锻压技术

ZK60镁合金带内筋矩形管穿孔针挤压工艺仿真和实验研究

英文标题：Numerical simulation and experimental study of needle piercing extrusion of ZK60 magnesium alloy rectangular tube with inner rib

作者：马俊梁胜龙

单位：苏州工业职业技术学院

关键词：ZK60镁合金带内筋矩形管穿孔针挤压数值模拟

分类号：TG376.9

出版年,卷(期):页码：2014,39(11):139-144

摘要：

基于Deform-3D有限元软件，以汽车车架用ZK60镁合金带内筋矩形管为研究对象，建立该规格管材穿孔针挤压过程的三维刚塑性有限元模型，并在模拟过程中采用局部网格细化和自适应网格技术。模拟研究发现：运用网格细化和自适应网格技术可有效避免网格过度畸变、折叠等缺陷，提高计算过程的稳定性；该规格ZK60镁合金管材挤压工艺适合选用1000 t铝合金挤压机；当挤压时间t＞10 s后，流速均方差降低至Fsdv＜2 mm·s-1，流速均匀性得到改善；突破模具的管材温度基本保持稳定或略有上升，在462~484 ℃范围内。通过挤压实验获得结果与模拟值吻合良好，挤压力最大误差为16.4%，模口管材温度最大误差低于5%。

Based on Deform-3D finite element software, a three-dimensional rigid-plastic finite element model of needle piercing extrusion process was established for ZK60 magnesium alloy rectangular tube with inner rib used in automobile frame, in which a local mesh refinement and adaptive grid technology during the simulation were adopted. The simulation research shows that excessive distortion and folding defects can be avoided effectively, and the stability of the calculation process can be improved. 1000 tons of aluminum alloy press is fit for producing ZK60 magnesium alloy tube. When the extruding time t>10 s, the mean-square deviation of velocity decreases to Fsdv＜2 mm·s-1, so the uniformity of the flow rate is remarkably improved. Furthermore, the temperature of the tube remains stable or increases slightly within the range of 462-484 ℃.The values obtained from extrusion experiment are in good agreement with the simulation results, and the maximum error of extrusion force is 16.4% and the maximum error of tube temperature in the die exit is below 5%.

基金项目：

江苏省高校“青蓝工程”项目；省级示范性高职院校建设项目（苏教高（2011）23号）

马俊(1973-)，男，硕士，副教授

参考文献：

［1］魏文婷. ZK60 镁合金等温挤压成形及组织性能变化规律研究[D]. 武汉: 武汉理工大学, 2010.Wei W T. ZK60 Magnesium Alloy Isothermal Extrusion Forming and Organization Performance Change Law Research [D]. Wuhan: Wuhan University of Technology, 2010.
［2］席海霞. ZK60 镁合金挤压过程数值模拟研究[D]. 哈尔滨：哈尔滨理工大学, 2009.Xi H X. Study on Numerical Simulation of Extrusion Forming for ZK60 Magnesium Alloys[D]. Harbin:Harbin University of Science and Technology, 2009.
［3］石磊, 李继文, 李永兵, 等. 高精度AZ31镁合金薄壁管件等温挤压后的组织与性能[J]. 热加工工艺, 2009, 38(20): 42-45.Shi L, Li J W, Li Y B, et al. Microstructure and mechanical properties of thin wall AZ31 magnesium alloy pipes with high precision prepared by isothermal extrusion technology [J]. The hot Working Processes, 2009, 38(20): 42-45.
［4］赵辉, 彭晓东, 王艳光, 等. 变形镁合金的塑性改善研究现状[J]. 稀有金属, 2012, 31(1): 161-166.Zhao H, Peng X D, Wang Y G, et al. Research status about plasticity improvement of wrought magnesium alloys[J]. Chinese Journal of Rare Metals, 2012, 31(1): 161-166.
［5］贺岩松，杨诚．镁合金在轻量化汽车中的应用[J]．汽车工艺与材料，2002，(6)：25-27.He Y S, Yang C. Application of magnesium alloy in automotive industry [J]. Automobile Technology and Material, 2002,(6):25-27.
［6］王忠堂, 贺琳, 梁海成, 等. ZK60 镁合金管材热挤压成形组织演变规律[J]. 金属热处理, 2011, 36(12): 74-77.Wang Z T, He L, Liang H C, et al. Microstructure evolvement of ZK60 magnesium alloy during tube hot extrusion [J]. Heat Treatment of Metals, 2011, 36(12): 74-77.
［7］席海霞, 于彦东, 周浩, 等. ZK60 镁合金棒材挤压过程有限元分析[J]. 哈尔滨理工大学学报, 2010, 15 (1): 60-63.Xi H X, Yu Y D, Zhou H, et al. Finite element analysis of extrusion forming of ZK60 magnesium alloy bar[J]. Journal of Harbin University of Science and Technology, 2010, 15(1): 60-63.
［8］李荣兵. ZK60 镁合金薄壁矩形管等温挤压仿真研究[J]. 锻压技术, 2013, 38(6): 170-173.Li R B. Numerical study of isothermal extrusion process of ZK60 magnesium alloy thin-wall rectangular tube [J]. Forging ＆ Stamping Technology, 2013, 38(6): 170-173.
［9］Zhou J, Li L, Duszczyk J. Computer simulated and experimentally verified isothermal extrusion of 7075 Al through continuous ram speed variation[J]. Journal ofMaterials Processing Technology, 2004, 146(2): 203-212.
［10］覃银江, 潘清林, 何运斌, 等. ZK60 镁合金高温流变本构模型[J]. 中南大学学报: 自然科学版, 2010, 41(5): 1774-1778.Qin Y J, Pan Q L, He Y B, et al. Constitutive modeling for elevated temperature flow behavior of ZK60 magnesium alloy[J]. Journal of Central South University: Science and Technology, 2010, 41(5): 1774-1778.
［11］赵震, 陈军, 吴公明. 冷温热挤压技术[M]. 北京：电子工业出版社, 2008.Zhao Z, Chen J, Wu G M. Cold/Warm/Hot Extrusion Technology [M]. Beijing: Electronics industry Press, 2008.
［12］陈浩, 赵国群, 张存生, 等. 薄壁空心铝型材挤压过程数值模拟及模具优化[J]. 机械工程学报, 2010,46(24): 34-39.Chen H, Zhao G Q, Zhang C S, et al. Numerical simulation of extrusion process and die structure optimization for a hollow aluminum profile with thin wall[J]. Journal of Mechanical Engineering, 2010,46(24): 34-39.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】