Light-water coaxial laser shock reinforcing head

Abstract

The invention belongs to the field of laser shock reinforcement and specifically, relates to a light-water coaxial laser shock peening head. The light-water coaxial laser shock peening head comprises a water nozzle module and a focusing module. One end of the focusing module is connected to a parent module of a laser shock peening system. The other end of the focusing module is connected to one end of the water nozzle module. A water column is ejected from the other end of the water nozzle module. The distance between a focal plane of a focusing mirror and a water nozzle outlet can be adjusted by the focusing module so that the adjustment on water column length is realized to satisfy different technological requirements. The light-water coaxial laser shock peening head has the advantages that 1,through a light-water coaxial mode, parameter fluctuation caused by the existing water restraint layer application mode is reduced, and processing stability and flexibility are improved; 2, through total reflection of a light beam emitted into air from a water surface, constraint and shaping of a laser beam are realized; 3, through water kinetic energy, a constraint effect of a water restraint layer is enhanced; and 4, through the advantages of 1 to 3, laser shock peening effects are improved, and automatic and industrialized production difficulty is reduced.

Description

technical field [0001] The invention belongs to the field of laser shock strengthening, in particular to a light-water coaxial laser shock strengthening head. Background technique [0002] Laser shock peening technology (Laser Shock Peening, LSP) is the use of high energy density (GW / cm 2 order of magnitude), a short pulse (ns) pulse laser impacts the material, generating an intense laser-induced plasma on the surface of the material. The GPa-level shock wave generated by the blasting acts on the surface of the material and propagates to the inside, causing plastic deformation and complex dislocation structure in a certain area of ​​the material surface, forming a large residual compressive stress, and improving the fatigue strength and corrosion resistance of the parts. At present, this technology has been widely used in various industries such as mechanical manufacturing engineering, aerospace, microelectronics, national defense, and medical treatment. [0003] In the pr...

AI Technical Summary

Problems solved by technology

These two methods have their own characteristics. The former method can obtain a relatively flat constrained layer interface, and the processing process is relatively stable, but the processing system is not flexible enough, and the processing range is limited by the size of the water tank, and it is necessary to wait for the water level to recover after each impact. , lower processing efficiency

The latter method is simple and highly flexible, but the thickness of the water layer is not easy to control. The water curtain is biased on the side of the laser beam, and its landing point needs a certain distance from the laser beam. Therefore, it may be difficult to process certain shapes of parts. Reach the best match point of laser beam and water curtain

In addition, the above two water-constrained layers are easy to splash when the impact frequency is high, and the water droplets and mist in the optical path will scatter the laser light. In severe cases, they may adhere to the optical lens and damage the optical lens.

[0005] In addition, from an optical point of view, the existing impact strengthening equipment usually estimates the spot size through the defocus amount, and the error is large; and usually lacks constraints on the beam, which often causes changes in the laser power distribution on the processed surface, affecting the stability of the process sex

If you want to ensure the uniformity of power distribution, you need to add more complex beam shaping equipment, and this equipment is usually very expensive

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