论文部分内容阅读
前言 用硅酸乙酯水解液作为型壳粘结剂,其代表缺陷是型壳内表面有析出物,并产生以下几种铸造缺陷。 1.要求晶粒细地的零件得不到应有的细化效果。 2.铸件表面有麻坑。 3.铸件内部有夹砂存在。 一、硅酸乙酯水解液型壳内表面析出物的形态及对铸件质量的影响。 我车间生产的某航空发动机中的燃气涡轮导向器、自由涡轮导向器、20GJ废气涡轮增压器中的涡轮和叶轮,均属带叶片的整
Preface The use of ethyl silicate hydrolyzate as a shell binder, the representative of the defects is that the surface of shell type precipitates, and produce the following casting defects. 1. Requires grain fine parts can not get the desired refinement effect. 2 castings surface Ma Hang. 3. There is sand inside the casting. First, the ethyl silicate hydrolyzate shell surface morphology of the precipitate and casting quality impact. The gas turbine guide, free turbine guide, turbine and impeller in the 20GJ exhaust gas turbocharger in aeroengine produced in our workshop belong to the whole blade with blade