螺旋伞齿轮精锻工艺及其数值模拟的研究.pdf

摘要 I 论文题目:螺旋伞齿轮精锻工艺及数值模拟研究专业:材料加工工程研究生:皇涛指导教师:陈拂晓教授摘要螺旋伞齿轮的承载能力和传动平稳性能大大优于直齿伞齿轮,能很好地满足高速重载传动要求,其显著的性能也促使研究人员对其设计与加工技术进行深入研究。随着直齿伞齿轮的精锻技术的成熟及推广应用,螺旋伞齿轮的精密成形加工日益受到人们的重视。传统的齿轮加工方式,既破坏了金属纤维流线组织,降低了齿轮的齿根弯曲疲劳强度、齿面耐磨性等,同时生产效率低,材料利用率低,生产成本高。以精密锻造取代现行的铣削加工是实现螺旋伞齿轮近净成形的重要方法之一。本文研究了从动螺旋伞齿轮的精锻工艺并对其精锻过程进行了数值模拟分析。首先对齿轮钢 20CrMnTi 进行等温压缩试验,分析了该钢的热压缩变形规律,探讨了变形速率、变形温度对其压缩流变应力及组织的影响,建立了该钢的变形抗力模型。其次利用 UG 三维软件对从动螺旋伞齿轮模具结构和坯料进行建模,借助 DEFORM 模拟软件对精锻成形工艺过程进行了三维刚塑性有限元模拟,分析了其成形过程和齿形变形规律、应力分布、应变分布及力能参数等。从不同摩擦系数、不同成形温度、不同坯料尺寸等影响因素分析齿形充填情况。同时对从动螺旋伞齿轮精锻成形进行了物理模拟试验,分析了齿形充填金属流动规律,并验证了从动螺旋伞齿轮精锻成形的可行性和数值模拟的正确性。最后根据数值模拟和物理试验结果对从动螺旋伞齿轮精锻成形参数进行了优化,并在工程实际中进行生产试验,检验了优化结果的正确性。关键词: 螺旋伞齿轮,精锻成形,数值模拟,齿轮钢论文类型: 应用基础研究 Abstract II Subject: Research Status and Numerica l Simulation of Precision Forging Process for Spiral Bevel Gear Specialty: Materials Processing Engineering Name: Huang Tao Supervisor: Chen Fu-xiao Professor ABSTRACT The load-carrying capacity and smooth transmission performance of spiral bevel gear are much better than that of straight bevel gear, it can meet the requirements of high-speed heavy transmission very well. Its significant performance also prompts researchers to study its design and processi ng technology in depth. With the maturity of precision forging technology for straight -tooth bevel gear and its wide promotion and application in the world, people pay more and more attention to the precision molding of spiral bevel gear. The traditi onal gear processing method damages the metal fiber flow anization, reduces th e bending and fatigue strength of the root of gear tooth, and tooth surface abrasion etc. It also results in low productivity, low material utilization, and high production co sts as well. Therefor e, precision forging replacing the existing milling process is one of the most important means to achieve precision sha