A Simple Analytical Model for a Single Roll Thin Strip Casting Process

In the continuous strip casting process a meniscus forms a compliant boundary between the casting nozzle and transporting conveyor. Movement of this meniscus during casting has been shown to create surface defects, which require extensive cold work to remove and limit the minimum thickness for which sections may be cast. This paper discusses experimental work conducted to test an analytical model of the meniscus oscillation. A high frame rate shadowgraph technique was used on an isothermal water model of the casting process to observe meniscus motion, and thus allowing the calculation of meniscus frequency, amplitude, contact points and contact angles. Both natural frequency and flow excited tests were conducted. Natural frequency tests were also conducted using mercury as the working fluid, having a non-wetting contact angle, typical of molten metals. The experimental results were found to be in good agreement with the predictions of theory for both wetting and non-wetting conditions. The experimentally verified analytical model for meniscus motion is valuable to the design of the continuous casting process, because it offers an opportunity to mitigate the effects of boundary motion on surface quality.

Download Full-text

Isothermal Modeling of Meniscus Oscillation in the Continuous Strip Casting Process

Journal of Fluids Engineering ◽

10.1115/1.4005426 ◽

2011 ◽

Vol 133 (12) ◽

Cited By ~ 1

Author(s):

Kevin W. Wilcox ◽

A. Gordon L. Holloway ◽

Andrew G. Gerber

Keyword(s):

Natural Frequency ◽

Analytical Model ◽

Cold Work ◽

Casting Process ◽

Contact Angles ◽

Strip Casting ◽

Water Model ◽

Geometrical Parameters ◽

Contact Points ◽

Continuous Strip

In the continuous strip casting process a meniscus forms a compliant boundary between the casting nozzle and transporting conveyor. Movement of this meniscus during casting has been shown to create surface defects, which require extensive cold work to remove and limit the minimum thickness for which sections may be cast. This paper discusses experimental work conducted to test an analytical model of the meniscus oscillation. A high frame rate shadowgraph technique was used on an isothermal water model of the casting process to observe meniscus motion, and thus allow the calculation of meniscus frequency, amplitude, contact points and contact angles. Both natural frequency and flow excited tests were conducted. Natural frequency tests were also conducted using mercury which has a nonwetting contact angle typical of molten metals. The experimental results were found to be in good agreement with the predictions of theory for both wetting and nonwetting conditions. The experimentally verified analytical model for meniscus motion is valuable to the design of a continuous casting process because it describes the effect of geometrical parameters on meniscus motion and thus provides an opportunity to mitigate the effects of boundary motion on surface quality.

Download Full-text

Analysis of Casting Roll Temperature Field during Twin-Roll Thin Strip Casting

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.32.169 ◽

2008 ◽

Vol 32 ◽

pp. 169-172 ◽

Cited By ~ 2

Author(s):

Xiao Ming Zhang ◽

Zheng Yi Jiang ◽

Hei Jie Li ◽

Z. Fan ◽

Xiang Hua Liu ◽

...

Keyword(s):

Temperature Field ◽

Thermal Deformation ◽

Casting Process ◽

Processing Parameters ◽

Strip Casting ◽

Thin Strip ◽

Surface Cracks ◽

Roll Temperature ◽

Roll Casting ◽

Twin Roll

In twin-roll strip casting process, the temperature variation of casting roll can result in roll thermal stress and fatigue. It not only affects the thermal deformation of casting roll and the generation of the roll surface cracks significantly, but also influences the surface quality, shape and profile of the produced strip, and the service life of the casting roll. In this paper, a 3D coupling thermal-flow finite element modelling has been conducted. For twin-roll casting of stainless steel, the influences of the casting speed and liquid level in molten pool on the temperature field of casting roll have been simulated and discussed. The developed model is very helpful in optimising the processing parameters and the design of casting roll during twin-roll thin strip casting.

Download Full-text

Continuous Strip Casting, Microstructure and Performance of Ag-Cu Brazing Alloy

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.116-117.750 ◽

2006 ◽

Vol 116-117 ◽

pp. 750-753 ◽

Cited By ~ 2

Author(s):

Kee Ahn Lee ◽

Sung Jun Kim ◽

Young Mo Kim ◽

Moon Chul Kim

Keyword(s):

Mechanical Properties ◽

Hardness Test ◽

Casting Process ◽

Strip Casting ◽

Thin Strip ◽

X Ray Diffraction ◽

Electron Microscopic ◽

And Performance ◽

Twin Roll ◽

Continuous Strip

This study sought to examine the suitability of the continuous strip casting process as a new fabrication method for the Ag-Cu brazing alloy. Several continuous strip casting processes such as planar flow casting, melt dragging, and twin roll strip casting were applied to the manufacture of the Ag-32%Cu strip. In particular, twin roll strip casting was found to realize the best strip shaping ability and microstructural homogeneity. The effect of aging heat treatment on the microstructure and mechanical properties of a Ag-Cu strip was also investigated through tensile test, hardness test, X-ray diffraction (XRD), scanning electron microscopic (SEM) observations, and electron probe microanalysis (EPMA). Tensile results showed gradually decreasing strengths and simultaneously increasing elongation with longer aging time. An appropriate TS strength of 283 MPa and a significantly enhanced plasticity of 41% were realized with aging condition of 670oC/2hrs. Finally, twin-rolled strips 1 mm thick could be cold-rolled to a very thin strip (80~100 μm thickness). The microstructural evolution and crystalline morphologies of Ag-Cu metastable strips were also investigated and related to the mechanical properties.

Download Full-text