摘要
研究多轴联动数控机床几何误差建模的问题。将运动轴的几何误差等效为微分运动,利用微分变换来描述各运动轴的微分运动对机床理想变换造成的误差,由此提出基于微分变换的几何误差建模方法。在分析机床运动链时,选择以工件坐标系为基准,使误差模型的基准与编程基准一致。用一条运动链完整表达运动轴的传动关系。最后进行了三轴联动测试轨迹的误差补偿试验,补偿后的轨迹精度得到了显著的提高,验证了误差模型正确性及有效性。
The geometric error modeling method for multi-axis CNC machines is studied.A modeling method based on differential transform method is proposed,when the geometric error of axis is equivalent to the differential movement based on its ideal position.The workpiece coordinate system is selected and machine kinematics chain is analyzed.which the error datum is coinciding with the program datum.Thus,only one kinematics chain is needed to describe the relation among the movement axis,and the error model can be merged into single formula.Finally,a compensation experiment is conducted on a CNC machining center,and experiment results show the validity and practicability of the proposed method.
出处
《工具技术》
2013年第8期66-69,共4页
Tool Engineering
基金
福建省科技厅重大专项资助项目(2010HZ0002-1)
关键词
数控机床
几何误差建模
运动链
微分变换
CNC machines
geometric error modeling
kinemics chain
differential transform
