卧式加工中心床身蜂窝状支撑结构设计与优化

Design and Performance of Honeycomb Support Structure for Machining Center Bed

提出采用蜂窝状支撑结构对卧式加工中心床身进行性能优化的思路,即将床身原有支撑结构改为蜂窝状结构,并对各性能指标与原结构进行比较,分析优化效果。利用参数化建模方法,分析蜂窝状结构胞单元参数、排布方式、排布密度与床身一阶固有频率、质量、静变形、等效应力之间的关系,得到蜂窝状结构对床身最佳优化效果。利用响应面法建立参考数学模型设计改进方案,用灰色关联法对计算结果处理分析,并采用熵权法改进灰色关联法,使得其成为一种适于床身优化方案选择的评价标准。以我国西北某机床厂生产的某型卧式加工中心床身优化为例。选择蜂窝胞单元边长与筋板厚度为设计变量,利用ANSYS Workbench进行参数化设计,采用MATLAB软件进行数据处理和灰色关联法分析选出最佳优化方案。结果表明,优化后的机床床身各性能指标得到大幅度地提升。床身一阶固有频率提高约24. 1%,床身质量减轻约7. 4%,静变形降低约26%,等效应力减小约35. 1%。

The idea of honeycomb support structure performance optimization of horizontal machining center bed was proposed,and lathe bed was the original support structure changed into a honeycomb structure,and the performance index of the original structure and parallel comparison,analysis of the optimization effect.By using the parametric modeling method,analysis of honeycomb structure of unit cell parameters,density and frequency of the bed,the quality of the static deformation,equivalent stress relationship,the effect of honeycomb structure on the bed could be obtained.The improved design reference model using response surface method,analysis of the calculation results with the gray correlation method,and uses the improved entropy and gray correlation method,a comprehensive optimization evaluation standard for bed was made.In a machine tool factory in northwest of China,the production of type horizontal machining center as an example of optimization,parametric designed by ANSYS Workbench by selecting sides of cellular texture and thickness of rib board as design variables,the best optimization scheme of data processing and the gray correlation method with MATLAB software were analyzed and selected.The results show that the performance indexes of optimized machine tool has been greatly improved.The first-order natural frequency is increased by about 24.1%,the bed mass is reduced by about 7.4%,the static deformation is reduced by about 26%,and the equivalent stress is reduced by about 35.1%.