摘要
床身刚度是影响高速机床加工精度的一个重要因素。针对床身刚度是否满足加工精度要求的问题,以双直线电机高速进给的铣床床身为研究对象,采用有限元方法建立床身的动力学模型,并利用有限元软件Hyperworks对床身进行动静态分析,找出该床身的动静态性能薄弱部位,利用Hyperworks的Optistruct拓扑模块对床身进行结构优化。优化后的结果表明,3个方向静刚度平均提高了1 000 N·μm^(-1),固有频率提高了约30 Hz,x和z向频率响应的振幅约减小50%,为同类型结构设计提供一定的参考。
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.
出处
《电子科技》
2016年第3期25-29,共5页
Electronic Science and Technology
关键词
床身
有限元方法
动静态分析
拓扑优化
machine tool bed
finite element method
dynamic and static analysis
topology optimization
