飞机舱门钛合金精铸件浇注工艺研究

Investigation on Pouring Processing of Aircraft Doorframe Titanium Alloy Castings

对Ti6Al4V合金飞机舱门精铸件的结构进行分析,设计浇注工艺方案和浇注系统,对比底注式离心浇注、底注式静止浇注和顶注式静止浇注3种不同浇注方式的试验结果,结果表明3种浇注方式都可以实现该铸件的完整成形。底注式的离心浇注和静止浇注缺陷数量相近,集中缩孔主要在竖直肋板的T型连接处,缩松主要分布在竖直肋板上;离心浇注的气孔主要在底平板上的浇口附近,静止浇注的气孔主要在竖直肋板的顶部和上部。顶注静止浇注的缩孔、缩松缺陷较少,主要分布在底平板上,气孔主要出现在舱门铸件底平板的浇口附近。

Based on the analysis for framework of Ti6Al4V alloy aircraft doorframe castings, the pouring process and pouring system were designed. Comparing the bottom centrifugal casting, the bottom static casting and the top static casting, the results show that all above pouring methods can make castings integrally formed. The castings prepared by bottom centrifugal casting and by bottom static casting have a similar amount of defects. Shrinkages are mainly at the ＂T＂ connector of vertical rids and dispersed shrinkages are mainly at the vertical rids, blowholes are mainly near the sprue of bottom plate by centrifugal casting and the top of vertical rids by static casting. The shrinkage and dispersed shrinkage by top static casting are less, shrinkages distribute at the bottom plate and blowholes near the sprue of bottom plate.