关键词: 床身, 有限元方法, 动静态分析, 拓扑优化

Abstract:

Machine tool bed stiffness is an important factor in the machining accuracy of high speed machine tools.The finite element method is adopted to establish the dynamics model of lathe bed basing on double linear motor of high speed feed milling machine lathe bed,then the Hyperworks is used for dynamic and static analysis of bed to find out the dynamic and static performance of the machine bed weak positions,and finally the Hyperworks Optistruct module is employed for topology optimization of the bed structure.The optimized results show an average increase of 1 000 N·μm-1 in static stiffness in three directions and ~ 30 Hz in inherent frequency,and a decrease in frequency response by ~ 50% in the x and z directions.

Key words: machine tool bed;finite element method;dynamic and static analysis;topology optimization