一、前言从前,我厂生产中、大型铸铁件是采用粘土砂干型工艺,由于粘土砂干型工艺劳动条件差——黑、脏、累,生产效率低,所以,在无产阶级文化大革命后与沈阳铸造研究所共同试验水玻璃流态砂,取代了粘土砂干型工艺,改善了造型的劳动条件,提高了造型生产效率,但在长期生产实践中发现水玻璃流态砂存在着两个难以克服的缺点:(1)铸件容易产生缩 First, the foreword In the past, in our factory production, the large-scale cast iron piece is uses the clay sand dry type craft, because the clay sand dry craft work condition is poor - black, dirty, tired, the production efficiency is low, therefore, after the proletarian cultural revolution And Shenyang Foundry Institute of joint test of water glass fluid sand, sand clay instead of the dry process to improve the modeling of labor conditions and improve the modeling production efficiency, but in the long-term production practice found that there are two water glass flow sand Difficult to overcome the shortcomings: (1) casting prone to shrink