Research On Vibration Characteristics And Topology Optimization Of The Vertical Processing Center Headstock

Processing center as the foundation of mechanical products is thecarrier of advanced manufacturing technology and the basic mean ofproduction of the equipment industry. It directly affects the level ofautomation and the construction of national defense. As the High-endCNC machine tools, the dynamic performance (vibration, noise, stability,etc.) is the most important performance indicator. For the processingcenter system, its performance will directly influence the accuracy ofmachining centers, so the research on machine tool vibration controllinghas the important practical significance for the mechanical industry. Theheadstock is the key component of vertical machining center, its staticand dynamic performance and vibration resistance will directly determinethe performance quality of the machining center.This paper analyzes of the static and dynamic characteristic andoptimization of the vertical machining headstock. Relative optimalheadstock was designed by the research of this subject, which not onlyensures that static characteristics of the headstock, but also improves itsdynamic characteristics. This paper provides technical support for thesimilar design and research in the future.First, it gives the static analysis, modal analysis and harmoniousresponse analysis for the headstock of the original structure. Then thepaper gets their static deformation, the natural frequencies and the modeshapes. The result shows that the anti-vibration performance isinsufficient, and it cannot meet the needs of the structure design.Second, the paper leads the honeycomb material into the design ofthe headstock. The cellular material has not only good specific strengthand specific stiffness, but also a good anti-vibration and electromagnetic shielding. We use the Solidworks3D modeling software to establish thehoneycomb structure of the headstock model, and finish finite elementanalysis in the ANSYS Workbench software. The steps include settingmaterial, determining the boundary conditions, loads, and solving theresults. The paper carries out static analysis, modal analysis and harmonicresponse analysis on the honeycomb structure headstock. It also contraststhe honeycomb structure headstock to the original structure headstock. Itshow that honeycomb structure headstock is better that the originalstructure headstock.Third, the honeycomb structure of the headstock has been optimized.First analyzes the topology optimization of the honeycomb structureheadstock. According to the results, we put forward a new type ofheadstock structure. After the optimization, the headstock staticperformance was kept, but the dynamic performance was improvedsignificantly. Through the research on this subject, we can improve theanti-vibration performance of the headstock and obtain the most optimumdesign of the headstock.The final part of this paper describes the process of static stiffnesstest on machining center. And it also designs a test scheme and makes awell analysis on the test results. Because of the simplification onmachining center model in computer analysis and some experiment error,it will produce some differences in the two kinds of results. But the totallaws of stiffness changing are the same in the results.