(1. 北京交通大学 机械与电子控制工程学院, 北京 100044；
2. 河北科技大学 材料科学与工程学院, 石家庄 050054)
摘 要: 通过对半固态合金流变充型机理分析, 推导出可以定量计算半固态A356铝合金在圆管内流变充型极限长度的数学模型, 该模型包括了工艺参数和半固态A356合金的自身特性。 采用间接挤压铸造阿基米德螺旋线试样的方法对该数学模型进行了实验验证, 实验结果表明： 理论计算值与实验测定值之间的最大偏差小于8%； 该数学模型可以定量分析和估算工艺因素对充型能力的影响, 并可预测充型极限长度, 这对半固态合金流变成形工艺设计和模具设计都有参考价值。实验和理论计算还表明, 充型压力和充型速度是影响半固态合金充型能力的两个主要因素, 提高充型压力、 一定充型压力下适当减小充型速度都可以提高充型能力。
关键字: 半固态A356合金； 圆管； 充型能力； 理论计算； 极限长度
（1. School of Mechanical and Electronic Control Engineering,
Beijing Jiaotong University, Beijing 100044, China;
2. School of Material Science and Engineering,
Hebei University of Science and Technology, Shijiazhuang 050054, China）
Abstract: A mathematical model, which can be used to quantitatively calculate the limiting length of semi-solid A356 alloy rheological filling in round pipe, was deduced by analyzing the mechanics of semi-solid alloy rheological filling. This model includes the processing parameters and self-character of semi-solid A356 alloy. The mathematical model was verified in experiment with the method of indirect squeeze cast Archimedean spiral proof sample. And the experimental results show that the maximum deviation between the theoretical value and measured value is less than 8%. This model can be used for quantitative analysis and estimating effects of the craft factors on the filling ability, and can also predict the maximum filling length. It has the important reference value to design the semi-solid alloy rheoforming technology and mould. The results of experiment and theoretical calculation also indicate that the filling pressure and filling velocity are two major factors that affect the filling ability, and both increasing filling pressure and decreasing properly filling velocity can increase the filling ability.
Key words: semi-solid A356 alloy; round pipe; filling ability; theoretical calculation; limiting length
