一种全废钢生产铸态QT950-4曲轴的方法

A Method of Producing As-Cast QT950-4 Crankshaft with All Scrap Steel

为提高曲轴力学性能,在铁型覆砂铸造工艺条件下,研究了炉料配比、球化工艺、开箱时间等因素对曲轴基体组织以及力学性能的影响。采用全废钢配料,熔化过程加入碳化硅,球化过程中加入Cu、Sb合金的工艺方法。结果表明:铸件组织得到了细化,铸件强度及伸长率提高,生产出了高强度、高韧性的铸态QT950-4曲轴。

In order to improve the mechanical properties of crankshaft,the effects of charge composition,spheroidizing process,opening time and other factors on the matrix structure and mechanical properties of crankshaft were studied under the condition of sand-lined metal mold casting.The process methods such as using all scrap steel,adding silicon carbide in melting process and adding Cu and Sb alloy in spheroidizing process,were applied.The results show that the microstructure of the castings is refined,the strength and elongation of the castings are improved,and the as cast QT950-4 crankshafts with high strength and toughness have been produced.