Dynamic And Static Characteristic Analysis And Optimal Design Of Structure For GT650 Gear Milling Machine

In this paper, it has been introduced that the methods of structural optimization design and the development status of machine tool structure optimization at home and abroad. Base on the method of structure design and optimization, the structure optimization of GT650 spiral bevel gear milling machine has been studied, and the dynamic and static characteristics of whole machine and parts has been analyzed. Research work includes the following contents:(1)A simplified 3D model and assembly is established, and then its dynamic and static characteristics are calculated by combing the load and restriction during machining in practice.(2)After the unit structures of various types of machines are compared, the unit structure of the better dynamic characteristics is selected base on the stiffness as appraisal criteria. It has been taken the method of the variable analysis to consider the influence of some parameters of unit structure towards fundamental frequency. By using the best unit structure, the minimum unit structure of the machine tool parts and the structure components has been optimized. According to the theory of unit structure, the carriage, slipway and column structure has been optimized.(3)The bed section is optimized through the sectional topology method by tensile and transverse rib distribution, thus a new internal frame of bed is formed. The parameterized model was imported into ANSYS Workbench to parameterize finite element model. Then the multi-objective optimization method is used to optimize the parameters of the external and internal dimensions of ribs size of the bed structure. The total deformation, natural frequencies are regarded as the optimization goal to generate a response reference point. Then the optimal design point is selected on the design requirements. By this way, the structure of the machine bed has been optimized.(4)The whole machine is reassembled after the optimization of its important parts and its dynamic and static characteristics are analyzed. Then compared with the original machine, the data show that the dynamic and static characteristics have been improved, which emphasizes the importance of the parts optimization to the whole machine optimization.