弧面凸轮机构精度理论研究与精度检测

发布时间：2018-04-05 06:00

本文选题：弧面凸轮　切入点：精度分析　出处：《湘潭大学》2012年硕士论文

【摘要】：弧面凸轮机构由于具有分度精度高、运动平稳等许多优良的特性，在数控换刀机械手、自动生产线等方面有大量的应用。但是由于其结构比较复杂,到目前为止，，其误差控制与精度检测问题一直是制约其广泛应用的一个重要因素。本文研究了弧面凸轮加工误差与廓面误差的关系，以及各构件几何误差对运动精度的影响，探讨了弧面凸轮机构各构件公差的分配方法，采用三坐标测量机测量了弧面凸轮的几何形状误差，通过数据处理得到其特征线误差。设计开发了一套用于检测弧面凸轮运动精度的检测系统，为较好的解决弧面凸轮机构误差分配与精度测量问题提供了思路。本论文主要完成的工作如下：本文归纳分析了弧面凸轮的加工误差，并基于各加工误差因素建立了含误差的弧面凸轮曲面方程。基于含加工误差的弧面凸轮曲面方程，采用微分法研究了各加工因素对弧面凸轮廓面误差的影响，为根据弧面凸轮廓面误差分析加工工艺原因提供了理论指导。根据弧面凸轮机构各构件存在的几何误差，推导出了弧面凸轮机构中各零部件误差因素对弧面凸轮运动精度的影响系数，并分析了各结构因素与各影响系数的关系。为研究弧面凸轮机构公差分配问题奠定了基础。分析探讨了关于弧面凸轮机构各构件几何精度的分配问题，采用经验分配法和优化方法对弧面凸轮机构各零件几何特征公差分配问题进行了研究，对最佳极限公差法提出了改进方案。采用三坐标测量机测量了弧面凸轮的轮廓度，并通过数据处理得到了弧面凸轮特征线的误差值，结合精度分析的有关内容，推导了廓面误差对运动精度的影响。基于虚拟仪器技术设计了一套用于弧面凸轮机构运动精度检测的实验装置，完成了实验台硬件的设计与三维建模，完成了传感器等元器件选型以及软件的设计与调试工作。对弧面凸轮运动精度检测有一定的价值。
[Abstract]:The globoidal cam mechanism has a lot of applications in CNC tool changing manipulator and automatic production line because of its many excellent characteristics such as high indexing precision and steady movement.However, due to its complex structure, its error control and precision detection have been an important factor restricting its wide application.In this paper, the relationship between machining error and profile error of globoidal cam is studied, and the effect of geometric error of each component on motion accuracy is studied. The method of distributing tolerance of each component of globoidal cam mechanism is discussed.The geometric error of globoidal cam is measured by CMM, and the error of characteristic line is obtained by data processing.A set of measuring system is designed and developed to detect the motion accuracy of globoidal cam, which provides a way to solve the problem of error distribution and precision measurement of globoidal cam mechanism.The main work of this thesis is as follows:In this paper, the machining error of globoidal cam is summarized and analyzed, and the curved surface equation of globoidal cam with error is established based on the factors of machining error.Based on the curved surface equation of globoidal cam with machining error, the influence of machining factors on the error of globoidal cam profile is studied by differential method, which provides a theoretical guide for analyzing the machining process according to the error of globoidal cam profile.According to the geometric error of each component of globoidal cam mechanism, the influence coefficient of each component error factor of globoidal cam mechanism on the motion accuracy of globoidal cam mechanism is deduced, and the relationship between each structure factor and each influence coefficient is analyzed.It lays a foundation for the study of tolerance distribution of globoidal cam mechanism.In this paper, the problem of geometric accuracy distribution of globoidal cam mechanism is analyzed and discussed. The problem of geometric tolerance distribution of globoidal cam mechanism is studied by means of empirical distribution method and optimization method.An improved scheme is proposed for the optimal limit tolerance method.The contour of globoidal cam is measured by CMM, and the error of characteristic line of globoidal cam is obtained by data processing. The influence of profile error on motion accuracy is deduced by combining with the content of precision analysis.Based on the virtual instrument technology, a set of experimental equipment is designed for measuring the motion accuracy of globoidal cam mechanism. The hardware design and 3D modeling of the experimental platform are completed, and the selection of sensor and other components as well as the design and debugging of software are completed.It has certain value for measuring the motion accuracy of globoidal cam.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH112.2

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