Abstract
Two types of high-speed twin-roll casters and a single-roll caster equipped with a scraper were proposed. One of the twin-roll casters is a vertical-type high-speed twin-roll caster, and the other twin-roll caster is an unequal-diameter twin-roll caster. The vertical-type high-speed twin-roll caster can cast strip at speeds of up to 120 m/min. The unequal-diameter twin-roll caster casts strip at speeds up to 60 m/min. The unequal-diameter twin-roll caster is superior to the vertical-type high-speed twin-roll caster at the point of conveyance of the cast strip. A single-roll caster equipped with a scraper can cast strip without center-line segregation at speeds of up to 40 m/min. The use of a copper alloy roll and the non-use of a parting material enable high-speed roll casting. Since the roll loads of these casters are smaller than 0.1 kN/mm, soft copper alloy roll can be used. The strip does not stick to the roll without the parting material because of the use of the copper alloy roll with high thermal conductivity and the small roll load. The cooling rate near the surface is higher than 2000 °C/s.
Highlights
The conventional twin-roll caster for aluminum alloy (CTRCA) can cast strip directly from molten metal
A vertical type high speed twin roll caster (VHSTRC) was designed based on this these results shown in Figures 1 and 2 [15]
In order order to to improve improve the the center-line center-line segregation segregation and the surface surface crack, a single-roll caster equipped with a scraper (SRCs) was proposed [44]
Summary
The conventional twin-roll caster for aluminum alloy (CTRCA) can cast strip directly from molten metal. The increase in the casting speed and productivity was investigated using a large-diameter roll, a thin gage, and a long set back in the CTRCA [1,2,3,4,5,6,7,8]. The increase in roll speed has been investigated by other methods for more than twenty years at the Material Processing Laboratory at the Osaka Institute of Technology. The thermal conductivity of the roll has been increased, non-use of a parting material, and the use of hydrostatic pressure of the molten metal have been investigated [12].
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