双曲度蒙皮纵向拉形过程模拟技术研究

目的双曲度蒙皮主要通过可实现曲夹钳的纵向拉形方法成形,通过研究双曲率蒙皮纵拉过程模拟技术,对拉形机夹钳加载轨迹进行优化。方法主要针对蒙皮纵向拉形模拟中,板料在拉形机夹钳中的装夹和夹钳加载轨迹的设计等关键技术问题进行研究,给出了合理的处理方法,建立了相应的模型。结果应用有限元仿真软件进行仿真验证,并通过改变拉伸量和补拉量,对成形模拟结果进行了对比,优化了夹钳轨迹。结论通过拉形加载优化,提高了蒙皮零件贴模度,保证了蒙皮外形精度的要求。

Numerical Simulation Technique of Longitude Stretch Process on Double-curved Skin

Design of jaw path and clamping of sheet on stretch forming machine are the two key technical problems in longitude stretch forming process simulation of skin. The aim of this study was to optimize the jaw loading path through studying simulation technique on double-curvature skin in aircraft. The treatment of key technical problems were proposed and tested in FEM simulation software ABAQUS. By varying the amount of stretching and post-stretching and comparing forming simulation result, the jaw path is optimized. The springback of final part is reduced and the shape accuracy is improved through lading path optimization of longitude stretch forming.