Method for determining distributed process parameters of laser peening forming complex curved surface

Abstract

The invention provides a method for determining distributed process parameters of a laser peening forming complex curved surface. The method comprises the following steps: establishing a function relationship between a deflection curved surface and an intrinsic moment based on plate shell mechanics, and establishing an optimization model based on partial differential equation constraint by takinga distributed intrinsic moment function as a design variable; according to a curved surface parameter equation or a curved surface coordinate of the workpiece, dispersing a target curved surface, selecting an appropriate optimization algorithm to solve an optimization model, and calculating a distributed natural moment; dividing into a plurality of isoparametric areas convenient for process operation according to the size of the distributed natural moment, and determining a laser peening forming scanning scheme in each area; and establishing a process database corresponding to process parameters and inherent moments through experiments, determining the experiment process parameters, and determining the optimal distributed process parameters in combination with the requirements of residualstress. The method for determining the complex curved surface forming technological parameters is established on the basis of the elastic plate shell theory, and high efficiency and precision are achieved.

Description

technical field [0001] The present invention relates to special machinery manufacturing technology, in particular, to a method for determining the distributed process parameters of laser shot peening forming complex curved surfaces, in particular to a process parameter for determining the distributed characteristics of workpieces with laser shot peening forming complex curved surfaces Methods. Background technique [0002] Laser shot peening is a near-net moldless forming technology that uses laser-induced plasma explosion waves to act on plates to produce plastic deformation. This process has slow curvature changes in large structures such as wing panels and space launch vehicle fuel tanks. It has broad application prospects in the forming of workpieces with complex curved surfaces. Because the process uses laser as the energy source, the process parameters are highly controllable, which makes it easier to realize the precise forming of large curved workpieces. However, s...

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Problems solved by technology

Therefore, process planning based on intrinsic strain is ill-posed

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