原砂温度及空气湿度对冷芯盒法砂芯强度的影响

Effects of the Sand Temperature and Air Humidity on the Strength of Cold-box Sand Cores

冷芯盒法制芯环境温度和湿度会随季节不同而变化，为保证砂芯质量应采取的措施是：在原砂温度偏高时，应适当缩短混砂时问及芯砂存放时问；而在原砂温度偏低时，应适当延长混砂时问。为减少砂芯在湿度较大环境中存放时的强度下降，可在混砂时加入抗湿剂或增加粘结剂中聚异氰酸酯的比例。

Air temperature and humidity on the shop floor of cold-box coremaking may vary according to seasons, thus some measures should be taken to improve the quality of coldbox sand cores: when the sand temperature is higher, the mixing time and processing time of the core sand may be properly shortened, when lower, the mixing time lengthened. The decrease in strength of sand cores can be reduced by adding an anti-moisture agent or increasing proportion of polyisocyanate in the mixture when the cores is stored up under the condition of greater air humidity.