An experimental investigation into roughness transfer in skin-pass rolling of steel strips

Çolak, Bilal; Kurgan, Naci

doi:10.1007/s00170-018-1691-9

Cited by 28 publications

(43 citation statements)

References 13 publications

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“…The rolling force acting on DC04 grade sheet material increases with the rise in the reduction ratio. The results obtained by Çolak and Kurgan (2018) are consistent with these results. This situation was observed in two different thicknesses (1 and 1.5 mm) test samples of DC04 grade sheet material as shown in Figure 3(a).…”

Section: Resultssupporting

confidence: 89%

“…However, too high roughness causes the material surface to appear matte. Numerous peaks increase paintability but reduce formability (Elkoca, 2008; Çolak and Kurgan, 2018). Therefore, the surface should have roughness and the number of peaks in a definite and narrow range.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, they determined that the ED (Electrical discharged dull) roll provides a better roughness transfer than the SD (Shot dull) roll. Çolak and Kurgan (2018) stated that the parameters increasing the rolling force increased the roughness transfer and, when using lubricant, the roughness transfer decreased according to the dry rolling conditions. Lenard (2004) researched the effect of roll surface roughness to rolling force and reported that the decrease of roll roughness would lead to low loads and high roll roughness increased roughness of the sheet material.…”

Section: Introductionmentioning

confidence: 99%

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Effect of material thickness and reduction ratio on roughness transfer in skin-pass rolling to DC04 grade sheet materials

Özakın

Çolak

Kurgan

2021

ILT

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Purpose The last stage of the cold rolling process is skin-pass rolling and one of its most significant goals is to obtain appropriate topography on the surface of the sheet steel used extensively such as in automotive industry. The purpose of this paper is to investigate the effect of thickness change and various reduction ratios on roughness transfer of DC04 grade sheet material. Design/methodology/approach DC04 grade sheet materials with different reduction ratios and several thicknesses were subjected to skin-pass rolling process in the rolling equipment with a two-high roll. Some roughness parameters were determined as a result of roughness measurements from the surfaces of roughened sheet materials. Findings While the roughness transfer is higher in 1-mm thick material in reduction ratios up to 430 micrometers; in reduction ratios above 430 micrometers, it is higher for 1.5-mm thick materials. As the reduction ratio increases in DC04 grade sheet materials, the homogeneity of the roughness distribution in 1-mm thickness sheet material deteriorates, while the roughness distribution in 1.5-mm thickness sheet material is more homogeneous. Originality/value This paper demonstrates how material thickness and reduction ratio affect the roughness transfer in skin-pass rolling. The results obtained can be used by optimizing in manufacturing processes.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of material thickness and reduction ratio on roughness transfer in skin-pass rolling to DC04 grade sheet materials

Özakın

Çolak

Kurgan

2021

ILT

Self Cite

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“…Ref. [7] also indicates that roughness transfer is expected to be higher in thinner material. However, there cannot be a direct comparison between thick gauge results and thin gauge results here since the total rolling force as well as reduction are different (e.g., 7.495% reduction for thick gauge vs. 1.075% for thin gauge).…”

Section: Contact Interferencementioning

confidence: 96%

Influence of work-roll grinding error and high-fidelity corrective grinding in cold sheet rolling

Patel

Malik

Zhang

et al. 2022

Int J Adv Manuf Technol

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High-fidelity flatness defects in cold-rolled strip and sheet, arising from highly-localized thickness strain variations, present an ongoing challenge to the metals industry. A primary cause of such defects, based on rolling practice, but for which the effects have not been rigorously investigated, is the transfer of localized work-roll diameter deviations due to roll grinding error. This study addresses high-fidelity work-roll diameter deviation transfer in the cold rolling of stainless steel, aluminum, and copper. Parametric studies are performed on a 4-high mill to examine the influences of roll diameter, reduction, strip width, and material on the transfer of high-fidelity work roll diameter deviations. Studies are conducted using an efficient 3D roll-stack model that predicts strip thickness profile deviations via the simplified-mixed finite element method. Reduction deviations on the outgoing strip, which correlate to strip flatness/shape defects, are quantified and analyzed to understand the transfer characteristics of work-roll grinding deviations relative to perfectly ground (smooth) work rolls. The results reveal that high-fidelity transfer depends not only on roll grinding deviation amplitudes and mill loading, but also on the specific locations of deviations along the roll face length due to 3D bulk roll-stack deformations as well as effective stiffness ratio between the work roll and the strip. Concluding the study is a novel approach to identify customized work roll grinding profiles tailored specifically to eliminate pre-existing high-fidelity strip flatness defect patterns, wherein "corrective" high-fidelity roll diameter profiles account for the predicted 3D mill deflections, contact force distributions, and coupled micro/macro scale deformation mechanics.

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“…Ahmed [ 19 ] used a three-dimensional contour measurement method for identifying the surface features of cold rolled stainless steel strips for tracking the evolution of pits and roll marks and analyzed how deep pits quickly disappeared and transformed into shallow pits. Bilal [ 20 ] and Qu [ 21 ] studied the effects of different rolling speeds, reduction rate, lubrication conditions and rolling pressure on rolling transfer efficiency through skin-pass rolling experiments, and obtained the law that the surface roughness and roughness distribution range increase with the increase of reduction rate. Heng [ 22 ] investigated changes in microstructure and surface topography of IF steel using electron backscatter diffraction and optical interferometric microscopy.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation of Steel Surface Topography Transfer by Cold Rolling

Yang

Wang

et al. 2020

Micromachines

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Automobile and household appliance panels require steel strips with extremely high-quality surfaces. Therefore, an in-depth study of the surface topography transfer of the steel strip during the rolling process is of considerable significance for improving product quality. In this study, the scale-invariant feature transform (SIFT) algorithm is used to realize the large-field stitching and the correspondence measurement of the surface topography of the roll and strip. The surface topography transfer mechanism and microconvex change law during cold rolling are revealed. Further analysis is conducted regarding the effects of different reduction rates and the initial surface topography of the roll on the formation of strip surface topography. Experimental results reveal that the furrow phenomenon occurs during the rolling process owing to the backward slip effect but is eliminated by the elastoplastic deformation of the matrix and the forward slip action. No furrow occurred along the width direction of the strip. With an increase in the rolling reduction rate, the transfer rate increases, and the strip surface topography is closer to the roll surface topography. Under the same rolling roughness condition and a small reduction rate (5%), the transfer degree increases remarkably with a rise in the reduction rate and increases slowly as the reduction rate continues to grow (from 7% to 10%). This study serves as a theoretical basis for the subsequent improvement of the surface quality of cold rolled strips.

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An experimental investigation into roughness transfer in skin-pass rolling of steel strips

Cited by 28 publications

References 13 publications

Effect of material thickness and reduction ratio on roughness transfer in skin-pass rolling to DC04 grade sheet materials

Effect of material thickness and reduction ratio on roughness transfer in skin-pass rolling to DC04 grade sheet materials

Influence of work-roll grinding error and high-fidelity corrective grinding in cold sheet rolling

An Experimental Investigation of Steel Surface Topography Transfer by Cold Rolling

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