Research on Optimal Cutting Speed Range of Active Magnetic Suspension Electric Spindle
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摘要: 为研究主动磁悬浮电主轴在不同速度区间内的振型和振幅对工件加工精度的影响过程和机理，基于转子动力学、电磁学和金属切削理论，采用有限元法对"磁悬浮轴承-主轴"系统在切削过程中的一系列物理现象进行理论分析和定量解释。结果表明：系统振型是影响系统运行品质及加工质量的重要因素；主轴的最佳切削速度由主轴的振型、工件形位精度及系统在负载激励下的动态响应共同决定；工件的实际形位精度由系统在负载激励下的最大单向振动响应幅值决定。Abstract: In order to study influence of vibration mode and the amplitude of active magnetic suspension spindle in different speed ranges on the impact process and the mechanism of workpiece machining precision, based on the rotor dynamics, electromagnetism and metal cutting theories, the finite element method is employed to analyze theoretically and interpret quantitatively a series of physical phenomena in the process of cutting for magnetic levitation bearing spindle system. The results show that the vibration mode of the system is an important factor affecting the quality of system operation and processing. The optimal cutting speed of the spindle is determined by the vibration mode of the spindle, the shape and position accuracy of the workpiece and the dynamic response of the system under load excitation. The actual form and position accuracy of the workpiece is determined by the maximum amplitude of unidirectional vibration response of the system under load excitation.
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Key words:
- magnetic bearing /
- motorized spindle /
- modal analysis /
- vibration response /
- machining accuracy /
- finite element method /
- simulation
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表 1 前6阶固有频率、临界转速与振型
阶数 频率f/Hz 临界转速/(r·min-1) 振型 1 982.37 58 942.2 摆动 2 1 824.3 109 458 弯曲 3 2 195.4 131 724 弯曲 4 2 195.5 131 730 摆动 5 2 368.5 142 110 弯曲 6 2 852.9 171 294 弯曲 
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