提高铸铝合金洁净度的理论及工艺研究

从机理上对浮游精炼法进行了理论分析，认为增加熔剂量可以提高除气效果，但过量的熔剂又可能会给铝液带来二次反应夹杂；H]含量达到平衡浓度前，增加除气时间可以提高除气效果；随着静置时间的延长，H]含量有一个先减少后增大的趋势。采用旋转吹气一熔剂法净化铝液，以净化后铝液的H]含量为考察目标，按照均匀理论设计了净化参数的多因子实验。对实验结果进行逐步回归和线性回归分析，确定了旋转吹气一熔剂法工艺规范：精炼剂加入量0．2％；除气时间10min；静置时间15min。

Theoretical and technological research on improving cleanliness of casting A1 alloy

Based on the mechanism analysis of floating refinement, it＇s concluded that the increase of flux quantity can improve degassing effect; however, the excess flux probably results in secondary reaction inclusion in liquid aluminum; the increase of degassing time can improve degassing effect before the equilibrium concentration of H is reached; and H content decreases first and then in- creases with the prolongation of stewing time. In order to determine the H content in liquid aluminum after purification by rotary blowing-flux method, a multi-factor experiment for purification parameters was designed according to uniform design theory. The rotary blowing-flux process specifications were determined based on the stepwise regression and linear regression analyses of the experimental results： the addition of the refining flux is 0.2%, the degassing time 10 min and stewing time 15 rain.