原砂是型砂中的基本组成部分,按降低生产成本和保证铸件质量的原则,适当地选用原砂,从来就是铸造生产中的重要环节。 在过去,型砂的粘结剂主要是粘土,我们对原砂的认识,也是在此基础上建立起来的。现在,树脂砂的使用范围日益扩大,对于这一新的粘结剂体 The original sand is the basic component of the sand, according to reduce production costs and ensure the quality of castings principle, the appropriate selection of the original sand, casting has always been an important part. In the past, sand binder was mainly clay, our understanding of the original sand is also built on this basis. Now, the use of resin sand is expanding, for this new binder body