Strip casting of aluminum alloy for casting using a vertical type high speed twin roll caster and investigation of strip

2020 ◽  
Vol 2020.28 (0) ◽  
pp. 223
Author(s):  
Toshio HAGA
Keyword(s):  
Aluminum Alloy ◽  
High Speed ◽  
Strip Casting ◽  
Twin Roll Caster ◽  
Twin Roll

Inline Rolling of 5182 Aluminum Alloy Strip Cast by a Vertical Type High Speed Twin Roll Caster

2010 ◽  
Vol 139-141 ◽  
pp. 477-480
Author(s):  
Ryoji Nakamura ◽  
Shuya Hanada ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Aluminum Alloy ◽  
High Speed ◽  
Rolling Speed ◽  
Center Line ◽  
Alloy Strip ◽  
Ripple Mark ◽  
Roll Casting ◽  
Strip Cast ◽  
Twin Roll Caster ◽  
Twin Roll

An inline hot rolling was operated on 5182 aluminum alloy strip cast using a vertical type high speed caster (VHSTRC) at the speed of 60 m/min. A porosity existing at center line of the thickness and a ripple mark on the surface, these are typical defects of the strip cast by the VHSTRC, could be improved by the inline rolling. The rolling speed was as same as the roll-casting-speed of 60m/min. The temperature of the strip, when the inline rolling was operated, was 450oC. The reduction of the strip of the inline rolling was 35%.

Three-Layer Clad Strip Casting Using a Vertical Type Tandem Twin Roll Caster

2018 ◽  
Vol 773 ◽  
pp. 171-178
Author(s):  
Toshio Haga ◽  
Kentaro Okamura ◽  
Hisaki Warari ◽  
Shinichi Nishida
Keyword(s):  
Aluminum Alloy ◽  
Strip Casting ◽  
Tensile Shear ◽  
Shear Testing ◽  
Roll Speed ◽  
Solidification Temperature ◽  
Twin Roll Caster ◽  
Twin Roll

This paper shows improvements made to a vertical type tandem twin roll caster and the appropriate casting conditions necessary to cast three-layer clad strips, the base strip of which has a lower solidification temperature than the overlay strip. In experiments, 4045 aluminum alloy was used for the base strip and 3003 aluminum alloy was used for the overlay strips. The roll speed was 30 m/min. By connecting the overlay strips to the base strip one at a time and cooling the base strip to between 450 and 530°C after applying the first overlay strip, a sound three-layer clad strip – defined as one in which the interfaces between strips are clear and do not separate during bending-to-failure tests – could be cast. The tensile shear testing between the base and second overlay strip was improved as the base-strip temperature was increased to 450-530°C range.

Continuous Strip Casting of Aluminum Alloy AC7A Using Commercial Scale Twin Roll Caster

2020 ◽  
Vol 2020.28 (0) ◽  
pp. 409
Author(s):  
Makoto HAGIWARA ◽  
Shogo IMAI ◽  
Takahiro SHIGA ◽  
Mizuki KAWAWA ◽  
Shinichi NISHIDA
Keyword(s):  
Aluminum Alloy ◽  
Strip Casting ◽  
Commercial Scale ◽  
Twin Roll Caster ◽  
Twin Roll ◽  
Continuous Strip

Globular Crystals in the Center of Roll Cast Aluminum Alloy Strips

2020 ◽  
Vol 1007 ◽  
pp. 34-40
Author(s):  
Toshio Haga ◽  
Maho Tsuchida ◽  
Hirotaka Sakata ◽  
Hisaki Watari ◽  
Shinichi Nishida
Keyword(s):  
Aluminum Alloy ◽  
High Speed ◽  
Strip Casting ◽  
Cast Aluminum Alloy ◽  
Thickness Direction ◽  
Cast Aluminum ◽  
Cooling Slope ◽  
Roll Gap ◽  
Twin Roll ◽  
Center Area

This study investigated the crystallization position and formation mechanism of globular crystals at the center area in the thickness direction of aluminum alloy strips cast by a high-speed twin roll caster. Twin roll casters for single strips and clad strips were used, as well as twin roll casters equipped with a cooling slope. The globular crystals were formed from dividing arms of dendrites of the solidified layer facing the center area at the roll gap. The arms of isolated dendrite also divided. No globular crystals were formed at the interfaces of clad strips with different solidification temperatures because of the temperature gradient at the interface which inhibited division of the dendrite arms. It was demonstrated that globular crystals at the center area of the thickness direction were formed by dendrite-arm-dividing at the roll gap by the strip casting clad strip. Experiments by semisolid-strip casting with the cooling slope showed that globular crystals in the molten metal existed in the solidification layers.

Changing from a Vertical Burr to a Horizontal Burr in the Vertical-Type High-Speed Twin-Roll Caster

2020 ◽  
Vol 1007 ◽  
pp. 29-33
Author(s):  
Toshio Haga ◽  
Yushi Murakami ◽  
Shou Kitamura ◽  
Hisaki Watari ◽  
Shinichi Nishida
Keyword(s):  
Mild Steel ◽  
High Speed ◽  
Side Surface ◽  
Strip Casting ◽  
Strip Edge ◽  
Twin Roll Caster ◽  
Roll Gap ◽  
Twin Roll ◽  
Semisolid Metal

Strip casting using a side dam plate produces a vertical burr at the strip edge. In the present study, changing this vertical burr into a horizontal burr using a burr changer is proposed. The burr changer was placed inside the side dam plate. The burr changer was made from mild steel and an insulator sheet and cut along the shape of the roll. The burr changer was placed so as to prevent exhaustion of semisolid metal between the side dam plate and the roll-side surface. When the position of the burr changer was appropriate, the vertical burr changed into a horizontal burr. The horizontal burr was flat. The width of the horizontal burr was affected by the lowest position of the burr changer and became narrower as the lowest position of the burr changer approached the roll gap position.

High Speed Twin-Roll Casting of Al-Mg Alloys

2010 ◽  
Vol 154-155 ◽  
pp. 1544-1548 ◽  
Author(s):  
Kosuke Komeda ◽  
Ryoji Nakamura ◽  
Shinji Kumai
Keyword(s):  
Heat Transfer ◽  
Aluminum Alloy ◽  
High Speed ◽  
Aluminum Alloy 5182 ◽  
Roll Casting ◽  
Twin Roll Caster ◽  
Deep Drawing Test ◽  
Study Heat Transfer ◽  
Twin Roll ◽  
Steel Rolls

The disadvantages of the conventional twin-roll caster for aluminum alloy are low casting speeds and limited choices of alloys that are castable by this processing. It is known that strip casting of aluminum alloy 5182 is very difficult because of their wider freezing zones. The vertical-type high-speed twin-roll caster used in the present study was devised to overcome these disadvantages. Features of the high speed twin roll casters are as below. Mild steel rolls were used in order to increase the casting speed and to be made at a lower equipment cost. Roll coating is produced in casting of Al-Mg alloy. Therefore lubricant, that resists heat transfer, was not used in the present study. Heat transfer between melt and the roll was improved by hydrostatic pressure of the melt. Low superheat casting was carried out in order to improve microstructure of the strip. In the present study, effectiveness of a high-speed twin roll caster for recycling aluminum alloy was investigated. The effects of the high-speed twin roll caster on alleviating the deterioration of mechanical properties by impurities were investigated. Properties of the cast strip were investigated by metalography, a tension test, and a deep drawing test.

Roll Casting of Al-SiCp Strip

2011 ◽  
Vol 675-677 ◽  
pp. 811-814 ◽  
Author(s):  
Toshio Haga ◽  
Teppei Nakamura ◽  
S. Kumai ◽  
H. Watari
Keyword(s):  
Hot Rolling ◽  
High Speed ◽  
Strip Casting ◽  
Cast Strip ◽  
Fine Grain ◽  
Roll Casting ◽  
Speed Up ◽  
Cold Rolled ◽  
Twin Roll Caster ◽  
Twin Roll

The strip casting of Al-SiCp alloy was operated by a high speed twin roll caster. The content of SiCp was 20Vol% and 30Vol%. Both of Al-20Vol%SiCp and Al-30Vol%SiCp strips could be cast continuously at the speed up to 90m/min. The SiCp particle distributed uniformly. This was the effect of fine grain of the strip. The as-cast strip of Al-20Vol%SiCp could be cold rolled after homogenization. The as-cast strip of Al-30Vol%SiCp could be cold rolled after once hot rolling and annealing. The as-cast strip of Al-20Vol%SiCp could be coiled at the diameter of 460mm.

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