FANUC-Oi数控机床伺服系统振动抑制优化研究

Research on optimization of vibration abatement of FANUC-Oi CNC machine's servo system

FANUC-Oi数控机床在金属工件切削加工中,其伺服系统出现的振动严重影响数控机床工件加工的精度和表面粗糙度。这些振动主要有低频振动、中频振动、高频振动、全闭环控制振动、停止振动等。经理论分析,这些振动可通过在控制系统中增加滤波器、PI控制环节、减振增益控制环节、加速度反馈控制等进行抑制优化。为此,给出了振动抑制优化方法的系统结构、参数设置方法。经大量实验数据表明,该方法能显著改善工件加工精度和表面粗糙度。

The vibration of servo system happened when FANUC-Oi cuts metal parts seriously affects the accuracy and surface finishment of the parts machined.These vibrations mainly include low-frequency vibration,middle-frequency vibration,high-frequency vibration,vibrations in the close-loop control system,vibrations in the CNC machine stopped,etc.By theoretical analysis,these vibrations can be abated and optimized by adding filters to the controlling system,PI controlling unit,reduced gain in the control unit,accelerate negative feedback unit,etc.System structure and parameter setting method of the optimization of vibration abatement are given in this paper.A lot of experimental database shows that the optimization of vibration abatement can significantly improve the accuracy and surface finishment of the parts machined.