Prediction of the Structural Dynamic Behavior of High Speed Turning Machine Spindles

Abstract:

This paper presents a method to investigate the dynamic behavior of a turning high-speed spindle system. The machine tool main spindle unit is focused on direct driven spindle units for high-speed and high performance cutting. This paper analyzes the static behavior for a turning machine spindle and presents some activities to improve the CAD model for such complex systems. The proposed models take into account the spindle with the bearing detailed system. The analysis was performed during the design activity and was based on Finite Elements Method. Starting from the 3D model, using FEM done by means of ANSYS analysis, structural dynamic behavior was evaluated. The aim of this paper is to develop a finite element model of the machine spindle system and use this method for design optimization. The 3D model was designed using the Solidworks CAD software. In order to obtain accurate dynamic characteristics of the spindle-bearing system during the design stage, the finite element model is simulated using dedicated software, and a method in which springs and damping units imitate bearing support. The proposed method can predict the regular pattern in which bearing stiffness and bearing span affect natural frequency and harmonic response. The research demonstrates that this method predicts the dynamic characteristics of the spindle-bearing system therefore it can be a reference for dynamic optimization design of spindle-bearing systems in turn-milling centers. The static analysis was presented in another paper. The thermal analysis will be presented in a future paper.

• Periodical: Applied Mechanics and Materials (Volume 555)
• Pages: 567-574
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.555.567
• Online since: June 2014
• Authors: Constantin Dogariu*, Doru Bardac
• Keywords: Finite Element Method (FEM), Frequency Response, High Speed Machining, Natural Frequency, Spindle

References

[1] Jay F. Tu - Nuggets of Mechanical Engineering – Revisit of the Free-Body Diagram Analysis and Force Flow Concept - International Conference on Engineering Education – ICEE 2007 Coimbra, Portugal September 3 – 7, (2007).

[2] C. H. Li, Z. R. Liu, Y. Zhou, Y. C. Ding - Investigation on critical speed and vibration mode of high speed grinder - NOISE & VIBRATION WORLDWIDE, November 2011, pp.47-54.

DOI: 10.1260/0957-4565.42.10.47

[3] Meilin Li, Xiaolong Shen - Critical Speed and Vibration Mode for Double-rotor Spindle System of High Speed Grinder - IEIT Proceedings Vol. 3 (2012) pp.81-85.

DOI: 10.5813/www.ieit-web.org/ijadc/2013.1.1

[4] Ashok S. Denis, Samuel G. L. - Least square estimation of harmonic components in radial error measurement of a miniaturized machine tool spindle – aspe. net publication, (2009).

[5] Lida Zhu, Chunxia Zhu, Tianbiao Yu, Jiashun Shi and Wanshan Wang - Dynamic Analysis and Design of the Spindle-Bearing System in Turn-milling Centre - Proceedings of the IEEE International Conference on Automation and Logistics August 18 - 21, 2007, Jinan, China, pp.2394-2398.

DOI: 10.1109/ical.2007.4338978

[6] Yuzhong Cao - Modeling of high-speed machine-tool spindle systems – PhD Thesis, The University of British Columbia, March (2006).

[7] Ṧooṧ L' - Contribution to the research of static and dynamic properties of CNC turning machine - STROJNỈCKY ĈASOPIS, 59, 2008, no. 5–6, pp.231-239.

[8] Deping Liu*, Hang Zhang, Zheng Tao and Yufeng Su - Finite Element Analysis of High-Speed Motorized Spindle Based on ANSYS - The Open Mechanical Engineering Journal, 1874-155X/11 2011, pp.1-10.

DOI: 10.2174/1874155x01105010001

[9] ** - Catalogs SKF, NSK, KOYO.