论文部分内容阅读
离心浇铸柴油机大型厚壁气缸套出现的云斑状偏析目前国内外都存在,是一项需进一步解决的技术关健,本文总结了我厂二十年来离心浇注的生产实践经验,特别是经过最近三年多的大量试验研究,对形成“云斑”状偏析的机理和其影响的主要因素作了一定的探讨,提出了“二个结晶凝固层和四个结晶凝固区”的分层结晶凝固原理,并制订了工艺操作规程。目前我厂大型厚壁气缸套外层“云斑”偏析得到了基本消除,内层“云斑状偏析得到了控制和改善。
Centrifugal cast diesel engine large thick-walled cylinder liner appeared at present at home and abroad appear cloud segregation, is a need to further solve the technical key, this paper summarizes my plant twenty years of centrifugal casting production practice, especially after the recent three A large number of years of experimental study, the formation of “cloud-like” segregation mechanism and the main factors affecting the make a certain discussion, put forward “two crystalline solidified layer and four crystalline solidification zone,” the principle of hierarchical crystallization solidification , And developed a process of operating procedures. At present, I plant large thick-walled cylinder liner outer “cloud spot” segregation has been basically eliminated, the inner "cloud-like segregation has been controlled and improved.