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Keywords = work roll (WR)

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13 pages, 8854 KiB  
Article
Analysis of Edge Drop on Strip Due to Bending and Elastic Deformation of Back up Rolls in a Four-High Cold Mill
by Rumualdo Servin, Ismael Calderon, Sixtos A. Arreola, Alejandro Perez, Alma R. Mendez and Hector J. Vergara
Metals 2024, 14(2), 181; https://doi.org/10.3390/met14020181 - 1 Feb 2024
Cited by 1 | Viewed by 2131
Abstract
The superficial quality of the strip is a very important issue in steel production. Considering the dimensions, the thickness is one of the most important variables in the production of a strip. In the present study, the elastic curve of Back Up Rolls [...] Read more.
The superficial quality of the strip is a very important issue in steel production. Considering the dimensions, the thickness is one of the most important variables in the production of a strip. In the present study, the elastic curve of Back Up Rolls (BURs) is analyzed, considering them as simply supported beams as well as the effect of rolls on the profile of the strip, specifically in the strip edge producing edge drop. The analysis included theoretical and numerical measurements in the mill. The results showed that there is an instability zone of 76 mm in the strip edge, and this geometry is symmetrical in both ends of the strip. This study not only provides a theoretical basis for the edge drop, but also provides a basis for the understanding of deformation on rolls used in rolling mill processes and their effect on the thickness, profile, shape, and dimensional quality of strips. To reduce the edge drop and significantly improve the surface quality of the strip, it is suggested to complement the simulation by compensating for the elastic curve of BUR, in the process applying bending on Work Roll (WR) combined with the use of positive crowns on it. Full article
(This article belongs to the Section Metal Casting, Forming and Heat Treatment)
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16 pages, 5283 KiB  
Article
Effect of Crown Shape of Rolls on the Distribution of Stress and Elastic Deformation for Rolling Processes
by Rumualdo Servin, Sixtos A. Arreola, Ismael Calderón, Alejandro Perez and Sandra M. San Miguel
Metals 2019, 9(11), 1222; https://doi.org/10.3390/met9111222 - 14 Nov 2019
Cited by 10 | Viewed by 6720
Abstract
The present work analyzes the influence of crown shape on the distribution of stresses and deformation for rolling processes. This study consists of a Finite Element Analysis considering combinations of crown shape for Back Up Roll and Work Roll, rolling forces, properties of [...] Read more.
The present work analyzes the influence of crown shape on the distribution of stresses and deformation for rolling processes. This study consists of a Finite Element Analysis considering combinations of crown shape for Back Up Roll and Work Roll, rolling forces, properties of materials and dimensions of rolls and strip. An analysis of the rolls based on a double cantilever model with the fulcrum of the beams in a centerline mill was carried out. The results show that maximum stress concentrations for all combinations of crown shape analyzed appear on both sides 787.4 mm from the mill centerline, exactly on the sides of the strip. In this area, the maximum stress for the best combination of crown shape is larger than in the centerline mill, increasing from 34.2 MPa to 163.0 MPa. This is proportional according to Hooke’s law for which strain of rolls increases from 3.4067 × 10−4 to 4.8368 × 10−4. The worst combinations of crown shapes were obtained when the shapes of the barrel are the same for the BUR and WR; for example: Combination 1 (BUR Positive–WR Positive), Combination 5 (BUR Flat–WR Flat), and Combination 9 (BUR Negative–WR Negative). Full article
(This article belongs to the Special Issue Rolling of Metals)
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