关键词: 高速加工, 三次均匀B样条, 插补, 实时控制, 加速度控制, 预读速度规划, 计算机数控系统

Abstract: To meet the requirements of the high-speed and high-precision machining of complicated curves, a feedrate planning and interpolation algorithm for the cubic uniform B-spline curve based on the look-ahead function was studied. In this algorithm, an overlapping combination method was proposed to realize the smooth connection between adjacent B-spline segments. The formula for calculating the maximum machining velocity was also presented to guarantee the machining precision and to dynamically respond to the system. The idea of planning unit was introduced, based on which the feedrate planning and interpolation process was divided into four parallel threads：the B-spline interpolation, the partition of planning units, the feedrate planning, and the planning unit interpolation. By running these parallel threads, the high-speed real-time demand in the cubic uniform B-spline curve interpolation was satisfied. Finally, the validity of the algorithm was proved in the GT100 Computer Numerical Control (CNC) system.

Key words: high speed machining, cubic uniform B-spline, interpolation, real-time control, acceleration control, look-ahead feedrate planning, computer numerical control system