普通的铸造工艺是铸型与冒口采用同一种造型材料。因两者的传热性能相同,胃口中缩孔(见图a)呈典型的“V”型,体积仅占整个冒口体积的10～14％,即真正补缩给铸件的体积只有6～10％,其冒口的补缩效率很低。要获得组织致密质量高的铸件,就要在设计铸造工艺时,冒口的几何尺寸足够大,能使铸件凝固收缩时有足够的液态金属补充 Ordinary casting process is casting and riser using the same modeling material. Due to the same heat transfer performance between the two, the crater in the appetite (see Fig. A) shows a typical “V” shape with a volume of only 10-14% of the total riser volume, that is, 10%, its feeding efficiency is very low riser. To obtain dense and high-quality castings, it is necessary to design the casting process, riser geometry is large enough to make the casting solidification shrinkage sufficient liquid metal supplement