Dynamic Analysis And Stability Prediction For The High-speed Spindle System Of Cutting Thin-walled Workpiece

Stability prediction of the spindle system is the premise of developing and optimizing the processing technology in the process of machining thin-walled workpieces. Traditionally, the analysis pattern only considering the flexibility of spindle-tool system is effective for large rigidity workpieces. But it is not applicable to low rigidity workpieces because of structural features. Thin thin-walled workpiece must be as an important factor to consider for high-speed spindle system cutting workpiece. This paper studied dynamic analysis and stability prediction of cutting system focuses on the coupling effect between the spindle system and the workpiece system.Firstly, the cutting stability prediction method under the premise of considering only spindle system is studied. Considering only the spindle system, had the finite element modeling and dynamic analysis using the method of finite element, and got the FRF of the tip point. Furthermore, the theory of stability prediction and the analysis procedure considering the dynamic characteristics of spindle system are provided, and described the stability lobes diagram.Secondly, the cutting stability prediction method under the premise of considering only workpiece system is studied. Considering only workpiece system, had the finite element model using the method of finite element, then had dynamic analysis and stability prediction. In order to verify the correctness of the analysis method, this paper carried out experimental study. The results shows that the experimental results are similar to the analysis results, in other words, the proposed method is reasonable.Thirdly, the model method and the analysis of cutting stability are studied on thin-walled workpiece-spindle coupling system. According to the analysis of dynamic interaction between the two sub-systems, the coupling model and dynamic analysis are completed. The method of coupling system stability prediction and prediction procedure are proposed creatively. And the effects of material parameters of thin-walled workpiece are analyzed, on coupling system machining stability.Finally, the effects of the time-varying characteristics of the mass of workpiece and the cutting point location on coupling system stability are studied. The dynamic analysis model of cutting system is created considering time-varying factors, and the method of cutting stability prediction and forecasting process are proposed. Then, the process of thin-walled workpiece is divided into a number of processing stages in order to simulate real processing environment. Furthermore, the effects of the thin-walled workpiece time-varying characteristics on cutting system stability are analyzed by 3D stability lobes diagram.The research of this paper,on the one hand, can be in the service of high-grade machine tool research and development and optimize dynamics performance of spindle system. On the other hand, can provide reference for optimizing the processing technology of thin-walled workpiece.