采用普通湿型生产铸铁大件往往因大量夹砂而报废。我厂自1978年以来采用在湿型上刷酒精快干涂料的办法,生产重1～3吨的铸件,消除了铸件夹砂缺陷,提高了成品率。缩短了生产周期,并节约了燃料,使成本大大降低。现将我厂在湿型上刷酒精快干涂料的经验所得介绍如下。一、大件湿型 1.在型砂中加入0.4～0.5％苏打粉(Na_(?)CO_3)进行膨润土活化处理。试验证明,加入苏打粉进行活化处理后,型砂的湿压强度有明显提高(如图1),透气性也有增强, The use of ordinary wet cast iron bulky scrap is often due to a large number of sand. Since 1978, our factory has adopted the method of brushing alcohol fast-drying paint on wet type to produce castings weighing 1 to 3 tons, eliminating casting sand inclusion defects and improving the yield. Shorten the production cycle and save fuel, so that the cost is greatly reduced. Now I plant wet brush on the alcohol-based quick-drying coating experience gained as follows. First, the large wet type 1 in the sand by adding 0.4 to 0.5% soda ash (Na _ (?) CO_3) bentonite activation. Tests show that, after adding activated carbon soda ash, sand wet strength has significantly increased (Figure 1), permeability also increased,