Experimental Study of Roll Flattening in Cold Rolling Process

Li, Ling; Matsumoto, Ryo; Utsunomiya, Hiroshi

doi:10.2355/isijinternational.isijint-2017-623

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…Based on the comparison of the shape change of the flattened wire with R h , a higher friction coefficient was necessary to more accurately predict the shape change of the flat-rolled wire because it is known that the lateral spreading of the flat-rolled wire increases with the friction coefficient [25]. In addition, roll flattening also affected the wire shape because the elastic deformation of rolls becomes larger and more important as the strength of the workpiece increases [26]. That is, the effective roll diameter increases during the cold rolling process owing to the roll flattening.…”

Section: Model Validationmentioning

confidence: 99%

Influence of Roll Diameter on Material Deformation and Properties during Wire Flat Rolling

Hwang

Kim

2021

Applied Sciences

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The influence of roll diameter on the strain distribution, shape change, contact pressure, and damage value of a workpiece was investigated during wire flat rolling to control the material properties of the flattened wire. The flattened wires fabricated by the four different rolls were compared using finite element analysis. The strain inhomogeneity of the flat-rolled wire increased with the roll diameter; thus, the macroscopic shear bands were strengthened as the roll diameter increased during wire flat rolling. The contact width and lateral spreading of the flattened wire increased with the roll diameter; therefore, the reduction in area decreased with the roll diameter. The contour of the normal contact pressure on the wire surface exhibited a similar pattern regardless of the roll diameter. The contact pressure showed higher values at the entry, edge, and exit zones in the contact area. The distribution of the damage value varied with the roll diameter. The free surface region tended to have the peak damage value during the process; however, the center region exhibited the maximum damage value with the roll diameter. From the perspective of the damage value, the optimum roll diameter was in existence during wire flat rolling. The underlying cause of the different strain distributions, shape changes, and damage values of the flat-rolled wire was the different contact lengths originating from the different roll diameters during wire flat rolling.

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Section: Model Validationmentioning

confidence: 99%

Influence of Roll Diameter on Material Deformation and Properties during Wire Flat Rolling

Hwang

Kim

2021

Applied Sciences

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“…To prove the above assumption, it is interesting to investigate the relationship between curvature and ratio of contact lengths L L /L U on the lower and upper profiles because shape factors of upper and lower interfaces should be different in asymmetric rolling. In the previous study, the authors 12) measured the profile of the partly rolled sheet during interrupted rolling. Therefore, it is possible to measure the contact lengths on the upper and lower profiles separately.…”

Section: Curling Of Sheet In Asymmetric Rolling Investigated By Profimentioning

confidence: 99%

Curling of Sheet in Asymmetric Rolling Investigated by Profile Measurement of Partly Rolled Sheet

Matsumoto

Utsunomiya

2019

ISIJ Int.

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“…where μ -Friction coefficient; μ h -Friction coefficient of hydrodynamic lubrication; μ b -Friction coefficient of boundary lubrication; β -Attenuation index of friction coefficient (μm −1 ). Subsequently, on the basis of rolling theory, 12,13) the bite angle, forward slip, rolling force, and the rolling power of double cold rolling can be obtained using Eq. 8.…”

Section: Friction Coefficient Bite Angle Forward Slip Rolling Forcmentioning

confidence: 99%

Comprehensive Optimization Control Technology of Rolling Energy and Oil Consumption in Double Cold Rolling

et al. 2019

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In double cold rolling process, rolling energy and oil consumption is normally controlled separately, thereby causing a high comprehensive cost. This study investigated a calculation model of plate-out oil film thickness on strip surface, oil film thickness in deformation zone, friction coefficient, bite angle, forward slip, rolling force, rolling power, rolling energy consumption, and rolling oil consumption. Subsequently, the effect of emulsion flow and concentration on rolling energy and oil consumption comprehensive cost was quantitatively analyzed. On this basis, an objective function of rolling energy and oil consumption comprehensive cost was proposed, and the corresponding comprehensive optimization control technology for rolling energy and oil consumption was developed. Through a field application of this technology, the reduction of rolling energy and oil comprehensive consumption cost was achieved by optimizing emulsion flow and concentration comprehensively. Thus, a significant economic benefit was created with further popularization and application values.

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Experimental Study of Roll Flattening in Cold Rolling Process

Cited by 7 publications

References 9 publications

Influence of Roll Diameter on Material Deformation and Properties during Wire Flat Rolling

Influence of Roll Diameter on Material Deformation and Properties during Wire Flat Rolling

Curling of Sheet in Asymmetric Rolling Investigated by Profile Measurement of Partly Rolled Sheet

Comprehensive Optimization Control Technology of Rolling Energy and Oil Consumption in Double Cold Rolling

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