New approach for the prediction of stress free surface profile of a workpiece in rod rolling.

Lee, Youngseog; Choi, Seong-Soo

doi:10.2355/isijinternational.40.624

Cited by 25 publications

(19 citation statements)

References 5 publications

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“…The results obtained from this work have demonstrated that the analytic model 9) was of underlying experimental rationale to be used in rod mills which have the oval-round (or round-oval) pass rolling sequence. If the effect of rolling speed on the maximum spread of workpiece is known, this model might be industrially a very valuable tool for predicting the surface profile of exit cross section and area of workpiece from the viewpoint of computational time and convenience.…”

Section: Discussionmentioning

confidence: 91%

“…The aim of this work was to improve the predicting capability of the model 9) that predicts the surface profile of exit cross section of workpiece in the oval-round (or roundoval) pass rolling sequence and to examine the robustness and generality of the analytic model, to assess the potential that finite element method widely being used for predicting it might be replaced by this model. It should be noted that it is possible to predict the surface profile of exit cross section by using three-dimensional finite element method.…”

Section: Discussionmentioning

confidence: 99%

“…Derivation procedure for R f is described in detail in Ref. 9). Once R s is determined, the contact point (C x , C y ) can be obtained.…”

Section: Surface Profile In Round-oval Pass Rollingmentioning

confidence: 99%

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Prediction of the Surface Profile and Area of the Exit Cross Section of Workpiece in Round-Oval-Round Pass Sequence.

Lee

2002

ISIJ International

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In this paper, the model 9) that predicts the surface profile and area of exit cross section of workpiece in oval-round (or round-oval) pass rolling sequence has been improved. Afterward, the generality and robustness of the model was studied to assess the potential that finite element method generally used for predicting it might be replaced by the model. Since only the shape of the inlet cross-section of workpiece and geometry of the roll groove are considered in the model, the problem of obtaining the final rolled shape is greatly simplified and subsequently the computational time required for whole rolling process is a few seconds.Extensive hot bar rolling experiments at different temperatures (800-1 100°C) was carried out to investigate the effect of the change of rolling conditions and material parameters, such as the ratio of the specimen diameter to roll diameter, roll gap (i.e., pass height), roll groove design, steel grades and temperature of material on the model. This model has then been applied to a rod mill to extend its application coverage.It was shown that the predicted surface profile and area of exit cross section are in good agreement with those experimentally measured for the variation of rolling conditions and material parameters. It was found that if we are interested in the capability for predicting the surface profile and area of exit cross section of workpiece for the entire rod (or bar) rolling line within a very short time, the proposed model might be an alternative which can replace the three-dimensional finite element method usually used in the analysis of rod (or bar) rolling analysis.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

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Prediction of the Surface Profile and Area of the Exit Cross Section of Workpiece in Round-Oval-Round Pass Sequence.

Lee

2002

ISIJ International

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“…OALib Journal point on the contact boundary at the exit-section, and it can be determined by the reference [16] [17].…”

Section: /16mentioning

confidence: 99%

Novel Analytic Model for the Projected Contact Zone Based on the Flow Line Element Method in Alloyed Bar Rolling

Dong¹,

Hui²,

Song³

2017

OALib

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For obtaining the profile and the projected area of contact zone exactly during alloyed bar rolling by Round-Oval-Round pass sequence, the analytic model for the length contact and contact boundary curve were built firstly by considering the influence of the spread of the outgoing workpiece on the effective height of outgoing workpiece and roll mean radius, and then the contact surface was discretized by finite flow line elements. Moreover, the radius equation and bite angle equation of different flow lines were derived and they were all expressed as the function of the position angle, then any flow line on the contact surface can be determined since the position angle has been given. Finally, since the analytic equation for the projected area of contact surface was hard to be integrated directly, the analytic model was proposed by summing up the area of discretized parts on the contact surface. Based on the analytical model of contact boundary and flow line element, 3-dimension contact surface was rebuilt by mathematical software, and the validity of analytic model was examined by the bar rolling experiments and the numerical simulation of alloyed bar rolling by rigid-plastic FEM software. Compared with the existing models, the precision of the projecting area of contact zone was improved obviously. So, it can be applied in alloyed bar rolling to predict the projected area of contact zone and velocity of outgoing workpiece exactly.

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“…The formulation procedure of the surface profile prediction model and its experimental verification are described in the work of Lee and Choi. 4) Tables 1 and 2 show the mean roll radii calculated from the existing models (Eqs. (1) and (2)) and the analytical model (Eq.…”

Section: The Analytical Modelmentioning

confidence: 99%

An Analytical Study of Mean Roll Radius in Rod Rolling.

Lee

2001

ISIJ International

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New approach for the prediction of stress free surface profile of a workpiece in rod rolling.

Cited by 25 publications

References 5 publications

Prediction of the Surface Profile and Area of the Exit Cross Section of Workpiece in Round-Oval-Round Pass Sequence.

Prediction of the Surface Profile and Area of the Exit Cross Section of Workpiece in Round-Oval-Round Pass Sequence.

Novel Analytic Model for the Projected Contact Zone Based on the Flow Line Element Method in Alloyed Bar Rolling

An Analytical Study of Mean Roll Radius in Rod Rolling.

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