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The friction effects for contact force analysis of three-axes CNC machine tool

Yunn-Lin Hwang (Department of Mechanical Design Engineering, National Formosa University, Huwei, Taiwan)
Thi-Na Ta (Institute of Mechanical and Electro-Mechanical Engineering, National Formosa University, Huwei, Taiwan)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 17 August 2018

Issue publication date: 13 November 2018

120

Abstract

Purpose

The purpose of this paper is to study the influence of friction on static and dynamic characteristics, as well as the strength and lifetime of a flexible three-axes computer numerical control (CNC) machine tool.

Design/methodology/approach

The machine tool is first modeled by using finite element method to analyze static structure with frictionless surface-to-surface contact type. Because the machine tool structure is becoming more and more sophisticated over time, the significant influence of contact conditions between structural elements on the dynamic characteristics of the whole structure must be considered. To examine the dynamic effects caused by inertia forces and displacement of moving bodies on contact stress, the coefficient of friction between two contact bodies is added to perform dynamic simulation and compare the results with the static analysis results.

Findings

Distribution of stress and contact forces in solid-flexible contact is also studied by using the fundamental dynamic characteristics of a bushing joint.

Originality/value

Finally, the influence of dynamic structure, cutting conditions and material properties on the strength and lifetime of the CNC machine tool is discussed by using fatigue analysis. Consequently, this research can be used for efficient simulation of structural dynamics, lifetime assessment and interactions of the real CNC machine with the machine tool structure in a virtual environment.

Keywords

Acknowledgements

This paper forms part of a special section “Advances in Engineering Tribology Technology (ICEATAT2016)”, guest edited by Jeng-Haur Horng.

This research work is supported by Ministry of Science and Technology of Taiwan under the grant contracts MOST 105-2622-8-150-001-TE3, MOST 104-2622-E-150-009-CC3 and CTSP-105AG04.

Citation

Hwang, Y.-L. and Ta, T.-N. (2018), "The friction effects for contact force analysis of three-axes CNC machine tool", Industrial Lubrication and Tribology, Vol. 70 No. 8, pp. 1527-1535. https://doi.org/10.1108/ILT-02-2017-0045

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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