Clad Strip Casting by a Roll Caster

2011 ◽  
Vol 52-54 ◽  
pp. 755-758 ◽  
Author(s):  
Toshio Haga ◽  
Ryoji Nakamura ◽  
Sinji Kumi ◽  
Hisaki Watari
Keyword(s):  
Strip Casting ◽  
Roll Speed ◽  
Melt Temperature ◽  
Cold Rolled ◽  
Twin Roll

Casting of clad strip, which was one of the composite alloys, was tried using a roll caster. A vertical tandem type twin roll casters for clad strip were designed and assembled to cast the clad strip. Three layers of clad strip could be cast. The interface between the base strip and overlay strip was clear. The as-cast clad strip could be cold rolled without peeling at the interface. The element of the each strip did not diffuse to another strip at the interface. The effects of the roll speed and melt temperature of the overlay strip on the cladding of the strip were investigated.

Casting of Al-Mg Strip Using Single Roll Caster Equipped with a Scraper

2021 ◽  
Vol 880 ◽  
pp. 49-56
Author(s):  
Toshio Haga ◽  
Kosuke Tsukuda ◽  
Keisuke Oida ◽  
Hisaki Watari ◽  
Shinichi Nishida
Keyword(s):  
Molten Metal ◽  
Thickness Distribution ◽  
Surface Characteristics ◽  
Strip Thickness ◽  
Optimal Conditions ◽  
Roll Speed ◽  
Pouring Temperature ◽  
Strip Cast ◽  
Cold Rolled ◽  
Twin Roll

A scraper was attached to an unequal-diameter twin-roll caster without requiring large modifications. This caster was used as a 1000 mm diameter single roll caster equipped with a scraper, and its strip casting ability was tested. The effects of the scraper angle and load, the roll speed, and the pouring temperature of the molten metal on the scribed surface, thickness distribution and average strip thickness were investigated. The scribed surface characteristics were sound and the thickness distribution was flat when the scraper angle was 60° and the scraper load was in the range of 1 to 4 kg. When the scraper load was more than 1 kg, the thickness distribution was uneven. The average strip thickness decreased as the roll speed increased. The pouring temperature of the molten metal influenced the evenness of the solidified layer thickness. The solidified layer became even as the molten metal temperature was decreased. A strip cast with the determined optimal conditions was then cold rolled down to 1 mm to improve its surface quality.

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.

Twin Roll Casting of Copper Alloy C19210 Using Commercial Scale Machine

2020 ◽  
Author(s):  
Shogo Imai ◽  
Shinichi Nishida ◽  
Kyohei Ogawa ◽  
Makoto Hagiwara ◽  
Daichi Uematsu ◽  
...  
Keyword(s):  
Copper Alloy ◽  
Strip Casting ◽  
Roll Speed ◽  
Release Agent ◽  
Metallic Luster ◽  
Twin Roll Casting ◽  
Commercial Scale ◽  
Roll Casting ◽  
Rolling Load ◽  
Twin Roll

Abstract Copper alloy C19210 have excellent corrosion resistance, heat resistance, and conductivity, and is used for precision electronic parts such as lead frame materials. Conventionally, copper alloy strips are manufactured by repeating heat treatment and cold rolling, and have a problem that it is multi-process and production cost is expensive. On the other hand, twin roll casting can improve the above problems because strips are made directly from molten metals. In this study, twin roll strip casting of copper alloy C19210 using commercial scale machine was operated. The aims of this study is to investigate the possibility of strip casting for copper alloy. The effect of the side dam and release agent was researched. The effect of rolls speed on the strip surface condition was researched. The improved side dam prevented molten metal leakage. The release agent prevented sticking of the manufactured strip to the roll surface. The strip produced at roll speed of 7 m/min and 10 m/min had a lot of metallic luster. Moreover, the strip produced at roll speed of 7 m/min had more metallic luster than the strip produced at roll speed of 10 m/min. The lower the roll speed is, the greater the rolling load is. At a roll speed of 7 m / min, the rolling load became the maximum rolling load of the equipment. For producing strips with copper alloy C19210, higher rolling loads are preferred.

Clad Strip Casting Using a Twin Roll Casters

2011 ◽  
Vol 189-193 ◽  
pp. 4037-4040
Author(s):  
Ryoji Nakamura ◽  
Toshio Haga ◽  
H. Tsuge ◽  
S. Kumai ◽  
H. Watari
Keyword(s):  
Molten Metal ◽  
Liquidus Line ◽  
Strip Casting ◽  
Melt Temperature ◽  
Twin Roll Caster ◽  
Twin Roll

The three layers clad strip was fabricated by a vertical type tandem twin roll caster for clad strip (VTTCC). The effect of the casting conditions of the base strip and the overlay strip on the interface between the base strip and the overlay strip was investigated. The temperature of the molten metal and roll-load were investigated casting conditions. Base strip was AA8079 and overlay strip was AA6022. The proper melt temperature of the overlay strip was around the liquidus line of the base strip. The proper roll-load, which was smaller than rolling, was existed.

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.

Effect of Rolling Speed on Microstructure of Al-33wt. % Cu Alloy Strip Prepared by Twin Roll Strip Casting

2012 ◽  
Vol 710 ◽  
pp. 192-196
Author(s):  
Seshadev Sahoo ◽  
Sudipto Ghosh
Keyword(s):  
Lamellar Microstructure ◽  
Rolling Speed ◽  
Strip Casting ◽  
Alloy Strip ◽  
Roll Speed ◽  
Cast Sample ◽  
Cu Alloy ◽  
Wavy Structure ◽  
Twin Roll ◽  
Scanning Electron

Microstructural evolutions of Al-33wt. % Cu alloy strip, prepared by twin roll strip casting (TRC) at different roll speed (100-500 rpm) were studied in the present investigation. The as cast sample were subjected to Scanning Electron Microscope (SEM) to study the effect of rolling speed on microstructure along the thickness of the strip. The microstructure shows that Al-33 wt. % Cu strip is a layered structure which consists of partly lamellar and wavy structure. The lamellar microstructure consists of alternating layers of well bonded α-Al phase and θ-Al2Cu phase.

Strip Casting of Al-25%Si Alloy

2012 ◽  
Vol 430-432 ◽  
pp. 669-672
Author(s):  
Toshio Haga ◽  
Hideto Harada ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Strip Casting ◽  
Rolled Strip ◽  
Thickness Direction ◽  
Cast Strip ◽  
Primary Si ◽  
Eutectic Si ◽  
Cold Rolled ◽  
Twin Roll Caster ◽  
Hot Rolled ◽  
Twin Roll

Strip casting of Al-25%Si strip was tried using an unequal diameter twin roll caster. The diameter of the lower roll (large roll) was 1000mm and the diameter of the upper roll (small roll) was 250mm. Roll material was mild steel. The sound strip could be cast at the speeds ranging from 8 m/min to 12 m/min. The strip did not stick to the roll without the parting material. The primary Si, which existed at centre area of the thickness direction, was larger than that which existed at other area. The size of the primary Si was smaller than 0.2 mm. Eutectic Si was smaller 5μm. The as-cast strip was ranging from 2mm to 3mm thick and its width was 100mm. The as-cast strip could be hot rolled down to 1mm. The hot rolled strip was cold rolled. The primary Si became smaller and the pore occurred around the primary Si after the rolling.

Roll Casting of Clad Strip

2012 ◽  
Vol 706-709 ◽  
pp. 1152-1157 ◽  
Author(s):  
Toshio Haga ◽  
Ryoji Nakamura ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Aluminum Alloy ◽  
Roll Speed ◽  
Experimental Conditions ◽  
Melt Temperature ◽  
Roll Casting ◽  
Continuous Bending ◽  
Twin Roll

Roll caster to cast a three layers clad strip was invented and effect of casting conditions on the clad strip was investigated. Two vertical type twin roll casters were set at vertically tandem position to cast three layers clad strip. Roll speed, roll load (separating force), melt temperature and elements of the aluminum alloy were chosen as the experimental conditions to be investigated. The roll load (separating force) and elements of aluminum alloy were important factors to cast sound clad strip. The clad strip could be cast at the speeds up to 40m/min. Interface between the strips were clear and elements of each strip did not diffuse to other strip. The clad strip was not peeled off at the interfaces by continuous bending. Strips were strictly connected at the interfaces.

scholarly journals Determination of Roll Speed in Twin Roll Strip Casting.

1996 ◽  
Vol 62 (601) ◽  
pp. 3684-3690
Author(s):  
Masanori SHIOMI ◽  
Ken-ichiro MORI ◽  
Kozo OSAKADA
Keyword(s):  
Strip Casting ◽  
Roll Speed ◽  
Twin Roll

Roll Casting of a Wire Inserted Strip

2011 ◽  
Vol 299-300 ◽  
pp. 774-777
Author(s):  
Toshio Haga ◽  
Kenta Takahashi ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Matrix Alloy ◽  
Interval Matrix ◽  
Roll Speed ◽  
Melt Temperature ◽  
Roll Casting ◽  
Twin Roll Caster ◽  
The Wire ◽  
Minimum Interval ◽  
Twin Roll

Casting of a wire-inserted strip was tried by a downward melt drag twin roll caster. Some numbers of wires of 0.3 mm diameter were inserted. Effects of the wire-interval, matrix alloy and melt temperature on the ability of the insertion of the wire were investigated. Minimum interval of the wire, with which the insertion of the wires was able, was 1.6 mm. Insertion of the wire became easy as the roll speed becomes higher. Superheat of the melt was not important factor for the insertion of the wire.

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