NURBS interpolator with pre-compensation based on discrete inverse transfer function for CNC high-precision machining

In the field of computerized numerical control (CNC) machining, high-speed and high-precision machining has been regarded as key research by many scholars. conventional methods, are contradictory. It is inevitable to reduce feedrate improve processing accuracy. paper, a pre-compensation based on discrete inverse transfer function (PDIT) theory proposed. PDIT able contour accuracy without decreasing feedrate. The proposed divided into three parts: NURBS interpolator, scheduling, interpolator with pre-compensation. great advantage directly interpolating parametric curve. Therefore, paper adopts accomplish interpolation. S-type flexible acceleration deceleration used for path planning, maximum starting obtained under constraint. pre-compensation, pre-compensated PDIT. For input, response reaches steady-state within periods time. Before response, unsteady-state exists in function. usually sustains dozens interpolation periods, which inevitably lead error machining. Hence, employed compensate caused interpolator. drive system function, so can also cause errors before response. Finally, performance evaluated simulations experiments. experimental results illustrate that obviously