板带不均匀压下面内弯曲成形机理的有限元分析  

Finite Element Analysis of In Plane Bending of Strip Metal under Unequal Compressing

作　　者：鲜飞军[1] 杨合[1] 李明奇[1] 

机构地区：[1]西北工业大学材料科学与工程系,陕西西安710072

出　　处：《西北工业大学学报》2000年第4期644-648,共5页Journal of Northwestern Polytechnical University

基　　金：国家自然科学基金 !(5 9475 0 5 9);航空科学基金 !(94G5 3111)资助

摘　　要：运用刚塑性有限元数值模拟方法 ,定量分析了不均匀变形对圆环成形的协调作用 ,数值模拟的可靠性得到了实验验证。研究表明 :沿板带接触变形区宽度上的各点对形成圆环所作的贡献 ,由压下量最小的点向压下量最大的点单调递增 ;圆环的形成 。In Ref. [1], we stated that we could develop into an advanced process in plane bending of strip metal with unequal compressing achieved with conical rollers. In Ref. [2], we established a model for the process. Eq.(2) in this paper is the above mentioned model. Eq.(2) contains a number of undetermined coefficients C i (where subscript i denotes the i th point along the compressed width of strip metal, i=1,2,…,N ), where C i describes the contribution of compression deformation at i th point to in plane bending. Using rigid plastic finite element method, we obtained the C i coefficients in Fig.5, which shows that the value of C i linearly increases from the point with less compression deformation to the point with greater compression deformation. With C i known, we can compute the radius of curvature. Using specific numerical data given in Table 3, with N=6 in Eq.(2), we obtained R ina (computed or analytical inner radius of curvature) which differs from R ine (experimental inner radius of curvature) by a maximum of 9.1% in nine different tests. It appears N6 gives sufficient accuracy for the prediction of radius of curvature. The results are helpful to the understanding of the positive role of unequal deformation in metal forming processes .

关 键 词：塑性加工 不均匀压下 面内弯曲 成形机理 刚塑性有限元 

分 类 号：TG386.3[金属学及工艺—金属压力加工]