Shevchenko O., Zharov A.A.
National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv, Ukraine (
Шевченко А.В. д.т.н., проф., Жаров А.А.
НТУУ «Киевский политехнический институт», г. Киев ,Украина
ВЛИЯНИЕ ОРИЕНТАЦИИ ГЛАВНЫХ ОСЕЙ ЖЕСТКОСТИ УПРУГОЙ СИСТЕМЫ ИНСТРУМЕНТА НА УСТОЙЧИВОСТЬ ПРИ ТОКАРНОЙ ОБРАБОТКЕ
Abstract. Purpose. Research of dynamic quality coefficients of the cantilevered toolholders and definition of directions of heightening of the conditions of chatter stability at turning.
Design/methodology/approach. In a paper it is shown, that essential effect on a level of relative oscillations of the cutter and a workpiece at turning is related with an angle of rotation of principal axises of a stiffness of an elastic-system of the toolholder and selection of the proportions of stiffness of elements of system. Proposed the theory, which defines conditions of raise of a chatter stability of machining by the nonrigid toolholders and consider a rule of orientation of the principal axises of stiffness of a toolholder in an elastic subsystem of cutter-saddle concerning to a cutting force direction.
Findings. As a result of mathematical simulation the complex mathematical model of the closed dynamic system of a lathe is developed. This model allows to evaluate influence of parameters of the nonrigid toolholders on accuracy of the form of machined surface.
Originality/value. It is shown, that the cutter-saddle elastic-system have the most chatter stability at machining if the angle of rotation of principal axises of a stiffness of this system is equated to half of angle of a cutting force direction. On the basis of the results of theoretical and experimental researches the recommendations for designing and a effective using of nonrigid toolholders at turning are given.
Keywords: nonrigid toolholder, oriented axis’s of stiffness, turning, chatter stability
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