精密熔模铸造气门座圈缩孔缺陷及改进措施  

Shrinkage Cavity Defects in Investment Casting Valve Retainers and Improving Measurements

作　　者：杜子文[1] 徐晓都 

机构地区：[1]南充职业技术学院,四川南充637000 [2]四川南蕾气门座有限公司,四川南充637300

出　　处：《铸造技术》2017年第1期247-249,共3页Foundry Technology

摘　　要：对4G22发动机气门座圈在生产过程中出现缩孔缺陷进行分析,从型壳的制作工艺、铸件的浇注工艺出发,找出缩孔缺陷的产生原因,并提出了相应的改进措施:一是提高型壳的焙烧温度,延长型壳的焙烧时间;二是采用红壳浇注,适当降低冷却速度;三是调整金属液出炉温度及浇注温度;四是适当提高浇注速度,缩短浇注时间。结果显示,改进生产工艺后,缩孔导致的缺陷率由原先的13%左右下降到3%以下。The shrinkage cavity defects in 4G22 engine valve seat in production were analyzed from the production process of shell and the pouring process of castings, the reasons for the Shrinkage cavity defects were found out, and the corresponding solution measures were proposed： improving mold shell roasting temperature, extending roasting time; using red shell casting, reducing cooling speed; adjusting melting temperature and pouring temperature; increasing casting speed,shortening casting time. After improving production process, shrinkage cavity defects reduce from 13% to 3%.

关 键 词：气门座圈 熔模铸造 缩孔缺陷 改进措施 

分 类 号：TK406[动力工程及工程热物理—动力机械及工程] TG249.5[机械工程—精密仪器及机械]