Abstract:

Based on the working rules of right angular exact index cam, a method for designing and machining a cam which indexes without impact was proposed. The positions of cam and dial were analyzed accompanied with their angular position, angular velocity and angular acceleration. An algorithm for design of right angular exact index cam was given. The tool trace of NC machining was calculated, thus the NC machining and programming algorithm for 4-axis NC machine tool was presented. With NC machine tools, a right angular exact index cam was made. The experimentation shows the machining efficiency is improved obviously. The indexing accuracy, stability of the cam are improved obviously in practice use, And the experimentation indicates the algorithm for designing and machining a cam is effective and efficient.

Key words: index cam, cam design, NC machining, motion generation

摘要：

根据直角式精密分度凸轮的工作原理，提出了一种无冲击分度凸轮的设计和加工方法。分析了凸轮和转盘的位置、角速度、角加速度的变化规律，给出了直角式精密分度凸轮的设计算法，同时计算了数控加工的刀位轨迹，并给出了四坐标联动数控加工和编程方法。运用数控机床加工出了直角式精密分度凸轮，其加工效率明显提高。凸轮在实际安装运行后，分度的准确性和平稳性得到了明显的改善。实例验证了所提出的设计和加工算法的正确性和高效性。

关键词: 分度凸轮, 凸轮设计, 数控加工, 运动生成