Laser shock device and method based on photonic crystal mixed strong field

Abstract

The invention discloses a laser shock device and method based on a photonic crystal mixed strong field. The device comprises two symmetrically-arranged cavities. The two cavities are each provided with a plurality of laser incidence openings for being provided with laser devices, and the laser incidence openings in the two cavities are formed symmetrically about the symmetry axis of the two cavities. Laser exit openings are symmetrically formed in the opposite positions on the two cavities. The laser exit openings in the two cavities communicate with each other through a cavity connecting plate. A clamping device for clamping a workpiece is fixed to the cavity connecting plate. The laser exit openings in the two cavities are each provided with a baffle capable of being opened or closed. The inner sides of the cavities, the inner side of the cavity connecting plate and the inner sides of the baffles are each provided with a photonic crystal structure material. Shock strengthening is carried out on the overall workpiece, and therefore the efficiency is higher, macroscopic deformation of the workpiece is not likely to be caused, and the laser shock device can act on complex surfaces.

Description

technical field [0001] The invention relates to the technical field of laser processing, in particular to a laser shock device and method based on a photonic crystal mixed-intensity field. Background technique [0002] Shot peening is a process that improves the properties of metallic materials. Traditional shot peening usually uses mechanical methods, such as hammering or shooting, to cause plastic deformation of the metal surface, thus generating residual compressive stress on the surface of the workpiece. However, mechanical shot peening will cause the surface of the workpiece to become rough, so that the fatigue resistance and corrosion resistance of the workpiece cannot be well improved. However, using laser pulses instead of marbles as a peening tool can better impact the metal surface. Usually in laser shock peening, an opaque coating such as black paint or aluminum foil is attached to the metal surface to absorb laser energy to generate plasma, and a layer is added...

AI Technical Summary

Problems solved by technology

[0003] The existing double-sided laser shock peening technology at home and abroad has great limitations. When the laser shocks on both sides of the shock part are asymmetrical, the residual compressive stress generated by the laser shock peening treatment is also asymmetrical, resulting in macroscopic damage to the shock part. At the same time, due to the limitation of the space size of the adjacent blades of the overall blisk, it is not feasible to adopt the double-sided symmetrical oblique incidence method for laser shock strengthening when the size of the adjacent blades is small

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