曲轴端面加工中心立柱的动态特性分析  

Dynamic analysis of the column of crankshaft face machining

作　　者：项秉乐 常新山 秦宝荣[1] 张冬冬[1] 

机构地区：[1]浙江工业大学浙江省特种装备制造与先进加工技术重点实验室,浙江杭州310014 [2]杭州市杭机数控机床有限公司,浙江杭州311100

出　　处：《机电工程》2015年第8期1092-1095,共4页Journal of Mechanical & Electrical Engineering

摘　　要：针对曲轴端面加工中心动态特性要求高以及立柱在不同工况下表现出不同的动态响应特性等问题,对立柱结构进行了动力学研究。基于ANSYS的动力学分析理论,对机床立柱模型进行了适当的简化,接触面间的接触特性采用六节点的等参数单元模拟结合部的接触特性,建立了动力学仿真模型。对结构进行了模态分析以及动态载荷下的谐响应分析,获得了机床结构的振动特性和变形分布规律;对不同工况下立柱的动态响应情况进行比较,提出了不同工况对立柱动态响应的影响规律。研究结果表明,随着主轴箱高度提高,结构固有频率有所改变,立柱动态响应越发明显;不同工况下立柱均在一阶固有频率附近发生最大位移;还明确了结构刚度薄弱位置,为进一步优化结构刚度提供了理论依据。Aiming at high requirement of dynamic characteristics and different performances of the column in different working condition, the dynamic analysis of the column was established. With original data from structure simulation, the structure of column was simplified appropri- ately based on ANSYS. Contact characteristic of joint part was simulated by 6 node spatial isoparametric finite element. The vibration proper- ties, the deformation of the machine tool ~was obtained by the modal analysis and dynamic response analysis under the dynamic loads. Accord- ing to the comparation of dynamic responses of the column in different working conditions, the regular of dynamic response was summarized. The results indicate that inherent frequency will change and dynamic response will enhance with the headstock rising. The max dynamic re- sponse occurs near first mode inherent frequency in every working condition. These analyses also confirm the weak stiffness position of the structure and offer some theoretical basis for more reasonable stiffness arrangement of the structure.

关 键 词：曲轴端面加工中心 有限元分析 模态分析 谐响应分析 结构刚度 

分 类 号：TH113[机械工程—机械设计及理论] TH122