Development of a mixed film lubrication model in cold rolling

Salimi, M.

doi:10.1016/j.jmatprotec.2006.04.049

Cited by 35 publications

(22 citation statements)

References 10 publications

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“…Most of models which considered lubrication have been developed under the assumption of steady flow of lubricant. [26][27][28] This assumption, however, is not appropriate for studying chatter.…”

Section: Introductionmentioning

confidence: 99%

Development of a Rolling Chatter Model Considering Unsteady Lubrication

2014

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Chatter, limiting the rolling speed for thin steel strips, has been identified as a serious limitation in increasing the efficiency of the cold rolling process. Many experimental investigations have led to the point that lubrication is one of the effective factors causing chatter. In this article, a new chatter model of the cold strip rolling with consideration of unsteady lubrication is proposed. The limiting shear stress concept and the variation of the lubricant viscosity with pressure are considered in this model. The results of the simulation are verified by comparing to experimental data. Also, a parametric study on the effect of some of the major parameters of rolling lubricant on the chatter critical speed is conducted. The results show that under the operating conditions of this paper, the limiting shear stress is an effective parameter.

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Section: Introductionmentioning

confidence: 99%

Development of a Rolling Chatter Model Considering Unsteady Lubrication

2014

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“…Chang and Wilson explored the mixed lubrication of rolling under low speed condition. Recently, a cold rolling model based on asperity flattening and von Mises homogenous deformation for mixed regime was developed, which can be used at high rolling speed and converges quickly . Huaping Xiao researched the contact ratio of rough surfaces with multiple asperities in mixed lubrication at high pressures.…”

Section: Introductionmentioning

confidence: 99%

Research of oil film thickness model and surface quality in cold rolling copper foil

et al. 2013

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Rolled copper foil is widely used in high frequency and speed transmission of fine line printed circuit board, because of its high strength, good toughness and high density. In this paper, a theoretical model for copper foil rolling in mixed lubrication regime was developed on the basis of the average volume flow model and asperity flattening model. A more accurate relation for the variation of the lubricant viscosity with pressure and temperature was considered. The cold rolled copper foil experiment was carried on with different viscosity of rolling oil and pass reduction. The effects of rolling oil viscosity and pass reduction on lubricant pressure, contact area ratio and film thickness ratio were studied. The calculation results agree well with the measured data from copper foil rolling experiment. For obtaining higher surface quality, the rolling oil viscosity is about 10 mm 2 /s, and the pass reduction is about 30%.

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“…The mixed lubrication regime has been widely studied, more particularly in the field of cold rolling [2][3]. Recent studies were based on a coupling between fluid mechanics equations and a flattening asperity model [4,5]. The total pressure at the roll-strip interface P is expressed as a function of the pressure at asperity tips Pa, the fluid pressure in the valley Pb and the real area of contact A: F = A.Pa + (1-A).Pb (1) The total force F is identified from equilibrium equations of the process.…”

Section: Introductionmentioning

confidence: 99%

Roughness prediction during cold rolling of stainless steel strip: fluid structure approach

et al. 2009

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The present paper deals with a sequential fluid structure strong 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 modelled in 2D (trapezoidal shape) forming valleys and plateaus. Fluid flow rate between each valley full of lubricant is solved using Reynolds equations. 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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Development of a mixed film lubrication model in cold rolling

Cited by 35 publications

References 10 publications

Development of a Rolling Chatter Model Considering Unsteady Lubrication

Development of a Rolling Chatter Model Considering Unsteady Lubrication

Research of oil film thickness model and surface quality in cold rolling copper foil

Roughness prediction during cold rolling of stainless steel strip: fluid structure approach

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