Abstract
This article presents a thermo-mechanical coupled dynamic model for high-speed motorized spindles. The proposed model includes an angular ball bearing model, a thermal model, and a rotor dynamic model. The coupling relationship among these submodels is analyzed, and a solution procedure for the integrated model is designed. Based on the proposed model and solution procedure, the dynamic behaviors of the spindle system and the effects of the thermal displacement of the system on the behaviors are quantificationally discussed. Finally, an integrated dynamic test is carried out on a D62D24A-type motorized spindle, and the good agreement between the mathematical results and the experimental data indicates that the proposed model is capable of accurately predicting the dynamic properties of motorized spindles, and the accuracy of the model is improved when considering the thermo-mechanical coupled factor. The conclusions are useful for the dynamic design and the thermal compensation control of high-speed motorized spindles.
Highlights
The high-speed motorized spindle combines the motor, transmission, actuator, and control system, which achieves the ‘‘nearly zero transmission.’’1,2 It is an intelligent unit part and includes the technologies of bearing, cooling, lubrication, drive, rotor dynamics, and so on
As the core equipment in computer numerical control (CNC) machine tools, its dynamic behaviors directly influence the machining accuracy and efficiency, while the built-in motor increases the difficulty of predicting the dynamic behaviors of the spindle system.[4]
Motorized spindle is a thermo-mechanical coupled system a lot of researches focused on the dynamic behaviors of the system
Summary
The high-speed motorized spindle combines the motor, transmission, actuator, and control system, which achieves the ‘‘nearly zero transmission.’’1,2 It is an intelligent unit part and includes the technologies of bearing, cooling, lubrication, drive, rotor dynamics, and so on. Jorgensen[10] calculated the friction moment and power loss of the bearing with the quasi-static mechanics model and discussed the influence of working parameters on the temperature rise of the system based on the heat transfer network method.
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