阅读说明：本技术 一种覆膜砂壳型铁砂负压铸造工艺 (Negative-pressure casting process for precoated sand shell type iron sand ) 是由 于建军 刘建新 姚永奎 于 2020-05-12 设计创作，主要内容包括：本发明涉及一种覆膜砂壳型铁砂负压铸造工艺,属于铸造工艺技术领域。包括制壳、喷涂料、组装、铁砂埋箱、抽真空、浇注、废气净化处理、拆箱、铁砂筛选发明的有益效果是：采用铁砂激冷,能够实现铸件的快速冷却,保证铸件的致密度,提高铸件质量。减少了铸造型砂和粘结剂的使用,减少了铸造废气的产生,改善了铸造环境。(The invention relates to a negative-pressure casting process of precoated sand shell type iron sand, belonging to the technical field of casting processes. The invention comprises the following steps of shell making, paint spraying, assembling, iron sand burying, vacuumizing, pouring, waste gas purification treatment, box dismantling and iron sand screening, and has the beneficial effects that: the adoption of iron sand chilling can realize the rapid cooling of the casting, ensure the density of the casting and improve the quality of the casting. The use of casting molding sand and a binder is reduced, the generation of casting waste gas is reduced, and the casting environment is improved.)