【作者】 王轶；

【导师】 郁鼎文；

【作者基本信息】 清华大学 ， 机械工程， 2011， 硕士

【摘要】 机械制造业是国家工业化的重要基础，为国民经济各部门提供所需装备，是国防安全的有力支撑和保障。机床工业作为机械制造业的基础，其先进程度直接决定着机械制造业的先进程度，要想机械系统工作性能及产品质量的关键就在于增进机床的动态性能。本论文以南通科技集团股份有限公司生产的VCL1100型立式加工中心为研究对象，研究分析如何优化机床结构从而改善其动态性能，提高产品质量。运用有限元理论和ANSYS软件，结合立式加工中心自身结构特点，研究了其有限元建模技术和方法，并结合实验结果，对立式加工中心的结构进行了优化设计。论文首先结合了对立式加工中心整机模态实验和振动实验的结果，初步判断了整机的薄弱环节，并取得了立式加工中心动态特性的实验数据。其次，结合Solidworks平台制作的三维实体模型，在ANSYS软件平台上建立了机床整机有限元模型，并利用弹簧阻尼单元模拟了结合面的特性。运用模态分析理论和ANSYS模态分析软件，对整机动态特性进行了仿真，结合实验数据，对仿真结果进行了验证。最后，论文基于有限元模型，针对VCL1100型立式加工中心的薄弱环节，主要对立柱和铣头箱进行了结构优化设计，并同过谐响应仿真对优化前后整机的动态性能做出了比较，验证了结构优化的结果。更多还原

【Abstract】 The mechanical manufacturing industry is the crucial foundation of nationalindustrialization. It provides essential equipments for all economical divisions, whichmakes it a powerful prop and guarantee of national defense security. The industry ofmachine tool is the basis of mechanical manufacturing, and its level determines thelatter one’s. In order to improve the performances of mechanical systems and productqualities, the critical part is to scale the machine tool dynamic performances.This thesis uses VCL1100vertical machining center, which is manufactured byTONTEC ltd., as the research object, and the research covers study and analysis ofhow to optimize machine tool structures to improve its dynamic performances, thus toimprove product quality. In this thesis, the techniques and methodologies ofestablishing the machine tool Finite Element model are studied combined with themachining center’s own properties, employing the Finite Element theories and thesoftware ANSYS; the structures of the machining center are also optimized accordingto the experimental results.The thesis firstly assesses the weak parts of the whole vertical machining center usingthe combined results of both modal experiments and vibrates experiments, andobtains the experimental results of the dynamic properties of the machine; then, thethesis establishes the Finite Element simulation model of the whole machine inANSYS combined with its3D models completed in the platform of Solidworks, withthe spring damp unit to simulate the interface properties. It simulates the wholemachine dynamic properties using modal analysis theories and ANSYS modalanalytical division, and verifies the simulation results with experimental ones; in theend, aiming at the weak part of the machining center, the thesis carries out structureoptimizing design on column and spindle box based on the Finite Element theories,and compares the dynamic properties before and after optimization through harmonicresponse simulations, by this way it verifies the results of the optimization.更多还原