基于数据采样的弧面凸轮自适应直接插补算法

针对目前弧面凸轮加工存在拟合精度与数据传输之间的矛盾,以及线性拟合破坏轮廓表面光顺性等问题,提出了一种基于数据采样的弧面凸轮自适应直接插补算法。该算法既能保证加工过程大部分时间内进给速度的恒定,而且能在曲率变化大的地方对进给速度进行自适应调整,以保证弓高误差不超出最大允许值。同时定义了相应的弧面凸轮自适应直接插补指令格式。最后基于UG开发了弧面凸轮自适应直接插补实体仿真系统,通过插补仿真实例进一步验证了该插补算法的正确性。该方法有效弥补了目前弧面凸轮线性拟合加工的缺陷,不仅能提高弧面凸轮加工过程中系统的稳定性和表面加工质量,而且使弧面分度凸轮机构定位精度和使用寿命提高,从而促进其推广和应用。

Adaptive Direct Interpolation for Globoidal Cams Based on Data Sampling

Aiming at the conflict between fitting precision and quantities of data communication during the machining process of globoidal cams,and the unfairness of contour surface resulting from the linear fitting,we propose an adaptive-feedrate interpolation for globoidal cams based on data sampling,which can not only assure a constant feedrate during machining,but also adjust the feedrate automatically when a curvature is varied greatly.An adaptive direct interpolation G-code format is also defined to machine globoidal cams,and an adaptive-feedrate interpolation simulation system is built based on UG.Simulation examples based on the developed system have further proved the correctness of the proposed adaptive-feedrate interpolation for globoidal cams.The proposed algorithm can effectively overcome the shortcomings of the traditional machining method based on linear fitting.It can not only improve the system stability and the surface quality during the machining process,but also achieve the higher positioning accuracy and longer operating life of the globoidal cam mechanisms.