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1983年以来,我厂用聚乙烯醇(PVA)——水泥自硬砂先后生产了C_41-400kg空气锤缸体,C_41-400kg、C_41-750kg空气锤活塞、阀体等铸件约200余吨,提高了铸件的成品率和质量,节约了能源,改善了劳动条件,降低了铸件成本。我厂使用该砂的工艺如下: PVA的聚合度为1700,醇解度为88％, 自硬砂的配方为:新砂(70/100目,含水量小于1％)100％,PVA水溶液(浓度为20
Since 1983, I plant with polyvinyl alcohol (PVA) - cement since the hard sand has produced C_41-400kg air hammer cylinder, C_41-400kg, C_41-750kg air hammer piston, valve castings, such as about 200 tons, Improve the casting yield and quality, save energy, improve working conditions and reduce the cost of casting. The process of using the sand in our factory is as follows: the degree of polymerization of PVA is 1700, the degree of alcoholysis is 88%, the formula of self-hardening sand is 100% of fresh sand (70/100 mesh, water content less than 1%), PVA aqueous solution Is 20