Energy compensation constant power density laser oblique impact method

Abstract

The invention relates to the technical field of material surface strengthening treatment, and concretely relates to an energy compensation constant power density laser oblique impact method. The method comprises the following steps: obtaining the curvature radius of the strengthening area of a part to be processed, and judging the incident angle range of laser; determining the pulse width, the light spot diameter, laser energy required by a vertical incidence condition, and other parameters of the laser; calculating the required laser energy at a minimum incidence angle, and judging whether the energy is within the technical indexes of a laser device or not; and performing laser impact strengthening on the part by using pulsed laser beams of different energies. The laser power or energy iscompensated according to the change of the incident angle and the curvature radius of the part to be processed to avoid the uneven strengthening effect caused by the change of the shape and the areaof the projection surface, of the laser beam, on the surface of the part, so constant strength enhancement is achieved, the constant value of the laser power density in the same area or on the same track is ensured, the uniformity of the impact effect is improved, and the roughness of the laser impact treated surface is reduced.

Description

technical field [0001] The present invention relates to the technical field of material surface strengthening treatment, and more specifically, relates to an oblique laser impact method with energy compensation and equal power density. Background technique [0002] Laser shock is a technology that uses strong laser-induced shock waves to strengthen metals, which can greatly enhance the durability of metal materials. Because the laser has good accessibility and can be precisely positioned, the laser shock peening technology can treat some parts that cannot be treated by the traditional surface peening process. Laser shock peening technology is especially suitable for strengthening small holes, chamfers, welds and grooves. However, when laser shock strengthening is performed on the arc of the impeller or the overall blade root, it must be laser shock strengthening at an oblique incident angle. With the change of incident angle and arc angle, the shape and area of ​​the projec...

AI Technical Summary

Problems solved by technology

However, when laser shock strengthening is performed on the arc of the impeller or the overall blade root, it is necessary to perform laser shock strengthening at an oblique incident angle. With the change of the incident angle and arc angle, the shape and area of ​​the projected surface of the laser beam acting on the surface will change. Variation, uneven effect of laser shock peening

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