Globular Crystal of Al Alloy Strip Cast by High Speed Twin Roll Caster

2019 ◽  
Vol 2019.27 (0) ◽  
pp. 430
Author(s):  
Toshio HAGA ◽  
Hisaki WATARI ◽  
Shinichi NISHIDA
Keyword(s):  
High Speed ◽  
Al Alloy ◽  
Alloy Strip ◽  
Strip Cast ◽  
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%.

Improvement of Porosity of Strip Using a Scraper on the Casting by a Vertical Type High Speed Roll Caster

2010 ◽  
Vol 146-147 ◽  
pp. 1108-1113 ◽  
Author(s):  
Ryoji Nakamura ◽  
Yusuke Shiotsu ◽  
Kosuke Komeda ◽  
Shinji Kumai ◽  
Hisaki Warari
Keyword(s):  
Aluminum Alloy ◽  
High Speed ◽  
Alloy Strip ◽  
Roll Speed ◽  
Strip Cast ◽  
Twin Roll Caster ◽  
Twin Roll

Porosity occurred in the 5182 aluminum alloy strip cast by a vertical type high speed twin roll caster. The porosity was caused by high-roll-speed and low-roll-load. Improvement of the porosity was tried by a scraper. The scraper was mounted on the roll, and the scraper was moveable depend on the thickness of the solidified layer on the roll. The scraper scribed the semisolid layer to improve the porosity. The scraper was useful to decrease the porosity of roll cast 5182 aluminum alloy strip.

High Speed Roll Casting of Aluminum Alloy Strip

2005 ◽  
Vol 475-479 ◽  
pp. 343-348 ◽  
Author(s):  
Ryoji Nakamura ◽  
Hisaki Watari ◽  
Shinji Kumai
Keyword(s):  
Mechanical Properties ◽  
High Speed ◽  
The Other ◽  
Alloy Strip ◽  
Cast Ingot ◽  
Cast Strip ◽  
Cooling Slope ◽  
Roll Casting ◽  
Twin Roll Caster ◽  
Twin Roll

Two kinds of roll casters, which were suitable for high speed roll casting, were devised. One was a vertical type twin roll caster, and the other was an unequal diameter twin roll caster. The semisolid roll casting using a cooling slope was adopted to these roll casters. The solid fraction was smaller than 5%. 3 mm thickness of 6111 strip was cast at 60 m/min by the vertical type twin roll caster, and 5 mm thickness of 6111 strip was cast at 30 m/min by the unequal diameter twin roll caster. The microstructure of the as-cast strip was equiaxed and spherical, not columnar. The mechanical properties of the strip rolled from roll-cast strip were almost as same as that of the strip made from cast ingot.

Effects of Nozzle and Roll on Surface Condition of Al-1%Si Strip Cast Using Vertical type High Speed Twin Roll Caster

2021 ◽  
Vol 1042 ◽  
pp. 53-59
Author(s):  
Toshio Haga ◽  
Tomoya Okada ◽  
Shinichi Nishida ◽  
Hisaki Watari
Keyword(s):  
High Speed ◽  
Crack Formation ◽  
Surface Condition ◽  
Clear Correlation ◽  
Roll Surface ◽  
Surface Cracking ◽  
Strip Cast ◽  
Twin Roll Caster ◽  
Si Content ◽  
Twin Roll

When a strip of Al-Si alloy with an Si content of 1% was cast using a vertical-type high-speed twin-roll caster, cracks form in its surface. The effects of the pouring method, the shape and position of the nozzle, and the roll surface texture on surface crack formation were evaluated with a roll caster. The rolls were made of a copper alloy, and the roll speed was 30 m/min. The as-cast strips were bent to investigate the degree of crack formation, and the outer surface of the strips was observed without magnification and with a stereomicroscope to determine the influence of the pouring method, the shape and position of the nozzle, and the roll surface. A roll machined to form V-shaped grooves 0.4 mm deep on the surface of the strips was most useful for reducing surface cracking. Changing the shape of the nozzle tip was second-most effective. There was a clear correlation between the roll surface condition and surface cracking in the Al-Si strip.

Roll Casting of Al-SiCp Composite Strip

2010 ◽  
Vol 139-141 ◽  
pp. 481-484
Author(s):  
Ryoji Nakamura ◽  
Teppei Nakamura ◽  
Ryoji Nakamura ◽  
Hideto Harada ◽  
Shinji Kumai ◽  
...  
Keyword(s):  
Cold Rolling ◽  
High Speed ◽  
Alloy Strip ◽  
Thickness Direction ◽  
Composite Alloy ◽  
Cast Strip ◽  
Roll Casting ◽  
Twin Roll Caster ◽  
Twin Roll ◽  
Steel Rolls

Roll casting of Al-SiCp composite alloy strip was tried using a vertical type high speed twin roll caster equipped with mild steel rolls. The Al-20vol% SiCp and Al-30vol%SiCp alloy could be roll-cast to the strip. The casting speed was 30m/min. The thickness of as-cast strip was thinner than 2.5mm. The SiCp powder was dispersed uniformly at the thickness direction. The as-cast strip could be thin down to 1mm by the hot rolling and the cold rolling without broken.

scholarly journals Effect of Roll Surface on Aluminum Alloy Strip Fabricated by a High-Speed Twin Roll Caster

2013 ◽  
Vol 79 (804) ◽  
pp. 1156-1160
Author(s):  
Takuya YAMASHIKI ◽  
Toshio HAGA ◽  
Shinji KUMAI ◽  
Hisaki WATARI
Keyword(s):  
Aluminum Alloy ◽  
High Speed ◽  
Alloy Strip ◽  
Roll Surface ◽  
Twin Roll Caster ◽  
Twin Roll
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