数控弧齿铣齿机的切削动力学研究  

Study on Cutting Dynamics of a Numerical Control Bevel Gear Machine Tool

作　　者：辛志杰[1] 徐燕申[1] 郭志全[1] 满佳[1] 林汉元[2] 

机构地区：[1]天津大学 [2]天津第一机床总厂,天津300180

出　　处：《中国机械工程》2006年第21期2266-2270,共5页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50275105)

摘　　要：以一台数控弧齿铣齿机为例,分析了机床结构及其受力特点,结果表明,切削分力的大小和方向在从切入到切出的过程中变化很大,造成了铣齿过程的不稳定。通过测量刀具和工件间相对激振的频率响应曲线,分析出机床结构存在两个薄弱模态对应的模态频率。试验模态分析和机床结构有限元计算均验证了结构薄弱模态的存在,并得到了相应的振型特点。谐响应分析表明,机床每一切齿走刀过程的切入和切出期间,不同大小和方向的切削力激发了机床结构相应的薄弱模态。机床的自激振动试验验证了谐响应分析的结果,并得到了稳定的切削区间。Taking a numerical control bevel gear machine tool as an example, the structure of machine tool and characteristics of force were analyzed. As a conclusion, different sizes and directions of the cutting forces are the reasons of instability in the course of cutting. Modal frequency of two weak mode corresponding to the structure is construed through measured frequency response curve between tool and work piece when there are a relative stimulation. The two weak modes are validated both by analysis of test mode and FEM calculation of machine tool structure, and the vibration characteristics are obtained. The weak modal frequency relation to machine tool structure is excitated by cutting forces in different sizes and directions in the course of cutting start and cutting end to each feed through harmonic analysis. The result of harmonic analysis is validated through machine tool test of self--excitation vibration, and the stable region is found.

关 键 词：数控弧齿铣齿机 铣削颤振 模态分析 谐响应分析 自激振动测量 

分 类 号：TG610.13[金属学及工艺—金属切削加工及机床] TB122[理学—工程力学]