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

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