关键词: 铣刀刀尖点, 频响函数预测, 响应耦合子结构分析法, 遗传算法, 实验模态测试

Abstract: Based on receptance coupling substructure analysis method,a Frequency Response Function (FRF) prediction model of milling tool tip was established.Aiming at the difficulty in obtaining FRF matrix of spindle-tool holder base system through theoretical calculation and experimental approach,a FRF matrix optimal fitting method of tool holder base was proposed based on the combination of experimental modal test and genetic algorithm.By taking the spindle system of a vertical machining center VMC850E as the research object,a predicted FRF of the milling tool tip was performed with the proposed method.Compared with the measured FRF of the tool point,and the result showed that the predicted FRF curve fitted well with the measured FRF curve within the frequency range of 0-4000Hz,and the relative error of natural frequency was under 4.37%.

Key words: milling tool tip point, frequency response function prediction, receptance coupling substructure analysis, genetic algorithms, experimental modal test