Optimization Design Of Beam Structure In TX1600G Complex Boring And Milling Machining Center

With the high development of machinery manufacturing industry,the precision requirements of various industries for machinery products are increasing day by day.As the foundation of manufacturing industry,numerically-controlled machine tool has become one of the key research objects for many experts and scholars.As one of the most important parts in the mechanical field,box parts,affect the products cost and quality directly by machining accuracy and efficiency.It is the key issue that to develop CNC machining center which meets the technical requirements of complex box classes must be solvedIn this paper,the TX1600G precision compound boring and milling machining center is taken as the research object.According to beam's actual load condition to solve and analyse how Beam deformation load is influenced by the Weight of beam,sliding table,spindle box and the milling force.After the study,we know the root cause of the beam deformation is Insufficient stiffness and the low natural frequency and finally we clear the goal of beam structure optimization.The beam was statically analyzed and modal analyzed by the Simulation module of SolidWorks finite element software.Deformation diagram of the beam and the first five natural frequencies are obtained under several typical milling conditions.Through the summary of the results,beam's maximum deformation,shape variables and modal orders which effect the stability of the beam structure are determined.Two goals for muti-objective optimization are clear in this paper.By comparing several common topological optimization methods,the variable density method is chosen as the method of beam muti-objective topology optimization.Interpolating through the SIMP interpolation model which is selected from two interpolation models to improve the clarity of the optimization results.According to Eclectic planning,to Integrate two single targets with minimum flexibility and first-order natural frequency after that The mathematical model of muti-objective topology optimization is obtained.Then determine the weight coefficient of each target by the efficiency coefficient method.Importing the mathematical model into the Optistruct module in HyperWorks for muti-objective topology optimization of the beam of the composite boring and milling center.By comparing the performance parameters of the optimized front and rear beam models,it is determined that the method can balance the two optimization objectives of improving the beam stiffness and increasing the first-order natural frequency and proved the feasibility of this method.Combining the requirements of casting process,casting alloy and casting design on the structural design of castings,Optimize the shape and size of the beam structure by changing the layout of the internal ribs of the beam and the thickness of the ribs.By comparing the structural performance before and after optimization,it is found that the quality of the final structure of the beam is reduced by 14.9%compared with the original structure,which saves the manufacturing cost of the beam.Moreover,the maximum deformation of the beam under dangerous conditions is reduced by 26.7%,which increases the rigidity of the structure and improves the kinematic performance of the milled parts mounted on the beam in the Y direction.In addition,the natural frequency of the first-order natural frequency of the final structure is increased by 12.3%compared with the original structure,which ensures the stability of the beam during processing,so that the beam can maximize the processing precision and structural stability of the beam under the premise of satisfying the processing technology.