这项工艺是上海机械制造工艺研究所等单位自1974年年底开始研制的,在1975年上海机铸一厂召开的双快水泥自硬砂现场经验交流会及1977年在北京通县召开的北京、上海、沈阳三地区双快水泥自硬砂技术协调会,基本肯定了下述效果: 1)减轻劳动强度,提高劳动生产率1～2倍(与同样手工操作比较)。 2)可简化芯骨,废除大量元针,降低铸件生产成本(尚未完整统计,初步估计至少在 The process is the Shanghai Machinery Manufacturing Technology Research Institute and other units since the beginning of the end of 1974 developed in Shanghai Machine Casting Factory held in 1975 Shuangkeng cement self-hardening sand site exchange of experiences and held in Beijing Tong County in 1977 in Beijing , Shanghai and Shenyang, Shuangkui cement self-hardening sand technical coordination meeting basically affirmed the following effects: 1) reduce labor intensity, improve labor productivity 1 to 2 times (compared with the same manual). 2) can simplify the core, abolish a large number of needles, reduce casting production costs (not yet complete statistics, initially estimated at least