Papers by Keyword: Thin-Walled Plate

Abstract: In the process of milling thin-walled plate, chatter is one of the major limitations on productivity and part quality even for high speed and high precision milling machines. Therefore, it is necessary to avoid chatter with a suitable choice of cutting condition. This paper studies the dynamic stability models of milling the thin-walled plate by analyzing the geometrical relationship of cutting, and derives the mathematic expressions in theory. Moreover, this paper develops a three-dimensional lobes diagram of the spindle speed, the axial depth and the radial depth. Through the three-dimensional lobes, it is possible to choose the appropriate cutting parameters according to the dynamic behavior of the chatter system.

Abstract: In order to restrain the regenerative chatter and improve the processing efficiency of thin-walled parts, stability analysis for the milling of thin-walled parts should be the critical element in the whole process of analysis for thin-walled parts. This paper mainly introduces the stability analysis for the milling of thin-walled plates. The two-dimensional stability lobes of milling of plate plotted, the effect of different modal parameters on the stability of milling of plate is investigated. It is shown that single mode will reduce the range of stability zone of main mode if the stability lobes of single mode are intersectant with that of main mode and the range of stability zone will be larger and the stability lobes will be regular on condition that the mode is symmetrical.

Abstract: Chatter phenomenon often occurs during end milling of metal-cutting and becomes a common limitation to achieve high productivity and part quality. This paper studies the relationship expression between the parameters of oblique cutting and milling coefficients by analyzing the geometrical relationship of oblique cutting, and derives the mathematic expressions in theory between the cutter parameters and chatter. For the purpose of chatter avoidance, this paper studies the effect of helix angle and normal rake angle on milling stability under the condition of the same milling parameters, and plots the three-dimensional stability lobes of the spindle speed, axial and radial depths. It can be found that the milling stability is increased with the increment of helix angle and normal rake angle. Through the three-dimensional lobe, it is possible to choose the appropriate cutter parameters to reduce and avoid the chatter.