摘要
针对目前复杂蒙皮拉形工艺中拉形模的设计没有实用、详细设计方法的情况,从改善毛料拉形过程中的应变分布出发,提出了一种基于"截面线等长"的拉形模型面设计方法,即通过工艺补充面的灵活设计,实现模具沿各个拉伸方向上的截面线长度趋于一致,以使毛料在贴模后各个截面的延伸率尽可能的接近,再通过工艺补充面的曲率和切向的调整,使毛料在拉形时应变分布更加均匀,以减少甚至避免与应变分布相关的各种缺陷的出现.通过某型号飞机复杂蒙皮零件模具型面的设计及拉形过程的有限元模拟分析,验证了这一拉形模具型面设计方法的合理性和有效性.
A design method based on equilong section lines for tool surface in complex aircraft skin stretching was proposed to improve the strain distribution of blank during stretching, against the lack of practical and detailed design methods for tool surface in complex aircraft skin stretching. In this method, section lines of tool surface along stretching direction were designed as equilong as possible by adjustment of process addendum to gain approximate elongations on all section lines of blank after stretching, and then curvature and tangent directions were adjusted to obtain uniform strain distribution on blank after stretching and decrease or avoid appearance of failings relative strain distribution. This design method was verified to be of feasibility and validity by the design of a tool surface for a complex aircraft skin stretching and the strain distribution obtained by finite element method （FEM）.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2008年第11期1360-1363,共4页
Journal of Beijing University of Aeronautics and Astronautics
基金
国家863计划资助项目(2007AA04Z1A3)
国防基础科研资助项目(D0620060428)
关键词
飞机蒙皮
拉形
模具设计
有限元模拟
aircraft skin
stretching
tool surface design
finite element method
