X-C直驱平台平面曲线轮廓磨削廓形误差非线性耦合控制

Plane curve parts grinding contour error nonlinear coupling control for X-Cdirect-drive platform

为提高X-C平台的曲线轮廓加工精度,引入了双轴联动耦合控制思想。根据切点跟踪加工原理,提出X,C轴跟踪误差耦合形成廓形误差的计算模型,在此基础上设计了X-C直驱加工耦合控制系统。为削弱曲线轮廓X-C磨削过程中轮廓轨迹、加工速度变化、磨削力变化、控制参数等因素对轮廓精度的影响,研究非线性PID调节的控制策略来补偿控制X,C轴跟踪误差引起的廓形误差。建立了直线电机与力矩电机构成的X-C直驱加工平台仿真模型,并以凸轮加工为例进行非线性交叉耦合廓形误差补偿控制仿真实验。结果表明:与常规加工相比,所设计的非线性交叉耦合控制器能够在一定程度上提高X-C直驱平台曲线轮廓的加工精度。

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 de- signed. 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 estab- lished 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.