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一、控制型砂水分对铸件质量的影响型砂的水分对型砂性能和铸件质量有重大影响。特别是湿型铸造,要想得到高质量的铸件和较低的废品率,必须使用性能合乎要求的型砂,即指型砂的水分、透气性和湿压强度等,其中又以控制水分最为重要。型砂的水分对铸件质量反映十分敏感,太干的型砂显得很脆,易破碎,起模困难,铸件容易产生掉砂、冲砂、砂眼等缺陷;太湿则型砂流动性不好,
First, the control of sand moisture on the quality of castings Molding sand moisture on the sand performance and casting quality have a significant impact. In particular, wet casting, in order to obtain high quality castings and low rejection rate, it is necessary to use the sand with satisfactory performance, namely the moisture content, permeability and wet strength of the sand, among which the control of moisture is the most important. Mold sand moisture is very sensitive to the quality of castings, too dry sand is very brittle, easy to break, mold difficulties, casting prone to out of sand, sand, trachoma and other defects; too wet sand is not good mobility,