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我厂从1970年开始成批地生产175,295型柴油机,在这两种柴油机上以稀土——镁球墨铸铁制造的零件计有曲轴、凸轮轴、汽门摇臂等34种。原材料采用本溪Z15生铁,球铁回炉铁及废钢。按一般冲入法工艺进行生产,情况基本良好。处理时采用自制合金(含镁8~9%;稀土氧化物6．25~7．0%,硅40~50%)1．5~1．6%放在浇注包底冲入铁水。在72年11月以前,我们采用了一般工厂所采用的大剂量,多次孕育的工艺,即:孕育剂总量为0.75~1.0
Since 1970, our factory has produced 175,295 diesel engines in batches. There are 34 kinds of crankshafts, camshafts and valve rocker arms for parts made of rare earth-magnesium ductile iron on both diesel engines. Raw materials used Benxi Z15 pig iron, ductile iron and scrap steel. According to the general law into the process of production, the basic situation is good. When processing, 1.5 to 1.6% of self-made alloy (8 to 9% of magnesium, 6.25 to 7.0% of rare earth oxide, 40 to 50% of silicon) is poured into the molten iron at the bottom of the casting bag. Before November 72, we adopted the high-dose, multiple-birth process used in the general factory, that is, the total amount of inoculant was 0.75-1.0