铝合金铸件渗漏的预测及防治

Prediction of the Leakage of Aluminium Alloy Casting and It's Prevention

在简述了铝合金铸件产生渗漏机理的基础上,介绍了当前铝合金铸件渗漏研究的主要进展。一是对判据函数模型、连续性方程-达西定律的模型等预测铝合金铸件中产生渗漏的数学模型的研究,其次是在实际生产中通过对铝合金熔体进行处理或采用新的工艺等措施来预防铝合金铸件的渗漏。各种预测渗漏的模型虽都具有一定的适用性,但同时也有自身的局限性,都不能精确的预测缩松的产生。研究人员针对各自领域中的具体条件确定的很多有效的防治渗漏的方法对生产应用中预测铸件缩孔缩松的产生具有一定的指导意义,然而这种方法需要耗费大量的时间、人力及物力。因此为了更精确的预测铸件中缩孔和缩松的产生部位及形状尺寸,应该将计算机模拟同实际生产结合起来,根据各领域的特定条件灵活的、发展的运用这些模型和方法,从而达到消除或减少铸件渗漏的目的。

Two aspects of the study on the leakage of aluminium are introduced after the leakage mechanism of aluminium alloy casting is described. Three mathematical models, criteria function models, continuing equations-Darcy's law models, hydrogen diffusion-controlled pore growth models, are studied. Some measures of predicting leakage of casting in practice are summarized, such as the treatment of aluminium liquid and the adoption of new technics, Many different models of pore formation and growth have been proposed, however, each of these models has limitation and is not precision enough. Measures in practice have certain significance to the study of predicting leakage of casting, however, to obtain these measures cost a lot of time, manpower and material resource. In order to predict pore formation and growth of aluminium casting more precision, these mathematical models and practical measures should be integrated felicitously in different condition.