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在实际生产中,球铁件经常使用压边冒口。由于压边宽度较窄,它在球铁件凝固的液态收缩阶段有一定的补缩能力,而在共晶结晶阶段压边处凝固,使铸件完全封闭而能充分利用其自身膨胀,对凝固末期的第二阶段收缩进行补缩,以获得健全铸件。因此压边冒口的补缩作用与中小球铁件的凝固——收缩特性相吻合。当然它也具有自身的一定特点:压边冒口没有明显的冒口颈,这对冒口——铸件补缩系统的冷却——凝固条件和铸型温度场的分布产生影响,给工艺设计带来了新因素。本文对压边冒口的大小、压边宽度、铸型及原材料条件和冒口设计进行讨论。试验是在生产条件下进行的。熔炼设备为2.5吨热风水冷冲天炉。出炉温度1380～1420℃。炉渣氧化铁含量<5％。采用稀土镁硅铁合金球化剂,球铁化学成份为(％):C3.7～3.9。终Si2.7～2.9,Mn<0.5,S<0.03,
In actual production, ductile iron parts often use crimping risers. Due to the narrow width of the blank holder, it has a certain ability of shrinkage during the liquid-phase shrinking of the ductile iron piece, and solidifies at the blanket during the eutectic crystallization stage to completely close the casting and make full use of its self-expansion. The second phase of contraction shrinks to obtain sound castings. Therefore, the role of crimping riser and small pieces of iron pieces of solidification - contraction characteristics are consistent. Of course, it also has some of its own characteristics: the pressure riser no obvious riser neck, which riser - casting cooling system cooling system - casting conditions and the temperature distribution of the mold have an impact, to the process design with A new factor came. This article discusses the size of crimping riser, blank width, mold and raw material conditions and riser design. The test is carried out under production conditions. Melting equipment for the 2.5 tons hot air water cupola. Baked temperature 1380 ~ 1420 ℃. Slag iron oxide content <5%. Using rare earth magnesium ferrosilicon alloy nodulizer, ductile iron chemical composition (%): C3.7 ~ 3.9. Si2.7 ~ 2.9, Mn <0.5, S <0.03,