基于有限元法的锻压机床床身结构优化设计

Structural optimization design for forging machine bed based on finite element method

为了提高锻压机床床身的综合力学性能,首先设计了3种不同筋板布置方式的机床床身,在CAD/CAE集成模拟设计平台下对它们进行有限元分析,根据分析结果优选出最佳的床身设计方案。然后对优选出的床身采用CAD/CAE优化设计技术,以床身的筋板厚度和壁厚作为设计变量,以床身的质量作为主要优化目标、一阶固有频率和最大变形作为次要优化目标进行多目标优化设计,求解得到床身的最优结构尺寸,使床身质量下降6.12%,同时静刚度和抗振性也符合设计要求。最后通过静态和模态试验验证了优化设计方案的有效性。

To improve the combination mechanical properties of forging machine bed,three machine tool beds with different web-plate layout were designed firstly,and the finite element analysis for beds was conducted in the CAD / CAE of integrated simulation platform.The best bed design plan was selected according to the analysis results.With the main optimization objective of bed＇s mass and the secondary optimization objective of first-stage inherent frequency as well as the maximum deformation,by taking the wall thickness and web-plate thickness of forging machine bed as design variables,the multi-objective optimization design was carried out on the basis of CAD / CAE optimization design technology.The optimal structure dimensions of machine tool bed were obtained after calculation,which decrease the mass of bed by 6.12%.Meanwhile,the static stiffness and vibration resistance also meet the design requirements.Finally,static and modal tests verified the validity of the optimization design.