铸造行业翻砂铸造大、中型铸件,过去都是沿用粘土砂、水玻璃自硬砂、有机酯自硬砂等,劳动强度大,生产效率低。在无产阶级文化大革命和批林批孔、学习无产阶级专政理论的推动下,国家建委建材研究院、上海机械制造工艺研究所、上海机床铸 Foundry industry foundry casting large and medium-sized castings. In the past, clay sands, water glass self-hardening sands, and organic ester self-hardening sands were used, which resulted in high labor intensity and low production efficiency. Under the promotion of the Great Proletarian Cultural Revolution and the approval of Lin Piao, learning the theory of the dictatorship of the proletariat, the National Construction Committee Building Material Research Institute, the Shanghai Institute of Mechanical Manufacturing Technology, and Shanghai Machine Tool Casting