Method for controlling deformation of thin-walled part with complex curved surface in laser peening strengthening process

Abstract

The invention discloses a method for controlling deformation of a thin-walled part with a complex curved surface in a laser peening strengthening process. The method comprises the following steps of S1, establishing a library file which comprises deformation forms of plates under different conditions; S2, determining the corresponding relation between the plastic deformation depth of the plate material surface and the plate material deformation mode and the deformation amount, and storing the result in a library file, and storing the result in a library file; S3, based on elastic-plastic mechanics, combining analysis and processing of finite element simulation and laser peening blasting experiment results, establishing deformation characteristic parameters of different deformation forms, and determining positive and negative deformation conversion threshold parameters; and S4, based on the characteristic equation or the curved surface coordinates of the curved surface of the thin-wallpart, deformation characteristic parameters are calculated in combination with the laser peening parameters and the thicknesses of the different areas, and whether the selected laser peening blastingstrengthening parameters deform or not is determined. The method has the advantages of being visual in scheme, easy to judge and capable of effectively controlling deformation of the thin-walled partwith complex curved surface in the laser peening strengthening process, and the high-requirement standard of the complex-curved-surface thin-wall structure part is met.

Description

technical field [0001] The invention belongs to the technical field of laser processing and manufacturing, and in particular relates to a method for controlling deformation of thin-walled parts with complex curved surfaces during laser shot peening strengthening. Background technique [0002] As a new surface modification technology, laser shot peening has the advantages of high loading pressure, deep influence of plastic deformation, controllable impact area and loading pressure parameters, and easy automation. Plastic deformation occurs, that is, micro pits are formed on the surface to realize local volume transfer on the surface of the part, causing the part to deform, especially in the process of laser shot peening of complex curved thin-walled parts, the complex surface curvature makes thin-walled parts very easy Bending and torsional deformations occur, and reasonable evaluation and prediction of the deformation of complex curved surface thin-walled parts during laser ...

AI Technical Summary

Problems solved by technology

[0002] As a new surface modification technology, laser shot peening has the advantages of high loading pressure, deep influence of plastic deformation, controllable impact area and loading pressure parameters, and easy automation. Plastic deformation occurs, that is, micro pits are formed on the surface to realize local volume transfer on the surface of the part, causing the part to deform, especially in the process of laser shot peening of complex curved thin-walled parts, the complex surface curvature makes thin-walled parts very easy Bending and torsional deformations occur, and a reasonable evaluation and prediction of the deformation of complex curved surface thin-walled parts during laser shot peening can help improve the effect of laser shot peening; the current evaluation method is cumbersome to judge and it is not convenient situation control

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