【作者】 宋丽娟；

【导师】 梁延德；

【作者基本信息】 大连理工大学 ， 机械制造及其自动化， 2006， 硕士

【摘要】 弧面分度凸轮机构是一种精密分度机构,因其具有分度数大、分度精度高、定位可靠等优点,被广泛应用于各种自动机械中。相对于美国、日本等发达国家,我国研究弧面分度凸轮机构的时间较短,其产品还没有实现标准化和系列化,对于该机构的检测方法研究也不多。为此,本文以弧面分度凸轮的轮廓面方程为基础,建立了弧面分度凸轮的三维模型,提出了一种用三坐标测量机测量其轮廓面误差的方法。 本文对弧面分度凸轮机构进行了研究,根据凸轮旋向、转向、头数的不同,推导了各种类型的弧面分度凸轮的通用方程;以凸轮的通用方程为基础,给定一种类型凸轮的设计参数,用Matlab编程计算出凸轮工作轮廓曲面的点云坐标;使用Imageware软件,将点云拟合成曲面,依据给定的设计参数构造出基体曲面及点云曲面之间的连接面,用基体曲面边界裁剪点云拟合成的曲面,最终形成弧面分度凸轮的三维模型;用Pro/E完成了弧面分度凸轮与转盘的装配模型。根据弧面分度凸轮的实际应用情况,研究了其轮廓面的修正问题。 结合工程训练中心现有的三坐标测量机设备,仔细研究了三坐标测量机所能实现的测量功能,提出了一种用三坐标测量机测量弧面分度凸轮轮廓面误差的方法。利用Matlab的优化工具箱编制优化程序,确定测量起始点,使测量坐标系与理论坐标系重合;设计了一个数值实验,验证了优化程序的可靠性。从精度分析和实际操作的角度论证了这种测量方法的可行性和准确性。 分析了这种弧面分度凸轮测量方法的局限性,即该方法只适于对已知参数的弧面分度凸轮进行精度检验;如果要测量参数未知的凸轮,反求参数,这种方法是不适用的;针对该方法的局限性确定了下一步的研究方向。更多还原

【Abstract】 Roller gear cam mechanism is a type of indexing device. It is widely used in various automatic machines because of large indexing numbers, high indexing precision, reliable localization etc. Because our country studies this mechanism less than America and Japan, the standardization and seriation of the product aren’t researched, and the measuring method is studied deficiently. Therefore the author built a 3-D model based on the surface equations of roller gear cam, and presented a method of using coordinate measuring machine (CMM) to measure the surfaces of the cam.The roller gear cam mechanism is studied and the surface equations of various types of roller gear cam are acquired. The theoretic surface coordinates of roller gear cam are calculated with Matlab according to the surface equations and design parameters. The point cloud are converted into surfaces by using software Image ware; the surfaces of basal solid and connecting surfaces between point cloud surfaces are constructed according to design parameters; the point cloud surfaces are snipped with surface edges of basal solid and the model of roller gear cam is completed. The assembly model of roller gear cam mechanism is built by using Pro/E. The problem of how to correct the profiles of roller gear cam is studied.The function of CMM is studied according to the CMM that is owned by Engineering training center. A method of using CMM to measure surface error of roller gear cam is researched. The starting point is confirmed by programming with optimization toolbox of Matlab in order to adjust measuring reference frame to theoretical reference frame. A numerical experiment is designed and the validity of optimization program is proved. The truth of the measuring method is established by precision and feasibility analysis.The restriction of using this method to measure surfaces of roller gear cam is discussed, and the next research direction is confirmed.更多还原