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Laser quenching

  • Categories:Industry news
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  • Time of issue:2020-07-27 09:33
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(Summary description)

Laser quenching

(Summary description)

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2020-07-27 09:33
  • Views:
Information

Definition:

Laser quenching of tooth surface has the advantages of high heating and cooling speed, short process cycle and no need of external quenching medium. It has the advantages of small deformation of workpiece, clean working environment, no need of gear grinding after treatment, and the size of processed gear is not limited by heat treatment equipment size

1.1 quality advantages

Laser quenching has the advantages of 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 1-3hrc higher than induction quenching), small deformation of workpiece, easy control of heating layer depth and heating track, and easy automation. It does not need to design corresponding induction coil according to different parts size as induction quenching, and the processing of large parts does not need to be affected Because of the limitation of furnace size in chemical heat treatment such as carburizing and quenching, traditional processes such as induction quenching and chemical heat treatment are gradually replaced in many industrial fields. It is particularly important that the deformation of the workpiece before and after laser quenching can be ignored, so it is especially suitable for the surface treatment of high-precision parts.

1.2 technical characteristics

The depth of laser hardened layer varies from 0.3 mm to 2.0 mm according to the composition, size and shape of the parts and laser process parameters. After quenching the tooth surface of large gear and the Journal of large shaft parts, the surface roughness is basically unchanged, which can meet the requirements of actual working conditions without subsequent machining.

Laser remelting and quenching technology is a process that uses laser beam to heat the surface of the substrate to above the melting temperature. Due to the internal heat conduction and cooling of the substrate, the surface of the melted layer is rapidly cooled and solidified and crystallized. The microstructure along the depth direction is melting solidification layer, phase transformation hardening layer, heat affected zone and substrate. Compared with the laser hardened layer, the laser melted layer has deeper hardening depth, higher hardness and better wear resistance. The disadvantage of this technology is that the surface roughness of the workpiece is damaged to a certain extent, which needs subsequent machining to recover. In order to reduce the surface roughness of parts after laser melting treatment and reduce the subsequent processing amount, Huazhong University of science and technology has prepared a special laser melting quenching coating, which can greatly reduce the surface roughness of the melted layer. At present, the surface roughness of rolls and guides of various materials in metallurgical industry is close to the level of laser quenching.

1.3 applicable materials

Laser quenching has been successfully applied to the surface strengthening of vulnerable parts in metallurgical industry, machinery industry and petrochemical industry, especially in improving the service life of roll, guide guard, gear, shear blade and other vulnerable parts, the effect is remarkable, and great economic and social benefits have been achieved. In recent years, it has been more and more widely used in the surface strengthening of die, gear and other parts.

 

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