消除WE43A镁合金流线型偏析的工艺方法

Process Method for Eliminating Streamline Segregation of WE43A Magnesium Alloy

WE43A镁合金机匣类铸件的结构特点是整体壁厚薄,壁厚差大,另外因WE43A镁合金中含Zr元素,在铸造成形过程中易出现偏析缺陷,而流线型偏析是镁合金偏析中比较典型的偏析种类。解决流线型偏析的方法与冷隔类似,分别对调整产品浇注温度、铸型表面增设网格、调整浇注系统3种方案进行了生产验证,最终消除该缺陷,产品合格率由38.9%提升至81.2%。

The structural characteristics of WE43A magnesium alloy casing castings are that the overall wall thickness is thin and the wall thickness difference is large.In addition,because WE43A magnesium alloy contains Zr element,segregation defects are prone to occur in the casting process.Streamlined segregation is a typical type of segregation in magnesium alloy segregation.The method to solve streamline segregation is similar to that of cold shut.In this paper,three schemes of adjusting the pouring temperature of products,adding grids on the surface of the mold,and adjusting the gating system were respectively verified in production.Finally,the defect was eliminated,and the product qualification rate was increased from 38.9%to 81.2%.