Abstract
A hot rolling operation is performed to alter the thickness of a metal by passing the material through a pair of rollers, forming a gap that is somewhat narrower than the thickness of the material. Therefore, the quality of the product is a function of the pressure applied by the rollers. However, in this process, a roll hunting force occurs in which the rolling force is irregularly changed during the rotation of the rollers due to various complex mechanisms, which include roll surface hardness, difference in rotational speed between rolls, heat treatment conditions, and roll wear. In this study, roll wear tests were conducted to analyze the roll hunting force caused by variation in the hardness of the work roll. The friction coefficient of the work roll was then examined based on hardness. Then, a two-dimensional finite element model was constructed to investigate the roll hunting force as a function of the change in friction coefficient of the work roll. This finite element model was verified in relation to the theoretical rolling expression. Finite element model analysis was performed for three friction coefficients, and the effect of the roll hunting force was determined based on the reduction ratio and temperature. In addition, the wear depth of the work roll by the hardness was predicted. The influence of the abrasion of the work roll on the hunting force was analyzed.
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Acknowledgments
The study was supported by research funds from the hyundai steel institute and Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea. (Grant No. 20194010201790).
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Hun Bong Lim received his master’s degree in mechanical design and mechatronics from Hanyang University, Korea. He is currently writing his Ph.D. thesis on structural vibration analysis of hot rolling mill. His research interests are related to structural dynamic analysis and plastic analysis.
Hyun Ik Yang is a Full Professor in the Hanyang University, Korea. He received the M.S and Ph.D. degrees in mechanical engineering from the Columbia University, USA. His main research interests are mechanical system design, optimum design/CAE, automatic finite element mesh generation, and energy conversion.
Chang Wan Kim received his Ph.D. in aerospace and engineering mechanics from the University of Texas at Austin, USA. He is currently an Associate Professor in School of Mechanical Engineering at Konkuk University, Korea. His research interests are in the field of paralleling computing on large scale vehicle noise and vibration (NVH) with FEM.
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Lim, H.B., Yang, H.I. & Kim, C.W. Analysis of the roll hunting force due to hardness in a hot rolling process. J Mech Sci Technol 33, 3783–3793 (2019). https://doi.org/10.1007/s12206-019-0721-3
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DOI: https://doi.org/10.1007/s12206-019-0721-3