一、概况(一)问题的提出:八十年代来,随着对外开放政策的的实施,我国与国外合作生产的工厂增多,不少合作生产的工厂对铸件提出了一个要求,即铸件需采用树脂砂铸造工艺生产,否则,设法进行合作。另外,国内生产的发展,也提出了需要高质量的铸件,不少人提出采用树脂砂铸造工艺。 I. Introduction (I) Proposal of the Issue: Since the 1980s, with the implementation of the policy of opening up to the outside world, there have been more and more co-production factories in China and abroad. Many co-production factories have set a requirement on the casting, that is, Resin sand casting process, otherwise, try to cooperate. In addition, the development of domestic production, also proposed the need for high-quality castings, many people put forward the resin sand casting process.