Analysis of asymmetrical sheet rolling by slab method

Zhang, S.H.; Zhao, Dewen; Gao, Changqing; Wang, G.D.

doi:10.1016/j.ijmecsci.2012.09.015

Cited by 54 publications

(21 citation statements)

References 21 publications

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“…For a rolling process, the contact response is complex because the blank is an elastic-plastic part, and the roller is an elastic part if ignoring the small plastic deformation. The slab method is essential way for analyzing the contact and deformation of rolling process [13][14][15]. It is generally believed that the rolling bite, that is, the rolling contact area, can be divided into the forward slip zone and backward slip zone, as illustrated in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on Contact Condition and Wear of Roller in Cold Rolling

Jin

Wang

Jiang

et al. 2017

Metals

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An accurate determination of the contact pressure and local sliding in a cold rolling process is an essential step towards the prediction of the roller's life due to wear damage. This investigation utilized finite element analysis to quantify the local contact pressure and local sliding over the rolling bite in a plate cold rolling process. It was the first study to quantify the local sliding distance in a rolling process using the Finite Element Analysis (FEA). The numerical results indicate that the local contact pressure over the rolling bite demonstrates a hill profile, and the peak coincides with the neutral plane. The local sliding distance over the rolling bite demonstrates a double-peak profile with the two peaks appearing at the forward slip and backward slip zones respectively. The amplitude of sliding distance in the backward slip zone is larger than that in the forward slip zone. A stick zone was confirmed between the forward slip and backward slip zones. According to a parametric study, the local contact pressure and sliding distance decrease when the thickness reduction is reduced or the diameter of the roller is decreased. The location of the neutral plane always presents at the rolling exit side of the rolling bite's center. The size of the stick zone enlarges and the sizes of slip zones shrink significantly when the friction coefficient is increased. Finally, a novel concept of wear intensity was defined to examine the wear of the roller based on the local contact pressure and local sliding distance. The results show that a two-peak wear response exists in the backward and forward slip zones. The magnitude of the wear in the backward slip zone is larger than that in the forward slip zone. For a given roller and blank material combination, using a smaller thickness reduction, a smaller diameter roller and a higher friction coefficient condition can reduce the wear of the roller for a single rolling cycle. The current paper develops an understanding of rolling contact responses to the wear of the roller in rolling process. The research method can also be applied to study other rolling or sliding wear problems.

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Section: Introductionmentioning

confidence: 99%

A Numerical Study on Contact Condition and Wear of Roller in Cold Rolling

Jin

Wang

Jiang

et al. 2017

Metals

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“…A larger difference between the velocity of the upper and lower work roller contributes to a greater reduction of the rolling force [18][19][20][21][22]. At the same time, the speed difference results in the creation of a larger shear deformation area, which appears as a consequence of the changed position of the neutral points in the deformation zone [23,24]. On the other hand, a negative consequence of asymmetric rolling is the bending of the workpiece, more often known as the "ski effect" [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Texture Evolution with Relation to Mechanical Properties of Compared Symmetrically and Asymmetrically Cold Rolled Aluminum Alloy

Kraner

Fajfar

Palkowski

et al. 2020

Metals

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The impact of asymmetric cold rolling was quantitatively assessed for an industrial aluminum alloy AA 5454. The asymmetric rolling resulted in lower rolling forces and higher strains compared to conventional symmetric rolling. In order to demonstrate the positive effect on the mechanical properties with asymmetric rolling, tensile tests, plastic-strain-ratio tests and hardness measurements were conducted. The improvements to the microstructure and the texture were observed with a light and scanning electron microscope; the latter making use of electron-backscatter diffraction. The result of the asymmetric rolling was a much lower planar anisotropy and a more homogeneous metal sheet with finer grains after annealing to the soft condition. The increased isotropy of the deformed and annealed aluminum sheet is a product of the texture heterogeneity and reduced volume fractions of separate texture components.

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“…In the earlier study, the slab method is mainly used in the flat rolling. [12][13][14] Hwang and Tzou 15 proposed the slab method to establish analytical models for asymmetrical hot strip rolling and then studied asymmetrical cold rolling of clad sheet, assuming even normal stress and Coulomb friction. 16 Salimi and Kadkhodaei 17 used slab method to study asymmetrical sheet rolling process considering uneven normal and shear stresses, and friction shear stress was considered in evaluating the yield condition.…”

Section: Introductionmentioning

confidence: 99%

“…Qwamizadeh et al 18 presented an analytical model to research asymmetrical rolling of bonded two-layer sheets, in which uneven normal and shear stresses acting on the vertical sides were supposed. Zhang et al 12 established slab model of the asymmetrical sheet rolling to evaluate the rolling force. In the solution, the shear stresses acting on the vertical sides were supposed.…”

Section: Introductionmentioning

confidence: 99%

A fast calculation method of large-cylinder asymmetrical rolling force considering shear effect

Chen

et al. 2019

Advances in Mechanical Engineering

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An analytical model for large-cylinder asymmetrical rolling is proposed based on an improved slab method, which can predict the rolling force more quickly. In this method, uneven normal and shear stresses acting on the vertical side are supposed. In the solution, the upper and lower contact lengths are different, and the roll gap is divided into four slabs. Moreover, the effects of the rolling parameters such as roll speed ratio, roll radius, exit thickness, and radius of cylinder on the rolling force and cross-shear zone ratio are investigated. The cross-shear zone ratio, which means the shear effect, is a key parameter in reducing rolling force and microstructure refinement. This method is conducted with the experimental and finite element verification, and good agreement has been found. It should be noted that the calculation result can be obtained rapidly and easily by this proposed model. Therefore, the present model is suitable for online application.

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Analysis of asymmetrical sheet rolling by slab method

Cited by 54 publications

References 21 publications

A Numerical Study on Contact Condition and Wear of Roller in Cold Rolling

A Numerical Study on Contact Condition and Wear of Roller in Cold Rolling

Microstructure and Texture Evolution with Relation to Mechanical Properties of Compared Symmetrically and Asymmetrically Cold Rolled Aluminum Alloy

A fast calculation method of large-cylinder asymmetrical rolling force considering shear effect

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