Abstract
The paper determines the impact factors of high-speed spindle system including the centrifugal force, gyroscopic moments and the bearing stiffness softening, etc, then builds the general spindle-bearing FEM considering high speeds. Taking a motorized spindle as example, the effect of centrifugal force, gyroscopic effect, the radial stiffness and the coupling factors are analyzed qualitatively and quantitatively. Finally the research shows the variations of bearing radial stiffness, centrifugal force and gyroscopic moments have a significant effect on dynamics of spindle system in high speeds, while modeling the high speed spindle system, above factors must be considered.
Highlights
High-speed cutting is the method of processing parts using cutting speed and feed rate much higher than the conventional process
The study and optimization of high-speed spindle system dynamics is significant.As the spindle speed continues to rise, researchers[2,3,4] found that the dynamics of high-speed spindle system is significantly different from its dynamics in stationary state
This paper identifies the influencing factors of spindle system dynamics induced by high-speed, including centrifugal force, gyroscopic moment and bearing stiffness softening and so on
Summary
High-speed cutting is the method of processing parts using cutting speed and feed rate much higher than the conventional process (typically 5-10 times higher than conventional processing). This paper identifies the influencing factors of spindle system dynamics induced by high-speed, including centrifugal force, gyroscopic moment and bearing stiffness softening and so on. On this basis, the spindle speed - bearing finite element model considering rotating speed is established based on the FEM. Taking a motorized spindle as example, the impacts of the centrifugal force, gyroscopic moment, bearing radial stiffness and coupling effect of these factors on high-speed spindle system dynamics are investigated. High speed has a significant impact on the ball bearing stiffness, taking the motorized shaft system in the paper as an example. Using the Hamilton's principle combined with the bearing stiffness matrix obtaining the Lagrange operator of spindle system, and deducing the finite element motion equations with the impact of spindle speed in consideration
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