关键词: X-C直驱平台, 平面曲线轮廓, 廓形误差, 非线性耦合控制

Abstract: To improve the X-C direct-drive platform curve machining contour accuracy,the coupling control system of double axis was introduced.Based on X-C tangential point linkage grinding principle,the calculation model for X,C axis tracking error coupling form contour error was proposed,and X-C direct drive coupling control system was designed.To weaken the influence of factors such as contour trajectory,processing speed change,load change and two-axis control parameters on curve contour accuracy in process of curve contour X-C grinding,the nonlinear PID control strategy was designed to compensate the contour error.The X-C direct-drive platform simulation model was established based on linear motor and torque motor.By choosing the cam processing as the example,the simulation results showed that the nonlinear coupling controller could improve the machining contour accuracy of X-C direct-drive platform.

Key words: X-C direct-drive platform, non-circular surface parts, contour error, nonlinear coupling control