The Experts below are selected from a list of 2637 Experts worldwide ranked by ideXlab platform
Hideo Kijima - One of the best experts on this subject based on the ideXlab platform.
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influence of Roll Radius on roughness transfer in skin pass Rolling of steel strip
Journal of Materials Processing Technology, 2014Co-Authors: Hideo KijimaAbstract:Abstract Skin-pass Rolling (or temper Rolling) is usually the final process in the production of cold-Rolled steel sheets. One of the main objectives in skin-pass Rolling is to obtain a certain surface roughness profile. Although a large Roll Radius compared to the contact length and the reduction in thickness is one of the characteristics of skin-pass Rolling conditions, numerous studies have been conducted thus far using laboratory mills with small Radius Rolls. In this paper, the influence of Roll Radius on roughness transfer in skin-pass Rolling is investigated by experimental Rolling tests as well as numerical analysis by elastic–plastic FEM. A simple but useful method of estimating roughness transfer is suggested. It was found that some characteristics of skin-pass Rolling related to roughened Rolls are not properly simulated using small Radius Rolls.
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influence of Roll Radius on contact condition and material deformation in skin pass Rolling of steel strip
Journal of Materials Processing Technology, 2013Co-Authors: Hideo KijimaAbstract:Abstract Skin-pass Rolling (or temper Rolling) is the final forming step in the production of cold Rolled steel sheets. Although a large Roll Radius compared to the contact length is one of the characteristics of skin-pass Rolling conditions, numerous studies have been conducted thus far using laboratory mills with small Radius Rolls. In this paper, the influence of Roll Radius on the contact condition and material deformation in skin-pass Rolling is examined and clarified by numerical analysis by an elastic–plastic FEM analysis as well as experimental Rolling tests, which were performed to verify the result of the analysis. Some characteristics of skin-pass Rolling related to pressure distribution, contact condition and material deformation are not properly simulated using small Radius Rolls. Considering characteristic skin-pass Rolling conditions, two cases using simplified models, i.e., vertical compression and Rolling with a circular, rigid Roll, were analyzed.
Jianfeng Song - One of the best experts on this subject based on the ideXlab platform.
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a research on the forward slip coefficient in alloyed bar Rolling by the round oval round pass sequence
Advanced Materials Research, 2011Co-Authors: Jianfeng Song, Yonggang DongAbstract:For predicting the forward slip coefficient and veocity of outgoing workpiece exactly during alloyed bar Rolling by Round-Oval-Round pass sequence, the influence of the spred of the outgoing workpiece and its contact boundary condition was considered and the calculating formula for the effective height of outgoing workpiece and the mean Roll Radius was proposed individually. Moreover, the new parameters were substituted into the Shinokura and Takai Formula to modify it. Then a modified forward slip coefficient firmula was proposed. The validity of the theoretical model has been examined by the bar Rolling experiment and the numerical simulation using three-dimensional rigid-plastic FEM. Compared with the Shinokura and Takai dormula, the predict accuracy of the modified formula was improved apparently. So, it can be applied in alloyed bar Rolling to predict the the forward slip coefficient and veocity of outgoing workpiece exactly.
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an analytical model for the prediction of cross section profile and mean Roll Radius in alloy bar Rolling
Journal of University of Science and Technology Beijing Mineral Metallurgy Material, 2008Co-Authors: Yonggang Dong, Wenzhi Zhang, Jianfeng SongAbstract:Abstract In a round-oval-round pass Rolling sequence, the cross-section profile of an outgoing workpiece was predicted first after getting the maximum spread. The concept “critical point on the contact boundary” was proposed and the coordinates of the critical point were solved. The equivalent contact section area was represented and the mean Roll Radius was determined. The validity of this model was examined by alloy bar Rolling experiment and rigid-plastic FEM simulation. Compared with the existing models, the mean Roll Radius obtained by this model is similar to experiment data.
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an analytical model for the prediction of cross section profile and mean Roll Radius in alloy bar Rolling
Journal of University of Science and Technology Beijing Mineral Metallurgy Material, 2008Co-Authors: Yonggang Dong, Wenzhi Zhang, Jianfeng SongAbstract:Abstract In a round-oval-round pass Rolling sequence, the cross-section profile of an outgoing workpiece was predicted first after getting the maximum spread. The concept “critical point on the contact boundary” was proposed and the coordinates of the critical point were solved. The equivalent contact section area was represented and the mean Roll Radius was determined. The validity of this model was examined by alloy bar Rolling experiment and rigid-plastic FEM simulation. Compared with the existing models, the mean Roll Radius obtained by this model is similar to experiment data.
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a novel approach for the prediction of surface profile of outgoing workpiece and the calculation of mean Roll Radius in alloy bar Rolling
Acta Metallurgica Sinica (english Letters), 2007Co-Authors: Yonggang Dong, Wenzhi Zhang, Jianfeng SongAbstract:In alloy bar Rolling process, the component of alloyed steel influenced the spread coefficient greatly, therefore, the component influence coefficient m of different alloyed steel has been determined firstly to calculate the maximum spread. Then the curvature Radius of stress free surface and the “critical point on the contact boundary” have been solved, the surface profile of outgoing workpiece has been obtained. Furthermore, the formula of the equivalent contact section area has been proposed and the mean Roll Radius has been calculated. The bar Rolling experiment and the rigid-plastic FEM (finite element method) simulation have been carried out to verify the novel approach. Compared with experimental data and simulation results, the novel approach can be used in setting processing parameter and design of finishing groove.
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a new analytical model for the calculation of mean Roll Radius in round oval round alloy bar Rolling
Isij International, 2006Co-Authors: Yonggang Dong, Wenzhi Zhang, Jianfeng SongAbstract:In rod (or bar) Rolling process, the Roll surface is not flat for the groove on the Roll, so the Roll Radius is not constant along the Roll axis direction. In this paper, a suitable spread formula was determined to calculate the maximum spread of alloyed steel, then the surface profile of outgoing workpiece and the critical point on the contact boundary has been predicted. Furthermore, the formula of the equivalent contact section area has been proposed and the mean Roll Radius has been obtained.The validity of the new model has been examined by the bar Rolling experiment and the rigid-plastic FEM simulation. Compared with the existing models, the mean Roll Radius obtained by the new analytical model approach the experiment data more closer than other models. So, it can be used as a available reference in practice and the theoretical derivation.
Dianhua Zhang - One of the best experts on this subject based on the ideXlab platform.
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a novel approach for the edge Rolling force and dog bone shape by combination of slip line and exponent velocity field
SN Applied Sciences, 2020Co-Authors: Yufeng Zhang, De-wen Zhao, Wen Peng, Dianhua ZhangAbstract:This study presents a new mathematical model for edge Rolling force and dog-bone shape using the combination of slip-line and exponent velocity field. The slip-line field of the dog-bone area is drawn out based on the deformation characteristics of edge Rolling and the maximal depth of dog-bone zone is determined. Then a new exponent velocity field and corresponding strain rate field which satisfy kinematically admissible condition are proposed to analyze the edge Rolling force based on upper bound approach. The upper bound solutions of dog-bone shape and Rolling force are obtained by minimizing the total power which contains the internal plastic power, frictional and shear powers. The effects of reduction rate, initial thickness and Roll Radius on dog-bone shape size and edge Rolling force are discussed. The results obtained by the combined solution in this paper are compared with measured data in strip hot Rolling field and finite element method (FEM) simulation results, and a good agreement is found.
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upper bound analysis of Rolling force and dog bone shape via sine function model in vertical Rolling
Journal of Materials Processing Technology, 2015Co-Authors: Dianhua ZhangAbstract:Abstract The control of the slab width in actual production is realized by the widely use of vertical Rolling (edge Rolling). According to the incompressibility condition, the sine function dog-bone model is firstly proposed in this paper for steady state deformation in vertical Rolling with flat Rolls combined with the actual conditions. Based on the first variation principle of rigid-plastic material, the variable upper bound integration method is used to integrate plastic deformation, shear and friction power terms. The upper bound solutions of Rolling force and dog-bone shape are solved numerically, and this process is carried out using Matlab Optimization Toolbox by minimizing the total power functional. Results show that the Rolling force increases and the dog-bone shape size become larger while engineering strain, initial thickness, or Roll Radius increases. The results obtained from sine function model are compared with those of experimental data in reference and FEM simulation, and a good agreement is found. The comparison shows that it is possible to determine the required optimum Rolling force and dog-bone shape by using sine function model.
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simplified weighted velocity field for prediction of hot strip Rolling force by taking into account flattening of Rolls
Journal of Iron and Steel Research International, 2014Co-Authors: Dianhua Zhang, Jianzhao Cao, X U Jiujing, Wen Peng, De-wen ZhaoAbstract:Abstract The weighted velocity field was simplified for analysis of hot strip Rolling. Using the field and GM (geometric midline) yield criterion, the deformation power, friction power and shear power were obtained respectively. Summing the partial power contributions, the total deformation power for strip Rolling was presented. Then, by minimizing the power function, the Rolling force was obtained; meanwhile, considering the effect of Roll elastic flattening, iterative calculation of the Roll Radius was carried out until the Radius was convergent. On-line data were compared with the calculated results to verify the model accuracy. It was indicated that the calculated Rolling forces were basically in agreement with the measured ones since the maximum error was less than 10.0%. Moreover, the effects of various Rolling conditions such as thickness reduction, friction factor and shape factor, upon separating force, location of neutral angle, and stress state coefficient were discussed systematically.
Yonggang Dong - One of the best experts on this subject based on the ideXlab platform.
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a research on the forward slip coefficient in alloyed bar Rolling by the round oval round pass sequence
Advanced Materials Research, 2011Co-Authors: Jianfeng Song, Yonggang DongAbstract:For predicting the forward slip coefficient and veocity of outgoing workpiece exactly during alloyed bar Rolling by Round-Oval-Round pass sequence, the influence of the spred of the outgoing workpiece and its contact boundary condition was considered and the calculating formula for the effective height of outgoing workpiece and the mean Roll Radius was proposed individually. Moreover, the new parameters were substituted into the Shinokura and Takai Formula to modify it. Then a modified forward slip coefficient firmula was proposed. The validity of the theoretical model has been examined by the bar Rolling experiment and the numerical simulation using three-dimensional rigid-plastic FEM. Compared with the Shinokura and Takai dormula, the predict accuracy of the modified formula was improved apparently. So, it can be applied in alloyed bar Rolling to predict the the forward slip coefficient and veocity of outgoing workpiece exactly.
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an analytical model for the prediction of cross section profile and mean Roll Radius in alloy bar Rolling
Journal of University of Science and Technology Beijing Mineral Metallurgy Material, 2008Co-Authors: Yonggang Dong, Wenzhi Zhang, Jianfeng SongAbstract:Abstract In a round-oval-round pass Rolling sequence, the cross-section profile of an outgoing workpiece was predicted first after getting the maximum spread. The concept “critical point on the contact boundary” was proposed and the coordinates of the critical point were solved. The equivalent contact section area was represented and the mean Roll Radius was determined. The validity of this model was examined by alloy bar Rolling experiment and rigid-plastic FEM simulation. Compared with the existing models, the mean Roll Radius obtained by this model is similar to experiment data.
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an analytical model for the prediction of cross section profile and mean Roll Radius in alloy bar Rolling
Journal of University of Science and Technology Beijing Mineral Metallurgy Material, 2008Co-Authors: Yonggang Dong, Wenzhi Zhang, Jianfeng SongAbstract:Abstract In a round-oval-round pass Rolling sequence, the cross-section profile of an outgoing workpiece was predicted first after getting the maximum spread. The concept “critical point on the contact boundary” was proposed and the coordinates of the critical point were solved. The equivalent contact section area was represented and the mean Roll Radius was determined. The validity of this model was examined by alloy bar Rolling experiment and rigid-plastic FEM simulation. Compared with the existing models, the mean Roll Radius obtained by this model is similar to experiment data.
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a novel approach for the prediction of surface profile of outgoing workpiece and the calculation of mean Roll Radius in alloy bar Rolling
Acta Metallurgica Sinica (english Letters), 2007Co-Authors: Yonggang Dong, Wenzhi Zhang, Jianfeng SongAbstract:In alloy bar Rolling process, the component of alloyed steel influenced the spread coefficient greatly, therefore, the component influence coefficient m of different alloyed steel has been determined firstly to calculate the maximum spread. Then the curvature Radius of stress free surface and the “critical point on the contact boundary” have been solved, the surface profile of outgoing workpiece has been obtained. Furthermore, the formula of the equivalent contact section area has been proposed and the mean Roll Radius has been calculated. The bar Rolling experiment and the rigid-plastic FEM (finite element method) simulation have been carried out to verify the novel approach. Compared with experimental data and simulation results, the novel approach can be used in setting processing parameter and design of finishing groove.
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a new analytical model for the calculation of mean Roll Radius in round oval round alloy bar Rolling
Isij International, 2006Co-Authors: Yonggang Dong, Wenzhi Zhang, Jianfeng SongAbstract:In rod (or bar) Rolling process, the Roll surface is not flat for the groove on the Roll, so the Roll Radius is not constant along the Roll axis direction. In this paper, a suitable spread formula was determined to calculate the maximum spread of alloyed steel, then the surface profile of outgoing workpiece and the critical point on the contact boundary has been predicted. Furthermore, the formula of the equivalent contact section area has been proposed and the mean Roll Radius has been obtained.The validity of the new model has been examined by the bar Rolling experiment and the rigid-plastic FEM simulation. Compared with the existing models, the mean Roll Radius obtained by the new analytical model approach the experiment data more closer than other models. So, it can be used as a available reference in practice and the theoretical derivation.
Zhang Wenzhi - One of the best experts on this subject based on the ideXlab platform.
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a new analytical model for the calculation of mean Roll Radius in round oval round alloy bar Rolling
Journal of Plasticity Engineering, 2007Co-Authors: Zhang WenzhiAbstract:In alloy bar Rolling by Round-Oval-Round pass sequence ,the surface profile of outgoing workpiece has been predicted firstly after getting the maximum spread,then the critical point has been determined.Furthermore,the formula of the equivalent contact section area has been proposed and the mean Roll Radius has been calculated.The validity of the new model has been examined by the bar Rolling experiment and the rigid-plastic FEM simulation.Compared with the existing models,the mean Roll Radius obtained by the new analytical model approaches the experimental data more closer than other models.So,it can be used as an available reference in practice and the theoretical derivation.
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a new analytical model for the calculation of mean Roll Radius in round oval round alloy bar Rolling
Journal of Plasticity Engineering, 2007Co-Authors: Zhang WenzhiAbstract:In alloy bar Rolling by Round-Oval-Round pass sequence ,the surface profile of outgoing workpiece has been predicted firstly after getting the maximum spread,then the critical point has been determined.Furthermore,the formula of the equivalent contact section area has been proposed and the mean Roll Radius has been calculated.The validity of the new model has been examined by the bar Rolling experiment and the rigid-plastic FEM simulation.Compared with the existing models,the mean Roll Radius obtained by the new analytical model approaches the experimental data more closer than other models.So,it can be used as an available reference in practice and the theoretical derivation.
