Abstract
The mathematical model of the process of turning, which takes into account the nonlinearity dependence between cutting force and parameters of cutting mode, the time constant of chip formation and processing "on the trail". It is established that the main factor determining the occurrence of regenerative oscillations in the technological system of machining, is the handling on the trail, when changes in the stock, created in a single revolution of the workpiece, with the same natural frequency back into the cutting zone on the following turn that and supports self-oscillations of the system. Thus, the effect of suppressing regenerative oscillations with the option SSV (Spindle Speed Variation) is determined by the frequency change of the track and its mismatch with the natural frequency of the technological system of machining, and soothes the system. Created an application program simulation allows you to perform a targeted search for the best combination of parameters of the harmonic law of change of spindle speed for each case of treatment.
Highlights
Результаты из рекламного ролика [1] фирмы показаны на рис.1, где применено изменение скорости вращения шпинделя по гармоническому закону (SSV ON) с амплитудой 150об/мин и периодом 1,2с
The mathematical model of the process of turning, which takes into account the nonlinearity dependence between cutting force and parameters of cutting mode, the time constant of chip formation and processing "on the trail"
It is established that the main factor determining the occurrence of regenerative oscillations in the technological system of machining, is the handling on the trail, when changes in the stock, created in a single revolution of the workpiece, with the same natural frequency back into the cutting zone on the following turn that and supports self-oscillations of the system
Summary
Разработана математическая модель процесса токарной обработки, которая учитывает нелинейность зависимости силы резания от параметров режима резания, постоянную времени стружкообразования и обработку «по следу». Установлено, что основным фактором, определяющим возникновение регенеративных колебаний в ТОС, является обработка по следу, когда изменения припуска, созданные на одном обороте заготовки, с той же частотой собственных колебаний возвращаются в зону резания на следующем обороте, что и поддерживает автоколебания системы. Созданная прикладная программа моделирования позволяет выполнять целенаправленный поиск наилучшего сочетания параметров гармонического закона изменения скорости вращения шпинделя для каждого конкретного случая обработки.
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