汽车覆盖件重力变形的数值模拟方法  

A numerical method to simulate the gravity distortion of automotive panels

作　　者：罗仁平[1] 张博凡[1] 孙东继[1] 

机构地区：[1]上海通用汽车有限公司冲压模具工艺及新项目科,上海201206

出　　处：《模具技术》2014年第4期6-9,共4页Die and Mould Technology

摘　　要：汽车覆盖件尺寸较大、形状复杂,容易因自身重力产生变形,从而对零件在检具上的测量产生影响。GD&T(Geometric Dimension and Tolerance几何尺寸与公差)是测量零件尺寸的依据,其合理与否对零件合格率有重要影响。传统评估GD&T的方法是依靠模板和现场经验,准确性和效率不高。为了提高效率,采用数值模拟方法计算零件在基准位置的变形,通过分析基准的变形是否超出图纸公差来评估GD&T是否合理。应用实例表明,采用数值模拟方法评估GD&T能够提高效率,效果良好。The automobile cover panel with a large dimension and complex shape is distorted easily due to the gravity,which will influence the measurement intensively.GD＆T（Geome-tric Dimension and Tolerance）is the measurement standard of the part dimensions.The ra-tionality of GD＆T has great effects on the qualified rate of the panels.However,GD＆T is usually evaluated by templates and experience,which has low accuracy and efficiency.To deal with this problem,the distortion on the reference point is calculated by the numerical simulation method,and GD＆T is evaluated by comparing the tolerance and the simulated distortion.A practical application shows that using the numerical simulation can improve the efficiency of evaluating GD＆T.

关 键 词：汽车覆盖件 重力变形 检具 数值模拟 

分 类 号：TG376.2[金属学及工艺—金属压力加工]