Dynamic Characteristic Analysis And Structural Parameter Optimization Of Propeller Milling-Grinding Compound Machine Tool

Propeller is an essential driving part of a ship,its precision will affect the whole ship's running.In order to obtain a better quality propeller,it is necessary to use the NC machine tool with better reliability,vibration resistance and stability to process the propeller.In this paper,the integrated propeller milling and grinding composite machine tool is studied.The propeller blade area is also large and the precision is high.In the actual production process,the deformation or vibration of the machine should be avoided as far as possible,therefore,based on the analysis results of static and dynamic characteristics of machine tools and the structure optimization technology,this paper designs a kind of machine tool structure with better comprehensive performance,which can improve the machining quality of machine tools,improve the production efficiency,and save production costs.This paper is based on the transverse project "Control system and Software Development of Integrated Propeller Milling and Grinding compound Machine tool",the virtual model of propeller machining machine tool is established in ADAMS,and the relative kinematics and dynamic analysis are carried out.Then,the static and dynamic characteristics of the machine tool are analyzed in ANSYS,and the structure optimization of the machine tool parts is carried out.The main tasks accomplished are as follows:Firstly,the structural characteristics of the propeller milling and grinding composite machine tool are analyzed,and a simplified virtual three-dimensional prototype is established in ADAMS by using virtual prototype technology,and the kinematic and dynamic performance of NC machine tool is obtained by simulating the actual motion process of the machine tool.Verify whether the machine tool will have motion interference and guide the model selection of the driving motor,and so on.Then combined with the finite element analysis theory and the actual working condition of machining propeller,the displacement and deformation cloud diagram of the machine tool and the stress cloud diagram of the whole machine are obtained by statics analysis of the machining machine tool with ANSYS Workbench software.The modal and harmonic response analysis of the machine tool is carried out in the software,and the main modes and corresponding vibration mode of the machine tool are obtained.The modal testing system is also established to verify the accuracy of the simulation analysis of the machine tool by the relevant modal experiment.Through these analysis results,it canprovide a reference for the identification of weak links in machine tools.Finally,the optimization module of ANSYS workbench is applied to optimize the structural parameters of grinding head rod,column and its base in the weak parts of the machine tool,and the machine tool structure with better performance is obtained,which improves the machining quality and reduces the weight of the machine tool.It also reduces the production and manufacturing cost of machine tools.