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中文摘要：
研究了一种薄壁异形铝管面内绕弯成形过程.基于LS-DYNA软件平台建立了铝管弯曲过程的有限元仿真模型,并通过实验验证了模型的可靠性.提出了该口琴形截面薄壁异形管弯曲成形过程中孔道畸变的评价方法,分析了弯曲变形后各孔道的变化规律,以及弯曲角度、弯曲半径、模具与管坯间隙和模具与管坯间的摩擦对异形管孔道畸变的影响规律.研究结果表明：异形管弯曲变形后外侧孔道缩小而内侧孔道扩大,其孔道的畸变程度近似呈线性分布;增大弯曲半径有利于减小孔道畸变程度,而弯曲角度、模具与管坯间隙和模具与管坯间的摩擦对孔道畸变影响不大.
英文摘要：
The in-plane rotary draw bending process of a kind of thin-walled irregular aluminum tube was studied.Based on the software LS-DYNA,a finite element model of rotary drawing bending process for（aluminum） tube was established,and its reliability was validated by experiment.An evaluation method was proposed to describe the channel distortion of the thin-walled irregular tube with harmonica-shaped section.According to the simulation results,the variation laws of the irregular tube channels were revealed.The influences of bending angle,bending radius,clearance between module and tube,and friction on the formability were obtained.The results show that the outside channels are expanded and the inside channels become narrow after the tube bending,and the distortion degree of the channels exhibits a linear distribution.Increasing the bending radius can alleviate the channel distortion,while the bending angle,clearance between module and tube,and friction condition between module and tube have little effect on the channel distortion of the tube.
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