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| Structural Stiffness General Optimization Technology of Machine Tools Based on Modal Analysis |
| SUN Yewang 1,2 , CAO Ye 2 , SUN Songtao 3 , YANG Qiujuan 4 , YANG Luwei 1 |
1. Beijing Key Laboratory of Thermal Energy Technology of Technical Institute of Physics and Chemistry, CAS, Beijing 100190, China;
2. Beijing Institute of Technology, Beijing 100081, China;
3. PLA 32368, Beijing 100190, China;
4. Beijing BSD Science Development Co., Ltd., Beijing 100028, China |
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Abstract Aiming at the stiffness optimization key problems of machine tools, due to insufficient analysis of numerical iterative optimization algorithm and high cost of optimization machining test caused by complex structure and large size of machine tool, this paper provided the method of combining finite element modal analysis and experimental modal analysis to optimize the dynamic stiffness of machine tools including the vertical and gantry boring-milling CNC machine tools. Combined with the modal test analysis and FEM, the results show that without considering the stiffness and damping of moving pairs of machine tools, the simplified FEM modal analysis of the machine tool could better reveal the dynamic characteristics of the machine tool structure. According to the weak area of the dynamic stiffness of the structure, the low-order frequencies of the machine tools are increased by more than 10% and 40% respectively. Importantly, it is showed that the optimization analysis method could be applied to the analysis process of structural general optimization design.
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2022, 
