| High-speed machining technology is widely used in the automotive industry,mold manufacturing and electronics manufacturing industries due to its unique advantages.The clamping performance of the high-speed chuck directly affects the high-speed machining reliability and processing quality of the product.Based on the previous research results,this paper uses theoretical analysis,finite element analysis,numerical analysis and reliability analysis to model high-speed spring chuck,analyze contact characteristics,optimize structural parameter,analyze reliability and study cutting stability.And achieved the following results:Firstly,based on the theory of elastic mechanics,the mechanical model of high-speed spring chuck is established.At the same time,the finite element contact model of high-speed spring chuck and tool is established by finite element analysis software ANSYS Workbench.Comparing the clamping torque calculated by the two models to the clamping torque of the tool,it is found that the relative error can be controlled within 6%,and the correctness of the finite element model is theoretically verified.Secondly,the finite element model is used to analyze the stress distribution characteristics on the contact surface of the chuck/tool.The variation of the average contact stress of the contact surface under different structural parameters was studied,and it was found that increasing the number of leaf springs can effectively alleviate the stress concentration in the contact area.At the same time,based on the model,the influence of the working state of different machine tools on the average contact stress of the chuck/tool is revealed.It is found that the average contact stress begins to decrease sharply when the rotational speed is greater than 30,000 rpm,which provides a basis for ensuring the reliability of high-speed machining.Thirdly,aiming at improving the average contact stress of the chuck/tool,the orthogonal simulation test is used to optimize the structural parameters of thehigh-speed spring chuck,and the optimal parameter level combination of the chuck structure parameters is obtained.Based on the simulation results,the numerical fitting function was established by using MATLAB software,and the mapping relationship between different structural parameters and the average contact stress of the chuck/tool was established.At the same time,the optimized chuck parameter size is determined by solving the fitting function.The average contact stress of the chuck/tool is improved by 14.62% before and after optimization,which lays a foundation for the development of a new high-speed spring chuck with better performance.Finally,based on the reliability analysis technology of ANSYS Workbench,the Six sigma reliability analysis module is used to analyze the clamping reliability and structural strength reliability of the optimized chuck and then obtained the maximum chuck under the Six sigma reliability design requirements.The clamping torque is1357.108 mN ? and the minimum safety factor for the chuck is 3.1986.Through the experiment,the cutting stability analysis of the optimized high-speed spring chuck tool system at different spindle speeds was carried out,and it was found that the optimized chuck cutting performance performed well. |
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