内螺纹加工的有限元数值模拟分析毕设说明书.doc

e 题 目 内螺纹加工的有限元数值模拟分析 学生姓名 ee 学号 e 所在学院 机械工程学院 专业班级 e 指导教师 e 完成地点 e 2009 年 06 月 03 日  内螺纹加工的有限元数值模拟分析 e （e） 指导老师：e [摘要]内螺纹冷挤压因其成形的螺纹精度高、表面完整性好，且保持冷挤压之后内螺纹表面及次表面的冷作硬化状态，提高了螺纹的连接强度及其抗疲劳寿命，因此在当今高速、大负载、动载条件下的航空、航天和高速列车等领域有着巨大的应用前景。内螺纹冷挤压技术经过多年试验研究己取得了一定的进展，然而其数值模拟技术方面的研究仍较医乏，还需加强内螺纹冷挤压数值模拟方面的研究.本文建立了成形过程三维几何模型，并利用刚塑性有限元软件DEFORM-3D进行了内螺纹冷挤压成形过程的数值模拟，分析获得了工件底孔直径的大小，挤压速度及振动频率对螺纹成形过程的影响规律，从而为深入理解内螺纹冷挤压成形过程，同时也为内螺纹冷挤压工艺提供新的研究手段。 [关键词]内螺纹 冷挤压 挤压丝锥 挤压扭矩 有限元分析  Finite Element Analysis of internal Thread Processing E e Tutor：e Abstract:Process of internal thread formed by cold extrusion has a great prospect in the thread processing on aircraft landing gear, high-speed train and many other applications working on high speed and dynamic load conditions because of its excellent forming accuracy, surface integrity and the improvement of thread connection strength and fatigue life, which maintain the cold hardening state on the thread surface after cold extrusion.Technology of internal thread formed by cold extrusion has been developed after years of study, however, it still lacks of numerical simulation on it and needs to be strengthened urgently. In this paper, the mathematical model of extrusion torque during the forming process is build,the rigid plastic finite element software DEFORM-3D is used for the numerical simulation on the process of internal thread formed by cold extrusion, and study on the influence law of Internal thread forming process include workpiece diameter, extrusion speed and the frequency by using numerical simulationand , and provide a new r