刚性好,且不易变形的铸型,可大大减少球铁铸件的缩松。为了探讨铸型与铸件之间力的相互作用的计算方法,特使用专门仪器(图1)测量球铁收缩前的膨胀对型壁的压力。由于所用造型材料的热膨胀系数小,并加上水、空气冷却,从而排除了型腔的热膨胀影响。直径为100毫米的球形铸件,完全可以保汪铸件与型壁间产生最低的摩擦 Rigid, and not easily deformed mold, can greatly reduce the ductile iron castings. In order to investigate the method of calculating the force interaction between the mold and the casting, special pressure gauge (Figure 1) is used to measure the pressure on the mold wall caused by the expansion of the ductile iron before it shrinks. Due to the low coefficient of thermal expansion of the molding material used and the addition of water and air cooling, the thermal expansion of the cavity is ruled out. Spherical diameter of 100 mm castings, can guarantee the minimum friction between casting and casting wall