Papers by Keyword: Three-Dimensional Stability

Abstract: With the limit equilibrium method for the rigid body, this paper deduces a three-dimensional analysis method for the stability against sliding of concrete dam on rock foundations with mud layers on the basis of the stability against sliding of wedge. The engineering practices show that it is economical and reasonable to apply the method given here to the analysis for the stability of concrete dam foundation with mud layers in the case that the dam axis being not parallel to the strike of mud layers.

Abstract: According to the model of three-dimensional stability and the relationship between the parameters of oblique cutting and milling coefficients, this paper analyzes the influence of the cutter geometry parameters (helix angle, normal rake angle) on the three-dimensional stability of the spindle speed, axial and radial depths. On the same cutting condition, it should choose the cutter of having the bigger helix angle and normal rake angle to cut the thin-walled plate, which can increase the stability of cutting process and improving efficiency and quality.

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.