铸铁件气孔可分皮下气孔,分散孔,蜂窝孔,裂隙状孔,夹杂孔和呛孔等。气体的产生过程有三种:溶于铁水气体的再析出、型芯发气、碳氧反应。气孔的形成还取决于铸型的发气性,透气性—冷却速度和浇注速度等因素的综合效果。本文否认由铁水中气体所产生的气孔,必然均匀地分布子铸件的看法。并以实例否定关于浇注速度对气孔影响的传统论述,推荐了适宜的浇注速度系数S为1.2。 Cast iron stomata can be divided into sub-stomata, scattered holes, honeycomb holes, crack-shaped holes, inclusions and choke holes and so on. There are three kinds of gas production process: dissolved in molten iron and then re-precipitation, core gas, carbon and oxygen reaction. The formation of blowholes also depends on the combined effect of the mold’s gas evolution, gas permeability - cooling rate and casting speed. This article denied the gas holes generated by the hot metal, the inevitable uniform distribution of sub-casting view. And to negate the traditional discussion on the effect of pouring speed on the pore, an appropriate pouring speed coefficient S is 1.2.