机头锥蒙皮数控拉形过程全流程有限元仿真及回弹预测  

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

作　　者：张贺刚 王志成[2] 王晓臣[2] 杜建宁[2] 彭皓云 朱丽[2] 李小强[3] 阳晓军 Zhang Hegang;Wang Zhicheng;Wang Xiaochen;Du Jianning;Peng Haoyun;Zhu Li;Li Xiaoqiang;Yang Xiaojun(Hangfa Intelligent Manufacturing(Beijing)Technology Co.,Ltd.,Beijing 100083,China;Shenyang Aircraft Corporation,Shenyang 110034,China;School of Mechanical Engineering and Automation,Beihang University,Beijing 100191,China;C3P Engineering Softeware International Co.,Ltd.,Guangzhou 510663,China)

机构地区：[1]航发智造(北京)科技有限公司,北京100083 [2]沈阳飞机工业(集团)有限公司,辽宁沈阳110034 [3]北京航空航天大学机械工程及自动化学院,北京100191 [4]广州希鹏计算机科技有限公司,广东广州510663

出　　处：《锻压技术》2022年第9期83-89,共7页Forging & Stamping Technology

基　　金：国家自然科学基金面上项目(52075025)。

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.

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[航空宇航科学与技术—航空宇航制造工程] TH164[机械工程—机械制造及自动化] TG386[金属学及工艺—金属压力加工]