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Study on Nonlinear Dynamic Characteristics of Motorized Spindle Considering Toolholder Connection and Electromagnetism Under EHL Condition

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Abstract

Purpose

The nonlinear dynamic characteristics of the motorized spindle have a great influence on the precision of processed products in manufacturing. Aiming at the above issue, a new comprehensive motorized spindle dynamic model considering multiple factors was proposed in this paper to investigate its dynamic performance more seriously.

Methods

First, the angular contact ball bearing was mainly analyzed, in which the oil film thickness and stiffness were considered, and then a bearing mechanical analysis model was established based on the quasi–static analysis method. Simultaneously, the effect of the centrifugal force and gyroscopic moment of the ball on the contact angle was included in the bearing model. Second, the preload of the bearing was investigated, and the Hertz contact load on the rings was identified and classified. Next, the fit clearance between the outer ring and the bearing housing, the static eccentricity between the stator and rotor, and the static eccentricity angle were added in the spindle model, to study the dynamic performance of the rotor more truly and effectively. In addition, the contact characteristics of the cutter head and the rotor were presented in the model.

Results

The change of bearing contact angle has an important influence on the dynamic characteristics of the spindle as the contact angle becomes lager. Simultaneously, the clearance value of the bearing affects the unbalanced magnetic force. In addition, static eccentricity has a great effect on the dynamic behavior of the rotor. Under the same length error and length range, the impact of static eccentricity on the rotor dynamic performance is greater than that of fit clearance.

Conclusions

Various structural and dynamic parameters are coupled with each other in spindle dynamics. Therefore, it is necessary to systematically consider and analyze various factors to establish a comprehensive and effective dynamic model.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors would like to thank the Associate Editor and the anonymous reviewers for their keen and insightful comments which greatly improved the contents and the presentation of this article significantly.

Funding

The authors are grateful to the financial supports from National Natural Science Foundation of China (Grant No. 51775277).

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People’s Republic of China

    Chuan Su, Weifang Chen & Dan Wang

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  1. Chuan Su
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  2. Weifang Chen
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  3. Dan Wang
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Contributions

CS: Investigation, Visualization, Writing-Original Draft; WC: Funding Acquisition, Methodology, Supervision; DW: Conceptualization, Writing-Review and Editing.

Corresponding authors

Correspondence to Weifang Chen or Dan Wang.

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Su, C., Chen, W. & Wang, D. Study on Nonlinear Dynamic Characteristics of Motorized Spindle Considering Toolholder Connection and Electromagnetism Under EHL Condition. J. Vib. Eng. Technol. 12, 97–128 (2024). https://doi.org/10.1007/s42417-022-00830-3

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