Geometry-dependent springback behaviors of thin-walled tube upon cold bending  

作　　者：LI Heng YANG He TIAN YuLi LI GuangJun WANG ZhengHua 

机构地区：[1]State Key Laboratory of Solidification Processing,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China [2]Chengdu Aircraft Industry(Group)Corporation Ltd,Chengdu 610092,China [3]Shanghai Aircraaft Manufacturing Corporation Ltd,Shanghai 200120,China

出　　处：《Science China(Technological Sciences)》2012年第12期3469-3482,共14页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 50905144);Program for New Century Excellent Talentsin University;the fund of the State Key Laboratory of Solidification Processing in NWPU;the Natural Science Basic Research Plan in Shaanxi Province (Grant No. 2011JQ6004);the 111 Project (Grant No.B08040)

摘　　要：As one kind of key lightweight components with enormous quantities and diversities, the bent tubular parts have attracted in- creasing applications in aerospace, automobile, etc. Thus, how the inevitable springback behaves under different bending specifications should be fully addressed to efficiently achieve the precision forming of various bent tubes. Taking the medium strength thin-walled 6061-T4 Al-alloy tube as the objective, via the deformation theory of plasticity, explicit/implicit FE method and experimental approaches, we explored and clarified the nonlinear springback rules of the tubes and corresponding mechanisms in universal rotary draw bending regarding angular springback and radius growth by deliberately changing the tube diameter D and wall thickness t. The geometry dependent springback behaviors of thin-walled tube upon cold bending are thus revealed: 1) With the increasing of D, the tangent tensile strain increases and the proportional coefficient decreases, which causes the angular springback to decrease, while the radius springback increases due to the larger bending radius. 2) With the increasing of t, the tangent tensile strain decreases and the proportional coefficient increases, resulting in the increase of both angular springback and radius springback. 3) Under the same D/t, the angular springback varies little, while the radius springback increases with the larger diameter D. 4) The D/t can be used as a reasonable nondimensional index to evaluate the springback angle; as to the radius growth, the individual effects of the D and t should be considered. 5) The verification of the above results was conducted by experiments and analytical analysis.

关 键 词：SPRINGBACK geometry dependence thin-walled tube BENDING aluminum alloy 

分 类 号：TG386.31[金属学及工艺—金属压力加工] TG457.6