Process and advantages of laser quenching technology

Laser quenching is one of the new scenarios of applying laser technology. This method is mainly used to locally and rapidly heat the material surface by laser to achieve the purpose of strengthening the material surface. It is mainly used for metal materials. The surface hardness, wear resistance, corrosion resistance and other properties of the quenched material will be improved to varying degrees, and the service life will also be significantly improved.laser cutting

Since laser quenching is called laser quenching and hardening, its theoretical basis is the law of interaction between laser and materials. There are mainly three processes, namely, laser melting and solidification hardening, laser shock hardening and laser phase transformation hardening. The difference between the three processes mainly lies in the difference of laser power and excitation energy density, and is related to the laser action time.

Laser quenching can play a more significant role in the following scenarios:

1. Large workpieces difficult to enter the heat treatment furnace.
2. The workpiece only needs to be heat treated on the local surface such as groove, groove, hole, edge and edge.
3. Parts difficult to be treated by conventional heat treatment process.
4. Precision parts with high requirements for heat treatment deformation.
5. Heat treatment of cast iron workpiece surface.
6. Parts prone to crack by conventional heat treatment process.
7. Parts whose hardness requirements cannot be met by conventional heat treatment process.

Of course, laser quenching is a kind of laser technology. Laser quenching naturally has some advantages. As a fast non-contact processing, no external quenching medium is required during laser quenching, and the workpiece deformation is small and the cooling speed is fast. Compared with traditional flame quenching, carburizing quenching and other technologies, laser quenching does not require external media such as water or oil for cooling, and uses high-density laser for rapid heating, with fewer processes and faster speed. From the quenching results, the hardened layer of laser quenching is uniform, and the hardness is 15-20% higher than that of conventional quenching.
At the same time, due to the existence of the laser control system, the depth and trajectory of the laser quenching heating layer are simple and controllable, the operation is convenient, the process change can be quickly adjusted, the flexibility is good, and the degree of automation is high. At the same time, with the support of the control system, the laser direction changes flexibly, and the laser quenching can also achieve the goal well in the face of difficult to go deep into the material inner hole groove or complex high-precision parts.
Laser quenching has solved many problems that cannot be solved by traditional processes. It has been widely used in many industries such as metallurgy, mold, hardware, automobile, kitchen utensils, machinery manufacturing, etc., especially in the service life of vulnerable parts such as rollers, guides, gears, shear blades, etc. the effect is remarkable and great economic and social benefits have been achieved.