Abstract
The letter presents an analysis of interference fit of the electric spindle at different rotor speeds due to the influence of centrifugal force and provides a theoretical formula showing the relationship of the speed, stress on the rotation speed. The letter also established a finite element model of the interference fit. The study found that as the rotation speed increases, the interference and contact stress between the spindle and the rotor gradually decrease, and the reduced speed is proportional to the square of the rotation speed.
Highlights
Open AccessAs the core component of CNC machine tools, electric spindle has the advantages of compact structure, stable operation and high speed, and is widely used in the field of CNC machining [1]
The letter presents an analysis of interference fit of the electric spindle at different rotor speeds due to the influence of centrifugal force and provides a theoretical formula showing the relationship of the speed, stress on the rotation speed
When the electric spindle is running at high speed, the spindle and the rotor will expand to different degrees under the action of centrifugal force, which will affect the interference fit characteristics between the spindle and the rotor
Summary
As the core component of CNC machine tools, electric spindle has the advantages of compact structure, stable operation and high speed, and is widely used in the field of CNC machining [1]. In order to ensure the machining accuracy and transmission capacity of the electric spindle, an interference connection is adopted between the spindle and the rotor, and the amount of interference will affect the overall cutting performance and processing efficiency of the machine tool [2]. If the interference is selected too small, the extrusion force between the spindle and the rotor will be small, and sufficient torque will not be transmitted, or the mating surface will slide relatively, which will aggravate the wear of the spindle and affect the service life of the machine tool [5] [6]. Knowing the interference between the spindle and rotor during the high speed, one can analyze the optimum transmission capacity to improve the processing quality of the parts and life of the machine tools
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