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Mixed Lubrication Model for Cold Rolling Considering the Inlet and Deformation Zones

[+] Author Affiliations
Martin Bergmann, Klaus Zeman, Alexander Kainz

Johannes Kepler University Linz, Linz, Upper Austria, Austria

Konrad Krimpelstätter

Siemens VAI Metals Technologies GmbH, Linz, Upper Austria, Austria

Dieter Paesold

Voestalpine Stahl GmbH, Linz, Upper Austria, Austria

Peter Schellingerhout, Bas Smeulders

Quaker Chemical B.V., Uithoorn, The Netherlands

Paper No. MSEC2012-7245, pp. 103-112; 10 pages
doi:10.1115/MSEC2012-7245
From:
  • ASME 2012 International Manufacturing Science and Engineering Conference collocated with the 40th North American Manufacturing Research Conference and in participation with the International Conference on Tribology Materials and Processing
  • ASME 2012 International Manufacturing Science and Engineering Conference
  • Notre Dame, Indiana, USA, June 4–8, 2012
  • Conference Sponsors: Manufacturing Engineering Division
  • ISBN: 978-0-7918-5499-0
  • Copyright © 2012 by ASME

abstract

A mixed lubrication model for cold rolling was developed by separating, according to common concepts, the domain of calculation into two zones: the inlet zone and the zone of plastic strip bulk deformation. The analysis of the inlet zone mainly focuses on film formation from different lubricants based on the evolution of layers consisting of neat oil on the metallic surfaces. In the zone of plastic strip bulk deformation, contributions of boundary and hydrodynamic friction are modeled incorporating longitudinal and transversal roughness components. Lubricant pressure, which is influenced by the geometry of these roughness structures, is governed by hydrodynamic mechanisms. Additionally, lubricant temperature in the roll bite is predicted by an integrated thermodynamics sub-model. While coupling between the inlet and plastic deformation zones is performed iteratively, the highly non-linear and coupled equations for the latter zone are solved simultaneously by applying a variant of the well-known damped Newton-Raphson method.

Copyright © 2012 by ASME

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