喷丸和电解抛光对齿轮弯曲疲劳强度的影响

Influence of shot peening and electropolishing on bending fatigue strength of gear

为提高渐开线齿轮齿根承载能力，研究了喷丸强度、喷丸覆盖率、电解抛光对齿根圆角表面完整性和齿轮弯曲疲劳极限的影响规律．依据啮合原理和APDL语言，对齿条型刀具展成的齿轮进行了参数化有限元建模，应用ANSYS／FE—SAFE软件对齿轮进行弯曲疲劳强度的仿真计算，并通过单齿弯曲疲劳试验进行了验证．结果表明：通过软件仿真的渗碳淬火齿轮弯曲疲劳极限载荷与试验结果相比偏大；对齿轮齿根进行喷丸，并非喷丸强度和喷丸覆盖率越高越好，而是存在最佳的喷丸工艺参数；对齿轮喷丸后再进行电解抛光，可以改善表面完整性，进一步提高齿轮的弯曲疲劳强度，但强化效果受初始喷丸工艺参数的影响．

To improve the bending fatigue strength of involute gear, the influences of shot peening intensity, coverage and electropolishing on surface integrity and bending fatigue limit were investigated. Based on meshing theory and ANSYS Parametric Design Language（ APDL）, the parametric finite element model of gear was established. The bending fatigue strength of gear teeth was calculated and analyzed by ANSYS/FE - SAFE software. The results show that carburizing gear bending fatigue limit from software simulation is larger than test result. There are optimum technic parameters for shot peening, and high intensity and coverage may be prejudicial to bending fatigue limit. Electropolishing after shot peening can further improve surface integrity to increase the bending fatigue strength of involute gear, but the strengthening effect is determined by the initial shot peening parameter.