铜管变角度增量翻边成形极限的试验研究  

Experimental study on forming limit of variable angle incremental flanging for copper tube

作　　者：侯晓莉[1] 李言[1] 邱旭 肖旭东 杨明顺[1] Hou Xiaoli;Li Yan;Qiu Xu;Xiao Xudong;Yang Mingshun(School of Mechanical and Precision Instrument Engineering,Xi′an University of Technology,Xi′an 710048,China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,陕西西安710048

出　　处：《锻压技术》2022年第10期162-168,共7页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(52075437,51905423)。

摘　　要：在对薄壁圆管构件进行增量翻边成形时,管料容易发生破裂、起皱等缺陷,且材料的变形机制演化复杂,对加载条件极为敏感,使得管料在增量翻边成形时的破裂预测和控制比较困难。针对该问题,选取T2紫铜为研究材料,构建金属管材变角度增量翻边成形试验平台,采用试验的方式来研究变角度增量翻边成形过程中管料的成形性能,以实现对破裂的预测和控制。采用数码显微镜对制件的网格数据进行测量和提取,并选用插值法对数据进行拟合处理,分析了变角度增量翻边成形过程中的应变加载路径和制件变形区域的减薄情况,最终得到关于T2紫铜管在变角度增量翻边成形工艺下的成形极限曲线。对成形极限曲线进行分析和研究,得到了圆管翻边制件破裂区和安全区的应变分布,实现了制件破裂的预测和控制。In incremental flanging of thin-walled circular tube components,tube material is prone to fracture,wrinkling and other defects,and the evolution of material deformation mechanism is complex and very sensitive to loading conditions,which makes it difficult to predict and control the fracture of tube material in the incremental flanging forming.Therefore,in order to solve this problem,for T2 copper,a variable angle incremental flanging experiment platform of metal tube was built,and the forming performance of tube material in the variable angle incremental flanging process was studied by experiments to realize the prediction and control of fracture.Then,the mesh data of part was measured and extracted by digital microscope,and the data were fitted by interpolation method.Furthermore,the strain loading path and the thinning conditions of deformation area of parts in the variable angle incremental flanging process were analyzed,and the forming limit curve(FLC)of T2 copper tube under the variable angle incremental flanging process was obtained.Finally,through the analysis and research of FLC,the strain distributions in the fracture and safety areas of circular tube flanging parts were obtained,and the prediction and control of part fracture were realized.

关 键 词：变角度 增量翻边成形 圆管翻边 T2紫铜 破裂 成形极限曲线 

分 类 号：TG336[金属学及工艺—金属压力加工]