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Novel and efficient thermal error reduction strategy for machine tool performance improvement

Mian, Naeem S., Fletcher, Simon, Longstaff, Andrew P., Myers, Alan and Pislaru, Crinela (2008) Novel and efficient thermal error reduction strategy for machine tool performance improvement. In: Proceedings of Computing and Engineering Annual Researchers' Conference 2008: CEARC’08. University of Huddersfield, Huddersfield, pp. 15-22. ISBN 978-1-86218-067-3

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    Abstract

    The accuracy of a machine tool is affected by the heat generated during the machining process. Also, varying environmental conditions produce thermal gradients that flow through the machine structure. The heat passes through assembly joints and structural linkages in the machine where the roughness and form of the contacting surfaces affects the heat transfer coefficients. Measurement of the thermal behaviour and associated deformations in the structure is a time consuming procedure where machine downtime is a dominant issue. This paper discusses a novel offline technique using Finite Element Analysis (FEA) to simulate the thermal distribution and deformations during the spindle heating and cooling cycle in static conditions on a small Vertical Machining Centre (VMC) CNC machine. Detailed experimental testing of the temperature distribution in the machine and heat transfer work to obtain accurate values of the thermal contact resistance across the joints is reported. The obtained experimental results are evaluated and applied to the FEA software to obtain thermal distribution and associated deformations in a machine tool structure offline. The FEA simulated results are presented and are in close correlation with the obtained experimental results. FEA simulation enables efficient offline assessments of temperature distribution and displacements in the machine tool structures that result in a significant reduction in machine non-productive downtime while enabling characterisation under variable environmental conditions.

    Item Type: Book Chapter
    Uncontrolled Keywords: Finite element analysis, FEA, Thermal error, Thermal deformations, Machine tool accuracy
    Subjects: T Technology > TA Engineering (General). Civil engineering (General)
    Q Science > QA Mathematics > QA76 Computer software
    Schools: School of Computing and Engineering
    School of Computing and Engineering > Centre for Precision Technologies
    School of Computing and Engineering > Centre for Precision Technologies > Engineering Control and Machine Performance Research Group
    School of Computing and Engineering > Computing and Engineering Annual Researchers' Conference (CEARC)
    School of Computing and Engineering > Diagnostic Engineering Research Centre
    School of Computing and Engineering > Diagnostic Engineering Research Centre > Energy, Emissions and the Environment Research Group
    School of Computing and Engineering > Diagnostic Engineering Research Centre > Measurement System and Signal Processing Research Group
    School of Computing and Engineering > Pedagogical Research Group
    Related URLs:
    Depositing User: Graham Stone
    Date Deposited: 19 Mar 2009 12:13
    Last Modified: 21 Aug 2012 13:41
    URI: http://eprints.hud.ac.uk/id/eprint/3673

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