渗氮齿轮硬化层设计及接触疲劳性能研究

Design of nitriding hardening case for gear and its contact fatigue property

采用滚子接触疲劳试验方法,测定了离子渗氮层在不同失效概率下的振幅A(τyz/HV)m ax值,以此作为齿轮渗氮层强度设计依据。通过对试验齿轮的接触应力有限元分析,得出正交切应力τyz沿深度方向上的分布,依照接触疲劳强度判据,设计出了齿轮渗氮层的硬度分布曲线,运用适当的离子渗氮工艺,实现预期设计的硬度,最后通过齿轮接触疲劳台架试验,验证所设计的渗氮硬化层是可靠的。

The amplitude A（τyz/HV）max value of nitriding case under varied failure probability was determined by means of roller contact fatigue test as a basis of case strength design.The orthogonal shear stress τyz profile versus depth from surface was obtained through finite element method analysis of test gear.In terms of strength obtained from roller contact fatigue test,the profile of nitriding case hardness was designed.The expected hardness was achieved by appropriate plasma nitriding process.Gear contact fatigue tests verify the reliability of designed nitriding case.