Improvement of Surface Condition of Strip Cast using High Speed Twin Roll Caster.

2019 ◽  
Vol 2019.27 (0) ◽  
pp. P08
Author(s):  
Kazuki YAMAZAKI ◽  
Toshio HAGA
Keyword(s):  
High Speed ◽  
Surface Condition ◽  
Strip Cast ◽  
Twin Roll Caster ◽  
Twin Roll

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.

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%.

Strip Casting of 6061 and Recycled 6061 Alloy by an Unequal Diameter Twin Roll Caster

2011 ◽  
Vol 264-265 ◽  
pp. 1911-1916 ◽  
Author(s):  
Toshio Haga ◽  
Hideki Inui ◽  
Ryoji Nakamura ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Aluminium Alloy ◽  
Surface Condition ◽  
Bending Test ◽  
Cast Strip ◽  
Fe Content ◽  
Strip Cast ◽  
Cold Rolled ◽  
Twin Roll Caster ◽  
6061 Aluminium Alloy ◽  
Twin Roll

A 6061 aluminium alloy and an alloy with increased Fe content, representing recycled 6061 aluminium alloy were cast into strips at speed of 30m/min by an unequal diameter twin roll caster. The Fe content of 6061 aluminium alloy and the model of recycled 6061 aluminium alloy was 0.36 mass% and 0.59 mass%, respectively. Ripple marks, which are typical surface defect of roll cast strips, did not occur on the surface of both as-cast strips. Fe content did not influence the surface condition of the roll-cast-strip. The as-cast strip was cold rolled down to 1 mm, T4 heat treatment was conducted, and then subjected to180 degrees bending test. The result of 180 degrees bending test shows that roll cast 6061 aluminium alloy and 6061 aluminium alloy with increased Fe as recycled had bending ability as same as that of roll-cast 6022 aluminium alloy. In the strip cast by the twin roll caster of the present study, increased Fe content did not influence on the result of the180 degrees bending test.

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.

702 Inline rolling of strip cast by vertical type high speed twin roll caster

2012 ◽  
Vol 2012.20 (0) ◽  
pp. _702-1_-_702-4_
Author(s):  
Yusuke YAMASAKI ◽  
Toshio HAGA ◽  
Shinji Kumai ◽  
Hisaki WATARI
Keyword(s):  
High Speed ◽  
Strip Cast ◽  
Twin Roll Caster ◽  
Twin Roll

In-Line Rolling of Aluminum Alloy Strip Cast by a High Speed Twin Roll Caster

2010 ◽  
Vol 654-656 ◽  
pp. 795-798 ◽  
Author(s):  
Ryoji Nakamura ◽  
Shuuya Hanada ◽  
Sinji Kumi ◽  
Hisaki Watari
Keyword(s):  
High Speed ◽  
Surface Defects ◽  
Rolling Speed ◽  
Rolled Strip ◽  
Ripple Mark ◽  
Strip Cast ◽  
Trace Line ◽  
Cold Rolled ◽  
Twin Roll Caster ◽  
Twin Roll

In-line rolling was operated on the as-cast strip cast by a vertical type high speed twin roll caster. The AA6022 and AA6111 strip was tested. The casting and rolling speed was 60m/min. Reduction was from 20% to 55%. The temperature of the rolling was within from 400oC to 450oC. The porosity and crack in the strip were improved by the in-line rolling. The in-line as rolled strip was cold rolled down to 1mm, and T4 heat treatment was operated. The microstructure of the strip, on which in-line rolling was operated, became uniform at thickness direction than the microstructure of the strip on which only the cold rolling was operated. The surface defects like the ripple mark and trace line of the nozzle were improved.

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

Effect of Si on AA5182 Strip Cast by a High Speed Twin Roll Caster

2012 ◽  
Vol 184-185 ◽  
pp. 834-837 ◽  
Author(s):  
Toshio Haga ◽  
Kosuke Komeda ◽  
Kenta Mtsuoka ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
High Speed ◽  
Tension Test ◽  
Thickness Direction ◽  
Roll Casting ◽  
Strip Cast ◽  
Twin Roll Caster ◽  
Si Content ◽  
Twin Roll ◽  
Steel Rolls ◽  
Center Area

High speed roll casting of AA5182 aluminum alloy was tried using a vertical type high speed twin roll caster equipped with mild-steel rolls. Parting material was not used and speed was 80m/min. AA5182 strip, which thickness was 2.1mm, could be cast continuously. However, porosity occurred at center area at the thickness direction of the strip of the as-cast strip. Si was added to original AA5182 to improve the porosity at 0.2, 0.4, 0.6, 0.8 and 1.0 mass%. The porosity was improved as the content of the Si increased. The elongation resulting from the tension test was the best when 0.2mass%Si was added. The clack on the surface was improved by the increase of the Si content. Roll casting ability was improved by the Si, too.

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