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

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.

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

The Proceedings of the Materials and processing conference ◽

10.1299/jsmemp.2019.27.p08 ◽

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

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.184-185.834 ◽

2012 ◽

Vol 184-185 ◽

pp. 834-837 ◽

Cited By ~ 2

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.139-141.477 ◽

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%.

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Investigation of Burr on Strips Cast by Vertical-Type High-Speed Twin Roll Caster

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.831.40 ◽

2020 ◽

Vol 831 ◽

pp. 40-45 ◽

Cited By ~ 1

Author(s):

Toshio Haga ◽

Takuya Yamashiki ◽

Hisaki Watari ◽

Shinichi Niahida

Keyword(s):

High Speed ◽

Lower Edge ◽

Strip Surface ◽

Factors Affecting ◽

Twin Roll Caster ◽

Si Content ◽

Twin Roll ◽

Shape And Size

The factors affecting the shape and size of burrs that form at the edges of strips cast by a vertical type twin roll caster were investigated in this study. The size of the burr was found to be affected by the Si content of the strip. When the Si content was larger than 7 mass%, the burrs became larger. The position of the lower edge of the side dam plate also affected the shape of the burr. The burrs that formed were generally perpendicular to the strip surface but changed to being parallel to the strip surface as the position of the lower edge of the side dam plate was displaced upward from the center of the rolls.

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Roll Casting and Die Casting of Si-Added Al-Mg Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1007.12 ◽

2020 ◽

Vol 1007 ◽

pp. 12-17

Author(s):

Toshio Haga ◽

Shinichiro Imamura ◽

Hiroshi Fuse ◽

Hisaki Watari ◽

Shinichi Nishida

Keyword(s):

High Speed ◽

Die Casting ◽

Sheet Forming ◽

Mg Alloy ◽

Tension Tests ◽

Roll Casting ◽

Cold Rolled ◽

Twin Roll Caster ◽

Si Content ◽

Twin Roll

Si ranging from 0.2 mass% to 2.0 mass% was added to Al-5%Mg alloy (5182) and strip was cast by a vertical type high-speed twin-roll caster at a speed of 80 m/min. The as-cast strip was cold-rolled down to 1 mm thickness and annealed. The mechanical properties were investigated using cup tests and tension tests. The limiting draw ratio (LDR) of the 5182 alloy was 2.0 and the LDR became smaller as the Si content increased. When the Si content was 2.0 mass%, the LDR was 1.8, which shows that Si-added 5182 can be used for sheet forming, if the Si content is less than 2.0 mass%. The tensile strength and elongation were almost constant when the Si content was less than 1 mass%, but decreased at 2.0 mass% Si. However, the elongation was greater than 20% at 2.0 mass% Si. For die casting, 2.0 mass% Si was determined as the appropriate content from the results of the tension tests. When the Si content is in the range from 1.0 mass% to 2.0 mass%, then the Si added Al-5%Mg has the ability to be used for both die casting and sheet forming.

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

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.79.1156 ◽

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.264-265.1911 ◽

2011 ◽

Vol 264-265 ◽

pp. 1911-1916 ◽

Cited By ~ 6

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.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.146-147.1108 ◽

2010 ◽

Vol 146-147 ◽

pp. 1108-1113 ◽

Cited By ~ 3

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.

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