Investigation and modelling of work roll temperature in induction heating by finite element method

Bao, Li; Qi, Xiwei; Mei, R-B.; Zhang, X.; Li, GL

doi:10.17159/2411-9717/2018/v118n7a7

Cited by 5 publications

(3 citation statements)

References 12 publications

(16 reference statements)

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“…Trull et al [18] developed an FEM model incorporating all major mill components and engineering and process conditions, including thermal camber, for the simulation of shape evolution. Bao et al [19] investigated the temperature distribution of the work roll, integrating FEM coupled electromagnetic-thermal analysis in order to include the effect of roll induction heating on the surface temperature. Deng et al [20] developed an analytical FEM model to investigate the thermal and oxidation behavior of an HSS (High Speed Steel) work roll during hot rolling.…”

Section: Introductionmentioning

confidence: 99%

Thermal Camber and Temperature Evolution on Work Roll during Aluminum Hot Rolling

Gavalas

Papaefthymiou

2020

Metals

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Flatness is an important quality characteristic for rolled products. Modern hot rolling mills are equipped with actuators that can modify the uneven thickness distribution across the width of the strip (crown), taking into account online measurements of various process parameters such as temperature, force and exit strip profile, either automatically or manually by the operator. However, the crown is also influenced by many parameters that cannot easily be measured during production, such as work roll temperature evolution through thickness and roll geometric variation due to thermal expansion (thermal camber). These have an impact on the strip flatness. In this paper, a thermo-mechanical finite element model on LS-DYNA™ software was utilized to predict the influence of process parameters, and more specifically strip temperature, cooling strategy (application of cooling on the entry or entry and exit side simultaneously) and roll core temperature, on the evolution of roll temperature and thermal camber. The model was initially validated with industrial data. The results indicate that the application of both entry and exit cooling is ~30% more efficient compared to the entry cooling only, thus the thermal camber will be reduced by 2 μm. A hotter roll (380 K) is more stable compared to the cold roll (340 K), showing also an improvement of 2 μm. The hotter roll will also reach a thermal steady state on the surface faster compared to the colder one, without making a significant difference on the steady state temperature. Strip temperature plays a roll in the thermal camber evolution, but it is a less important parameter compared to cooling strategy and roll temperature.

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Section: Introductionmentioning

confidence: 99%

Thermal Camber and Temperature Evolution on Work Roll during Aluminum Hot Rolling

Gavalas

Papaefthymiou

2020

Metals

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“…Many researchers have focused on the prediction of thermal camber and the methodology for heat extraction through cooling [47][48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2020

MCMS

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“…He provided the finite element calculation model but not the expression for the Joule heat of the coil. In other studies related to the induction heating process and induction coil design [18,19,20], the full-coupling numerical method was also used for the induction heating calculations. Although the results were satisfactory, the time cost was high and the applicability was low for coils of different shapes and sizes or with different processing conditions.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Calculation Method of Heat Source Model for Induction Heating

et al. 2019

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Line heating is used in forming the complex curve plates of ships, and this process is becoming integrated into automated tools. Induction heating equipment has become commonly used in automatic line heating. When applying automated equipment, it is necessary to calculate the relationship between the heating parameters and the temperature field. Numerical methods are primarily used to accomplish the calculations for induction heating. This computation process requires repeated iterations to obtain a stable heat generation rate. Once the heat generation rate changes significantly, a recalculation takes place. Due to the relative position of the coil and plate changes during heating, the grid needs to be frequently re-divided during computation, which dramatically increases the total computation time. In this paper, through an analysis of the computation process for induction heating, the root node that restricts the computation efficiency in the conventional electromagnetic-thermal computation process was found. A method that uses a Gaussian function to represent the heat flux was proposed to replace the electromagnetic computation. The heat flux is the input for calculating the temperature field, thus avoiding the calculation of the electromagnetic analysis during induction heating. Besides, an equivalence relationship for multi-coil was proposed in this paper. By comparing the results of the experiment and the numerical method, the proposed heat source model’s effectiveness was verified.

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Investigation and modelling of work roll temperature in induction heating by finite element method

Cited by 5 publications

References 12 publications

Thermal Camber and Temperature Evolution on Work Roll during Aluminum Hot Rolling

Thermal Camber and Temperature Evolution on Work Roll during Aluminum Hot Rolling

Untitled

A Simplified Calculation Method of Heat Source Model for Induction Heating

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