基于进给优化的五轴机床高精度加工研究

Research on High Precision Manufacturing of 5-Axis Machine Tool Based on Feed Optimization

介绍五轴机床最佳进给率和高性能精密控制算法加工方式,并进行实验验证。通过引入进给率调度算法,以最大限度地减少五轴弯曲刀具路径的循环加工时间。在寻找沿刀具路径的最佳进给时,考虑了五轴驱动器的速度、加速度和加加速度限制,以确保伺服驱动器以最小的跟踪误差平稳和线性运行。为设计一个精确的轮廓控制器,开发分析模型来估计五轴加工实时过程中的轮廓误差,通过考虑刀尖与参考路径的法向偏差和刀轴方向与参考方向轨迹的法向偏差来定义两种类型的轮廓误差。

The optimal feed rate and high precision control algorithm processing method for 5-axis machine tool were introduced and verified by experiments.5-axis feed rate scheduling algorithm was introduced to minimize tool bending time.The speed,acceleration and jerk limits of the 5-axis drive were considered when searching for the optimal feed along the tool path,to ensure that the servo driver ran smoothly and linearly with minimum tracking error.In order to design an accurate contour controller,an analysis model was developed to estimate the contour error in the real-time process of 5-axis machining.Two types of contour errors were defined by considering the normal deviation between the tool tip and the reference path and the normal deviation between the tool axis direction and the reference direction trajectory.