整体壁板压弯成形的形状控制

针对整体壁板压弯成形过程中由于回弹导致的压弯成形精度低和不可控问题，提出整体壁板压弯成形形状控制方法。以铝合金（7050-T7451）机翼整体壁板为研究对象，设计了整体壁板缩比试件模型，基于弹塑性变形理论和几何分析建立了压弯成形局部变形下压量解析预测模型，基于有限元法建立了压弯成形整体变形有限元仿真预测模型，并将模拟结果与实验结果进行了对比；在压弯成形局部-整体变形预测模型的基础上，综合考虑局部-整体变形精度，利用迭代补偿机制与逐步逼近思想，构建了压弯成形轮廓曲线迭代模型。通过与传统的试错法进行对比，研究结果表明所提方法能够以更高的精度、更快的收敛速度有效控制压弯件的成形形状。

Shape control for press bend forming of integral panels

To solve the problems of low precision and uncontrollability caused by springback during the press bend forming of integral panels, this paper proposes a shape control method for bent parts. The specimen is designed with the aluminum alloy (7050-T7451) aircraft integral panel as the research object. In addition, the displacement prediction model of the local deformation is established based on the elastoplastic deformation theory and geometric analysis. A finite element simulation prediction model for the overall deformation of press bend forming is then developed, and the simulation results are compared with the test results. Furthermore, on the basis of the prediction model and considering the local-to-global deformation precision, this study constructs the contour curve iterative model based on the iterative compensation mechanism and the step by step approximation method. Compared with the traditional trial and error method, the proposed method can effectively control the shape of the bent parts with higher precision and faster convergence speed.