STEP-NC是一个用来实现CAD/CAM与CNC系统间数据交换的接口标准,基于STEP-NC的CNC系统是未来数控技术发展方向之一,该系统不但具有直线和圆弧插补功能,而且还具有样条曲线插补功能。为此设计了一个统一的基于NURBS样条曲线插补的通用插补器,并开发了一种基于等弧长的插补技术和插补算法。最后通过仿真和实例加工验证了该算法的有效性和可靠性。

STEP-NC is a new interface standard for data exchanging and sharing between CAD/CAM and CNC,and the CNC based on STEP-NC will be the next generation of CNC controller,which not only holds linear and circular interpolation but also possesses the capability of spline interpolation.A universal NURBS(non-uniform rational B-spline) based interpolator was designed and the interpolation technique based on constant arc increment and interpolation algorithm were inverstigated arc increment.The validity and reliability of algorithm was tested by an instance simulation and machining.