锻压技术

网格重构在铝合金空心型材分流模挤压过程数值模拟中的应用

英文标题：Applications of mesh reconstruction technology in FEM simulation of porthole die extrusion for hollow Al-alloy profile

作者：黄东男张志豪李静媛谢建新

单位：北京科技大学内蒙古工业大学

关键词：铝合金空心型材分流模挤压网格重构数值模拟

分类号：TG379

出版年,卷(期):页码：2010,35(6):128-133

摘要：

采用作者等人开发的基于Deform-3D与Pro/Engineer的网格行重构技术，对典型大断面空心铝合金工业型材分流模挤压全过程（包括焊合过程）进行了模拟分析。结果表明，采用某企业的现行模具设计方案，挤压初始阶段，型材两侧焊合面率先产生焊合，中间部位焊合面的焊合相对滞后，导致挤出型材断面的中间位置金属流量不足，同时模芯出现弹性偏移，易造成壁厚超差；挤压稳态阶段，模孔附近型材的最高温度为520 ℃、焊合室内的静水压力约为A6005铝合金屈服强度的5~10倍、模芯弹性偏移量为0.43 mm，基本满足型材挤出温度、焊合质量及壁厚尺寸公差的要求。

Applying the mesh reconstruction technology based on Deform-3D and Pro/Engineer software, taking the typical large and hollow Al-alloy industry profile as an example, the whole extrusion process (including welding process) was simulated. The results show that,using an enterprise's porthole die design,in the beginning of extrusion, the welding of the middle-welding plane is delayed compared with the two side-welding planes, which leads to the shortage of the metal in the middle of the profile cross section as well as the elastic offset of the mandrel which is apt to causing the size deviation of the profile thickness. In the stage of steady extrusion, the highest temperature near the die orifice is about 520 ℃，the hydrostatic pressure in welding chamber is about 5-10 times than the yield stress of A6005, the mandrel offset is about 0.43 mm, that means the extrusion temperature, welding quality and the thickness-size deviation meet the industry requirements.

基金项目：

国家重点基础研究发展计划资助项目(2007CB613703)；材料成形与模具技术国家重点实验室开放课题研究基金(09\|01)

参考文献：

［1］谢建新, 刘静安. 金属挤压理论与技术[M]. 北京: 冶金工业出版社, 2001.
［2］Jo H H, Lee S K, Jung S C. A non-steady state FE analysis of Al tubes hot extrusion by a porthole die[J]. Journal of Materials Processing Technology, 2006, 173(2): 223-231.
［3］Liu G, Zhou J, Duszczyk J. FE analysis of metal flow and weld seam formation in a porthole die during the extrusion of a magnesium alloy into a square tube and the effect of ram speed on weld strength[J]. Journal of Materials Processing Technology, 2008,200(13):185-198 .
［4］村上哲.アルミニうムの合金押出材と加工技術[J] . 塑性と加工,2008,49(567):25-30.
［5］程磊,谢水生,黄国杰,等. 分流组合模挤压过程的有限元分步模拟[J].系统仿真学报,2008,20(24):6603-6608.
［6］邸利青,张士宏.分流组合模挤压过程数值模拟及模具优化设计[J]. 塑性工程学报,2009,16(2):123-127.
［7］Jung M L, Byung M K, Chung G K. Effects of chamber shapes of porthole die on elastic deformation and extrusion process in condenser tube extrusion[J]. Materials and Design, 2005, 26(4):327-336.
［8］Li L, Zhang H, Zhou J. Numerical and experimental study on the extrusion through a porthole die to produce a hollow magnesium profile with longitudinal weld seams[J]. Materials and Design, 2008, 29(6): 1190-1198.
［9］Wu X H., Zhao G Q, Luan Y G, et al .Numerical simulation and die structure optimization of an aluminum rectangular hollow pipe extrusion process[J]. Materials Science and Engineering A, 2006,435(5):266-274.
［10］Yang D Y, Kim K J. Design of processes and products through simulation of three-dimensional extrusion[J]. Journal of Materials Processing Technology, 2007, 191(13):2-6.
［11］谢建新,黄东男,李静媛,等. 一种空心型材分流模挤压焊合过程数值模拟技术: 中国, 200910088960.7[P]. 20090715.
［12］黄东男,李静媛,张志豪,等.方形管分流模双孔挤压过程中金属的流动行为[J].中国有色金属学报,2010,20(3): 487-495.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】