关键词: 机床床鞍, 灵敏度分析, 模态分析, 多目标优化

Abstract: To realize the multi-objective optimization design of tools key parts,the saddle of a high-speed precision CNC lathe was taken as the objective to investigate the effect of saddle structure parameters on dynamic characteristics with sensitivity analysis and experimental analysis.By taking the first two order natural frequency and the mass of saddle as optimal objectives,the guideways overhang length,guideways span and slider spacing as design variables,a multi-object optimization equation was established.The particle swarm optimization and the fuzzy comprehensive evaluation were used to solve the equation,and the best solution was obtained.Through the optimization,the first and second order natural frequencies of saddle were increased by about 33% and 4.13% respectively,and the mass was decreased by about 7.76%.The optimization result showed that the proposed method was feasible,and could provide the theoretical basis for saddle optimization design.

Key words: saddle, sensitivity analysis, modal analysis, multi-objective optimization