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水溶性铸型的制造方法,主要是通过CO_2气体使铸型很快硬化,而且在造型时材料能象水那样容易浇注成型。这个方法与通常的铸型砂一样,可在现场对氧化铝粉砂与铝酸钠进行混碾,然后使铝酸钠在CO_2气体中进行分解20～60％(重量)以后再造型,造型后在短时间内就可完成硬化反应,得到干压强度高的水溶性铸型。另外,铝酸钠中Na_2O/Al_2O_3的克分子量比为1.3～1.7,水分在50％左右时不能够分开保存,造型前不必用粘结剂调配。在这个发明中,氧化铝粉砂与铝酸钠的配合比例是:氧化铝粉砂重量在100时,用3～
Water-soluble mold manufacturing methods, mainly through the CO 2 gas to make the mold quickly hardened, but also in the shape of the material as water as easy casting. This method is the same as the usual sand, alumina sand and sodium aluminate in the field can be mixed grind, and then make sodium aluminate in CO 2 gas decomposition 20 ~ 60% by weight after modeling, modeling in the A short period of time to complete the hardening reaction to obtain a high dry-pressed water-soluble mold. In addition, sodium aluminate Na 2 O / Al 2 O 3 molecular weight ratio of 1.3 to 1.7, about 50% moisture can not be kept separately, do not have to use adhesive formulations before deployment. In this invention, the proportion of alumina powder and sodium aluminate is as follows: when the weight of alumina powder is 100,