摘要
针对传统机床横梁设计中存在材料利用效率低、刚度不足和设计周期较长的问题,以某型号龙门加工中心横梁结构为研究对象,基于拓扑优化和筋板形式选择对横梁进行轻量化设计。首先对加工中心整机进行静力学分析、模态分析和谐响应分析,分析结果表明横梁为影响加工中心性能的关键零部件。然后以横梁为优化目标,对横梁进行拓扑优化,根据拓扑优化的材料分布情况设计了横梁的最优基本结构形式,通过对比选择静、动态性能较好的‘X’类型筋板进行布局,得到了最终的横梁优化结构。最后对优化的横梁结构进行验证,分析结果表明:该结构设计方法有效地改善了整机的动态性能,在横梁质量减轻2.1%的同时,优化后的整机的静刚度和前6阶固有频率均得到了不同程度的提高。
Aiming at the problems of low material utilization efficiency,insufficient rigidity and long design cycle in the design of traditional machine tool beams,the beam structure of a certain type of gantry machining center is taken as the research object,and the beams are lightweighted based on topology optimization and ribbed plate selection.Firstly,the static analysis,modal analysis and harmonious response analysis of the machining center are performed.The analysis results show that the beam is a key component that affects the performance of the machining center.Then take the crossbeam as the optimization target,perform topological optimization on the crossbeam,design the optimal basic structural form of the crossbeam according to the material distribution of the topological optimization,and then select the X-type rib plate with better static and dynamic performance for comparison.The final optimized structure of the beam.Finally,the optimized beam structure is verified.The analysis results show that the structural design method effectively improves the dynamic performance of the whole machine.While the beam quality is reduced by 2.1%,the static stiffness and the first six natural frequencies of the optimized machine are reduced,All have been improved to varying degrees.
作者
胡世军
顾海鹏
HU Shi-jun;GU Hai-peng(School of Mechanicai and Electecal Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《组合机床与自动化加工技术》
北大核心
2020年第11期139-143,共5页
Modular Machine Tool & Automatic Manufacturing Technique
关键词
横梁
有限元分析
拓扑优化
轻量化
beam
finite element analysis
topology optimization
lightweight
