Abstract The skin of an aircraft contains curved surface, which is a key component that determines its aerodynamic shape. During the manufacturing of its skin-parts, large springback often occurs, when conventional forming methods are used. Electromagnetic forming can reduce the springback substantially. In addition, the forming process enables moving coil discharge, which can be used to form large parts. In this study, an electromagnetic partitioning forming method is proposed that facilitates precise manufacturing and precise springback control of a single curvature part. A numerical simulation was used to analyze sheet deformation and stress - strain distribution in the sheet. Numerical simulation was also used to analyze the springback for both pure bending with large bending radius and electromagnetic partitioning forming. The simulation reveals that pure bending with large bending radius causes mainly elastic deformation in the sheet, while electromagnetic partitioning forming converts elastic deformation into plastic deformation. In addition, the residual stress on the sheet, after coil discharge, is small. Both experiment and simulation show very large springback in sheets that are subjected to pure bending with large bending radius but only small springback in sheets that are subjected to electromagnetic partitioning forming.

中文翻译：

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曲面零件制造中的电磁分区成形及回弹控制

摘要 飞机蒙皮包含曲面，曲面是决定飞机气动外形的关键部件。在其蒙皮部件的制造过程中，当使用传统的成型方法时，经常会发生大的回弹。电磁成型可以大大减少回弹。此外，成型工艺可实现动圈放电，可用于成型大型零件。在这项研究中，提出了一种电磁分区成形方法，该方法有助于单个曲率零件的精确制造和精确回弹控制。数值模拟被用来分析板材变形和应力-应变分布在板材中。数值模拟也用于分析大弯曲半径的纯弯曲和电磁分区成形的回弹。模拟表明，大弯曲半径的纯弯曲主要引起板材的弹性变形，而电磁隔板成形则将弹性变形转化为塑性变形。此外，线圈放电后片材上的残余应力很小。实验和模拟都表明，在大弯曲半径下进行纯弯曲的板材回弹非常大，而电磁分区成型的板材回弹很小。