内平动分度凸轮机构的设计理论及实验研究

发布时间：2018-08-06 11:48

【摘要】：随着科学技术的进步和发展,使得种类繁多的自动、半自动机械在各个领域得到了十分广泛的应用。其中,机械产品研究领域的一个热点研究,就是间歇机构。该机构可以根据生产工艺的需要,完成预定的不连续的工艺操作。间歇机构将连续的输入运动转换为具有某种运动规律的时动时歇的周期性的输出运动。现代工业向着高速化、重载荷和高精度的方向发展,这也就对间歇机构结构设计和运动性能提出了更高的要求。目前,常用的分度凸轮机构分为平行分度凸轮机构、弧面分度凸轮机构与圆柱分度凸轮机构三种基本类型。并且根据需求,将这些机构组合改进,研究出各种变异机构。本文应用组合机构的创新设计理论,基于内平动齿轮的传动原理,提出了内平动分度凸轮机构。该机构分度数大、结构紧凑,可以在高速工况下运转。论文首先根据该机构的传动方式,对机构的传动原理、结构组成进行深入的研究,提出机构可实现大分度数、高速的最优机构设计方案。接着依据已知的设计参数研究了凸轮廓线形成原理,并结合输出件针轮的运动规律,建立凸轮—针轮运动矢量关系坐标系,完成了对分度凸轮廓线方程的推导。第二,利用Matlab软件,对凸轮的重要几何特性进行了分析计算。主要包括如下内容：初步生成凸轮的理论廓线；分析凸轮廓线的曲率半径,得到凸轮的实际廓线；推导出凸轮各段廓线的压力角与时间的函数关系；对针齿在啮合点处作用力的力臂进行分析,根据力矩平衡方程计算出所有针齿所受的啮合力。最后,本文对内平动分度凸轮机构的实验样机进行研制。
[Abstract]:With the progress and development of science and technology, semi-automatic machinery has been widely used in various fields. One of the hotspots in the field of mechanical product research is the intermittent mechanism. According to the requirements of the production process, the organization can complete the scheduled discontinuous process operation. The intermittent mechanism converts the continuous input motion into the periodic output motion with a certain motion law. Modern industry is developing towards the direction of high speed, heavy load and high precision, which puts forward higher requirements for the structure design and motion performance of intermittent mechanism. At present, the commonly used indexing cam mechanism is divided into three basic types: parallel indexing cam mechanism, globoidal indexing cam mechanism and cylindrical indexing cam mechanism. And according to the demand, the combination of these institutions will be improved to develop a variety of variation mechanisms. In this paper, based on the driving principle of internal translational gear, an internal translational indexing cam mechanism is proposed based on the innovative design theory of the combined mechanism. The structure of the mechanism is large, compact, and can be operated at high speed. Firstly, according to the transmission mode of the mechanism, the transmission principle and the structure composition of the mechanism are studied deeply, and the optimal design scheme of the mechanism with large degrees and high speed is put forward. Then according to the known design parameters, the principle of cam contour formation is studied, and the motion vector coordinate system of cam-needle wheel is established in combination with the motion law of the pin wheel of the output part, and the equation of indexing cam contour is deduced. Secondly, the important geometric characteristics of cam are analyzed and calculated by Matlab software. The main contents are as follows: the theoretical profile of cam is generated preliminarily, the curvature radius of cam contour is analyzed, the actual profile of cam is obtained, and the function of pressure angle and time of cam profile is deduced. The force arm of the force acting on the needle tooth at the engagement point is analyzed and the engagement force of all the needle teeth is calculated according to the moment balance equation. Finally, the experimental prototype of internal translational indexing cam mechanism is developed.
【学位授予单位】：天津科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH112.2

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