避免铝合金挤压棒材产生粗晶的模具结构研究

Study for Die Structure of Avoiding Coarse Grain in Aluminum Alloy Extruded Bars

铝合金棒材应用广泛,其生产过程中的主要问题是粗晶的出现,目前解决这一问题的方法主要是通过化学成份与挤压工艺的改进以及采用均匀化处理。通过分析挤压过程中金属成形的特点,介绍了实践中通过改变模具结构而改变金属的变形程度和提高成形过程中的压应力从而可以减少或避免粗晶产生的模具结构,并且经实践证明该方法是可行有效的。

Aluminum alloy bars are applied widely. The main problem for production process is coarse grain. The main methods to solve this problem are mainly improved by chemical composition and extrusion technique and introduction of homogenization treatment. Through analyzing the characteristics of the metal in the process of extrusion forming, it was introduced that coarse grain can be reduced or avoided by aid of deformation degree and change of metal by changing the die structure and improving pressure stress during forming. The practice shows that it is feasible.