六轴联动数控机床的联动模式切换

Linkage modes switch for a six-axis linkage CNC machine tool

为了优化六轴联动数控机床的刀具中心点运动轨迹误差,提出了利用联动模式切换实现该误差最小的方法。建立了六轴联动数控机床的运动学模型,研究机床的冗余联动特点,并定义了冗余旋转联动轴。根据冗余联动特点,研究了满足不同刀具运动要求的联动模式和联动轴形式。建立了刀具中心点运动轨迹误差模型,提出了利用联动模式和联动轴形式切换优化该误差的方法。在实际机床上进行加工实验,通过联动模式的切换实现了刀具中心点轨迹误差的优化。

The trajectory error of the tool center point in a six-axis computer numerical control(CNC)machine tool was minimized by switching the multiple linkage modes.A kinematic model of the six-axis linkage CNC machine tool was used to analyze the redundant linkages and redundant rotational linkages of the machine tool.The redundant linkage characteristics were then used to identify the linkage modes and linkage axes that provided the desired tool motion.A trajectory error model for the tool center point was used to switch the linkage modes and linkage axes to minimize the error.Tests on a CNC machine tool show that the model accurately predicts how to switch the linkage modes to minimize the tool center point trajectory error.