【摘要】 研究了精密卧式加工中心"框中框"结构中关键结构件滑板的拓扑优化方法,提出了一种新的拓扑优化设计思路。首先在满足装配边界条件下最大限度地放开初始优化模型的设计区域,实现滑板的外轮廓拓扑优化;基于外轮廓结构设计得到二次拓扑优化模型,在约束外轮廓的基础上实现了滑板内部筋板的拓扑优化,最终得到一种新的滑板结构设计方案。在设计中以滑板结构多工况加权静态应变能最小,1阶固有频率最大为目标函数,以体积比为约束条件进行拓扑优化设计。采用新结构的滑板的静刚度在X,Y,Z三个方向均得到了提高,1阶固有频率提高了15.7%,质量减轻了6.5%,提出的优化方法对机床大件的拓扑优化具有重要的指导意义。更多还原

【Abstract】 The topology optimization method for the slide board that was the key structure in the ′box-in-box′ structure of the precise horizontal machining center has been studied. A new design method of topology optimization was put forward in this paper. First, the design region of initial model was released with maximum extent in the condition of assembly boundary conditions. The quadratic topology optimization model was obtained based on the outline model. The topology optimization of inner rid plate of the slide board was realized under the outline constraint. Finally, a new slide board structure was provided. The topology optimization of the slide board was carried out under the volume constraint with minimizing the strain energy on multiple load cases and maximizing the first nature frequency as the objectives. The static stiffness of the new slide board was improved in three directions of X, Y, Z. The first natural frequency was improved by 15.7% and the weight was reduced by 6.5%. It indicated that the above method had important significance to the topology optimization for the key structures in machining tools.更多还原