薄壁铜管绕弯截面畸变的数值模拟及实验研究

摘要

A FEM of rotary draw bending of copper tube is established by MSC.Marc/ Mentat,and the model size is 7.00mm × 0.41mm × 10.00mm(Outside diameter × Wall thickness × Bending radius).The model is verified by e×periments.The impact of mandrel diameter,mandrel extends and frictions on the variation of tube section distortion of rotary draw bending are studied using this model.The results indicate that the cross-sectional distortion amount is reduced with increases of mandrel diameter and the amount of extending.It increases when the coefficient of friction is bigger.The outside of tube is prone to rupture if it is bent when the coefficient of friction is greater.%利用有限元软件MSC.Marc/Mentat建立了薄壁铜管绕弯有限元模型,并对模型进行了实验验证.研究分析芯棒直径、芯棒伸出量及摩擦工艺参数对7.00mm×0.41mm×10mm(外径×壁厚×弯曲半径)薄壁铜管绕弯的截面畸变的影响.结果表明,截面畸变量随芯棒直径和伸出量的增大而减小,随摩擦系数的增大而增大,若摩擦系数较大时进行弯管,管材外侧易出现破裂.