很多铸造厂、特别是自动化铸造厂,由于砂箱尺寸不能轻易改变,致使型砂与铸件金属比例随着铸件大小形状不同而变化很大。自动化铸造厂典型的型砂金属比为3:1—10:1;因此,造型线上型砂温度必然随之发生变化。很多铸造厂,在生产较重铸件时都会遇到所谓热砂问题。调研表明,热砂问题发生在一 Many foundries, especially automated foundries, vary greatly in the size of the casting due to the size of the flask that can not be easily changed. The typical foundry metal ratio for automated foundries is 3: 1 to 10: 1; therefore, the temperature of the molding sand is bound to vary. Many foundries, in the production of heavier castings will encounter the so-called hot sand problems. Research shows that hot sand occurs in one