关键词: 数控机床, 火焰切割, 误差建模, 误差补偿

Abstract: To improve the cutting accuracy of Computer Numerical Control (CNC) flame cutting machines,a novel real-time compensation method was proposed to modify the processing errors of machine tools on-line and enhance the processing quality of workpiece.Based on the flame cutting characteristics and transformation matrix method,the synthesized prediction models of processing errors were established,which could obtain the position and orientation deviations of workpiece under different cutting states in real-time.The dynamic compensation strategy for processing error was constructed,and the error compensation system based on input motion planning principle as well as the partial least squares compensation algorithm were developed respectively.Moreover,the physical implementation way for real-time compensation method was figures out.The simulation analysis on a self-designed CNC flame cutting machine and the comparison experiments with the teaching method were conducted,and the obtained results indicated that the proposed method had little disturbance with original cutting process,and the overall processing quality of the workpiece could be enhanced 40% approximately.The effectiveness and feasibility of the proposed method on improving the processing precision of CNC flame cutting machine were also proved.

Key words: NC machine tools, flame cutting, error modeling, error compensation