Analysis of bulging in continuously cast slabs by bending theory of continuous beam.

Yoshii, Akihiko; Kihara, Shigefumi

doi:10.2355/isijinternational1966.26.891

Cited by 18 publications

(8 citation statements)

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“…Since the parameters that affect bulging are not essentially constant during casting, the behavior of slab bulging is rather unsteady [1][2][3][4] than steady, therefore, bulging profile changes with time. When the fluctuation of bulging with time (called unsteady bulging) is very large, it may lead to serious fluctuations in the mold level.…”

Section: Introductionmentioning

confidence: 99%

The Mechanism of Unsteady Bulging and Its Analysis with the Finite Element Method for Continuously Cast Steel.

Lee

Yim

2000

ISIJ International

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The movements of the driven rolls were measured during the continuous casting of steel and their fluctuations were compared with other signals such as the casting speed and the mold level. From the observation of large fluctuations in the movements of the driven rolls and the unevenness in the thickness of the solid shell, it is proposed that the unevenness in the thickness of the solid shell is the main reason for unsteady bulging during the casting of medium carbon steel. A two-dimensional model over the successive rolls was used to calculate the bulging profile and its changes with time, during the fluctuations in the casting speed, with the finite element method. As a result, the calculations were in good agreement with the experimental results, and, it could be concluded that the period of unsteady bulging is greatly influenced by the roll pitch, therefore, depends on the locations where different roll pitches occur, and is somewhat affected by casting speed variations. Finally, based on the calculations and the experimental results, the effect of the unsteady bulging on the mold level was discussed.KEY WORDS: continuous casting; driven roll; unsteady bulging; bulging over successive rolls; liquid level fluctuation; unevenness of shell thickness; roll pitch.

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Section: Introductionmentioning

confidence: 99%

The Mechanism of Unsteady Bulging and Its Analysis with the Finite Element Method for Continuously Cast Steel.

Lee

Yim

2000

ISIJ International

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“…In this study, the continuous beam model proposed by Yoshii et al 15) has been used to calculate the dynamic and unsteady bulging profile of strand through the full roll pitches. The two-dimensional bulging model of the longitudinal cross section through the middle of the strand shown in Fig.…”

Section: Strand Bulging Calculation (Continuous Beam Model)mentioning

confidence: 99%

“…[11][12][13][14][15][16][17][18][19][20][21] However, their origin and detailed mechanisms have not been known clearly until now. The numerical analysis of strand bulging considering movement of strand and unsteady behavior through the full range of a continuous caster has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Mold Level Hunching by Unsteady Bulging during Thin Slab Casting.

et al. 2002

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In order to analyze the phenomenon of mold level hunching (MLH) during thin slab casting process, the variation of the mold level and the bulging of strand were measured and analyzed using Fast Fourier Transform (FFT) spectrum analysis. Both of mold level hunching and bulging had the same frequency and the specific frequency corresponded to the main roll pitch of the thin slab caster. The unsteady bulging was found to be a main reason of mold level hunching. The unsteady bulging profile through the full range of the caster and the height of mold level hunching were calculated using a heat transfer model and a continuous beam model. The effects of process variables on mold level hunching and the process condition of reducing mold level hunching were studied. The amount of mold level hunching increased as unsteady bulging increased due to the hunching of casting speed. An aperiodic roll pitch between segments could be effective in reducing mold level hunching.KEY WORDS: mold level hunching (MLH); unsteady bulging; FFT analysis; continuous beam model; thin slab casting; aperiodic roll pitch.

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“…In these methods, continuous beam models and plate models are usually suggested. The slab was regarded as a beam in beam models based on the theory of bending beam [3,4]. And the slab was regarded as a plate in plate models based on the plate theory [5,6].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Bulge Deformation between 2D and 3D Finite Element Models

Qin

Shang

et al. 2014

Advances in Mechanical Engineering

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Bulge deformation of the slab is one of the main factors that affect slab quality in continuous casting. This paper describes an investigation into bulge deformation using ABAQUS to model the solidification process. A three-dimensional finite element analysis model of the slab solidification process has been first established because the bulge deformation is closely related to slab temperature distributions. Based on slab temperature distributions, a three-dimensional thermomechanical coupling model including the slab, the rollers, and the dynamic contact between them has also been constructed and applied to a case study. The thermomechanical coupling model produces outputs such as the rules of bulge deformation. Moreover, the three-dimensional model has been compared with a two-dimensional model to discuss the differences between the two models in calculating the bulge deformation. The results show that the platform zone exists in the wide side of the slab and the bulge deformation is affected strongly by the ratio of width-to-thickness. The indications are also that the difference of the bulge deformation for the two modeling ways is little when the ratio of width-to-thickness is larger than six.

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Analysis of bulging in continuously cast slabs by bending theory of continuous beam.

Cited by 18 publications

References 0 publications

The Mechanism of Unsteady Bulging and Its Analysis with the Finite Element Method for Continuously Cast Steel.

The Mechanism of Unsteady Bulging and Its Analysis with the Finite Element Method for Continuously Cast Steel.

Analysis of Mold Level Hunching by Unsteady Bulging during Thin Slab Casting.

Comparative Analysis of Bulge Deformation between 2D and 3D Finite Element Models

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