我厂从一九五七年起采用球墨铸铁制造跃进牌(NJ130,NJ230)汽车曲轴,共生产了球墨铸铁一万五千多吨,曲轴二十五万多根。球铁件由曲轴、凸轮轴两个品种,扩大为现生产的33个品种,占汽车灰铸铁产量的35～45%。开始生产镁球铁曲轴时,质量不稳定,废品率高。1964年我厂和一机部机械院及南京工学院共同试制成功稀土镁球墨铸铁,并且在熔炼工艺和铸造工艺方面进行了一系列改进,质量有了显著的提高。现将稀土镁球墨铸铁曲轴铸造生产工艺介绍如下: I plant from 1957 with ductile iron manufacturing Yuejin licensing (NJ130, NJ230) car crankshaft, a total of more than 15,000 tons of ductile iron, crankshaft more than 250,000 roots. Nodular iron from the crankshaft, camshaft two varieties, expanding to the current production of 33 varieties, accounting for the output of automotive gray cast iron 35 to 45%. When starting to produce magnesium nodular iron crankshafts, the quality is unstable and the rejection rate is high. In 1964 I plant and a machine-building machinery and Nanjing Institute of Technology successful trial of rare earth magnesium nodular cast iron, and smelting and casting process in a series of improvements, the quality has been significantly improved. Now rare earth magnesium nodular cast iron crankshaft production process described below: