greensand

These molds are dimensionally more accurate than greensand molds but are more expensive.
这种模具在尺寸上比湿型砂更准确但更加昂贵。
Greensand molding is the least expensive method of making molds.
They are stronger than greensand molds and impart better dimensional accuracy and surface finish to the casting.
这种比湿型砂模要更强韧而且有更好的尺寸准确性和表面稳定性。
There are three basic types of sand molds: greensand, cold-box, and no-bake molds.
砂模有三种基本类型：湿型砂，冷箱砂和免烘烤砂模。