Finite-Element Analysis of a Vertical Twin-Roll Casting

다국어 초록 (Multilingual Abstract)

Metallic strips can be produced by twin-roll casting, in which the melt is cooled, solidified, and rolled to aspecific thickness. In the present study, the rigid-thermoviscoplastic finite-element method was applied tothe analysis of complex phenomena including melt flow, heat transfer, solidification, and plastic deformationoccurring in a vertical twin-roll casting of magnesium alloy AZ31. The melt was found to be confined in rotationalmotions of two symmetric vortexes developed at the roll entrance, and thus only the melt near the nozzlewall became solidified and rolled to a sheet. As the nozzle thickness increased, the vortex increased in sizeresulting in more bifurcation and instability, which are definitely adverse to material properties of the strip. The maximum cooling rate of 600 °C/s was found at the centerline as solidification took place at the rollexit. Other findings are also discussed including roll force, roll torque, and pressure distribution, which weregreatly dependent upon the plastic deformation after solidification.

참고문헌 (Reference)

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