Mixed Lubrication Model for Cold Rolling Considering the Inlet and Deformation Zones
Sprache des Titels:
Englisch
Original Buchtitel:
ASME 2012 International Manufacturing Science and Engineering Conference (MSEC 2012)
Original Kurzfassung:
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 nonlinear
and coupled equations for the latter zone are solved
simultaneously by applying a variant of the well-known damped
Newton-Raphson method.