双弯曲反射面天线卧立转换尺寸偏差分析方法  

Dimensional Variation Analysis Method for the Assembly of Double Curved Reflector before and after the Lie-to-stand State Conversion

作　　者：倪俊[1] 汤文成[1] 幸研[1] 

机构地区：[1]东南大学机械工程学院,南京211189

出　　处：《机械工程学报》2015年第17期120-127,共8页Journal of Mechanical Engineering

基　　金：某部先进制造技术预先研究(51318010102;51318010103;51318010404);国家科技支撑计划(2012AA040903);苏州科技发展(SYG201221)资助项目

摘　　要：针对包含数千铆钉的双弯曲反射面天线装配尺寸精度计算问题,提出一种卧立转换尺寸偏差回弹分析方法:以动力学有限元模型表示一组铆接工艺参数(铆钉和局部板件尺寸、材料参数、辅助装夹位置、铆钉镦粗方向,冲头位移规律);完成动力学有限元计算,得到的铆钉孔周固有变形分布,不难发现,孔周固有变形分布与铆接工艺参数存在明确的对应关系;经空间插值,为薄壁部件静力学有限元代码中每个铆钉孔加载铆钉孔周固有变形和已计算出的变形,实现铆接变形作用下的结构装配尺寸偏差分析。以纯动力学有限元计算结果验证方法准确性。以大尺寸薄壁部件为对象,研究零件重力和铆接变形所导致的装配尺寸偏差在卧立转换前后的回弹效应。A method for analyzing the spring-back effect of dimensional variation before and after the lie-to-stand state conversion for the assembly of double curved reflector with abundant rivets is proposed. Inherent deformation distribution around the rivet hole is primarily got from one analysis based on the dynamic finite element （FE） model representing one given riveting process. Among the parameters of this riveting process are rivet and local part dimension, material property, clamping position in the riveting, rivet upsetting direction, and hammer displacement law. The rivet-deformation-induced variation is then solved by the integrated static FE analysis where inherent deformation and the possible former solved deformation are added to the nodes around each rivet hole as the boundary condition using spatial interpolating method, and validated by the comparison with the variation given by pure dynamic FE analysis. The discussion about the spring-back effect of dimensional variation taking the gravity and rivet deformation into account for large-scale assembly before and after the lie-to-stand state conversion is finally made true.

关 键 词：铆钉 装配 偏差 回弹 

分 类 号：TG316[金属学及工艺—金属压力加工] V262[航空宇航科学与技术—航空宇航制造工程]