基于自抗扰控制的变速非圆车削技术研究

为了抑制非圆截面工件加工时的颤振,将变速加工应用于非圆截面车削中,设计了变速车削系统结构,分析了变速车削抑制颤振、提高稳定性的机理,设计了适于变速非圆车削的直线伺服单元,单元控制采用自抗扰控制技术.车床控制系统采用PMAC(Programmable multi-axis controller)时基控制法,实现刀具驱动进给和工件变速旋转的协调控制,完成非圆截面的变速车削.结果表明,直线伺服单元能很好地跟踪刀具目标值,非圆截面车削加工精度和稳定性得到了提高.

Research on the technology of variable spindle speed noncircular turning based on active disturbance rejection control

To suppress the chatter of noncircular manufacture process,this paper applies variable spindle speed turning to noncircular turning process.The framework of variable spindle speed system is designed.The mechanism of chatter suppression and stability improvement using variable turning system is analyzed.The linear servo unit available for variable speed noncircular turning process is designed.An active disturbance rejection control technique is applied to servo unit.The tool feeding and the workpiece rotation synchronize by using time-base method of PMAC(programmable multi-axis controller) and achieve the variable speed noncircular turning.The research results show that the linear servo unit is able to track the desired trajectory of cutting tool motion.The machining precision and stability are improved.