Structure Analysis And Incremental Optimization Design On Column Of High Precision Forming Gear Grinding Machine

With the rapid development of science technology and economy, the propertyrequirements of gear machining by gear processing has continue increased, and towardto the direction of high speed, high precision and high efficiency development, whichput forward higher requirements in designing and producing the machine tools. In orderto get a better fabrication procedure, reduce design cost and shorten the design period, itis necessary to analysis structural parts’ dynamics and static simulation of the machinetool during the early design stage, so that we can find the weak link, and then optimize.The column is one of the important supporting parts of the machine, the static anddynamic performance directly affects the work piece’s machining accuracy. With thecolumn of the YK7380NC numerical control mold gear grinding machine as theresearch object, the finite element analysis and optimization design method is adopted,aiming to improving the static and dynamic characteristics of column.In this paper, firstly a combined column is designed, and the three-dimensionalstructure model is established by using the solidworks software. Then using the ANSYSWorkbench to analysis the column’s static situation, and obtain its deformation, stressand strain, it is found that along the X direction of column, the deformation is larger, itsstatic rigidity is poor. Through the modal analysis, the former six natural frequency andvibration type of the column are got, it is found the whole dynamic stiffness of thecolumn is strong, the lowest natural frequency is75Hz, which is larger than theexcitation frequency of grinding tooth machine, so the column will not occur resonance.According to the worse static stiffness of the columns in the X direction, themethod of adding the counterweight is proposed to change the mechanical properties.in order to validate the method, a counterweight test for the column structure has beenmade, the result shows that this method is effective. In order to obtain the best effect ofcolumn counterweight, an optimized design to the column counterweight is presented,and the optimized parameters have been obtained. After that, according to the optimaldesign parameters the static and dynamic of the column structure have been analyzedafresh to get the column properties parameters after optimizing.By comparing the results of before with after optimizing the counterweight, thecolumn deformation along the X direction has been effectively reduced aftercounterweight, and the reduction range is up to40.4%. In addition, the columncomprehensive deformation, stress and strain also have been reduced. Meanwhile, thecolumn’s mode condition has changed, which is larger than the excitation excitingfrequency in the gear grinding machine, but this wouldn’t affect dynamicperformance when the column works. The research shows that the column has bettercomprehensive performance after optimizing counterweight.