正火工艺对球铁曲轴硬度均匀性的影响

Influence of Normalizing Process on Hardness Uniformity of Crankshaft of Nodular Cast Iron

球墨铸铁曲轴经完全奥氏体化正火后 ,有良好的气硬性。通过调整正火温度和冷却方式 ,可直接获得截面硬度均匀的曲轴 ,提高切削加工效率 ,尤其是5 .5mm细长斜油孔的钻削加工。

Completely austenized and normalized crankshafts of nodular cast iron will possess good air hardenability.Adjustment of temperature and cooling way of normalizing can make the crankshaft obtain uniform hardness in its section.As a result,machining efficiency of the crankshaft,especially oblique slender oil hole of 5.5mm,has be raised.