型材拉弯模拟算法的开发及应用  

Development and application of numerical simulation algorithm for extrusion stretch forming

作　　者：谢邵辉[1] 柳玉起[1] 杜亭[1] 章志兵[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《锻压技术》2011年第4期39-43,共5页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(50905066);华中科技大学自主创新基金资助项目(Q2009010)

摘　　要：开发了基于有限元增量理论和BWC壳单元的型材拉弯模拟算法。本算法对型材拉弯机构中夹钳的运动进行了深入分析。采用速度约束的方法来模拟夹钳的运动轨迹,并对夹钳所在板料位置上的节点进行约束处理,保证了夹钳速度加载的正确性。以矩形截面型材拉弯零件为例,采用文献中的夹钳运动加载方案对其进行型材拉弯成形模拟。将本算法计算的结果与文献中的试验结果进行对比,可以验证本算法在型材拉弯成形模拟中的计算精度。The numerical simulation algorithm for the extrusion stretch forming was developed based on BWC shell element and dynamic explicit method.The motion mechanism of the stretch machine was analyzed by this algorithm.The trajectory of the clamp was simulated by the way of constraint velocity,and the nodes in the area of the clamp were constraint nodes,so the accuracy of the clamp velocity loading could be guaranteed.The extrusion stretch forming simulation of a rectangular cross-section bending piece was carried on with a load path provided by the literature,and the comparisons between the results calculated by this algorithm and the experimental results were compared.The conclusion can be drawn that this algorithm is precise in the extrusion stretch forming simulation.

关 键 词：型材拉弯 数值模拟 BWC壳单元 约束速度 

分 类 号：TG356.25[金属学及工艺—金属压力加工]