Abstract:

The dimensional precision of SMS, which was usually assemblied in the multistage process, determined its appearance, airproof and fatigue performance. Based on the multistage transmitting model of dimensional errors of SMS, this paper detailedly analyzed the dimensional errors of SMS in locating phase,over-locating phase and springback phase, and a state space model of dimensional errors of multistage assemblies about SMS was erected. Finally, this paper simulated their dimensional errors of aeroplane wainscot subassembly sample by MATLAB and FEM, and furthermore analyzed transmitting law of assembly dimensional errors.It is of vital help to reduce dimensional errors of SMS.

Key words: sheet metal subassembly（SMS）, multistage assembly, dimensional error modeling, deformation springback; , analysis simulation

摘要：

钣金件装配尺寸精度影响其外观、密封及疲劳强度等性能,故很多高精度钣金件采用多工位装配工艺。在建立钣金件多工位装配尺寸误差传播模型的基础上,详细分析了钣金件完全定位、过定位和释放回弹阶段产生的装配尺寸误差,采用状态空间法建立了多工位钣金件装配尺寸误差模型。最后,用MATLAB和FEM仿真了某飞机壁板样件两工位装配尺寸误差,进一步分析了装配尺寸误差传播规律,减小了钣金件装配尺寸误差。

关键词: 钣金件, 多工位装配, 尺寸误差建模, 变形回弹, 分析仿真