The invention discloses a
drying method for a lost foam, and the
drying method comprises the following steps of: step 1, sending a coated foam mold to a
coating drying room, and pre-drying the coatedfoam mold under the condition of circulating hot air, wherein the temperature of the circulating hot air is 30-35 DEG C, the
wind speed is 1.5M / S-2.5M / S, the wind pressure is 0.1Pa-0.6Pa, the humidityof the drying room is 30%-35%, and the
drying time is 2h-3h; step 2, sending the foam mold pre-dried in the step 1 to a stokehold drying room, and drying the foam mold under the condition of the circulating hot air, wherein the temperature of the circulating hot air is 30-50 DEG C, the
wind speed is 0.5M / S-1.5M / S, the wind pressure is 0.1Pa-0.6Pa, the
humidity of the drying room is 15%-20%, and the
drying time is 6h-8h. The invention further discloses a preparation method for the lost foam. The invention has the organic combination of realizing the
humidity, the flow of air and the temperature, prevents the
saturated water vapor in the
coating from being in an expanded state, and the water loss outside the
coating being dried and shrunk quickly to cause the phenomenon of coating
cracking.