精密机床床身结构三点支撑的多目标优化设计  

Multi-objective optimization of three-dotted supporting of precision machine tool bed structure

作　　者：云青[1] 牛文铁[1] 王俊强[1] 

机构地区：[1]天津大学机构理论与装备设计教育部重点实验室,天津300072

出　　处：《机械设计》2015年第7期1-7,共7页Journal of Machine Design

基　　金：国家科技重大专项基金资助项目(2012ZX04012-031);国家高技术研究发展计划(863计划)资助项目(2012AA040701)

摘　　要：三点支撑的高刚度床身结构对精密机床有着重要的影响,为提高机床的动静态特性,结合中心复合试验、响应面模型和多目标遗传算法,提出一种面向床身结构的三点支撑多目标优化设计方法,并以一精密卧式加工中心为实例进行验证。结果表明:通过有限次的数值模拟分析计算可获得设计空间内最优解,可使整机变形降低5.73%,整机首阶固有频率提高3.12%。优化后机床的动静刚度有所提高,验证了提出方法的正确性及可行性。The stiffness of three-dotted supporting is essential for precision machine tool. To improve the dynamic and static characters of machine tool,this paper provided a method of multi-objective optimization for the three-dotted supporting of bed structure by using central composite experiment,response surface model and genetic algorithm. Taking a precision horizontal machining center as an example,the proposed method was applicated and verified. The results showed that the optimal solution in design space could be obtained by finite numerical simulation calculation,the total deformation was reduced by 5.73%,and the first natural frequency was increased by 3.12%. The optimized dynamic and static stiffness of machine tool increased verifies the correctness and feasibility of the method. In conclusion,the improvement of the characters showed that the proposed method was simple and practicable.

关 键 词：三点支撑 多目标优化 有限元分析 

分 类 号：TH112[机械工程—机械设计及理论]