薄壁零件铣削的磁流变弹性体吸振器的理论分析及试验

Theoretical Analysis and Experiment of Magneto Rheological Elastomer Vibration Absorber for Milling Thin-walled Workpiece

薄壁件由于刚性差,在铣削过程中难免会出现各种扰动,从而容易发生颤振,严重影响了加工零件的精度和表面质量。为了解决该问题,考虑到同种材料不同尺寸的工件,或者不同材料的工件其固有频率不同,提出了在加工过程采用变频率的磁流变吸振器(Magneto rheological elastomer(MRE)absorber)的方法。文中详细介绍了磁流变吸振器的设计过程,并对吸振器的在不同电流下的频率进行测试,分析了磁流变吸振器在铣削加工中使用性能,对比铣削系统的稳定性叶瓣图及抗干扰的能力。结果表明所设计的变频率磁流变吸振器对于防止切削颤振是可行的,并且可以通过改变通电电流将其应用于不同材料的工件,不同尺寸的工件。

Due to the poor rigidity of thin-walled work-piece,it is inevitable that there are the various disturbances in the milling process,which is prone to chatter and seriously affects the accuracy and surface quality of work-piece.Considering the different sizes of the same material and the different natural frequencies of the different materials,to solve this problem,a method with the variable frequency magneto rheological elastomer(MRE)absorber in the machining process is proposed.In this paper,the design process of MRE absorber is introduced in detail,and the frequency of the absorber under different current is tested,and the performance of MRE absorber in milling process is analyzed.The stability lobe diagram and anti-interference ability of milling system are compared and analyzed.The results show that the designed variable frequency MRE absorber is correct and feasible to prevent cutting chatter,and it can be applied to different materials and different sizes of work-pieces by changing the current.