一、前言:本文重点介绍铸造用831 A 粘结剂代替桐油、合脂的有关试验及生产应用情况。目前,各地大多都用桐油、合脂作为砂芯粘结剂。桐油砂就其性能来说较为理想,但来源困难、价格高,因此逐步被化学粘结剂砂(主要是合成树脂砂)所代替。合脂是制皂过程中的副产品,价格较便宜,来源广,许多性能与桐油接近。但是合脂砂也存在许多缺点,如湿强度低,砂芯易产生“蠕变”而报废。流动性差、发气大,并在烘烤及浇注过程中放出大量可燃 First, the preface: This article focuses on the casting with 831 A binder instead of tung oil, grease the relevant test and production applications. At present, most of them use tung oil and fat as sand core binder. Tung oil sand is ideal for its performance, but the source is difficult, the price is high, so gradually replaced by chemical binder sand (mainly synthetic resin sand). Grease is a by-product of the soap making process and is less expensive, more popular, and has many properties that are similar to tung oil. However, there are also many shortcomings of synthetic sand, such as low wet strength, sand core prone to “creep” and scrapped. Poor mobility, big gas, and in the baking and pouring process release a large number of flammable