高强度高韧性球墨铸铁曲轴铸造技术

Casting Production Technique of High Strength-High Toughness Nodular Iron Crankshaft

为了提高球墨铸铁曲轴的强韧性和铸造质量、降低铸造废品率,研究了曲轴的微合金化技术、铁液共晶点控制技术、球化处理技术、曲面分型方法和组织均匀化正火工艺,成功生产出高强韧性球墨铸铁曲轴。球铁曲轴抗拉强度由原来的872 MPa提高到927 MPa,冲击韧度由26 J/cm2提高到40 J/cm2,缩松缺陷由原来的1.44%降低到0.19%。

In order to increase the strength,toughness of the nodular iron crankshaft and improve casting quality,a series of investigations were carried out on the mini-amount alloying technique,control technique of iron melt eutectic point,nodularizing treating technique,curved mould parting method and the structure-uniformizing normalization process and,as the result,the high-strength and high toughness nodular iron crankshaft was successfully developed.The tensile strength of the crankshaft was increased from original 872 MPa to 927 MPa,its impact toughness was increased from 26 J/cm2 to 40 J/cm2,the shrinkage-caused rejection rate was reduced from 1.44% to 0.19%.