针对不同含Ni量、渗氮层深度和喷丸强化组合的 42CrMo齿轮开展弯曲疲劳试验,探究了不同工艺组合的齿轮弯曲疲劳极限提升效果,为齿轮抗疲劳制造提供工艺指导.基于随机森林算法分析了不同工艺组合齿轮的表面硬度、渗氮层深度、表面残余应力和含Ni量对弯曲疲劳极限的贡献度,采用多元回归建立了考虑表面硬度、渗氮层深度、表面残余应力和含 Ni 量的齿轮弯曲疲劳极限预测公式.预测值与试验值相比,最大误差可以控制在 7.80％以内,为工程应用中快速、低成本评估齿轮弯曲疲劳极限提供了理论依据.
Study on Influences of Ni Content,Nitriding Hardening Depth,and Shot Peening on Bending Fatigue Performance of 42CrMo Gears
Single tooth bending fatigue tests were conducted on 42CrMo gears with different com-binations of Ni content,nitriding hardening depth,and shot peening.The effectiveness of different process combinations on improving the bending fatigue limit of gears was investigated,providing process guidance for gear fatigue resistance manufacturing.Additionally,the contribution of surface hardness,nitriding hardening depth,surface residual stress,and Ni content to the bending fatigue limit of gears with different process combinations was analyzed using the random forest algorithm.A multiple regression model considering surface hardness,nitriding hardening depth,surface residual stress,and Ni content was established to predict the bending fatigue limit of gears.Comparing the predicted values with experimental values,the maximum error is controlled within 7.80％,providing a theoretical basis for the rapid and low-cost assessment of gear bending fatigue limit in engineering applications.
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