锻压技术

机头锥蒙皮数控拉形过程全流程有限元仿真及回弹预测

英文标题：Finite element simulation and springback prediction on whole process for CNC stretch forming process of nose cone skin

作者：张贺刚1 王志成2 王晓臣2 杜建宁2 彭皓云2 朱丽2 李小强3 阳晓军4

单位：1.航发智造(北京)科技有限公司 2.沈阳飞机工业（集团）有限公司 3.北京航空航天大学机械工程及自动化学院 4.广州希鹏计算机科技有限公司

关键词：蒙皮拉形回弹预测数控拉形机全流程仿真

分类号：V260.5;TH164;TG386

出版年,卷(期):页码：2022,47(8):83-89

摘要：

为了提高新一代飞机的气动性能，对表面外形精度的要求显著提高，因此，必须控制蒙皮拉形后的零件回弹。基于自主开发的国产蒙皮拉形仿真软件AISF，对机头锥蒙皮数控拉伸成形、切边、回弹全过程进行了有限元仿真。对VTL1000数控蒙皮拉形机的关键运动机构进行了测量，建立了考虑机床实际运动的蒙皮拉形有限元仿真模型。将实际零件数控拉形代码直接输入有限元仿真模型，保证仿真边界条件与试验完全一致。考虑实际生产条件，建立了拉形—回弹—切边—压紧仿真模型，实现了回弹的仿真预测。根据优化后的数控拉形代码，成形出了实际零件并进行了数字化检测，发现回弹预测与实际基本吻合，验证了有限元仿真模型的准确性。

In order to improve the aerodynamic performance for new generation of aircraft, the requirements on the surface shape accuracy have been significantly increased, so it is necessary to control the springback of parts after the skin is stretched. Therefore, based on the self-developed domestic skin stretch forming simulation software AISF, the whole process of CNC stretch forming, trimming, springback for the nose cone skin was simulated numerically. Then, the key motion mechanism of VTL1000 CNC skin stretch forming machine was measured, and a finite element simulation model of skin stretch forming considering the actual motion of machine tool was established. Furthermore, the CNC stretch forming code of the actual parts was directly input into the finite element simulation model to ensure that the simulation boundary conditions were completely consistent with the experiment. Considering the actual production conditions, a simulation model of stretch forming-springback-trimming-pressing was established to realize the simulation prediction of springback. According to the optimized CNC stretch forming code, the actual parts were formed and digitally inspected. The results show that the springback prediction is basically consistent with the actual situation, which verifies the accuracy of the finite element simulation model.

基金项目：

国家自然科学基金面上项目（52075025）

张贺刚（1978-），男，硕士，工程师 E-mail：hgbox@qq.com 通信作者：李小强（1979-），男，博士，教授 E-mail：littlestrongcn@163.com

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