本文通过对不同材质的铸态球铁曲轴的实体疲劳强度试验,提出结构尺寸相同的实体曲轴的表面应力分布状况在同一部分是基本相同的,所以用同样工艺获得的曲轴其疲劳值是相近的、只有改变对曲轴疲劳最敏感的部位的应力状态,曲轴疲劳值才能出现显著变化,改变曲轴应力的最佳方案是曲轴圆角的滚压工艺。 In this paper, the physical fatigue strength tests of cast iron ducts with different materials are proposed. The results show that the surface stress distributions of solid crankshafts with the same structural dimensions are basically the same in the same part, so the fatigue values ​​of crankshafts obtained by the same process are similar , Only by changing the stress state of the parts that are most sensitive to the fatigue of the crankshaft, the crankshaft fatigue value can change significantly. The best way to change the stress of the crankshaft is the crankshaft fillet rolling process.