一、概述 目前,我国民用机械行业的熔模铸造,硅酸乙酯粘结剂还未能代替水玻璃粘结剂,其原因主要是硅酸乙酯与水玻璃的价格相差悬殊。按武汉地区价格,硅酸乙酯40是水玻璃价格的26倍。然而水玻璃型壳存在的质量问题也是相当普遍的。以武汉精密铸造厂的生产情况为例,水玻璃型壳的主要问题,一是型壳带来的废品损失大,一九八三年铸件废品率为8.2％,其中因型壳质量原因的废品占总废品的43.1％,二是铸件质量不高,对一些形状复杂、表面要求高的铸件,往往样品 First, an overview At present, China’s civil machinery investment casting, ethyl silicate binder has not yet replaced the water glass binder, the main reason is the price of ethyl silicate and water glass difference. According to the price in Wuhan, ethyl silicate 40 is 26 times the price of water glass. However, the quality problems of water glass shell are also quite common. Take the production situation of Wuhan precision foundry as an example. The main problems of water glass shell are as follows: First, the loss of scrap brought by the shell is large. In 1983, the rate of casting scrap was 8.2%, of which the scrap Accounting for 43.1% of the total waste, the second is the quality of castings is not high, for some complex shapes, high surface requirements of castings, often samples