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Date of Publication:2022-10-09

Journal:振动工程学报

Issue:6

Page Number:600-607

ISSN No.:1004-4523

Abstract:High-speed motorized spindles have been successfully applied in ultra-high speed grinding. But the high-order harmonic mechanical-electric coupling vibration caused by high-frequency converting current have significant effect on the stability of grinding systems and grinding quality and its dynamical mechanism is still ambiguous. The reason of the high-order harmonic mechanical-electric coupling vibration caused by high-frequency converting current cannot be quantitatively explained by using the traditional mechanical models. Therefore, special research on it is required to be conducted. Based on the traditional mechanical model of a grinding wheel rotor, a mechanical-electric coupling model was established. It consists of an inverter, a motorized spindle, a grinding wheel and grinding loads. Some typical non-stationary processes, including the starting, the speed rising and break in grinding loads have been studied by using the new model. Besides, experimental research was performed on an ultra-high speed grinder. The physical mechanism of mechanical-electric coupling vibration of an ultra-high speed grinding system driven by a motorized spindle caused by high-frequency converting current of power switches was revealed. A material strategy of suppressing mechanical-electric coupling vibration was proposed by optimization of inverter operating parameters.

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