宝珠砂在壳型铸造工艺中的应用

宝珠砂因其粒型圆整、耐火度高、化学性质稳定、强度高、回用率高等特点,其在覆膜砂中的应用得到迅速推广,而宝珠砂在壳型铸造中的应用也日益增加。目前宝珠砂壳型精密铸造已经在铸铁、铸钢(包括不锈钢)等各种铸造合金中得到了广泛的应用,可部分替代失蜡精铸工艺,铸件尺寸精度可达CT7～CT6级,表面粗糙度Ra≤12.5μm,显著提高了铸件的生产率和铸件质量,同时极大地降低铸造成本、减少铸造废弃物排放。

Applications of Ceramic Sand in Shell Process

Ceramic sand was used widely in resin sand casting as the features of spherical grain shape,higher refractoriness,inert chemical property,high strength and higher reuse rate.Subsequently,shell investment casting with ceramic sand was used gradually.Now,ceramic sand shell casting was used widely to produce cast iron and cast steel and so on,which can partially replace investment casting.The dimensional precision of the castings can reach CT7-CT6with surface roughness of 12.5μm,greatly improving the product yield and casting quality as well as greatly decreasing casting cost and exhaustion of scrap.