铸造工作者认为,硬度得当且紧实度比较均匀的铸型在液态金属静压作用下产生最小的型壁移动。这种铸型能复制出与模样尺寸一致的铸件。为实现此目的,用均匀填砂法填充造型室是绝对必要的。填充这类造型室的最有效方法是用压缩空气使型砂流态化,使型砂能以很高的速度进入造型室。在填充造型室时,为使型砂获得最大的流动性,采用双室结构的射砂头。内室A系重力 Foundry workers believe that the hardness and the more uniform solidity of the mold in the liquid metal static pressure generated minimal wall movement. This mold can replicate the same size as the castings. For this purpose, it is absolutely necessary to fill the modeling chamber with a uniform sand-filling method. The most efficient way to fill this type of modeling chamber is to fluidize the molding sand with compressed air so that the molding sand can enter the modeling chamber at a high velocity. In filling the modeling room, in order to maximize the mobility of the molding sand, the use of dual chamber structure of the shooting head. Interior A Department of gravity