A simplified method to calculate the rolling force in hot rolling

Si, Li; Wang, Zhigang; Liu, Changming; Ruan, Jinhua; Xu, Zengbing

doi:10.1007/s00170-016-8890-z

Cited by 25 publications

(16 citation statements)

References 25 publications

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“…In hot rolling, material plastic flow is akin to viscous flow in the deformation zones . Basing on the Navier–Stokes equation (N‐S equation) in viscous fluid dynamics, the geometric correction factor was introduced in this paper to simplify calculation formulas, determine the velocity distribution of material flow and the contact stresses of the viscous body.…”

Section: Introductionmentioning

confidence: 99%

“…In hot rolling, material plastic flow is akin to viscous flow in the deformation zones. [10,11] Basing on the Navier-Stokes equation (N-S equation) in viscous fluid dynamics, the geometric correction factor was introduced in this paper to simplify calculation formulas, determine the velocity distribution of material flow and the contact stresses of the viscous body. Through comparison of the experimental data with the theoretical results predicted by HM, ACM and AFM in hot rolling, it can be found that the contact stresses formula derived by HM could smooth the friction hill, and had higher accuracy prediction of the contact stresses around the neutral plane than those predicted by ACM and AFM.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics Method and Its Application in Hot Strip Rolling

Wang

Ruan

et al. 2016

steel research int.

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A hydrodynamics method (HM) has been developed to predict the contact stresses in hot strip rolling. This method is based on that materials deformed in hot rolling present properties of viscous fluid. The contact stress formulas are derived from Navier–Stokes equation (N‐S equation) by using HM. The contact stresses predicted by these formulas agreed well with the experiment data, which verified the validity of these formulas. By comparisons of experiment data with the results predicted by the derived formulas, the Amontons–Coulomb friction model (ACM) and the Absolute constant friction model (AFM), it is found that formulas derived by HM can smooth the friction hill and has higher accuracy in predicting the neutral plane positon than the ACM and the AFM did. It is believed that the contact stress formulas derived by HM can be used to solve on line hot rolling problems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrodynamics Method and Its Application in Hot Strip Rolling

Wang

Ruan

et al. 2016

steel research int.

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“…These similarities were confirmed by experiments in [31]. The capability of more accurate roll force prediction compared to Sims' model is discussed in [29,31].…”

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confidence: 61%

“…One of the most promising is the hydrodynamic roll gap model. It was first proposed by Kneschke [28] and has recently received more attention (see, e.g., [29,30]). Due to similarities of the material behavior of rolled products and viscous fluids, fluid mechanics theory is used to describe the deformation process.…”

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confidence: 99%

Asymmetric hydrodynamic roll gap model and its experimental validation

Müller

Steinboeck

Prinz

et al. 2018

Int J Adv Manuf Technol

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In tandem hot strip rolling mills, different friction between the rolls and the strip material on the upper and lower strip surface can occur due to asymmetric surface temperatures or different conditions of oil lubrication. To capture these effects, this paper presents a hydrodynamic roll gap model with asymmetric friction. Based on similarities between the rolled material and viscous fluids, fluid mechanics theory is used to derive this model. Due to the nature of this model, the influence of the rolling speed is inherently taken into account, which allows an accurate prediction of the rolling force and the forward slip. As an analytic solution for the hydrodynamic roll gap model is available, it is well suited for online applications in rolling plants. For validation of the proposed model, an experiment with asymmetric work roll roughness was performed. A specimen of steel strip with copper pins inserted was repeatedly rolled to visualize the material flow inside the roll gap for multiple passes. The resulting deformed copper pins were cut out of the strip and show good agreement with the deformation profiles calculated by the developed model.

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“…In order to achieve higher-quality product on strip rolling mills, it is necessary to accurately predict the contact stresses in roll gap. A lot of theoretical friction models [1][2][3][4][5] had been proposed to predict the contact stresses in roll gap. Due to oversimplification of the frictional conditions in complex plastic deformation process, theoretical prediction in distribution of the contact stresses over the contact arc has never been satisfactorily achieved.…”

Section: Introductionmentioning

confidence: 99%

An improved inverse method by envelope fitting for prediction of contact stresses in strip rolling

Wang

Xiao

et al. 2017

J Braz. Soc. Mech. Sci. Eng.

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An improved inverse method by envelope fitting approach has been developed to improve prediction accuracy of contact stresses in strip rolling. By comparisons of the simulation data with theoretical results predicted by different inverse methods, it can be found that the improved inverse method by envelope fitting has a better predictive effect than the old method, in particular for the friction stress. And then, a rolling experiment is developed to validate the industrial feasibility of the improved inverse method. Comparing the results predicted by FEM and different inverse methods, it is also demonstrated that the improved inverse method is better than the old method in the rolling test. It is believed that the improved inverse method by envelope fitting approach would have great potential for industrial rolling.

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A simplified method to calculate the rolling force in hot rolling

Cited by 25 publications

References 25 publications

Hydrodynamics Method and Its Application in Hot Strip Rolling

Hydrodynamics Method and Its Application in Hot Strip Rolling

Asymmetric hydrodynamic roll gap model and its experimental validation

An improved inverse method by envelope fitting for prediction of contact stresses in strip rolling

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