Characteristic Analysis And Optimization Of The Gantry Structure Of Numerical Control Gantry Boring And Milling Machine

In the medium and large parts of the mechanical process,numerical control gantry boring and milling machine plays a very important role. With the improvement of product accuracy requirement,the requirement of the NC machine tool comprehensive performance also improves.Because the traditional design method lacks effective theory basis, it restricts the machine tool to high speed, high precision and efficiency development direction.So it is particularly important to introduce modern design theory during the design of the machine tool.During the design of the machine tool, the static and dynamic machine characteristic parameters were obtained by means of the machine tool parts static and dynamic analysis.These parameters and the performance requirements of machine tools are compared and analyzed,then the weakness of the machine tool can be found, which can provide guidance for the designer, shorten the devplopment cycle of the products,reduce the cost and improve the comprehensive performance of products.This study as a certain type of gantry structure of numerical control gantry boring and milling machine for the research object, the beginning of machine tools design for the machining accuracy is insufficient and the structural deformation is too large. The structure characteristics of beam and column were analysed and optimized by using the finite element software.The tinite element model of numerical control gantry boring and milling machine was set up by using the finite element software. Then the force of interface can be extracted,which can accurately reflect the force condition in the assembly of the body parts and provide accurate boundary conditions for subsequent analyses.By the static analysis of beam and column,the stress, strain and deformable distribution were obtained.Then the results can be used for optimum design,which can confirm the objective function and part of the constraint condition. By the modal analysis of beam and column, the first six order natural frequency and mode of vibration were obtained. Then the results can be used for optimum design,which can confirm the constraint condition.Response curves of the main design parameters versus max deformation and mass were obtained.Thus can clear view the influence effects of the main design parameters versus max deformation and mass,which can provide guidance for structure design.This has the important practical meaning and reference value.On the basis of the comprehensive evaluation of the machine parts performance indicators, the finite element software and optimization design theory combined. Mathematical optimization model was established,which cantains the internal steel plate and wall thickness as optimization design variables, the greatest stress and first natural frequency as state variables and the maximum deformation structure as the objective function.Then it can be used NLPQL algorithm for the optimization.Finally qualified design variables were obtained.