Parameter identification and optimization of slide guide joint of CNC machine tools

2017 International Conference on Material Engineering and Manufacturing

Zhou, S.^1 ; Sun, B.B.^1

Mechanical Engineering, Southeast University, Nanjing 211189, China^1

关键词: Dynamic parameters;    Dynamic performance;    Finite element simulations;    Harmonic response analysis;    Latin hypercube sampling;    Optimization variables;    Parametric finite elements;    Vertical stiffness;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/265/1/012025/pdf
DOI  :  10.1088/1757-899X/265/1/012025

来源: IOP

【 摘 要 】

The joint surface has an important influence on the performance of CNC machine tools. In order to identify the dynamic parameters of slide guide joint, the parametric finite element model of the joint is established and optimum design method is used based on the finite element simulation and modal test. Then the mode that has the most influence on the dynamics of slip joint is found through harmonic response analysis. Take the frequency of this mode as objective, the sensitivity analysis of the stiffness of each joint surface is carried out using Latin Hypercube Sampling and Monte Carlo Simulation. The result shows that the vertical stiffness of slip joint surface constituted by the bed and the slide plate has the most obvious influence on the structure. Therefore, this stiffness is taken as the optimization variable and the optimal value is obtained through studying the relationship between structural dynamic performance and stiffness. Take the stiffness values before and after optimization into the FEM of machine tool, and it is found that the dynamic performance of the machine tool is improved.