数控龙门铣床滑枕的动态特性分析及改进  

Dynamic Characteristics Analysis and Imprvoed Design of the Ram of CNC Planer Type Milling Machine

作　　者：胡汝凯 黄美发[1] 张奎奎[1] 杨武军 

机构地区：[1]桂林电子科技大学机电工程学院,广西桂林541004 [2]桂林机床股份有限公司,广西桂林541004

出　　处：《组合机床与自动化加工技术》2014年第5期43-45,49,共4页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：2011年广西制造系统与先进制造技术重点实验室主任课题(桂科能11-031-12-002);数控滑枕床身双面铣床开发(桂科攻11107002-29)

摘　　要：滑枕是数控龙门铣床中必不可少的关键零部件,也是影响机床加工精度的薄弱环节。采用有限元分析软件ANSYSworkbench对现有的方滑枕进行模态分析,在三维实体模型的基础上建立模态分析的有限元模型,研究滑枕的无阻尼自由振动,求解得出滑枕的前六阶固有频率和主振型。经过对分析结果的研究发现方滑枕低阶频率接近于滑枕内部主轴的激振频率,容易引起滑枕与滑枕内部主轴共振。为了解决现有方滑枕因低阶频率偏低而引起的滑枕与主轴共振的问题,设计了一种圆滑枕,通过分析求解得出圆滑枕的前六阶固有频率相对于方滑枕的前六阶固有频率大幅提高。Ram is a key and necessary part and is also the weak link of the machining precision in a CNC planer type milling machine. We adopt finite element analysis software ANSYS workbench to analyze the modal of square ram by establish the finite element model of 3D solid model. We research the undamped free vibration of the ram and solve the fronts of sixth order natural frequency and principal model. The analysis results show that the fronts of sixth order natural frequency are close to the excitation frequency of the spindle. And this could easily cause the resonance between the ram and the spindle. We designed a new type of round ram to enhance the fronts of sixth order natural frequency.

关 键 词：数控龙门铣床 方滑枕 模态分析 固有频率 圆滑枕 

分 类 号：TH166[机械工程—机械制造及自动化] TG502.3[金属学及工艺—金属切削加工及机床]