A device and method for dynamic regulation of laser shock strengthening energy density

Abstract

The invention discloses a laser shock strengthening energy density dynamic control device and method, comprising: a laser, a light guide component, a switchable focusing component, a mechanical arm, a constrained layer loading mechanism and a clamping component; the two ends of the light guide component are respectively connected to The laser is connected to the switchable focus component; the switchable focus component is connected to the control system to control the switchable focus component to switch the light transmittance; the constrained layer loading mechanism forms a constrained layer on the metal part, and the laser beam output by the switchable focus component passes through the constraint The layer acts on the metal part; the metal part is installed on the mechanical arm through the clamping part, and drives the metal part to move; the device switches the light transmittance by controlling the switchable focusing component, and is aimed at structures with complex curved surfaces and uneven wall thickness. The change of curvature can change the energy density online in real time to ensure the consistency of laser shock intensity and improve the uniformity of the distribution of surface integrity parameters such as residual stress.

Description

technical field [0001] The invention relates to the technical field of laser shock peening, in particular to a device and method for dynamically regulating energy density of laser shock peening. Background technique [0002] Laser shock peening is a new technology that uses high-energy pulsed laser-induced shock waves to strengthen metals, which can significantly enhance the fatigue resistance of metal materials. Due to its good controllability and repeatability, laser shock peening technology is especially suitable for parts such as aero-engine blades with thin walls and complex curved surfaces. The surfaces of aeroengine blades and turbine disk tenons and grooves are generally three-dimensional curved surface structures. If the laser beams with the same energy distribution are used to strengthen the above curved surface structures, it will result in uneven stress on the surface to be processed, and even lead to partial curved surfaces. Severe deformation and stress concen...

AI Technical Summary

Problems solved by technology

The surfaces of aeroengine blades and turbine disk tenons and grooves are generally three-dimensional curved surface structures. If the laser beams with the same energy distribution are used to strengthen the above curved surface structures, it will result in uneven stress on the surface to be processed, and even lead to partial curved surfaces. Severe deformation and stress concentration occur

[0003] The existing laser strengthening processing technology cannot achieve real-time variable parameters. For parts with complex curved surfaces such as blades, if the parameters cannot be controlled in real time, the ideal effect of strengthening the parts cannot be met.

If the laser energy density is too small, the strengthening effect of the wall thickness will decrease; if the laser energy density is too high, severe plastic deformation and thermal damage will occur in the thin wall, resulting in the scrapping of the part

Engine blades or blisks are the core parts of aero-engines, which require high precision and mechanical properties. At the same time, difficult-to-machine materials are used, and the processing efficiency is low, the cycle is long, and the cost is high.

If the parameters cannot be changed in real time and the laser shock peening effect cannot achieve the desired effect, the reliability and service life of the parts will be greatly reduced, and the serious result will directly lead to the deformation and scrapping of the parts

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