CNC Machine Tool Servo Parameters Analysis And Adjustment Method For S-shaped Specimen

Supported by the National S&T Major Project,considering the demands of aviation enterprises and the machine tool industry,in order to improve the 5-axis NC machine tools’ machining accuracy,NC machine tools’ servo parameters analysis and adjustment method for S-shaped specimen is studied aimed at the NC machine tools’ servo precision caused by servo parameters.The main achievements of this paper are presented as follows:1)A method of extracting servo contouring error based on the contrast experiment is studied.The influence of servo parameters on machining error is analyzed and the contrast experiment is designed to eliminate the geometric error,thermal error and the error due to cutting force.Then the servo contouring error is extracted.2)A servo system contouring error prediction model for five axis NC machine tool is established.Based on modern control theory,the relationship between the servo system parameters and the axis servo system tracking error is analyzed.Based on vector analysis method,the contouring error prediction model for five axis NC machine tool position servo system is studied.Specific to the characteristics of complex surface contour error,the conversion from the contouring error of tool position servo system to the surface contouring error of is implemented.Then the servo system contouring error prediction model for five axis NC machine tool is established.3)A method to adjust servo parameters for S-shaped specimen is proposed.The universality of S-shaped specimen as the research object is analyzed with respect to aircraft structural parts,then the optimization model to adjust servo parameters for S-shaped specimen is established.In consideration of the characteristics of the NC machine tool servo parameters,the genetic algorithm is designed to solve the optimized servo parameters.4)Based on the research above,a servo parameter adjustment system of NC machine tool for S-shaped specimen has been developed.The experimental verification has been carried out and the results indicate that the optimized servo parameters can effectively improve the servo performance of NC machine tools and improve the machining accuracy of five axis NC machine tools.