FANUC系统中实时前瞻的NURBS插补研究与实现

摘要

在加工NURBS曲线时,为克服直线插补和圆弧插补的不足,可利用FANUC系统自身的NURBS插补功能实现NURBS曲线加工。为保证NURBS曲线的高速高精加工,利用伺服HRV2控制功能与CNC的实时前瞻控制相结合,通过调整预读前馈系数和速度增益参数方法改善机床的加工性能。实际刀具运动轨迹表明,该方案可改善伺服系统的响应和刚性,减少机床的加工误差并提高定位速度。%To overcome the shortcomings of line interpolation and circular interpolation,we utilize the NURBS interpolation function of the FANUC system to carry out the machining of NURBS curve.In order to ensure the high-speed and high-accuracy machining of the NURBS curve,we combine the control function of the HRV2 servo system with the real-time look-ahead control function of CNC and improve the machining performance of the CNC by adjusting the look-ahead feedforward coefficient and the velocity gain parameters.The actual tool movement trajectories show that our new scheme can improve the response and rigidity of the servo system,reduce the machining errors of the CNC and increase its location velocity.