基于响应面法的龙门加工中心回转工作台结构优化设计

STRUCTURE OPTIMIZATION DESIGN FOR THE ROTARY WORKTABLE OF GANTRY MACHINING CENTER BASED ON RESPONSE SURFACE METHODOLOGY

以某龙门加工中心回转工作台为研究对象,采用有限元方法对其进行静动态特性分析和优化设计。为提高回转工作台刚度和减轻重量,对主要设计参数进行Box-Behnken试验设计。在试验设计的基础上,对设计参数进行灵敏度分析并建立响应面模型,采用多目标优化算法对响应面模型进行优化,结合生产工艺确定最佳优化方案。优化结果表明,采用上述方法对回转工作台进行优化后,其最大变形量减少了36.8%,第一阶固有频率提高了5.4%,重量减少了2.6%,为回转工作台的优化设计提供了一种新思路。

Taking the rotary worktable of a gantry machining center as the research object,the static and dynamic characteristics analysis and optimization design are carried out by using the finite element method. In order to increase the stiffness and reduce the weight of rotary worktable,the main design parameters are tested by Box-Behnken experiment design.Based on the design of experiment,sensitivity analysis is carried out for design parameters and the response surface model is established. Then,the multi-objective optimization algorithm is adopted to optimize the response surface model and combined with the production technique to determine the best optimization scheme. The results of optimization show that the maximum deformation is reduced by 36. 8%,the first natural frequency is increased by 5. 4% and the weight is decreased by 2. 6% by using above method to optimize the rotary worktable,which providing a new idea for the design and optimization of the rotary worktable.