小直径LF6铝合金管数控弯曲回弹规律  

Springback laws of small diameter LF6 aluminum alloy tube in NC bending

作　　者：吴青云[1] 顾彬[1] 李淑慧[1] 

机构地区：[1]上海交通大学上海市数字化汽车车身重点实验室,上海200240

出　　处：《塑性工程学报》2015年第5期63-68,共6页Journal of Plasticity Engineering

基　　金：上海交大-航空八院149厂合作项目(12GF-JJ08-010)

摘　　要：航空用小直径铝合金管在数控弯曲卸载后会产生比较明显的回弹现象,影响零件的几何和形状精度。基于有限元软件AUTOFORM,建立了LF6铝合金管数控弯曲弹塑性有限元模型。利用该模型,研究了弯曲角度与卸载后回弹角度之间的关系,并通过正交实验分析了工艺参数对小直径LF6铝合金管数控弯曲回弹的影响规律。结果表明,回弹角随着弯曲角度的增大而线性增大;回弹角随芯棒伸出量的增大而减小,随芯棒与管材间隙和管材与压块间摩擦系数的增大而增大,压块相对助推速度小于1时,回弹角增大。The significant springback after unloading in numerically controlled（NC）bending of aviation small diameter LF6 aluminum alloy tube will affect the geometric and shape accuracy.An elastic-plastic FE model of LF6 aluminum tube in NC bending was established based on FE software AUTOFORM,which reliability has been validated by the experiments.The relationship between springback angle and bending angle was investigated using the model,and the influence significance and rules of the processing parameters on the springback of small diameter LF6 aluminum alloy tube in NC bending was analyzed through virtual orthogonal tests.The results show that the springback angle increases linearly with the increasing of bending angle,and the springback angle reduces as the mandrel protrusion length increases,but increases as the clearance between pressure die and tube and the friction coefficient between pressure die and tube increase.When the relative boosting velocity is lower than 1,the springback angle increases.

关 键 词：LF6铝合金管 数控弯曲 回弹 弯曲角度 

分 类 号：TG386[金属学及工艺—金属压力加工]