摘要
确定半固态触变成形的边界条件,在半固态表观粘度耦合于流场的动量方程上,建立半固态AlSi7Mg充型过程的计算模型。对不同充填速度、浇口形状以及浇口设置位置下半固态成形过程进行模拟分析。结果表明:半固态合金的充填速度对流态及成形质量具有明显影响,与压铸相比,半固态浇口形状、设置位置等因素对充填流态影响相对较小,所以半固态工艺设计较为灵活。半固态压铸机的充填流量及充填压力取决于浇口面积、充填速度以及合金种类。充填速度决定半固态浆料流动形态,进而影响半固态制件的成形质量。
Based on the boundary conditions of forming processes of semi-solid AlSi7Mg slurry, a mathematic model of slurry flow coupled with apparent viscosity was established. The effects of the filling velocity and gate shape and located position on semi-solid forming quality and flow patterns were investigated with simulation. The results show that the filling velocity of semi-solid alloy presents a great effect on forming process, the gate shape and located position have little effects on the flow patterns compared with die casting, so the process design for semi-solid is flexible. The results demonstrate that the selection of filling discharge and pressure depends on the gate area, filling velocity and alloy type. The flow pattern of semi-solid slurry depends on filling velocity, which has a great effect on the semi-solid forming quality.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2004年第3期346-353,共8页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(59995440)
教育部博士点基金资助项目(1998000807)
