七、球铁的铸造性能及铸型工艺是怎么回事?铸型工艺的好坏对铸件质量影响很大。在制订铸型工艺时,要根据球铁的凝固特点和铸造性能来考虑。再按照铸件的用途、尺寸、形状、壁厚和批量,结合各厂的具体生产条件,以三结合的方式制订各个球铁件的铸型工艺。问:球铁在凝固时有何特点?答:一切合金都有它自己的凝固特点。这 Seven, ductile iron casting performance and mold technology is how the case? Casting process quality castings have a great impact on the quality. Casting process in the formulation, according to the characteristics of the ductile iron and casting properties to consider. According to the use of castings, size, shape, wall thickness and batch, combined with the specific production conditions of each plant, the combination of three ways to formulate the casting process of each piece of ductile iron. Q: What are the characteristics of ductile iron during solidification? A: All alloys have their own solidification characteristics. This