呋喃树脂砂应用于铸钢件上,在国内越来越引起人们的重视。据有关文献介绍,国外有的国家和铸钢行业已经极为广泛的采用这种型砂,由于它具有良好的溃散性和退让性(清砂方便、减少铸件裂纹产生)、铸型尺寸精度高等特点,我厂一九八○年初在学 Furan resin sand used in steel casting, more and more people in the country attention. According to the relevant literature, some countries in foreign countries and the steel casting industry have adopted this type of sand very extensively. Because of its good collapsibility and concession (easy to remove sand and reducing the occurrence of cracks in castings) and high dimensional accuracy of the mold, I plant in early 1980 to learn