Research On Identification And Optimization Of Sensitive Servo Parameters For Slow Tool Servo Turning

As a novel ultra-precision machining technology,slow-tool servo turning is widely used in the machining of various complex free-form surfaces.At present,foreign countries have taken the lead in realizing industrialization in this field.Although domestic progress has been rapid,there are still big differences compared with industrial powers such as the United States and Britain.This paper focuses on the influence mechanism of the servo system on the contour accuracy of the complex free-form surface,and proposes the modeling method and control strategy of the permanent magnet synchronous motor for the key moving parts of the slowtool servo turning,and realizes the identification of the sensitive servo parameters of the servo system and improves it Targeting the accuracy of specific curved surface contours,a method for adjusting and optimizing sensitive servo parameters is designed.The specific research content includes the following:(1)Permanent magnet synchronous motor system model establishment and highprecision control strategy design.Analyzed the electromechanical system and interference environment of the permanent magnet synchronous motor,the key moving part of the slow tool servo turning,established a comprehensive description model of the permanent magnet synchronous motor system,proposed a method for identifying key parameters of the model,and completed the parameter self-tuning control strategy of the servo system design.(2)Identification of sensitive servo parameters of the servo system.Based on the completion of the servo excitation signal design,the Sobol global sensitivity analysis method is introduced,and the influence of single-axis servo parameters on the sensitivity of following error and the influence of multi-axis servo parameters on the sensitivity of contour error are comprehensively determined.Sensitive servo parameters for contour accuracy.(3)The establishment of a comprehensive model of slow tool servo turning and accuracy analysis.On the servo system model,the creation principle of slow tool servo turning is studied,including processing path planning,curve interpolation,surface shape prediction,surface accuracy analysis and other data processing algorithms and technologies that are connected to each other,and the slow tool servo turning is built.Comprehensive model with accuracy analysis.(4)Adjustment and optimization of sensitive servo parameters for specific curved surfaces.Combining the analysis results of sensitive servo parameters and the comprehensive model of slow tool servo turning and accuracy analysis,the optimization goal is to minimize the maximum surface profile error,and a variety of genetic algorithms are used to achieve the optimal combination of sensitive servo parameters for specific surfaces.Based on the Power UMAC multi-axis experimental platform,the performance verification of the servo control strategy and the optimization verification of the simulation processing based on complex free-form surfaces have been completed.The research results provide theoretical support for the improvement of the contour accuracy of the slow-tool servo turning.