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采用包外二次孕育,达到均匀添加硅铁孕育剂是较困难的,我厂浇注300系列柴油机球铁曲轴需用铁水量2～2.5吨。采用定量漏斗包外二次孕育后,球化级别和球径大小分别提高一级,使大断面球铁曲轴的球化稳定在1～2级,球径大小稳定在1～3级,大大提高了材质的机械性能。一、定量漏斗的形式:定量漏斗的结构如图1,锥型堵4为圆锥型,装料时由拉簧6的作用,将定量孔3堵住。导管5内径为φ15的钢管,能起锥型堵的导向作用,又使空气通到壳
It is more difficult to apply ferrosilicon inoculant evenly by using the secondary inoculation outside the package. The iron flux of 2 300 tons of molten iron required by our factory for casting 300 series diesel ductile iron crankshafts is more difficult. The use of quantitative funnel bag after the second inoculation, the level of balling and the size of the ball were increased by one level, so that the large section of the nodular iron crankshaft nodular stability in the 1 to 2, ball size stable at 1 to 3, greatly increased The mechanical properties of the material. First, the quantitative funnel form: Quantitative funnel structure shown in Figure 1, cone-shaped plug 4 is conical, loaded by the role of tension spring 6, the quantitative hole 3 blocked. The inner diameter of the pipe 5 φ15 steel pipe, can play the role of the role of cone-type block, but also through the air to the shell