磁流变智能镗杆的切削颤振抑制机理研究  

Research on mechanism of cutting chatter suppression based on magnetorheological intelligent boring bar

作　　者：孔天荣[1] 梅德庆[1] 陈子辰[1] 

机构地区：[1]浙江大学机械与能源工程学院,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2008年第6期1005-1009,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50405036);浙江省自然科学基金资助项目(Y104462)

摘　　要：针对深孔镗削过程中的颤振问题,提出了一种基于磁流变液的智能镗杆构件,并根据深孔镗削颤振的特点建立了磁流变智能镗杆切削系统的动力学模型.结合该模型对镗削系统的稳定性进行了分析,发现当通过调节磁场强度使系统刚度或阻尼增大时,切削系统的稳定性将明显提高,同时对系统固有频率与稳定性的关系也进行了分析,发现随着系统固有频率的减小或增大,系统稳定性极限叶瓣曲线将向左或向右平移,其条件稳定区域也将随之发生改变.当系统不稳定时,只要适当改变系统固有频率,就可以使切削系统处于稳定区域内.为了验证抑振机理,对磁流变智能镗杆系统进行了切削颤振控制实验研究,结果表明,通过控制切削系统的固有频率在一定的范围内封闭型变化,可以有效地抑制镗削过程中颤振的发生.Based the characteristic of deep hole boring chatter, a dynamic model of magnetorheological （MR） intelligent boring was established by means of equivalent linearization technique. Analysis shows that the stability of the intelligent boring system will be improved when the system damping and stiffness increase. When the system natural frequency decreases or increases, the stability lobes will shift to left or right, and the conditionally stable region will change. Thereforewhen the cutting system is in a Unstable working condition, it can be restored to the stable status by changing the system natural frequency, Experiments of chatter suppression were conducted to verify this innovative cutting chatter suppression method based on MR intelligent boring bar. The results showed that the boring chatter can be suppressed effectively by adjusting the system natural frequency in a certain range

关 键 词：深孔镗削 颤振抑制 磁流变液 智能镗杆 稳定性 

分 类 号：TG502.36[金属学及工艺—金属切削加工及机床]