Cold Model Experiment on Infiltration of Mould Flux in Continuous Casting of Steel: Simple Analysis Neglecting Mould Oscillation

Kajitani, Toshiyuki; Okazawa, Kensuke; Yamada, Wataru; Yamamura, Hideaki

doi:10.2355/isijinternational.46.250

Cited by 26 publications

(27 citation statements)

References 6 publications

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“…A parametric study was carried out with this 2-D model, investigating the influence of various operational parameters on surface defect formation. Predictions of shell thicknesses and heat fluxes were in good agreement with prior, cold model experiments 33,34) and mold simulators. 31,32) Previous works have provided various modelling approaches to gain insights into the correlation mechanisms of thermal-flow and solidification in the mold.…”

Section: )supporting

confidence: 63%

“…The use of this technique, coupled with the understanding developed from experimental and theoretical heat-transfer studies, suggested that the oscillations in heat flux corresponded directly with variations in the shell surface profile. Kajitani et al 33,34) proposed a new mechanism to clarify the mold flux infiltration by using a cold model experiment in which silicone oil was infiltrated in the channel between the rotating belt and the acrylic plate. They confirmed the channel profile for different conditions, and also showed that the flux infiltrated from the final part of the positive strip time towards the latter half of the negative strip time.…”

Section: Transient Thermo-fluid and Solidification Behaviors In Contimentioning

confidence: 99%

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Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Evolution Phenomena

2018

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Section: )supporting

confidence: 63%

Section: Transient Thermo-fluid and Solidification Behaviors In Contimentioning

confidence: 99%

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Evolution Phenomena

2018

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“…Silicone oil is poured into the channel between a moving polyester belt and an acrylic plate. As precisely described in the preceding article, 26) this experiment is characterized by the following mechanisms around the acrylic plate.…”

Section: Mechanical System For Simulating the Motion Of Amentioning

confidence: 99%

“…In the preceding study, 26) the experiment was carried out in a simple situation that neglects the oscillating motion. It revealed that the profile of the flux channel below meniscus has critical influence on the infiltration behavior of mould flux.…”

Section: )mentioning

confidence: 99%

“…This discrepancy will be discussed on the basis of our theoretical model. 23,24,26) In our previous report, 26) the infiltration of silicone oil in this experiment was formulated by the Navier-Stokes equation for the simple case neglecting the oscillation. For the purpose of including the oscillation for the present study, only its boundary condition at the belt surface must be changed.…”

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Cold Model Experiment on Infiltration of Mould Flux in Continuous Casting of Steel: Simulation of Mould Oscillation

et al. 2006

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System for Simulating Mould OscillationIn the present study, the system for the belt rotation was totally changed in order to investigate the effect of the oscillation on the oil infiltration. In the previous experiment that neglects the oscillating motion, a normal AC motor was used just for the belt movement at constant velocities. 26) In contrast, in this study, an AC servomotor was installed with a controller that is connected to a function generator (see Fig. 2). Using this system, the belt velocity was set as a function that consists of both time independent and time dependent velocities. The time independent velocity, V C , corresponds to casting velocity, and the time dependent velocity, V M , represents oscillating velocity of mould, which is written as:.................... (1) Where, t is the time, S and f indicate the stroke and frequency of oscillation, respectively.During the experiment, both the rotating velocity of the servomotor and displacement of the acrylic plate measured by the linear gauge sensor are transmitted simultaneously to a personal computer. This makes it possible to observe dynamic change in the film thickness of the oil in relation to the cyclic variation in the belt velocity. In a continuous casting mould, the in-situ observation of the film thickness of mould flux cannot be realized during operation. The present cold model, which overcomes this problem, will provide a better understanding of the infiltration behavior of mould flux.Precisely, there remains a difference between the mould flux infiltration in continuous casting and the oil infiltration in this experiment as indicated in Fig. 1. In continuous casting, the strand is moving downward at casting velocity, V C , and the mould is reciprocating at V M . On the other hand in the present experiment, for simplicity of the mechanism in the apparatus, the acrylic plate is fixed in the vertical direction and only the belt is moving at V C ϩV M . This discrepancy will be discussed on the basis of our theoretical model. 23,24,26) In our previous report, 26) the infiltration of silicone oil in this experiment was formulated by the Navier-Stokes equation for the simple case neglecting the oscillation. For the purpose of including the oscillation for the present study, only its boundary condition at the belt surface must be changed. Thus, replacing the boundary condition uϭV C with uϭV C ϩV M at zϭ0 in Eq. (3) in Ref. 26) and solving it, one obtains a force with which the acrylic plate is pushed away from the belt by pressure generated in the oil channel, F (N/m)......... (2) Where L represents length of the oil channel, m the dynamic viscosity of oil, r the density of oil, g the gravity constant, P 0 , P L the pressure at the entrance and exit of the channel, respectively. P 0 is set to pgd in which d is depth of oil pool, P L is zero. Where x is the distance from the entrance of the channel along the belt surface, and h(x) is the film thickness of oil as a function of x. Each of the three terms of Eq. (2) represents the contributio...

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Experimental Study on Mold Flux Lubrication for Continuous Casting

Yang

Meng

Zhu

2013

steel research int.

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A new experimental apparatus for simulating mold oscillation of continuous casting was developed to clarify the flux lubrication mechanism in mold channel. Mixed oil which was simulated mold flux was poured and infiltrated down into the channel, and the consumption, liquid level and pressure of mixed oil were detected in the process of oscillation as well as the mechanism of flux process. The results show that the channel of flux with a profile becomes wider along the casting direction, and the lag time of periodical shifting pressure to the oscillating motion is strongly dependent on the flux viscosity and oscillation frequency. The liquid film thickness of flux has a significant influence on the infiltration behavior compared with the oscillating motion of the mold. The liquid flux infiltrates down from the end of positive strip time to the beginning of next positive strip time, and the infiltration is largely dependent on the negative strip time in between. The increase of viscosity of flux, casting speed and oscillation frequency enhances the liquid friction due to the reduction of the mold flux consumption. On the contrary, the higher non-sinusoidal oscillation factor improves the infiltration and decreases the frictional force. The oscillation amplitude increases the consumption and liquid friction slightly.

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Cold Model Experiment on Infiltration of Mould Flux in Continuous Casting of Steel: Simple Analysis Neglecting Mould Oscillation

Cited by 26 publications

References 6 publications

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Evolution Phenomena

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Evolution Phenomena

Cold Model Experiment on Infiltration of Mould Flux in Continuous Casting of Steel: Simulation of Mould Oscillation

Experimental Study on Mold Flux Lubrication for Continuous Casting

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