一、前言型砂水份是型砂的重要性能之一。它直接影响型砂的湿强度、温透气性和流动性等。实践证明,控制型砂水份有着重要的意义。我厂生产拖拉机和汽油机铸件,全用潮模,并大部分用机器造型。因此,要求 First, the foreword Sand is one of the important properties of sand. It directly affects the wet strength of molded sand, warm air permeability and fluidity. Practice has proved that the control of sand water has an important significance. I plant the production of tractors and gasoline engine castings, all with tide mode, and most of the machine shape. So, ask