Study Of Regenerative Turning Chatter Suppression Based On Giant Magnetostrictive Material

People did a multitude of research work about the vibrations during machining inorder to reduce or get rid of the vibrations as the demand of efficiency and accuracy forthe machining getting higher. Regenerative chatter is a kind of self-excited vibrationwhich will reduce the part finish, deteriorate the wear of the cutter and machine tool,generate lots of noise and cut down the productivity. This paper aimed at the mechanismresearch of the regenerative chatter and also did some initial work about chattersuppression.First of all, the research backgrounds and present situations of cutting chatterresearch were presented. The sponsor and research meaning of this project were alsoclarified. The fundamental concepts of Arnold-type chatter, mode coupling chatter andregenerative chatter were specified and the basic research method about chatter weregiven. The arrangement of research work of this paper was carried out.Secondly, the simplified regenerative chatter model was analyzed by analytical andsimulation method such that the chatter lobe diagram and phase diagram can beobtained. Then the model data of the machine tool were tested by the impact modeltesting such the comprehensive cylindrical regenerative turning chatter model can besimulated via the MATLAB/Simulink. The turning experiment was carried out and thechatter marks were found on the testing work piece. The experimental results werecompared with the simulation results and the average error was30.15%. Thisexperiment showed that the cylindrical regenerative turning chatter model built in thispaper can describe the actual chatter situation to some extent.What’s more, this paper did some chatter suppression work. The active vibrationcontrol method was chosen in order to suppress the regenerative chatter. The giantmagnetostrictive material was introduce and compared with the piezoelectric ceramics.A giant magnetostrictive actuator was designed as the actuator in the active vibrationcontrol and the PID controller was used as the control strategy. The dynamic model ofthe GMA was built and combined with the regenerative chatter model so that the activeregenerative chatter suppression model can be carried out and simulated via theMATLAB/Simulink. The simulation results showed that the active chatter suppressionprocess built in this paper had strong suppression effect on the chatter vibration.