摘要
为了提高某型号发动机低压壳体铸件合格率,对壳体加工后轴承冷却孔缺陷问题进行分析,提出了工艺改进措施。采用内窥镜检查、剖切检查,确定缺陷形貌及产生位置,运用仿真模拟软件对原铸造工艺方案进行模拟,基于凝固过程仿真结果以及产品结构分析,确定了缺陷产生原因为温度场不协调及缺乏有效补缩源。针对缺陷产生原因提出工艺改进措施,改进冷铁设计及加快充型速度优化凝固温度场,添加冒口增加缺陷部位补缩能力。改进措施应用后,仿真模拟结果显示,原最先凝固区域凝固时间延迟,冒口及缺陷上方均可以提供补缩,建立了顺畅的补缩通道,消除了原问题部位的疏松缺陷。小批量产品验证结果表明,产品合格率大幅提高,加工后未见疏松缺陷问题,解决了型号研制问题,保证产品批量交付。
For improving the qualification rate of complex shell,the mechanism of fluorescence loosen defects was described by using section check,endoscopy and numerical simulation.The process improvement measures were put forward.It was determined that the causes of defects were uncoordinated temperature field and lack of effective feeding source based on the simulation results of solidification process and the analysis of product structure.Through optimizing temperature field,adding source to feed and the feeding capacity of defect was enhanced.By using above measures,the simulation results show that the solidification time of the original first solidification area is delayed,a smooth feeding channel is established and the loose defects of the original problem area are eliminated.The verification results of small batch products show that the problem of fluorescence defects is eliminated,the qualified rate of products is improved and products are delivered in time.
作者
吴晓明
彭超
王玉
郭蓓
WU Xiaoming;PENG Chao;WANG Yu;GUO Bei(Xi'an Space Engine Company,Xi'an 710100,China)
出处
《火箭推进》
CAS
2021年第4期96-102,共7页
Journal of Rocket Propulsion
基金
国家重点研发计划项目(2020YFB1710100)。
关键词
复杂壳体
缺陷分析
工艺改进
数值模拟
补缩通道
complex shell casting
defect mechanism
optimization
numerical simulation
feeding channel
作者简介
吴晓明(1991-),男,硕士,研究领域为液体火箭发动机型号管理及铸造工艺。
