外螺纹铜管拉深成形过程的有限元模拟  

Finite element simulation of drawing process of outer-spiral-rib copper tube

作　　者：刘赣华[1] 黄武新[1] 

机构地区：[1]江西理工大学机电工程学院,江西赣州341000

出　　处：《锻压技术》2007年第3期38-41,共4页Forging & Stamping Technology

摘　　要：利用非线性有限元仿真软件MARC,研究了外螺旋凸筋管成形过程的三维弹塑性有限元模拟技术。对外螺纹铜管的拉深成形过程进行了模拟,得到了成形过程中工件内部的应力和应变分布规律。结果表明,拉拔过程中,管料发生轴向延伸,但各部分延伸量不均匀,最大延伸变形发生在筋底中心部分。在周向,整体上管料发生压缩变形,但在筋底部分产生一定的延伸,应变为正;径向发生压缩变形。在定径区及铜管离开定径区后,轴向应力均为拉应力,但沿壁厚分布不均匀;同样,拉拔周向应力沿壁厚方向也呈不均匀分布,出定径区后在筋底区的外表面为负,内表面为正。Three-dimensional elastic-plastic finite element technology of the forming process of outer-spiral-rib tube was studied with the aid of nonlinear FEM software MARC. Drawing process of outer-spiral-rib copper tube was simulated. The stress-strain distribution discipline in steady-state was obtained. The results show that in the drawing process, the tube produces axial elongation, but the prolongation is not uniform at different parts of copper tube. The ultimate elongation distortion occurs in the core of rib bottom. In the circumferential direction, the tube produces compression deformation on the whole, but at the bottom of ribs, it produces some elongation and the strain is plus. In the radial direction, it occurs compression deformation. At and after fixed-diameter area, axial stress is all tensional stress, but it distributes nonuniform along the thickness. Similarly, drawing circumferential stress also distributes nonuniform along the thickness, it is minus at the outer surface of the rib-bottom zones after fixed-diameter area and it is plus at the inner surface.

关 键 词：外螺纹铜管 拉拔 弹塑性有限元法 

分 类 号：TG359[金属学及工艺—金属压力加工]