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Prediction of thermal growth in a high-speed spindle by considering thermo-mechanical behavior

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Yüksel, Esra and Budak, Erhan and Özlü, Emre and Oral, Ahmet and İğrek, Fatih and Tosun, Fulya (2021) Prediction of thermal growth in a high-speed spindle by considering thermo-mechanical behavior. In: 2nd International Conference on Thermal Issues in Machine Tools, Prague, Czech Republic

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Official URL: http://dx.doi.org/10.17973/MMSJ.2021_7_2021055

Abstract

Continuous rotation of spindle bearings and motor cause thermally induced structural deformations and thermal growth, which is one of the main reasons for machining errors. A positive feedback loop between bearing preload and heat generation causes preload variations in spindle bearings. These preload variations demonstrate a nonlinear transient behavior until the gradual expansion of outer bearing rings after which the thermally induced preload variation behaves steadily. In this study, a Finite Element (FE) framework is presented for predicting steady preload variation on spindle bearings. The method involves a thermal loading model and a transient contact analysis. In the contact analysis phase bearing contact deformations (penetration and sliding) and pressure are predicted by considering contact algorithms in an FE software. A transient spindle simulation in FE is employed to predict the bearing temperature and thermal spindle growth by using the proposed method. The performance of the method is demonstrated on a spindle prototype through bearing temperature and thermal deformation measurements. Results show that the proposed method can be a useful tool for spindle design and improvements due to its promising results and speed without the need for tests.

Item Type:Papers in Conference Proceedings
Uncontrolled Keywords:Bearing Preload; Contact; Spindle; Thermal
Subjects:T Technology > TJ Mechanical engineering and machinery > TJ241-254.7 Machine construction (General)
ID Code:41957
Deposited By:Erhan Budak
Deposited On:28 Aug 2021 00:20
Last Modified:28 Aug 2021 00:20

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