Study on Gain Matching Based on Contour Error Sensitivity Function
The openness of existing computer numerical control systems is limited.And real-time contour error control strategies are difficult to integrate.For precision machining,it is necessary to work on off-line compensation methods for contour errors.In order to avoid secondary development of machining equipment,this paper proposes a method to reduce contour errors by matching the tracking error of each axis.Firstly,based on the construction of electromechanical hybrid control models for each feed system,the sensitivity function of contour error with respect to the reference trajectory is derived.Then based on the sensitivity function of contour error,the influence of servo parameters on the machining trajectory under different kinematic parameters is analyzed for the commonly used G01 line and G02/G03 arc commands in computer numerical control machining.Finally,by adjusting the control parameters of each servo axis and matching the dynamic error coefficient,the contour accuracy is improved.This method can reduce the errors caused by the dynamic characteristics of each axis without increasing the complexity of the control system.Meanwhile,this method has reference value for improving the contour accuracy of multi-axis synchronous machining.
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