近年来,铸造生产上自硬砂发展很快,应用越来越广泛。无论是以有机物为粘结剂或是以无机物为粘结剂的自硬砂,均较粘土砂(或称烘模砂、干模砂)有它独特的优点。如型砂有良好的流动性,易成型,型芯轮廓清晰;强度高便于装配组芯;溃散性好,出砂方便,减轻劳动强度等等。在铸造工艺 In recent years, the production of hard sand casting rapid development, more and more widely used. Whether it is an organic binder or an inorganic binder, self-hardening sand has the unique advantages over clay sand (or baking sand and dried sand). Such as sand has good fluidity, easy molding, core outline clear; high strength to facilitate the assembly of the core group; good collapsibility, easy sand production, reduce labor intensity and so on. In the casting process