It is understood that during the process of lost foam casting, the deformation of castings is mainly caused by improper operation and control during the molding, drying, assembly, coating, and vibration packing processes of the lost foam model. The quality or uniformity of the lost foam model during the drying process of the coating layer directly affects the quality of the casting, and the equipment used during the drying process also directly affects the cost price of the casting
In the past, the commonly used drying methods for white mold patterns in the lost foam casting industry were natural ventilation drying or heating ventilation drying. This type of drying method generally has a long drying cycle, and white molds usually require 7-30 days of drying to reduce the moisture in the white mold to an appropriate level.
In addition, the equipment used in the current drying process is generally boiler equipment, which has problems such as uneven baking heat energy, long drying time, substandard moisture content, and high energy consumption, which is not environmentally friendly. However, using electric steam or electric heating directly for drying still consumes a lot of electricity, has high costs, and cannot control temperature and humidity, which also affects its drying quality
Therefore, providing a high-efficiency, environmentally friendly, and energy-saving equipment or method for lost foam casting drying today - the PD-45GS lost foam casting coating dryer and the PD series heating, drying, and dehumidification integrated machine are urgently needed in the field of lost foam casting. The specific drying steps are as follows:
Step S1: Place the lost foam pattern in the drying room, raise the temperature in the drying room, and dry the lost foam pattern at 40 ℃~45 ℃. Dehumidify while drying to reduce the humidity to 30%~33% to obtain the pre dried lost foam pattern
Step S2: Raise the temperature in the drying room to 48 ℃~50 ℃, reduce the humidity in the drying room to 25%~28%, and then perform constant temperature and humidity to obtain a lost foam pattern after one drying
Step S3: Raise the temperature in the drying room to 50 ℃~55 ℃, reduce the humidity in the drying room to 12%~15%, and obtain a secondary drying lost foam pattern
In steps S1 to S3, use hot air for heating and dehumidification
Compared with existing technologies, controlling heating capacity, air volume, and outlet temperature can meet production requirements and reduce equipment investment costs for enterprises; Greatly shorten the drying time while ensuring low deformation rate of the lost foam pattern
In the lost foam drying industry, many manufacturers have chosen to transform after understanding the investment return ratio of the PD-45GS lost foam casting coating dryer and the PD series heating, drying, and dehumidification integrated machine. Moreover, numerous cases of lost foam pattern drying have also confirmed the efficient and energy-saving effect of this equipment in lost foam pattern drying
