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壳型铸造是造型方法上带有根本性改进的一种铸造方法.一般砂型,由于强度低,不得不采用比面砂多几倍的背砂作支持物,以支持金属液压,使金属凝固时构成一定的几何形状.这样,一方面增加了型砂周转量,另一方面由于砂型各部分的紧密度和强度不匀,难于将铸件尺寸固定在允许的公差以内,因而对铸件质量不易控制.壳型是利用热熔性树脂和硅砂作为造型材料的.由于树脂在硬化后强度很大,只需一层薄壳就可支
Shell casting is a method of casting with a fundamental improvement in the modeling method.General sand, due to the low strength, had to use several times more than the sand surface of the sand as a support, to support the metal hydraulic, metal solidification Constitute a certain geometry.Thus, on the one hand increased sand turnover, on the other hand due to the various parts of the sand tightness and uneven strength, difficult to cast the size fixed within the allowable tolerance, and therefore not easy to control the quality of castings. Shell Type is the use of hot-melt resin and silica sand as a modeling material.Because the resin after hardening strength, only a thin shell can be