目前所知的冷硬合成树脂,根据它们的硬化时间,投入生产的重点,一方面是在机械化成批生产上,另一方面是在单件小批生产上,一种以聚氨酯为基的新粘结剂填补了这两个领域之间还存在的空隙。四十年代末,铸造厂在克洛宁壳型铸造法中由于应用了合成树脂化学粘结剂,从而引入了使用有机化学粘结剂的制芯工艺,快速硬化有机粘结剂的急剧发展和制芯工作的机械化使成批制造芯子出现了完全新的面貌。壳型、CO_2水玻璃法、热芯盒和冷芯盒法的逐步发展,今天经济的成批生产型芯不再是想像中的事了。铸件数量多,证明使用相应的机器设备是有效的,这在单件和小批生产时就成问题,设备费用必须经济才行。化学硬化粘结剂的优点,特别是快速和可以控制硬化过程使单个芯子和铸型的制造也发展到用化学粘结砂制造,在六十年代初铸型和大芯子已经用新的吠喃树脂或新创造的酚醛树脂生产。由于以下的要求:铸件尺寸精确;造型面积利用要经济;制芯和制型配合要合拍,不用费用昂贵的储芯库和不需要熟练工人,这些就成为当时加速发展冷硬和快硬粘结剂的一些原因。现在大体上吠喃树脂、酚醛树脂以及钻的缩合物已用作型砂粘结剂,在小范围内还使用二氧化碳或液态催化剂硬化的水泥和水玻璃来制造铸型和芯子,在铸钢件中,特别是对裂纹敏感的铸件使用了醇酸树脂-异氰酸盐反应物,硬化时间长和可控性少使这种方法在德国应用较多,而这种方法在美国和用粘土砂的国家还远未推广。 The currently known chilled synthetic resins, which are put into production according to their hardening time, are, on the one hand, mechanized batch production and on the other hand small batch production of a polyurethane-based Binders fill gaps that still exist between these two areas. In the late 1940s, the foundry, in the Kronen shell casting method, introduced a core-making process using organic chemical binders due to the use of synthetic resin chemical binders to rapidly cure the rapid development of organic binders The mechanization of the core making a complete new look of mass-produced cores. Shell-type, CO 2 water glass method, hot-box and cold-box method of gradual development of today’s economic mass-produced core is no longer an imaginary thing. The large number of castings proves that the use of appropriate machinery and equipment is effective, which is problematic in single-piece and small-batch production, and the cost of equipment must be economical. The advantages of chemically hardened binders, and in particular the rapid and controlled hardening process, have also enabled the manufacture of individual cores and molds to be made with chemically bonded sand. In the early 1960s molds and cores had been used with new Varnished resin or newly created phenolic resin. Due to the following requirements: precise casting size; economical use of the molding area; co-production of core and formwork without costly storage cores and without the need for skilled workers have accelerated the development of chilled and fast-setting bonds Some reasons for the agent. At present, basically, a bark resin, a phenol resin, and a condensate of diamonds have been used as molding sand binders, and carbonates or liquid catalyst-hardened cement and water glass are also used in a small area to make molds and cores. In particular, alkyd resin-isocyanate reactants are used, especially for crack-sensitive castings, and have long curing times and low controllability, making this method more useful in Germany, and this method is used in the United States and with clay sand The country is still far from promotion.