某型数控车床床身的模态分析与结构优化

Modal Analysis and Optimization of the Bed Structure of a CNC Machine Tool

利用ANSYS有限元分析软件,以某型机床床身为研究对象,建立床身的简化有限元模型,以固有频率作为衡量床身动态性能优劣的指标,通过模型在不同参数下的前六阶固有频率及振型进行对比分析,重点研究了不同床身高度时床身固有频率的变化趋势,以及主轴箱支撑台筋板不同布置方式对床身动态特性的影响,并对此提出有效的解决方案.结果表明,优化后的机床床身具有良好的动态性能,进而能够提高机床加工精度的保持性和可靠性.

The simplified finite element model of the machine tool bed was established with ANSYS and the natural frequency was detected as the index of the dynamic performance.Based on the simulation analysis,the first 6-order natural frequency and vibration modes were comparatively analyzed,during which the effect of the bed height on the its natural frequency was studied.The impact of the arrangement mode of ribbed plate of the spindle box supporting platform on the bed dynamic properties was also investigated and some effective solutions were proposed.It indicates that an optimized machine tool has better dynamic performance,which can offer higher workpiece quality and process stability.