摘要
针对某超大型镁合金吊舱薄壁铸件圆角处缩孔缺陷频发的铸造难题,首先针对铸件结构、合金材料及铸造工艺等开展缺陷成因分析。提出在现有浇注系统局部增加内浇道并优化内浇道形状的方案,以提高冒口对缺陷区域的补缩能力,同时抑制氧化夹渣等缺陷的引入。然后,采用铸造有限元模拟方法,对优化工艺开展铸造过程仿真分析,包括流场和温度场、固相率及温度云图切片等,确认了上述优化方案的可行性。最后开展铸造试验验证。结果证明:优化工艺有效解决了超大型镁合金薄壁铸件圆角处的缩孔缺陷。本研究对其他超大型镁合金薄壁铸件的铸造工艺设计具有借鉴意义。
Aiming at the shrinkage casting problem occurred frequently at the rounded corner of a ultra-large magnesium alloy aircraft pod thin-wall casting,firstly,the defect causes were analyzed from the casting structure,alloy materials and casting technology,and the scheme of adding ingates in the existing pour system and optimizing the ingate geometry was proposed to enhance the feeding capacity of the riser for the defective zone and inhibit the introduce of inclusions.Then,the casting finite element simulation method was used to conduct the simulation analysis of the optimized casting process,including the flow field and temperature field,solid phase rate and temperature cloud map slice,etc,and the feasibility of the optimized scheme was determined.Finally,the casting test verification was carried out.The results show that the optimized process successfully solves the shrinkage defect at the rounded corner of the ultra-large magnesium alloy thin-wall casting.The research has practical significance for designing and optimizing other ultra-large magnesiumalloy thin-wall castings.
作者
郭居魁
马骁
任凌宝
惠雪丽
李永新
GUO Jukui;MA Xiao;REN Lingbao;HUI Xueli;LI Yongxin(Xi'an Aviation Brake Technology Co.,Ltd.,Xingping 713100,China;School of Material Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《热加工工艺》
北大核心
2024年第11期138-143,149,共7页
Hot Working Technology
基金
国家自然基金科学基金项目(52061040)
中国博士后科学基金项目(2021M692512)。
关键词
镁合金
超大薄壁件
飞机吊舱
铸造仿真
magnesiumalloy
ultra-large thin-wall casting
aircraft pod
casting simulation
