Application And Theory Study Of Turning Chatter Suppression Based On ERF

Cutting chatter during machining process is one of the important factors influence quality of products and obstacle to factory automation. Therefore, the chatter online monitoring and control are to be key art to improve the stability of machining process. This dissertation applied electrorheological (ER) technology in machining chatter control, and results were satisfied and innovative.First, one kind of damp tunable chatter suppression equipment based on ER fluids double electrodes composite structure and one kind of frequency tunable cutting chatter suppression structure based on intelligent ER fluids damper were designed to the vibration characteristics of slender parts machining.. The rules of their static and dynamic properties under different electric fields were tested through static loading tests and excitation tests respectively. Related theoretic models were established to study how to realize chatter suppression through changes of structure stiffness and damp of cutting system under this two ERF structures. And the two structures were applied in chatter suppression of turning successfully. This dissertation carried out a series of experiment under different cutting conditions and different materials of workpieces with different electric fields added on this two structures, all the experiment results showed that this two kinds of chatter suppression ERF structure can not only control the chatter in turning operation efficiently, but can improve the surface quality of the workpiece, and got different results with same conditions under the two structures.Secondly, composition selection, influence factors, stability, electrorheological effect and so on properties of ER material were studied through theoretic discussion and experiments to ensure electric control properties of ERF chatter suppression structure and equipment stable. And one kind of advanced ERF was developed, which has excellent stability, low cost, environmental protection, and all kinds of ER effect indexes are near to or better than present products selling now.Thirdly, chatter suppression function of the chatter suppression structure of ERF damper were analyzed thoroughly theoretically with mathematical model established and chatter suppression function conditions of the structure were analyzed.Fourthly, chatter suppression function of the chatter suppression equipment of the ERF double electrodes composite structure were analyzed thoroughly theoretically with viscidity- elasticity plastical mathematical model established and charter suppression function conditions of the equipment were given, so were corresponding improvement measures.Finally, based on mechanism analysis of all kinds of chatters, this dissertation discussed their recognition characteristic parameters and stable conditions of corresponding cutting systems. With theoretic study of dynamic force and regenerative chatter during machining process of slender parts, this dissertation carried out theoretic study and experiment analysises of the whole cutting system, established a two freedoms model of the cutting system, discussed its stable conditions and chatter type. With experiments simulating system property of practical cutting process, this dissertation carried out excitation tests of cutting system under former two kinds ERF structures, established their two freedoms system model, discussed their chatter suppression function rules respectively, explained their chatter suppression results respectively.