【摘要】 为了减小刀具运动轨迹与工件几何曲线的误差,提出将传统的位置控制改为物理运动规律控制,即建立数控机床的运动模型,分析被加工轮廓的曲线方程、加工工艺运动要求与刀具加工运动的合成或分解关系,推导出轨迹运动方程组(即运动规律)。提出了基于运动规律控制的轨迹实现方法,推导出相应的公式,提出了范数误差公式。根据轨迹运动方程组编制了仿真程序,用计算机仿真不同规律的轨迹运动,用图形直观地表示运动参数变化和轨迹的运动过程,以分析轨迹的几何精度。实验和仿真证明了该方法是可行的、高效率的动态控制方法。更多还原

【Abstract】 In order to reduce geometric errors between motion trajectory and work piece curve,this paper present a means of controlling trajectory motion law to replace traditional position control.The motion physical model of CNC machine tool was set up for studying the relation among profile curve geometric functions,machining motion composition,machining process requiremens and tool motion.The motion trajectory equations of all parameters were built,which described the internal regularity of trajectory motion.According that the locus motions with various laws were simulated by computer.The changes of parameters were shown by graphical plot visualized and the theory was tested.The results of observation and analysis of the motion process and geometric precision demonstrate that this method is a practicable and accurate dynamic control method.更多还原