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在日本工业技术院二官三男提出的特公昭55—25946专利中,介绍了一种比空气式及水冷式冷却能力高得多的高温型砂新冷却方法,即:在型砂中加入液态氮或固体二氧化碳,使高温型砂在短时间内冷却至室温。冷却后完全没有水分等残留物,是一种极为方便的无公害冷却法. 这种方法可在型砂的循环使用过程(混砂—造型—铸造—清砂—筛分—贮存)中施用,即可在混砂过程中或是在筛分后加入液态氮或固体二氧化碳. 液氮或固体二氧化碳的加入量随冷却型砂的温度,数量及要
In Japanese Patent Office No. 5-252596 filed by two men and three officers of the Japan Industrial Technology Institute, a new cooling method for high-temperature sand having a much higher cooling capacity than air-type and water-cooling is introduced, that is, liquid nitrogen or solid Carbon dioxide, high temperature sand in a short period of time cooled to room temperature. It is an extremely convenient, pollution-free cooling method after it is completely cooled down without any residue from water etc. This method can be applied during the recycling of the sand (sand-molding-casting-sand-screening-storage) Liquid nitrogen or solid carbon dioxide can be added during the sand mixing or after sieving The amount of liquid nitrogen or solid carbon dioxide added varies with the temperature, amount and amount of cooling sand