Ω槽道翅片管挤压过程数值模拟及模具优化  

Numerical simulation of extrusion process and optimization of die structure for Ω grooved finned-tube

作　　者：孙晓龙[1] 沈健[1] 闫晓东[1] 杜鹏[1] 张飞[1] 王忠堂[2] 

机构地区：[1]北京有色金属研究总院加工事业部,北京100088 [2]沈阳理工大学材料科学与工程学院,辽宁沈阳110159

出　　处：《锻压技术》2014年第9期58-62,共5页Forging & Stamping Technology

摘　　要：Ω槽道翅片管具有精密的内槽道结构,尺寸精度要求高,成形难度大。利用有限体积法对Ω槽道翅片管的挤压成形过程进行了模拟计算,通过分析对比模拟得到的挤出速度场和料头形貌,探讨了不同的模具结构对金属流动和管材成形的尺寸精密度的影响。模拟结果表明,采用非等长工作带和6.5 mm的模芯设计时,翅片管挤压出口金属的流速场最为均匀,尺寸精密度最好。按最优结构设计模具并进行挤压实验,挤压实验和模拟仿真得到的料头形貌吻合较好,实验测得的挤压速度和模拟得到的速度基本相符,误差在8.75%以内,表明模型构建的较为准确。Ω channel finned-tube with a high precision inner-channel structure was quite difficult to form for the high requirement in precision. The extrusion process of Ω channel finned-tube was simulated by finite volume method. The influence of different die structures on metal flow and tube precision was discussed by comparing and analyzing the extrusion velocity field and head shape from simulation. Simulated results show that the velocity field of finned-tube extrusion exit is the most uniform and the sample precision is the best when the die was designed with non-equal length working channel and the die core of 6. 5 mm. The die was designed in optimization structure and then conducted in the extrusion experiment. The head shape from calculation agrees with that from the extrusion experiment. The extrusion speed measured by experiment is also matched with that from simulation, and the deviation is less than 8.75%. It is showed that the calculation model is quite accurate.

关 键 词：Ω槽道翅片管 挤压 有限体积法 数值模拟 

分 类 号：TG376.9[金属学及工艺—金属压力加工]