一、化学粘结剂砂的分类及发展化学粘结剂砂是区别于物理粘结剂砂(如粘土砂等)的另一类砂系,它可概分为:加热硬化、室温自硬和吹气冷芯盒硬化等几类。随着工业的发展,对铸件质量,特别是对铸件尺寸精度和表面光洁度的要求越来越高,要求铸 First, the chemical binder sand classification and development Chemical binder sand is different from the physical binder sand (such as clay sand, etc.) of another type of sand system, which can be divided into: heat hardening, self-hardening at room temperature and Inflatable cold box core hardening and so on. With the development of industry, the requirements on the quality of castings, especially on the dimensional accuracy and surface finish of castings are getting higher and higher,