Laser quenching technology of the hottest steel an

2022-08-05
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Laser quenching technology of steel and its application

laser quenching technology is a process that uses the focused laser beam to quickly heat the surface of steel materials to make them undergo phase transformation and form martensitic hardening layer. Laser quenching is a clean and fast quenching process with high power density, fast cooling speed and no need of cooling medium such as water or oil

compared with induction quenching, flame quenching and carburizing quenching, laser quenching has uniform hardening layer, high hardness (generally higher HRC than induction quenching), small workpiece deformation, easy control of heating layer depth and heating track, and easy automation. It is not necessary to design corresponding induction coils according to different part sizes as induction quenching, The raised funds will be used to produce 3D printing material parts made of ordinary plastic wastes, and the processing will not be limited by the furnace size during chemical heat treatment such as carburizing and quenching. Therefore, it is gradually replacing traditional processes such as induction quenching and chemical heat treatment in many industrial fields. It is especially 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 the laser hardening layer is generally within the range of 0.3~2.0mm according to the component, size and shape of the part and the laser process parameters

the tooth surface of large gears and the Journal of large shaft parts are quenched, the surface roughness is basically unchanged, and the requirements of actual working conditions can be met 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 rapidly cools the surface of the melting layer and solidifies and crystallizes due to the internal heat conduction cooling of the substrate. The microstructure obtained by melt quenching is very dense. The microstructure along the depth direction is melt solidification layer, phase transformation hardening layer, heat affected zone and substrate. The laser melting layer has a deeper hardening depth, higher hardness and better wear resistance than the laser quenching layer of distribution cabinets and various large electrical appliances after routine inspection. The disadvantage of this technology is that the surface roughness of the workpiece 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 and shear blades. It 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

characteristics of laser quenching

quality advantages technical characteristics applicable to practical application of materials

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

2. almost no damage to surface roughness adopts anti-oxidation protection thin coating die steel various dies

3. laser quenching does not crack accurate quantitative numerical control quenching cold working die steel dies and cutting tools

4 CNC quenched medium carbon alloy steel shock absorber with accurate groove quenching location

5. laser quenching is clean and efficient. No cooling medium such as water or oil is required for cast iron engine cylinder

6. the quenching hardness is higher than that of conventional methods. The microstructure of quenching layer is fine, but its performance cannot meet the requirements of rubber tensile test High carbon alloy steel large roll with good strength and toughness

laser quenching equipment

● laser

hgl-v 5kW cross flow CO 2 laser with maximum output power of 5.5kW

● large multi-functional processing machine tool

the basic dimension range of laser processing machine tool is: length 5.5m, diameter Φ 2.6 M. For special workpiece, the size range that can be machined is larger. The laser processing machine is a double cantilever processing system, which can carry out multi station laser processing

● six axis four linkage numerical control system

the machine tool is equipped with a six axis four linkage numerical control system, which can carry out precision laser processing on workpieces with complex shapes

industrial application examples of laser quenching

laser quenching technology can strengthen the surface of various guide rail, large gear, journal, cylinder inner wall, mold, shock absorber, friction wheel, roll and roller parts. Applicable materials are medium and high carbon steel and cast iron. Application example of laser quenching: the hardness of cast iron engine cylinder strengthened by laser quenching is increased from hb230 to hb680, and the service life is increased by 2~3 times. (end)

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