通过实测平扳铸件湿砂型的温度场,计算了湿型中的水分蒸发系数和水分凝聚系数,讨论了评价湿型工作特性的无量纲参数K。实验结果表明,湿型中的水分蒸发系数和水分凝聚系数与砂型密度、初始水分含量和铸件一铸型界面平均温度有关。K值越小,湿型工作性能越差,容易引起铸件中的夹砂、结疤和胀大等缺陷。 By measuring the temperature field of wet sand type in Pingban castings, the water evaporation coefficient and moisture condensation coefficient in wet type were calculated, and the dimensionless parameter K to evaluate the wet working characteristics was discussed. The experimental results show that the moisture evaporation coefficient and moisture cohesion coefficient in wet type are related to sand type density, initial moisture content and average temperature at the interface of casting and mold. The smaller the K value, the worse the wet work performance, easily lead to sand casting, scarring and swelling and other defects.