近几年来,各种速硬自硬砂造型法相继出现,其中以有机粘结剂混制的自硬砂具有再生容易、造型和落砂的生产率高等优点,正在很多工厂中逐渐推广普及。由于这类有机自硬砂的添加剂加入量少,可用时间较短,因此,砂与添加剂的快速混合就更为重要。特别是使用再生砂时,只加新砂所需添加剂量的55～80％进行混制,硬化速度更快,可用时间更短。而硬化剂加入量稍有变动,就会给硬化速度和型砂强度带来很大的影响,故必须严格控制配 In recent years, a variety of quick-hardening and self-hardening sand modeling methods have appeared one after another, of which the self-hardening sand mixed with an organic binder has the advantages of easy regeneration, high productivity of molding and falling sand, and is gradually being popularized and popularized in many factories. Due to the small amount of such organic self-hardening sand additives available for a short time, the rapid mixing of sand and additives is even more important. In particular, the use of recycled sand, only add the required amount of sand added 55 to 80% for mixing, hardening faster, shorter life. The amount of hardener added a slight change, it will give the hardening rate and sand strength has a great impact, it must be strictly controlled with