数控机床定位误差全温度综合建模及实时补偿

Synthesis Modeling and Real-time Compensation of Position Errors at Full Temperature for Machine Tools

提出一种数控机床定位误差的全温度综合建模方法。通过测量获得加工中心定位误差,采用多项式拟合和纵向建模法建立了加工中心在不同温度状态下定位误差的综合预测模型。利用FANUC数控系统的外部原点偏移功能,对一台加工中心进行实时误差补偿实验验证。实验结果表明,应用此误差建模方法及补偿功能,在常温和温升状态下,加工中心在三个方向的定位误差与补偿前相比都下降90%左右,大幅提高了加工中心在变温状态下的定位精度。

A synthesis model of positioning error under full temperature for machine tools is presented. Through measuring the positioning error of machining center, a synthesis prediction model for positioning error at different temperatures is proposed based on polynomial fitting and longitudinal modeling. Real-time error compensation is carried out on a machining center by applying the external coordinate offset function of FANUC computer numerical control（CNC） system. The real-time compensation carried out on the machining center shows that application of this compensation method compensates positioning errors in three directions by almost 90% compared with no compensation. The accuracy of the machining center is improved effectively.