A laser cladding head

Abstract

The invention discloses a laser cladding head. Each of an exhaust gas channel and a compressed air gas channel of the laser cladding head is provided with a gas flow meter. The gas flow displayed on the two gas flow meters is the same by adjusting the exhaust speed of an exhaust system and the pressure of compressed air, it can be ensured that a lens protection gas channel composed of the compressed air gas channel and the exhaust gas channel cannot interfere with the air flowing state outside a machining head, and therefore it is ensured that during laser cladding, mixed gas flow injected out by a cladding nozzle and composed of protection gas and powder is affected by the lens protection gas channel as little as possible, and the laser cladding quality is improved; and in addition, an inner hole of an annular blocking ring is designed into a conical hole so that disturbance of gas flow in a lower cavity of the cladding head can be prevented, and therefore gas flow of the lens protection gas channel can be further prevented from interfering with the mixed gas flow composed of the protection gas and the powder, and the laser cladding quality is improved.

Description

technical field [0001] The invention relates to the field of special processing, in particular to a laser cladding head. Background technique [0002] Laser cladding can obtain a protective layer with specific properties on the surface of metal workpieces, which can greatly improve the wear resistance, corrosion resistance, and hydrogen embrittlement resistance of the workpiece, and can greatly improve the service life of key components. Laser cladding usually adopts coaxial powder feeding method, which is flexible and can be used for laser cladding on parts with complex surfaces. When the powder is subjected to high-power-density laser action, plasma will be generated, and the mixture of plasma and fine powder will move towards the lens at a very high speed, resulting in contamination of the focusing lens, and the polluted focusing lens will continue to undergo laser action After that, it will cause ablation damage to the lens. Usually, a protective lens can be placed und...

AI Technical Summary

Problems solved by technology

When the powder is subjected to high-power-density laser action, plasma will be generated, and the mixture of plasma and fine powder will move towards the lens at a very high speed, resulting in contamination of the focusing lens, and the polluted focusing lens will continue to undergo laser action After that, it will lead to ablation damage of the lens

Usually, a protective lens can be placed under the focusing lens to prevent the ablation of the focusing lens. However, the protective lens will also be ablated and damaged. The Chinese patent "Coaxial Nozzle for Laser Cladding (Application No. 201210293222.8)" proposes a However, when this structure is adopted, the shielding gas sprayed from the shielding gas inlet cannot be well discharged from the other end of the shielding gas path, and a large part of it will be from the processing Nozzle ejection, which interferes with the coaxial powder feeding airflow, resulting in unstable powder feeding and affecting the cladding effect

Images