减速器齿轮疲劳强度分析.docxVIP

河南科技学院新科学院2017届本科毕业论文（设计）减速器齿轮的疲劳强度分析学生姓名： 董志文所在系别： 机械工程系所学专业：机械设计制造及其自动化导师姓名： 宁欣完成时间： 2017年5月10日摘 要随着汽车工业与交通运输的发展，汽车更新换代的速度不断加快。对于报废汽车而言，一方面是社会与环境的沉重负担，另一方面又是极具经济价值的“资源”。报废汽车不仅可以进行材料回收和零部件再制造，部分零部件甚至可以直接重复利用。但目前还缺乏对服役零件进行再制造的评判依据，其中零件剩余寿命是衡量零件再制造的主要依据之一。论文先从疲劳寿命预测基本方法和流程出发，介绍了目前惯用的四种疲劳寿命计算方法，即名义应力法、局部应力应变法、应力场强法和裂纹扩展寿命法。并对其进行了对比分析，最终选择适合本文的研究方法名义应力法。接着文中重点介绍了减速器齿轮疲劳寿命预测过程，包括减速器齿轮三维模型的建立，有限元模型的建立，其工作载荷谱的提取及齿轮轴材料S-N曲线的得出。最后在专业疲劳分析软件MSC.Fatigue中计算出该齿轮轴的疲劳寿命。最后引用了一个算例验证了该方法的准确性和可行性。关键词：齿轮轴；疲劳寿命；三维模型ABSTRACTWith the development of automobile industry and transportation, the speed of automobile replacement is accelerating. For scrap cars, on the one hand, it is a heavy burden of society and environment, on the other hand, it is a resource with great economic value. Scrap cars can not only carry out material recycling and parts remanufacturing, and some parts can even be reused directly. However, there is still a lack of evaluation criteria for remanufacturing of service parts, in which spare life of parts is one of the main criteria to measure parts remanufacturing.The paper starts from the basic fatigue life prediction method and process, introduces the calculating method of four kinds of fatigue life is currently used, i.e. the nominal stress method, local stress-strain, stress field and crack propagation life method. And make a comparative analysis of them, and finally select the research method which is suitable for this paper, the nominal stress method. Then this paper focuses on the prediction of fatigue life of gear deceleration process, including the establishment of three-dimensional model of gear reducer, finite element model, the extraction and the load spectrum of gear shaft material S-N curve. Finally, the fatigue life of the gear shaft is calculated in the professional fatigue analysis software MSC.Fatigue. Finally, a numerical example is given to verify the accuracy and feasibility of the proposed method.Keywords: gear shaft; fatigue life; 3D