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Chatter vibration highly limits the accuracy and the material removal rate of numerical control (NC) machining operations. In this paper, an adaptive spindle speed selection method, based on an analysis using the semi-discretization method, is proposed to avoid and minimize chatter vibration in high-precision NC machining. Moreover, the proposed method is robust to modeling uncertainty and changing...
The productivity of numerical control (NC) machining is highly limited by the occurrence of chatter vibration. Chatter stability analyses are widely studied to predict chatter vibration. However, these analyses often fail to provide reliable prediction results because the parameters in the vibration model are sensitive to identification errors, mechanical deterioration and thermal changes. On the...
The traditional methods for mitigating chatter instability are called passive control which focuses on optimizing working spindle speeds and depths of cut. But they have inherent disadvantages in gaining highly efficient machining in milling processes. By contrast, the research in this paper is along the line of active control. Specifically, an adaptive algorithm is developed based on Fourier series...
The milling of thin-walled plate has become a seriously complex problem. Along the machining of this type of structure, large quantities of material are removed with the risk of the instability of the process. This paper studies the effect of helix and normal rake angles on milling stability by analyzing the geometrical relationship of oblique cutting, and obtains the mathematic relationship expressions...
Chatter is an instability phenomenon in machining processes which limits productivity and results in inferior workpiece quality, noise and rapid tool wear. The increasing demand for productivity in the manufacturing community motivates the development of an active control strategy to shape the chatter stability boundary of manufacturing processes. In this work a control methodology for the high-speed...
A method for predicting dynamic stability limit of thin-walled workpiece high-speed milling process is described. The proposed approach takes into account the variations of dynamic characteristics of workpiece with the tool position (or machining time). A dedicated thin-walled workpiece representative of a typical industrial application is designed and modeled by finite element method. The curvilinear...
In order to control the cutting chatter in machining of thin-walled workpieces, the dynamic milling model of thin-walled workpieces is analyzed and built based on the analysis of degrees in two perpendicular directions of tool-workpiece system. In high speed milling of 2A12 aluminum alloy, the compensation method based on the modification of inertia effect was proposed and accurate cutting force coefficients...
Machining problems often occur when the fillet area of a part is being milled. A general geometrical model of circular milling has been established, on the basis of which the maximum radial engagement angle formula is derived. The impact of cutting conditions on the maximum radial engagement angle is investigated through simulation. As the normal cutting force has a major impact on the machining deformation,...
Chatter vibration in milling often results in poor surface finish and rapid tool wear, consequently limiting productivity. Thus, chatter suppression is one of the most important themes in industry. Self-excited chatter vibration in milling is generally caused by two kinds of mechanisms, i.e., regeneration and mode-coupling, and both mechanisms should be handled simultaneously to suppress the chatter...
Chatter phenomenon often occurs during peripheral milling of thin-walled plate, which affect the quality of the finished part, the tool life and the spindle life. Therefore, it is necessary to avoid chatter with a suitable choice of cutting condition. Several stability models only emphasize the axial depth for chatter free machining. In this paper, it is shown that the radial depth is the same important...
Whether in traditional machining fields or modern flexible manufacturing systems, the workpiece-holding is the first issue of the machining operation to be confronted. To ensure the machining accuracy of specific dimensions, it is necessary to correctly determine the position of the workpiece related to the cutting tool and immobilize this correct position during entire machining operation. In this...
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