再生型车削颤振的动力学建模与稳定性分析  

Dynamics Modeling and Stability Analysis of Regenerative Turning Chatter

作　　者：邱辉[1] 李国平[1] 孙涛[1] 

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2016年第3期98-102,共5页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：浙江省自然科学基金(LY15E050005);浙江省公益性技术应用研究项目(2013C31017)

摘　　要：在分析再生型数控车削颤振产生机理的基础上,建立了再生型外圆车削颤振系统动力学模型,推导了稳定性极限切削深度和主轴转速与车削系统相关动力学参数的关系,通过Matlab软件仿真分析得到极限切削深度和主轴转速的稳定性叶瓣图.结果表明,提高机床振动系统的等效刚度、等效阻尼比能增大稳定性叶瓣图的稳定区域,而提高方向系数、切削刚度系数和切削重叠系数则使稳定性叶瓣图的稳定区域变小;提高机床振动系统固有频率会使稳定性叶瓣图曲线向右移动,更难激起车削系统的颤振.On the basis of the analysis of the mechanism of regenerative chatter in the computerized numerical control （CNC） lathing process, a dynamic model is constructed for the ex-circle turning chatter system and two formulas of the stability limit of cutting depth and the spindle speed related turning system of kinetic parameters are deduced. The stability lobes diagram of the cutting depth limit and spindle speed are obtained using the MATLAB software. Results of analysis show that improvement of the equivalent stiffness and equivalent damping ratio of vibration system can increase the stability lobes diagram’s stability region, but improvement of the direction coefficient, cutting stiffness coefficient and cutting overlapping coefficient shall compromise the stability of the stability lobes diagram area. On the other hand, improving the natural frequency of the machine tool vibration system makes stability lobes figure curve move to the right and harder to be activated. These simulation results can provide corresponding theoretical basis to suppress chatter in practical processing.

关 键 词：再生型车削颤振 动力学模型 稳定性叶瓣图 稳定区域 

分 类 号：TG519.1[金属学及工艺—金属切削加工及机床]