高速立式加工中心床身结构分析及优化

Structure analysis and optimization of high-speed machining center lathe bed

针对立式加工中心的复合筋床身结构,利用Workbench对其静动态性能进行了分析,得到了床身各个方向的变形量,以及前六阶的固有频率,并进行了振型描述,对其做了拓扑优化设计.依据拓扑优化结果,提出了增加两个出砂孔和增大床身底部筋格面积等两个改进方法.对改进后的床身结构进行了静动态分析,通过图表对比可知,改进后的床身结构在静动态性能上都有一定的提升.最后,对改进的床身进行了谐响应分析,绘制出频率-振幅曲线图,在该曲线图谱中显示的谐响应分析结果与模态振型相吻合.

Aiming at the composite reinforcement machining tool bed of the machine center,make the static and dynamic analysis by Workbench,get the deformation in all directions,the six order natural frequency,and the description of the vibration type.According to the topology optimization results,increase two sand holes and the grid area at the bottom of bed.Take the static and dynamic analysis of the improved structure,through the chart comparison,the static and dynamic performance has some promotion.Harmonic response is carried out for the optimized model to draw the chart of frequency-amplitude.The chart showed harmonic response′s result coincided with mode shape.