Structural Analysis And Optimization Of High Precision Horizontal Boring Lathe Headstock

Horizontal Boring lathe headstock is a component used to connect the tool and transfer energy,it is one of the most critical components of the machine.Structure of headstock is closely related to the overall performance of the machine tool,directly affects machining accuracy and stability of the machine.Under external loads,unreasonable headstock structure can easily occur structural deformation,affecting precision,even have serious security problems.Headstock design flaws make the material utilization unreasonable,resulting in a waste of resources,seriously hampered the development of China's high-precision machine tools.The source of this thesis is key technologies collaboration research of the high precision super heavy CNC horizontal boring lathe(Project No.:2012DFR70840),based on this research,for the problem of headstock structural analysis and optimization conducted the following research:To study headstock structural deformation distribution characteristics,using 3D modeling software to build a three-dimensional solid model of the headstock;aim to simplify the calculation,make the existing headstock structure model simplification;through stress analysis of the structure of the headstock,clearly boundary conditions suffered on headstock structure,and then analyze the static mechanical properties of the headstock structure,proposed structural factors that affect the strength and stiffness of the headstock.To further understand the structural working state of the headstock,especially in dynamic characteristics,based on modal theory mathematical model using the finite element method to do headstock modal analysis,headstock dynamic characteristics changes mainly by the impact of lower modes,respectively computing the first 6 natural frequencies and mode shapes of the headstock;on the basis of the headstock modal analysis,clearly to know the weaknesses structure of the headstock,provides an effective basis for the headstock structure optimization design.To complete the headstock static and dynamic characteristics,ensuring machining accuracy is not affected,while ensuring the strength stiffness to meet the needs of the premise,using the selection optimize methods,in order to achieve a uniform distribution of headstock stress,reduce headstock distortion,enhanced weaknesses structure of head stock and improve headstock low natural frequency,determine the need to improve the structural parameters,make the headstock structure optimization analysis.To verify the results of the headstock structure optimization is right or not,using modal testing methods,determine the hammering method trigger,single-point excitation multi-point response experiment program,collecting test signal,import receiving device to analysis the data,extracting modal parameters can be identified and verified optimization results.