Structure Improvement And Optimization Of Gantry Milling System For Compound Boring And Milling Machining Center

With the development of The Times,the processing quality requirements of mechanical products are getting higher and higher.The box parts are one of the important parts of mechanical products.In order to meet the strict and high precision machining quality and technical requirements of box parts,the research and development of complex boring and milling machining center with higher machining accuracy is imminent.In this paper,the structure of gantry milling system of TX-1600 G complex boring and milling machining center is the object of study.According to the actual external load of gantry milling system structure,the force analysis is carried out,and the root cause of the gantry milling system structure deformation is summarized.Firstly,according to the motion stroke of milling parts on the gantry milling system,the position of several classical working conditions is determined,and the static analysis and modal analysis of the gantry milling system structure under each working condition are carried out in the finite element analysis.Thus the most dangerous condition of gantry milling system structure is determined.In this paper,several topology optimization methods of continuum structure are briefly introduced.The variable density method of SIMP interpolation is used to optimize the structure of gantry milling system of complex boring and milling machining center.Then the paper focuses on the current solutions to the multi-objective optimization problem and determines to use the compromise programming method and the efficiency coefficient method to solve the multi-objective topology optimization problem in this paper.According to the optimization results and casting process,the structure of gantry milling system was re-modeled,and the performance parameters of the new and old models were compared.The mass of the new structure is 15% less than that of the old one;The maximum shape variable of gantry milling system structure in the most dangerous working condition is reduced by 25%;,the first natural frequency is increased by 30%.By optimizing the dynamic and static characteristics of gantry milling system,the machining accuracy of the complex boring and milling machining center can be improved.At the same time,the feasibility of the multi-objective optimization problem solving method is proved.