（毕业设计论文）《Pro／ENGINEER的凸轮机构》.doc

摘要 机械设计中，尤其是在零件的三维造型和运动彷真方面，计算机辅助设计(CAD)技术已经成为重要的设计工具。PRO/E是CAD/CAM/CAE领域的一种优秀软件，其强大的参数化造型、产品装配和运动仿真与分析等功能已经广泛应用于工业产品设计。 应用PRO/E的图形曲线特征和关系式工具，可准确、快速 的生成凸轮实体,根据凸轮机构从动件的运动规律，确定凸轮机构从动件的运动方程式。通过对具体凸轮机构设计案例分析。提出了利用Pro／ENGINEER软件中图形基准与可变截面扫描功能相结合进行凸轮轮廓精确造型的一种比较快捷的方法，对凸轮机构的精确及优化设计有一定的启示。轮机构的压力角是凸轮机构设计的一个重要参数，决定了凸轮大小和机构强度等诸元素，同时压力角又受其它设计参数的影响。设计时应以减小凸轮机构压力角为目的，从平面凸轮机构结构型式、基本尺寸、从动件运动规律曲线等设计参量对压力角的影响入手进行分析，运用数值计算和分析类比的方法，得出在合理设计凸轮参数的情况下减小凸轮机构压力角的相应措施。 应用PRO/E的运动仿真功能，通过对机构进行运动学仿真和运动结果的分析，提高机构设计的准确性，对装配仿真的原理做了深入细致的分析，包括装配模型的建立、装配序列规划、装配路径规划、装配过程中的干涉检查、零件库的建立与应用。 关键词: PRO/E；凸轮机构；三维造型；装配；运动仿真。 Abstract In mechanical design．CAD technique already become all knportant tool for design．especially the three dimensional modeling and motion simulation．Pro/E is a kind of excellent software in CAD／CAM／CAE field．Its technical of full parametric product design function can be used for three dimensional modeling design and it also includes assembling and motion simulation analysis function etc．． Using the graph curve attribute and the relation tool of Pro/E software，the cam entity can be produced precisely and quickly． This essay introduces how to decide the driven part motion equation of the cam mechanism according to the motion regularity of driven parts of the cam mechanism．With a certain cam mechanism analysis．using PRO/E’s graphics datum line and its scanning function of changeable cross sections．the author here puts forward an easy and quick way to make the exact profile of cam．This way is enlightening for the exact design and optimization of cam mechanism．The pressure angel of the cam mechanism is an important parameter in design which determines the cam size and mechanism strength．In addition，the pressure angel is also affected by other designing parameters．Aim at reducing the pressure angle of the com mechanism，the paper analyzed from the impacts of the structure style of the flat cam mechanism，basic size of the cam，and friction status On the pressure angle through numeric calculati