Research On Five-axis Cutting Parameter Optimization Adjustment Method Based On Complex Surface Partitionin

With the rapid development of science and technology,five-axis CNC machine tools are widely used in aerospace,automotive and marine,medical equipment,optical equipment and precision molds and other complex curved parts processing and manufacturing fields.Therefore,the geometric model of complex surface parts becomes more and more complex.Most traditional machining methods use fixed cutting parameters to calculate and generate five-axis machining toolpaths.Due to the changing shape of the complex surface,the cutting state of the 5-axis machining tool cutting system also changes frequently.If fixed cutting parameters are used to generate the 5-axis machining toolpaths,the best cutting conditions will not be obtained in some parts and the generated toolpaths will be less adaptable.In this paper,the surface quality of complex surfaces is improved to some extent by partitioning the complex surfaces and optimizing the cutting parameters for different machining parts of the workpiece in response to the change of the cutting state during the cutting process.(1)First,we establish a mathematical calculation model for complex curves and complex surfaces,analyze them according to the concept of surface processing complexity and surface geometric characteristics,discretize them,and propose a surface partitioning method that reflects the real-time cutting and processing state based on the type-value point information generated by the discrete mesh.This method is based on the curvature feature partitioning criterion,which can divide the discrete typevalued points of the surface and achieve the accurate partitioning of complex surfaces.(2)In order to more accurately represent the real-time cutting machining state,the cutting force,an important physical quantity,needs to be analyzed with emphasis.Based on the five-axis cutting mechanism of complex surfaces,the equivalent plane orientation is determined by analyzing the model’s bevel cutting geometry relationship in a coordinate transformation.According to the requirements of the complex surface machining characteristics,the geometric mathematical model of the annular tool is analyzed and applied to the calculation of the integral cutting force of the annular tool,considering that because chip generation will have an impact on the tool deformation and machining errors,the chip thickness during cutting is also calculated.Through the derivation,a theoretical basis is provided for establishing the coupling relationship between cutting force and cutting parameters,and it is proved that cutting parameters have a certain influence relationship on cutting force.(3)The mathematical model of five-axis cutting parameter optimization is established,and the optimization function and its constraints are obtained by analyzing each factor affecting the cutting quality accuracy in the cutting process.In this paper,the Newton-Raphson algorithm is used to optimize the mathematical model,and MATLAB is used to implement the optimization process of this cutting process,integrating the complex surface partitioning method and the cutting parameter optimization algorithm,and constraining the optimization objective function to obtain the best solution set.VERICUT simulation is used to demonstrate the effectiveness of the proposed method,and the optimization results are analyzed and verified.