数控加工中心误差G代码补偿技术

Soft compensation technique of volumetric errors of CNC machine centers by modifying G codes

提出了数控加工中心误差的G代码补偿方法 .应用刚体运动学理论和齐次坐标变换技术建立了多轴数控加工中心空间误差的通用模型 ,把加工中心刀具相对工件的终端误差表示为各个误差源和刀具位置的函数 .给出了全部运动误差参数的激光干涉仪识别方法 .提出了数控加工中心三种基本运动的误差补偿算法 .在立式加工中心上进行了该方法的实验 ,结果表明引入误差补偿后使加工中心的系统误差减小 80 %～ 90 % .

This paper discusses the development of the general volumetric error model for multiaxis CNC machining centers by using rigid body kinematics and homogeneous coordinate transformation techniques. The final error between the tool and the part on a machine is expressed as functions of the tool location and its elemental errors. The laser interferometer measuring methods of the errors resulting from the relative motion between the machine's structural elements are given. Computational approaches to compensating errors of the basic motions of a machine are developed. The developed strategies are testes by a CNC machine, and the results show that 80?%～90?% reduction of systematic errors is gained after introducing compensation.