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| Machining Deformation Control Method of Structural Parts by Multi-Process Fusion Based on Natural Evolution Strategy |
| LIU Xingyan, LIU Changqing |
| ( College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China ) |
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Abstract The pre-deformation of the blank and the machining position of the workpiece have an important influence on the final machining deformation of the workpiece. Pre-deformation of the blank and optimization of the machining position are an effective way to control the deformation of the workpiece. Due to the difficulty in solving the parameters of multi-process variable optimization, it is difficult to achieve precise control of the deformation of the workpiece only for single process optimization. Aiming at the above problems, this paper proposes a multi-process fusion structure processing deformation control method based on natural evolution strategy. Considering the influence of blank pre-deformation and machining position on workpiece variables, a finite element simulation model is established, and the optimal parameters are searched by PEPG (Parameter-exploring policy gradients) optimization algorithm to realize the control of machining deformation. Finally, a typical aircraft structural member is taken as an example to verify in the simulation environment. The results show that the method can significantly control the workpiece deformation.
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2020, 
