Semisolid Strip Casting of Aluminum Alloy by a Twin Roll Caster Equipped with a Channel Scraper

2017 ◽  
Vol 748 ◽  
pp. 181-186
Author(s):  
Toshio Haga ◽  
Shinichi Nishida ◽  
Hisaki Watari
Keyword(s):  
Aluminum Alloy ◽  
Tensile Stress ◽  
Cold Rolling ◽  
Metal Layer ◽  
Strip Casting ◽  
Center Line ◽  
Cold Rolling And Annealing ◽  
Twin Roll Caster ◽  
Equiaxed Grain ◽  
Twin Roll

An unequal diameter twin-roll caster equipped with a channel scraper is proposed to improve center-line segregation. A semisolid metal layer was made by the channel scraper on the upper side of the strip and solidified by an upper roll. The twin-roll caster cast a strip of 5182 with equiaxed grain and without center-line segregation at a speed of 30 m/min and a unit roll load of 104 N/mm. The tensile stress and elongation after cold rolling and annealing were 294 MPa and 28%, respectively.

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

600 mm-Wide Strip Casting Using Single Roll Caster Equipped with Scraper

2019 ◽  
Vol 805 ◽  
pp. 43-49
Author(s):  
Toshio Haga
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Tensile Stress ◽  
Tension Test ◽  
Alloy Strip ◽  
Full Width ◽  
Striped Pattern ◽  
Wide Strip ◽  
Twin Roll Caster ◽  
Twin Roll

The casting of a 600 mm-wide 5182 aluminum alloy strip was attempted using a single-roll caster equipped with a scraper. This caster could cast a strip at speeds ranging from 10 to 40 m/min. These casting speeds are much higher than that of a conventional twin-roll caster. The scraper load suitable for scribing the wide strip was investigated. The strip could be scribed at full width by the scraper. The mechanical properties of the strip were investigated using a tension test and a cup test. The tensile stress was 320 MPa and the elongation was 30%. When deep drawing was conducted, no striped pattern, which occurs via segregation, appeared when both surfaces were facing outside.

Effect of Base Strip Temperature on Bonding of Three-Layer Clad Strip Cast by a Vertical-Type Tandem Twin Roll Caster

2018 ◽  
Vol 792 ◽  
pp. 8-15
Author(s):  
Toshio Haga ◽  
Kentaro Okamura ◽  
Hisaki Warari ◽  
Shinichi Nishida
Keyword(s):  
Shear Stress ◽  
Aluminum Alloy ◽  
Cold Rolling ◽  
Shear Test ◽  
Tensile Shear ◽  
Bonding Condition ◽  
Strip Cast ◽  
Twin Roll Caster ◽  
Twin Roll

The effect of the base strip temperature on the bonding between base strip and overlay strips in a three-layer clad strip cast by a vertical-type tandem twin roll caster was investigated. The base strip was 3003 aluminum alloy and the overlay strip was 4045 aluminum alloy. The bonding was investigated for base strip temperatures ranging from 200 °C to 550 °C. The bonding condition was investigated by cold-rolling, bending-to-failure test and tensile shear test. The shear stress increased with the base strip temperature. Sound bonding was achieved at base strip temperatures higher than 450 °C. The results of this study indicated that the second caster is not required to be set below the first roll caster.

Roll Casting of Al-SiCp Strip

2010 ◽  
Vol 654-656 ◽  
pp. 978-981 ◽  
Author(s):  
Ryoji Nakamura ◽  
Teppei Nakamura ◽  
Sinji Kumi ◽  
Hisaki Watari
Keyword(s):  
Aluminum Alloy ◽  
Cold Rolling ◽  
Hot Rolling ◽  
High Speed ◽  
Energy Savings ◽  
Low Thermal Expansion ◽  
Roll Casting ◽  
Eutectic Si ◽  
Cold Rolling And Annealing ◽  
Twin Roll

Al-SiCp aluminum alloy has some useful advantages i.e., low thermal expansion, better thermal conductivity and wear resistant. Recently, plates of Al-SiCp with thickness less than 1mm was demanded. The Al-SiCp is hard and brittle. Therefore, only hot rolling was a useful process to make thin plate. In the present study, roll casting of Al-SiCp strip was tried by a vertical type high speed twin roll caster to evaluate energy savings. The Al-SiCp strip, with thickness about 2mm, was cast directly from the molten metal. The particles of SiC were dispersed uniformly. The as-cast Al-SiCp could be coiled. The roll cast Al-SiCp had superior ductility. For this reason, the eutectic Si in matrix aluminum alloy (Al-Si alloy) became fine and globular. Cold rolling could be operated after 1-pass of hot rolling. The 1mm-thick Al-SiCp plate could be made by one-pass of hot rolling and 3-passes of cold rolling and annealing from as-cast strip.

Thermomechanical Treatment of Aluminum Alloy Fin Stock for Heat Exchanger Produced by Twin Roll Strip Casting Process

2010 ◽  
Vol 638-642 ◽  
pp. 241-246 ◽  
Author(s):  
Suk Bong Kang ◽  
Dong Bae Kim ◽  
Sang Su Jung ◽  
Kwang Jun Euh
Keyword(s):  
Thermal Conductivity ◽  
Aluminum Alloy ◽  
Heat Exchanger ◽  
Cold Rolling ◽  
Heat Exchangers ◽  
Casting Process ◽  
Strip Casting ◽  
Manufacturing Cost ◽  
Intermediate Annealing ◽  
Twin Roll

Aluminum alloys are commonly used as a material for heat exchangers due to their higher thermal conductivity and specific strength among various metallic materials. The lightweightening heat exchangers for automobile application are requisite for reducing the evolution of CO2 and improving the efficiency of fuel. The twin roll strip casting process is considered to produce the high quality and low manufacturing cost aluminum alloy fin stock for automobile heat exchangers. Thermomechamical treatment has carried out to obtain optimum processes for initial cold rolling, intermediate annealing and final cold rolling, which can meet the requirements for high strength and high thermal conductivity after brazing heat treatment. Mechanical properties and thermal condutivity have been evaluated before and after simulated brazing process. The nuclei of recrystallization might be formed along shear deformation bands during initial cold rolling and should be grown during intermediate annealing to enhance the permeation of molten brazings for the following brazing process. Final cold rolling has allowed strain hardening and controlling of sagging amount as fin stock materials of heat exchanger. In the present study the suitable thermomechnical treatment was suggested to balance the properties of strength, thermal conductivity, brazing behavior and sagging in Al-Fe-Mn-Si-Zn based alloys produced by twin roll strip casting process.

scholarly journals High Speed Roll Caster for Aluminum Alloy

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 520
Author(s):  
Toshio Haga
Keyword(s):  
Thermal Conductivity ◽  
Aluminum Alloy ◽  
Copper Alloy ◽  
High Speed ◽  
The Other ◽  
Center Line ◽  
Cast Strip ◽  
Roll Casting ◽  
Twin Roll Caster ◽  
Twin Roll

Two types of high-speed twin-roll casters and a single-roll caster equipped with a scraper were proposed. One of the twin-roll casters is a vertical-type high-speed twin-roll caster, and the other twin-roll caster is an unequal-diameter twin-roll caster. The vertical-type high-speed twin-roll caster can cast strip at speeds of up to 120 m/min. The unequal-diameter twin-roll caster casts strip at speeds up to 60 m/min. The unequal-diameter twin-roll caster is superior to the vertical-type high-speed twin-roll caster at the point of conveyance of the cast strip. A single-roll caster equipped with a scraper can cast strip without center-line segregation at speeds of up to 40 m/min. The use of a copper alloy roll and the non-use of a parting material enable high-speed roll casting. Since the roll loads of these casters are smaller than 0.1 kN/mm, soft copper alloy roll can be used. The strip does not stick to the roll without the parting material because of the use of the copper alloy roll with high thermal conductivity and the small roll load. The cooling rate near the surface is higher than 2000 °C/s.

scholarly journals 728 Strip Casting of A5182 Aluminum Alloy by an unequal diameter twin roll caster

2006 ◽  
Vol 2006.81 (0) ◽  
pp. _7-28_
Author(s):  
Hideki INUI ◽  
Toshio HAGA ◽  
Hiroshi SAKAGUCHI ◽  
Shinji KUMAI ◽  
Kenta SUZUKI ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Strip Casting ◽  
Twin Roll Caster ◽  
Twin Roll
Sign in / Sign up

Export Citation Format

Share Document