Improvement of an Iterative and Staggered Approach for a Model of Mixed-Lubrication in Cold Rolling

Stephany, Antoine; Ponthot, Jean‐Philippe

doi:10.1063/1.1766558

Cited by 5 publications

(7 citation statements)

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“…Equation ( 6) takes the form (7) by assuming that a steady-state flow occurs only in x i direction, the velocity has only one x i component which is dependent on the y i coordinate and pressure is independent of the vertical coordinate [15]. (7) Integrating speed (7), through thickness, yields to the fluid flow q between each pocket (8). (8) The fluid leakage evaluation (8) also called Couette flow with differential pressures [15], (q i per unit of width) is on variable plateaus' length due to plastic strain.…”

Section: Theorical Mixed Lubrication Formulationmentioning

confidence: 99%

“…When the hydrodynamic pressure generated by sliding in the lubricant, exceeds the die pressure, the MPHDL occurs, and lubricant escapes from the pocket in the sliding direction [6,7]. These mechanisms are influenced by various factors, such asrelative sliding velocity, viscosity of the lubricant, pocket geometry and networking, which depends on the initial surface topography [8,6]. Thus, in some papers, the methods of evaluation of surface topography (identication of lubricant pits and die marks) were proposed to improve the understanding of the evolution of topography during subsequent passes [9,10] with assumption on asperity crushing [9].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, in some papers, the methods of evaluation of surface topography (identication of lubricant pits and die marks) were proposed to improve the understanding of the evolution of topography during subsequent passes [9,10] with assumption on asperity crushing [9]. Numerical strategy to monitor change in asperity geometry and corresponding oil film thickness at the edge is given by coupling the hydrodynamic and the mass flow equation with the mechanical model for deformation of asperities [11,8,12]. Indeed, oil is carried down the die-workpiece at the entry area or is squeezed out.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Hybrid Fluid Structure Coupling: Application to Mixed Lubrication in Metal Forming

Deltombe

Belotserkovets

Dubar

2014

AMR

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The present paper deals with a sequential fluid structure coupling approach in order to solution the roughness prediction. The cold rolling model involves the strip with its asperities, the lubricant and the working roll. The strip asperities are modeled in 2D (trapezoidal shape) forming valleys and plateaus. Fluid flow rate between each valley full of lubricant is solved using local Couette's equation. Thus, the volume of lubricant trapped and its pressure are updated on the cold rolling model. During computations, the asperity is deformed from the entry to the exit to obtain its final shape. Global parameters such as front, back tensions, speeds are taken into account but also rheological (fluid, solid) and tribological behaviours.

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Section: Theorical Mixed Lubrication Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Hybrid Fluid Structure Coupling: Application to Mixed Lubrication in Metal Forming

Deltombe

Belotserkovets

Dubar

2014

AMR

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“…The second loop tries to set the inlet speed of the strip so that the exit tension force equals the one that has been specified. A fully detailed presentation of the equations can be found in Stephany [16,[18][19][20][21][22].…”

Section: Cold-strip Rolling Modelmentioning

confidence: 99%

MetaLub – a slab method software for the numerical simulation of mixed lubrication regime in cold strip rolling

Carretta

Boman

Stephany

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part J:

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A cold-rolling model taking into account mixed lubrication regime has been developed and included into a simulation software named MetaLub. The main objective is to enhance the performances of rolling mills from a lubrication point of view. It means that lubricant rheology but also roll diameters and roughness, etc. can be optimized to improve stability and efficiency of the rolling tool.The main features of MetaLub are briefly presented in this article. Then, two studies of the influence of rolling speed and negative forward slip are discussed. The obtained numerical results are presented and compared to some experimental data from literature and from ArcelorMittal facilities in order to validate the model and to show its capacity to understand and help to improve industrial rolling conditions.

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“…The second relies on hydrodynamic approaches. The solution for change in asperity geometry and corresponding oil film thickness at the edge is given by coupling the hydrodynamic and the mass flow equations with the mechanical model for deformation of asperities [7,8]. Indeed, oil is either carried down the roll-strip at the entry area or is squeezed out of the bite.…”

Section: Introductionmentioning

confidence: 99%

Local approach strategy to predicting final roughness in cold rolling of stainless steel strips

Deltombe

Belotserkovets

Dubar

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part J:

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Good surface finish is an important requirement for many stainless steel products essentially in terms of brightness. This article deals with an original numerical approach proposed in order to better control workpiece roughness during cold rolling. As a first step, to supply the numerical model, the blasted strip rheology is identified using an inverse finite element methodology based on Vickers indentations. As a second step, a fluid-structure strong coupling model is proposed to determine the flattening of steel strip asperities during the first passes of a cold rolling sequence. Fluid flowrate between each valley is solved using local Reynolds' equations. The volume of the lubricant trapped and its pressure are updated on the cold rolling model. At the same time, asperities are deformed from the entry to the exit to reach their final shape. Roughness sensitivity to the industrial process parameters, to the rheological parameters, and to the lubricant rheology is discussed.

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Improvement of an Iterative and Staggered Approach for a Model of Mixed-Lubrication in Cold Rolling

Cited by 5 publications

References 0 publications

Numerical Hybrid Fluid Structure Coupling: Application to Mixed Lubrication in Metal Forming

Numerical Hybrid Fluid Structure Coupling: Application to Mixed Lubrication in Metal Forming

MetaLub – a slab method software for the numerical simulation of mixed lubrication regime in cold strip rolling

Local approach strategy to predicting final roughness in cold rolling of stainless steel strips

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