Hot and cold strip rolling processes

Montmitonnet, Pierre

doi:10.1016/j.cma.2005.10.014

Cited by 93 publications

(52 citation statements)

References 44 publications

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“…The final thickness is obtained after 10 rolling passes, with reduction ratio decreasing from 25% to 10%. Before being cold rolled, the hot rolled strip must be treated in order to remove oxide scales (Mougin et al 2003, Montmitonnet 2006. For that purpose, the strip is shot blasted and pickled in hydro chloric acid bath.…”

Section: 1mentioning

confidence: 99%

How to select the most relevant 3D roughness parameters of a surface

2013

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This is the pre-peer reviewed version of the following article: Deltombe R., Kubiak K.J., Bigerelle M, How to select the most relevant 3D roughness parameters of a surface (2011) Summary:In order to conduct a comprehensive roughness analysis, around sixty 3D roughness parameters are created to describe most of the surface morphology with regard to specific functions, properties or applications. In this paper, a multiscale surface topography decomposition method is proposed with application to stainless steel (AISI 304), which is processed by rolling at different fabrication stages and by electrical discharge tool machining. Fifty-six 3Droughness parameters defined in ISO, EUR, and ASME standards are calculated for the measured surfaces. Then, expert software "MesRug" is employed to perform statistical analysis on acquired data in order to find the most relevant parameters characterizing the effect of both processes (rolling and machining), and to determine the most appropriate scale of analysis. For the rolling process: The parameter Vmc (the Core Material Volume-defined as volume of material comprising the texture between heights corresponding to the material ratio values of p = 10% and q = 80%) computed at the scale of 3 mm is the most relevant parameter to characterize the cold rolling process. For the EDM Process, the best roughness parameter is SPD that represents the number of peaks per unit area after segmentation of a surface into motifs computed at the scale of 8 µm.

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Section: 1mentioning

confidence: 99%

How to select the most relevant 3D roughness parameters of a surface

2013

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“…When flatness defects can be neglected, simpler 2D models can be used, especially when thickness reductions are small. 1D models are sometimes sufficient and cheaper in terms of computational time; in the case of flat products, a 1D model is perfect for a ratio between the length of the roll bite and the strip thickness higher than 3 [1].…”

Section: Numerical Modelling Of Cold Rolling Conditions Measured Durimentioning

confidence: 99%

“…Montmitonnet [1] gives a review of rolling numerical models. Different numerical approaches, either 1, 2 or 3D have been used to model cold rolling, depending on the required precision and relevant input parameters.…”

Section: Numerical Modelling Of Cold Rolling Conditions Measured Durimentioning

confidence: 99%

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Ultrasonic roll bite measurements in cold rolling: Contact length and strip thickness

Carretta

Hunter

Boman

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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Abstract.In cold rolling of thin metal strip, contact conditions between the work rolls and the strip are of great importance: roll deformations and their effect on strip thickness variation may lead to strip flatness defects and thickness inhomogeneity. To control the process, online process measurements are usually carried out; such as the rolling load, forward slip and strip tensions at each stand. Shape defects of the strip are usually evaluated after the last stand of a rolling mill thanks to a flatness measuring roll. However, none of these measurements is made within the roll bite itself due to the harsh conditions taking place in that area.This paper presents a sensor capable of monitoring strip thickness variations as well as roll bite length in situ and in real time. The sensor emits ultrasonic pulses that reflect from the interface between the roll and the strip. Both the time-of-flight (ToF) of the pulses and the reflection coefficient (the ratio of the amplitude of the reflected signal to that of the incident signal) are recorded.The sensor system was incorporated into a work roll and tested on a pilot rolling mill.Measurements were taken as steel strips were rolled under several lubrication conditions. Strip thickness variation and roll-bite length obtained from the experimental data agree well with numerical results computed with a cold rolling model in the mixed lubrication regime.

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“…Therefore, numerical simulations are needed to understand and quantify all mechanisms involved in the different processes. Thus, significant efforts have been made for the simulation of the rolling process [1,2], the run out table [3][4][5] and the coiling process [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Residual stress on the run out table accounting for multiphase transitions and transformation induced plasticity

Weisz-Patrault

Koedinger

2018

Applied Mathematical Modelling

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The development of harder and thinner new steel grades necessitates reasonably fast numerical simulations of forming processes in order to optimize industrial conditions through parametric studies. This paper focuses on the evolution of residual stresses of thin strips during cooling on the run out table. Since the problem involves multiphysics and non-linear processes, comprehensive and fully coupled numerical approaches may be difficult to use to design or optimize industrial conditions because of extensive computation times. Therefore, a simplified numerical simulation has been developed and consists in solving first the thermal problem coupled with multiphase transitions and then the mechanical problem accounting for thermal expansion, metallurgical deformation and transformation induced plasticity. Residual stress profiles through the strip thickness are also computed in order to evaluate classic flatness defects such as crossbow and longbow. A postprocessing is also included in order to quantify out of plane displacements that would take place if the strip were cut off the production line. It consists in computing at finite strain the relaxation of residual stresses when the tension applied by the coiler is released. The proposed numerical strategy has been tested on common industrial conditions. Highlights• Numerical strategy to simulate a non-linear and multiphysics problem: the cooling of a steel strip on the run out table.• Heat conduction strongly coupled with metallurgical transformations and an elastic-plastic calculation of residual stress evolution.• Thermal expansion, density mismatch between phases and transformation induced plasticity modeled as eigenstrain.• Significant decrease of the initial residual stress profile, but the asymmetry is responsible for bending moments• Flatness defects such as longbow and crossbow are detected.Preprint submitted to Applied Mathematical Modelling September 3, 2017 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Residual stress on the run out *Highlights AbstractThe development of harder and thinner new steel grades necessitates reasonably fast numerical simulations of forming processes in order to optimize industrial conditions through parametric studies. This paper focuses on the evolution of residual stresses of thin strips during cooling on the run out table. Since the problem involves multiphysics and non-linear processes, comprehensive and fully coupled numerical approaches may be difficult to use to design or optimize industrial conditions because of extensive computation times. Therefore, a simplified numerical simulation has been developed and consists in solving first the thermal problem coupled with multiphase transitions and then the mechanical problem accounting for thermal expansion, metallurgical deformation and transformation induced ...

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Hot and cold strip rolling processes

Cited by 93 publications

References 44 publications

How to select the most relevant 3D roughness parameters of a surface

How to select the most relevant 3D roughness parameters of a surface

Ultrasonic roll bite measurements in cold rolling: Contact length and strip thickness

Residual stress on the run out table accounting for multiphase transitions and transformation induced plasticity

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