Stiffness anisotropy effect on the cutting spindle motion dynamics

Power tool spindles are widely used in modern multi-operational technological equipment. The paper presents methods for theoretical analysis of the dynamic processes in the power tool spindle designed for the high-speed machining. A model of the spindle – tool dynamic system was developed, taking into account its stiffness anisotropy, friction, damping forces and the aftereffect processes in the spindle assembly elastic friction system. It is known that regeneration and superposition of certain vibration modes on the others exert the greatest influence on the subharmonic vibration during the high-speed rotor rotation. The paper proposes to increase stability of the spindle assembly system by changing the tool installation conditions. For this purpose, specially designed cutting and auxiliary tools were developed to eliminate the causes of subharmonic vibration. Construction of the mathematical models shows that those designs could significantly increase stability of the spindle assembly dynamic system. Simulation results were confirmed by experiments.
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