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前言 从1951年开始我厂就试验和应用了球墨铸铁。1957年试制成功柴油机的球墨铸铁曲轴,并一直坚持使用。实践证明,球墨铸铁曲轴较之锻钢曲轴,不但成本低,而且有良好的使用性能。但是由于镁球墨铸铁长期存在的夹渣、缩松缺陷没有彻底解决,废品率总在20％以上;而且绝大部份废品是在机械加工完成后磁粉探伤时才发现,损失更大,有时甚至影响产品任务的按期完成。几年来我厂进行过不少试验研究,也取得了一定成效,但质量一直不能稳定。
Foreword Since 1951, our factory has experimented and applied ductile iron. 1957 Diesel ductile iron crankshaft trial success, and has always insisted on the use. Practice has proved that ductile iron crankshaft crankshaft than forged steel, not only low cost, but also has good performance. However, magnesium slag ductile iron long-existing slag, shrinkage defects are not completely solved, the rejection rate of more than 20%; and most of the waste is found after the completion of magnetic particle inspection, greater loss, and sometimes even Affect the product tasks completed on schedule. Over the past few years I plant a lot of pilot studies, but also achieved some success, but the quality has not been stable.