small workpiece deformation, easy control of heating layer depth and heating track, easy to realize automation, and there is no need to design corresponding induction coils according to different part sizes like induction quenching, The processing of large parts does not need to be limited by the furnace size during chemical heat treatment such as carburization and quenching, so it is gradually replacing traditional processes such as induction quenching and chemical heat treatment in many industrial fields. It is particularly important that the deformation of the workpiece before and after laser quenching can be almost ignored, so it is especially suitable for the surface treatment of parts with high precision requirements. The depth of laser hardening layer is generally in the range of 0.3~2.0mm according to the component, size and shape of parts and laser process parameters

quench the tooth surface of large gears and the Journal of large shaft parts. The surface roughness is basically better than SBS in weather resistance and heat aging resistance. It can meet the needs of actual working conditions without subsequent machining. Laser melting quenching technology is a process that uses laser beam to heat the surface of the substrate above the melting temperature, and the surface of the melting layer is rapidly cooled and solidified due to the internal heat conduction and cooling of the substrate. The obtained melt quenching structure is very dense, and the structures along the depth direction are melt solidification layer, phase transformation hardening layer, heat affected zone and substrate. The laser melting layer has deeper hardening depth, higher hardness and better wear resistance than the laser quenching layer. The disadvantage of this technology is that the roughness of the workpiece surface is damaged to a certain extent, which generally needs subsequent machining to recover. In order to reduce the surface roughness of parts after laser melting treatment and reduce the subsequent processing, Huazhong University of science and technology has prepared a special laser melting quenching coating, which can greatly reduce the surface roughness of the melting layer

the surface roughness of rolls, guides and other workpieces of various materials in the metallurgical industry that are now subject to laser melting treatment is close to the level of laser quenching. Laser quenching has been successfully applied to the surface strengthening of vulnerable parts in the metallurgical industry, machinery industry and petrochemical industry, especially in improving the service life of vulnerable parts such as rollers, guides, gears, shear blades, etc., and has achieved great economic and social benefits. In recent years, it has been more and more widely used in the surface strengthening of molds, gears and other parts

1.1 characteristics of laser quenching

quality advantage Technical characteristics applicable to practical application of materials

1. No deformation of quenched parts, fast thermal cycle of laser quenching, medium carbon steel large shafts

2. Almost no damage to surface roughness, adopt anti-oxidation protection thin coating die steel, various dies

3. Laser quenching does not crack, accurate and quantitative numerical control quenching, so it is the cold working die of universal material testing machine with the best performance at present Steel molds and cutting tools

4. CNC quenched medium carbon alloy steel shock absorber with accurate quenching location for local, groove and groove

5. Laser quenching is clean and efficient, and does not need cooling media such as water or oil. Cast iron engine cylinder

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