双级分流模方管挤压过程分析  

Analysis of square pipe extrusion process of two-stage porthole die

作　　者：玄东坡 黄东男[1] 薛江平[1] 孙磊 XUAN Dong-po;HUANG Dong-nan;XUE Jiang-ping,;SUN Lei(School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学材料科学与工程学院

出　　处：《塑性工程学报》2018年第4期40-45,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51364027);内蒙古自然科学基金资助项目(2013MS0708);内蒙古工业大学中青年学术骨干资助项目(10381007)

摘　　要：在常规分流模挤压高强空心铝合金型材过程中,由于挤压力过大,常导致堵模和分流桥开裂现象。为此,提出了双级分流模挤压的方法,在常规分流模前增加了具有导向分流作用的导流模,意在平衡金属流动均匀性和提高模具使用寿命。采用有限元结合试验分析的方法对常规分流模和双级分流模挤压方管过程进行了对比研究。研究结果表明：采用双级分流模挤压时,挤出型材头部横断面标准速度场偏差比常规分流模降低了37%,金属流动行为更均匀;挤压力比常规分流模降低了11%;分流桥和模芯位置的最大等效应力比常规分流模分别降低了18.7%和21.3%。In the process of extruding high strength hollow aluminum alloy profile by the conventional porthole die,the mold clamping and shunt bridge cracking phenomenor are often caused by the excessive extrusion pressure. Therefore,two-stage porthole die extrusion method was proposed,a diversion die with guiding diversion function was added to the front of the conventional porthole die,aiming at balancing the metal flow uniformity and improving the service life of the die. A comparative study on conventional porthole die and two-stage porthole die extrusion process was carried out by finite element method combined with the experimental analysis method. The results show that compared with the conventional porthole die and two-stage porthole die extrusion,the standard velocity field deviation of the cross section of the extruded profile head is reduced by 37%,the metal flow behavior is more uniform; the extrusion pressure is reduced by 11%,and the maximum equivalent stress of the porthole bridge and the die core are reduced by 18. 7% and 21. 3% respectively.

关 键 词：双级分流模 数值模拟 金属流动 挤压 

分 类 号：TG379[金属学及工艺—金属压力加工]