Research On The Static Accuracy Analysis Of Five-axis Coordinate Advance Milling And Drilling Machine Tools

Numerical control machine is the manufacturing master of the industrial field,its precision is an important index of the national automation level.Therefore,the analysis of the precision characteristics of the CNC machine tool has certain theoretical research value and engineering application value.Five-axis drilling and milling machine tool are the objects of study in this article,and there are also some studies of the Precision characteristics.Article’s main contents and achievements are as follows:First of all,it gives an explanation about the basic structure and motion principle of the five-axis drilling and milling machine.The multi-body system theory and homogeneous coordinate transformation are used to establish the static accuracy model of the machine tool.After that,using MATLAB to establish the most value solving model under the constraint of geometric tolerance,and then the maximum variation range of machining errors can be obtained.Secondly,it gives an explanation about the various error factors of the machine tool and the related classifications and definitions.The sample points of the static precision model of the machine tool are extracted by using the interpolation sampling technique,and the linear response surface model is established.,it calculates and analyses the influence of the above algorithm on the geometric accuracy of the machine tool through the iterative algorithm design.The results of calculation show that the errors parallelism and verticality errors of the five-axis machine tool have a great influence on the machining accuracy of the machine tool.Thirdly,on the basis of the static precision model of the machine tool,the equivalent elastic mechanism motion model of the machine tool is established,the corresponding elastic coordinate system is established on each motion unit,and the equivalent elastic accuracy model of the machine tool is established by using homogeneous coordinate transformation.The error analysis method is used to identify the key elastic errors of the machine tool.Through the normalization,the influence of the stiffness of each moving member on the stiffness of the machine is obtained.The analysis results show that the stiffness of the machine column has the greatest influence,followed by X-direction slide and Y-direction slide.Combined with the finite element analysis and design method,the stiffness characteristics of the column are analyzed to get the key features that have a great influence on the stiffness of the column.After that,the influence of each dimension parameter on the mass,the deformation and the rigid ratio is analyzed and calculated Optimization variables for reference,the use of Solidworks internal optimization algorithm iteration,the structural parameters of the column was optimized.Afterwards,according to the specific working conditions,the structure of machine X slide and Y slide has been improved.Finally,taking the machine tool spindle box as the research object of tolerance modeling and analysis,the tolerance datum coordinate system is established in the spindle box of the machine tool.By using the spin method and the homogeneous coordinate transformation method,the tolerances of the spindle box are respectively Mathematical modeling.The relationship between the spin quantity and axis deviation of the actual geometrical elements is established,and the variation range of the axis deviation of the spindle head of the machine tool is obtained by the most value method.