基于自然进化策略的多工艺融合结构件加工变形控制方法

Machining Deformation Control Method of Structural Parts by Multi-Process Fusion Based on Natural Evolution Strategy

毛坯预变形与工件加工位置对工件最终加工变形有着重要影响,毛坯预变形与加工位置优化是控制工件加工变形的一种有效途径,同时考虑到多工艺变量优化的参数求解困难,仅针对单一工艺优化很难实现对工件变形的精确控制。针对以上问题,提出了一种基于自然进化策略的多工艺融合结构件加工变形控制方法。综合考虑毛坯预变形与加工位置对工件变量的影响,建立有限元仿真模型,采用PEPG(Parameter-Exploring Policy Gradients)优化算法搜索最优参数,从而实现对加工变形的控制。最后,以典型飞机结构件为例,在仿真环境中进行验证,结果表明该方法能显著控制工件加工变形。

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.