中速船用柴油机气缸盖铸件呛气孔问题的探讨

Study on the blowhole of a medium speed marine diesel engine cylinder head castings

中速船用柴油机气缸盖内部存在进排气道、冷却水道等,导致其结构复杂,截面变化很大,是较难铸造的柴油机零件之一,主要铸造方式为砂型铸造,铸造难度主要体现在过程复杂,成品率低,缺陷较多。CW200型柴油机目前在中速柴油机市场应用较为广泛,其缸盖在铸造过程中呛气孔成为了主要缺陷,本文探讨了呛气孔产生原因,提出了防止措施并阐述了其验证结论,以期对同类零件铸造工艺设计有所帮助。

There are inlet channels,exhaust channels and cooling channels in the medium speed marine diesel engine cylinder head.The structure is complex,and the changes in cross section is very large.It is one of the most diffi cult parts of the diesel engine for casting and the main way for casting is sand casting.The difficult of casting mainly manifests in the complicated process,low yield and moredefects.The CW200diesel engine currently is widely used in the medium speed diesel engine market.Casting blowhole is the mainly defect in the casting process for the CW200cylinder head.This paper discusses the reasons for the formation of blowhole and puts forward the measures to prevent and verify the conclusion,with a view to similar parts of the casting process design help.