镁合金压铸压室内慢压射过程数值模拟  

Numerical simulation for slow shot process in die casting shot sleeve of magnesicem alloy

作　　者：周乐[1,2] 刘正[1] 杨光伟[3] 毛萍莉[1] 吴伟[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [3]长春汽车工业高等专科学校招生就业办公室,长春130000

出　　处：《沈阳工业大学学报》2013年第3期298-303,共6页Journal of Shenyang University of Technology

基　　金：国家科技支撑计划资助项目(2011BAE22B06)

摘　　要：为了研究压室内慢压射过程对压铸充型过程金属液流动形态的影响,通过建立描述冲头、压室及金属液之间边界条件与初始条件关系的数学模型来描述金属液在压室内的流动状态.应用Flow3D模拟软件模拟了压室内金属液的流动状态,分析了不同冲头速度对金属液流动状态的影响.结果表明:压室内的金属液初始流动状态会随着慢压射的速度变化而改变.若冲头速度以临界速度运动时,压室内的气体会顺利排出;当冲头速度高于或低于临界速度时,都会使气体卷入金属液中随金属液一起进入型腔,从而增加铸件的气孔缺陷含量.In order to investigate the effect of slow shot process in the shot sleeve on the flow pattern of liquid metal in the filling process of die casting mold, a mathematic model which could describe the relationship between the boundary and initial conditions among the plunger, shot sleeve and liquid metal was established to elaborate the flow pattern of liquid metal in the shot sleeve. The flow pattern of liquid metal in the shot sleeve was simulated with Flow3D software, and the influence of plunger speed on the flow pattern of liquid metal was analyzed. The results show that the initial flow states of liquid metal in the shot sleeve will change with the variation of slow shot speed. If the plunger speed is equal to the critical speed, the air in the shot sleeve will be successfully vented. When the plunger speed is higher or lower than the critical speed, the air will be entrapped into the liquid metal and filled into the die cavity together with the liquid metal, and thus, the content of such defects as porosity in the castings increases.

关 键 词：压铸 压室 慢压射 冲头速度 流动形态 数值模拟 

分 类 号：TG249.2[金属学及工艺—铸造]