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Journal articles on the topic 'Twin rolls'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

S, Bondarenko, Grydin O, Oginskiy Yo, Kuzmina O, and Frolov Ya. "Device for twin-roll casting of strips with profiled cross-section." Theory and practice of metallurgy 1,2020, no. 1,2020 (124) (2020): 44–50. http://dx.doi.org/10.34185/tpm.1.2020.06.

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Goal. This article is devoted to the development of a new method of roll-crystallizers profiling for twin-roll casting in order to provide the possibility of manufacturing strips with variable geometry on width as one of the more widely used products in the world. Method. The proposed method of profiling is implemented by using profiling strips that cover one or both rolls-crystallizers. In this way achieved profiling of the surface of the cylindrical internally water-cooled rolls, which corresponds to the desired type of strips profiled cross-section. Research results. For the practical imple

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2

Park, Jong Jin. "Design of a Composite Roll with Internal Cooling Channels for Twin-Roll Casting." Materials Science Forum 765 (July 2013): 331–35. http://dx.doi.org/10.4028/www.scientific.net/msf.765.331.

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In twin-roll casting, the melt is cooled, solidified and rolled to a specific thickness only by the rolls and consequently a lot of heat is transferred from the melt to the rolls through the melt/roll interface. In a composite roll, consisting of a steel core and a copper-alloy sleeve, the heat is finally removed by cooling water flowing through internal cooling channels. In the present study, design of the channels was improved using finite-element analysis in the aspects of structural as well as fatigue strengths.

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3

Pei, Zhi Pu, Hong Yang Zhao, Xiao Dong Hu, and Dong Ying Ju. "Study on Molten Zone in Twin-Roll Casting of Magnesium Alloy Strip." Applied Mechanics and Materials 395-396 (September 2013): 209–13. http://dx.doi.org/10.4028/www.scientific.net/amm.395-396.209.

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Thermal flow finite element simulation was carried out to deeply understand the solidification and deformation phenomena of magnesium alloy in molten zone during twin-roll casting process. The results show that temperature near the nip of the rolls is about 680K based on current conditions, and there are two vortexes in the molten pool during casting, a peak formed at solidus. Due to the metal flows in molten pool and relative rotates of the rolls, temperature field of molten zone is different from normal casting, which will cause the solidification structure changes. An experiment by using a

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4

Kurz, Gerrit, Tom Petersen, Roland Hoppe, Jan Bohlen, and Dietmar Letzig. "Microstructure and Texture of MX20 after Conventional Rolling and Rolling from Twin Rolled Cast Strip." Materials Science Forum 941 (December 2018): 1418–23. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1418.

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Two main impediments are currenty discussed with respect to the industrial application of magnesium sheets. First, the low formability of magnesium sheets requires many rolling passes to roll cast slabs to final gauge, which leads, second, to high costs for the production of magnesium sheets. An alternative cost-saving process chain for magnesium sheets with enhanced properties is the feedstock production by twin roll casting (TRC). In the TRC process, liquid metal proceeds from a furnace over a pipe into a crucible and then flows between a pair of counter rotating, internally cooled rolls. Th

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5

Widiantara, I., Hae Yang, Muhammad Kamil, Dong Yoon, and Young Ko. "Grain Refinement by Extension Twin in Mg Alloy during Asymmetrical Rolling." Metals 8, no. 11 (2018): 891. http://dx.doi.org/10.3390/met8110891.

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The work looked into the grain refinement process of Mg alloy during asymmetrical rolling with a focus on the role of twin. The present sample was deformed at ambient temperature by single operation with the height reduction of 50% at the roll speed ratio of 1:4 for the upper and lower rolls having the same dimension. From the electron backscatter diffraction analysis in the surface region where intense shear strain was imparted, a number of { 10 1 ¯ 2 } extension twins with a width of ~1 µm were detected clearly in most of the deformed grains. Moreover, the average misorientation angle of the

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6

Haga, Toshio. "Twin Roll Caster for Clad Strip." Metals 11, no. 5 (2021): 776. http://dx.doi.org/10.3390/met11050776.

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Production of aluminum alloy clad strips requires many processes, and a reduction in the number of processes has long been demanded. A method to cast clad strips directly from molten metal using a twin roll caster with copper rolls is proposed in this work. Two types of twin roll casters were designed and tested. One was a vertical-type tandem twin roll caster and the other was a twin roll caster equipped with a scraper. The casting of the clad strips was conducted in an oxidizing atmosphere. The clad strips were cast at speeds higher than 15 m/min. This casting speed is much higher than that

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7

YAMAUCHI, Takashi, Takayuki NAKANORI, Morihiro HASEGAWA, Takashi YABUKI, and Nobuaki OHNISHI. "Characteristics of stainless steel strip cast by twin rolls." Transactions of the Iron and Steel Institute of Japan 28, no. 1 (1988): 23–27. http://dx.doi.org/10.2355/isijinternational1966.28.23.

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8

Zuhailawati, Hussain, Masyitah Mt Yusof, Anasyida Abu Seman, Indra Putra Almanar, and Brij Kumar Dhindaw. "The Role of Roller Speed on Solidification of Al-Mg-Si Alloy during Twin Roll Strip Casting." Materials Science Forum 819 (June 2015): 15–19. http://dx.doi.org/10.4028/www.scientific.net/msf.819.15.

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In the production of aluminum alloy strips for packaging industry twin roll strip casting technique is now being extensively employed. The twin roll caster has advantage of the energy saving, low cost equipment and rapid solidification. The present research aimed to investigate the microstructure and hardness of twin roll strip cast aluminum alloys strips by varying the speed of roller cast. Al-Mg-Si ingot was melt in an induction furnace. Once it melted, the liquid was poured into a crucible attached to a twin roller cast to maintain the liquid temperature at 700°C. Molten alloy was poured in

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9

Komeda, Kosuke, Ryoji Nakamura, and Shinji Kumai. "High Speed Twin-Roll Casting of Al-Mg Alloys." Advanced Materials Research 154-155 (October 2010): 1544–48. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.1544.

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The disadvantages of the conventional twin-roll caster for aluminum alloy are low casting speeds and limited choices of alloys that are castable by this processing. It is known that strip casting of aluminum alloy 5182 is very difficult because of their wider freezing zones. The vertical-type high-speed twin-roll caster used in the present study was devised to overcome these disadvantages. Features of the high speed twin roll casters are as below. Mild steel rolls were used in order to increase the casting speed and to be made at a lower equipment cost. Roll coating is produced in casting of A

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10

Zhang, Xiao Ming, Zheng Yi Jiang, Xiang Hua Liu, Guo Dong Wang, L. M. Yang, and A. Kiet Tieu. "Influence of Casting Speed on Temperature and Flow Fields in Molten Pool during Twin-Roll Strip Casting Process." Materials Science Forum 505-507 (January 2006): 1315–0. http://dx.doi.org/10.4028/www.scientific.net/msf.505-507.1315.

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In twin-roll strip casting process, the casting speed has a significant influence on the metal flow and temperature distribution in the molten pool, which will affect the stability of this process and the quality of the produced products. Based on a 3D coupled thermal-flow analysis, a combination of the experimental results for twin-roll strip casting of stainless steel, heat equilibrium calculation and simulation results was conducted, and the boundary conditions of the heat exchange between the rolls and molten pool has been treated effectively. The effect of the casting speed on the flow an

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11

Nakamura, Ryoji, Teppei Nakamura, Ryoji Nakamura, Hideto Harada, Shinji Kumai, and Hisaki Watari. "Roll Casting of Al-SiC_p Composite Strip." Advanced Materials Research 139-141 (October 2010): 481–84. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.481.

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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.

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12

Lee, Yun-Hoo, Bong-Hwan Koh, Heung Soo Kim, and Myung Ho Song. "Compressive Strength Properties of Natural Gas Hydrate Pellet by Continuous Extrusion from a Twin-Roll System." Advances in Materials Science and Engineering 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/207867.

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This study investigates the compressive strength of natural gas hydrate (NGH) pellet strip extruded from die holes of a twin-roll press for continuous pelletizing (TPCP). The lab-scale TPCP was newly developed, where NGH powder was continuously fed and extruded into strip-type pellet between twin rolls. The system was specifically designed for future expansion towards mass production of solid form NGH. It is shown that the compressive strength of NGH pellet strip heavily depends on parameters in the extrusion process, such as feeding pressure, pressure ratio, and rotational speed. The mechanis

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13

Grydin, Olexandr, Mykhailo Stolbchenko, Maria Bauer, and Mirko Schaper. "Asymmetric Twin-Roll Casting of an Al-Mg-Si-Alloy." Materials Science Forum 918 (March 2018): 48–53. http://dx.doi.org/10.4028/www.scientific.net/msf.918.48.

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The industrial application of high-alloyed Al-Mg-Si alloys for the production of thin strips by means of twin-roll casting is limited due to the structural inhomogeneity and segregation formation. To reach the highest mechanical properties of the finished product, a direct influence on the strip formation conditions during the twin-roll casting can be applied. Analogous to the asymmetric rolling process, additional shear stresses were created in the strip forming zone by using different circumferential velocities and torques of the caster rolls. To provide the asymmetric process conditions, on

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14

Vidoni, Michele, Markus Daamen, and Gerhard Hirt. "Advances in the Twin-Roll Strip Casting of Strip with Profiled Cross Section." Key Engineering Materials 554-557 (June 2013): 562–71. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.562.

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Direct thin strip casting is an economically end energetically smart process for the production of steel strip. In a single process step, liquid steel can be cast and directly rolled to hot strip in thicknesses ranging from one to four millimeters. With the use of specifically profiled casting rolls it is possible to produce strip with optimized cross-sections, allowing this process to compete with tailor welded and tailor rolled blanks for the production of a class of products already widely applied in industry. Numerical and experimental studies proved the feasibility of this concept and add

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15

Haga, Toshio, Takuya Yamashiki, Hisaki Watari, and Shinichi Nishida. "Burr Formation in Casting Using Vertical-Type High-Speed Twin-Roll Caster." Key Engineering Materials 846 (June 2020): 146–51. http://dx.doi.org/10.4028/www.scientific.net/kem.846.146.

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The mechanism and region of burr formation in casting using a vertical-type high-speed twin-roll caster were investigated using a side-dam plate with a window. A383, an aluminum alloy typically used for casting due to its excellent fluidity at semisolid condition was used. The solid fraction of the semisolid metal ejected from the window was low. When solid metal was ejected from the window, no burr formed. The results suggest that a burr formed when the semisolid metal was ejected in gap between the side-dam plate and the side surface of a roll. The semisolid metal was ejected near the point

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16

Nakamura, Ryoji, Masakazu Sawai, Ryoji Nakamura, Takanori Yamabayashi, Shinji Kumai, and Hisaki Watari. "Roll Casting of Three Layers Clad Strip." Key Engineering Materials 443 (June 2010): 128–33. http://dx.doi.org/10.4028/www.scientific.net/kem.443.128.

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A roll caster, which could cast the three layers of clad strip directly from the molten metal, was designed, assembled and tested. The base strip was AA3003 aluminum alloy and overlay strips were AA4045 aluminum alloy. An unequal diameter twin roll caster was modified to cast clad strip. Two small rolls were amounted on a large roll. A scraper plate was used to prevent the mixture of the different kinds of melts. The casting of three strips and the connecting of strips could be operated by one roll caster. The interfaces between the strips were clear, and the mixture of the melt did not occur.

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17

Junquera, Ana María Valdeón, Javier García González, Joaquín Manuel Villanueva Balsera, and Vicente Rodríguez Montequín. "A Wire Rod Rolling Mill Digital Twin for the Simulation of the Rolls Replacement Process." Proceedings 63, no. 1 (2020): 13. http://dx.doi.org/10.3390/proceedings2020063013.

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Smart Manufacturing is a goal to be achieved, and the most advanced manufacturing approaches are being used to pursue this objective. Within this context, industry development aims to attain an intelligent manufacturing using, for example, virtual models that simulate production lines. This paper presents the architecture of a Digital Twin for emulating the rolls replacement process within a wire rod rolling mill. The model is developed in Python, using a backtracking algorithm to select the suitable set of rolls as a first basic approach for the validation of the system. It may be used in the

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18

Bashmakov, D. A., D. I. Israphilov, and A. T. Galiakbarov. "Physical and Mathematical Foundations Describing Crystallization Process of Melt Cooling on a Moving Wall by Fourier Method and Duhamel Theorem." Solid State Phenomena 265 (September 2017): 1059–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.1059.

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The process of melt crystallization of the material in a twin-roll mold is considered. An adjoin of heat conduction through variable thickness of wall "rolls wall - hard layer" with a convective heat exchange from two sides problem important for the chemical industry is solved using Fourier method and Duhamel theorem. A theoretical dependence of the thickness of a frozen layer on the physical parameters of the melt and technological parameters of the crystallization process is obtained.

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19

HAGA, Toshio, Hideki INUI, Hiroshi SAKAGUCHI, Hisaki WATARI, Shinji KUMAI, and Kenta Suzuki. "727 Casting of aluminum alloy strip using a twin roll caster with 1500mm of diameter rolls." Proceedings of Conference of Kansai Branch 2006.81 (2006): _7–27_. http://dx.doi.org/10.1299/jsmekansai.2006.81._7-27_.

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20

Haga, Toshio, Kosuke Komeda, Kenta Mtsuoka, Shinji Kumai, and Hisaki Watari. "Effect of Si on AA5182 Strip Cast by a High Speed Twin Roll Caster." Applied Mechanics and Materials 184-185 (June 2012): 834–37. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.834.

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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 wa

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21

Zhu, Guang Ming, C. Zhang, P. G. Xu, and G. C. Bai. "Experimental Study on the Distribution of Heat Flux along Contact Arc in Twin-Roll Continuous Strip Casting." Key Engineering Materials 693 (May 2016): 761–66. http://dx.doi.org/10.4028/www.scientific.net/kem.693.761.

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Heat flux between molten metal and casting rolls plays a key role in improving the quality of the strip, studying on the interfacial heat flux has very important theoretical significance and practical value. According to the contact form and the heat flux characteristics of molten metal and casting rolls in twin-roll strip casting process, a set of measuring equipments has been developed, which are used to measure the heat flow of the interface between the molten metal and solid, and a relevant software system has been exploited to acquire and analyze the experiment data. Using the method of c

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22

Ju, Dong Ying, Xiao Dong Hu, and Hong Yang Zhao. "Experimental Study of In-Line Heat Treatment for Twin Roll Casting of Magnesium Alloy AZ31." Advanced Materials Research 15-17 (February 2006): 513–18. http://dx.doi.org/10.4028/www.scientific.net/amr.15-17.513.

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Strip casting is a promising route to directly produce magnesium alloy sheet by twin roll casting method. As-cast strips with proper microstructure and good surface quality are requested to serve as next rolling feedstock. In order to restrain the coarse dendrite growth and get uniform grain, a new method of in-line heat treatment was proposed. The as-cast strip was dipped into an oil tank after exiting the rolls and then was quenched with oil at various temperatures. The effect of oil temperature, casting speed and pouring temperature on microstructure and mechanical properties of cast strip

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23

Haga, Toshio, Takuya Yamashiki, Hisaki Watari, and Shinichi Niahida. "Investigation of Burr on Strips Cast by Vertical-Type High-Speed Twin Roll Caster." Key Engineering Materials 831 (February 2020): 40–45. http://dx.doi.org/10.4028/www.scientific.net/kem.831.40.

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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

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24

Eriksson, Maria, Han Goossens, and Ton Peijs. "Influence of the Solidification Process on the Mechanical Properties of Solid-State Drawn PCL/Sepiolite Nanocomposite Tapes." Fibers 8, no. 11 (2020): 70. http://dx.doi.org/10.3390/fib8110070.

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In this research, poly(ε-caprolactone) (PCL) was melt-mixed with sepiolite nanoclays in a twin-screw extruder. In a subsequent step, the extruded films were drawn in the solid state to highly oriented nanocomposite films or tapes. A twin-screw extruder equipped with a Sultzer mixer for improved mixing in combination with a bench top drawing unit was used to prepare oriented nanocomposite tapes of different sepiolite loading and draw ratios. In order to study the influence of the solidification step on the drawability of the materials, different cooling procedures were applied prior to drawing.

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25

Harada, Hideto, Shin Ichi Nishida, Mayumi Suzuki, Hisaki Watari, and T. Haga. "Direct Cladding from Molten Metals of Aluminum and Magnesium Alloys Using a Tandem Horizontal Twin Roll Caster." Applied Mechanics and Materials 772 (July 2015): 250–56. http://dx.doi.org/10.4028/www.scientific.net/amm.772.250.

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This paper describes direct cladding of magnesium (Mg) and aluminum (Al) alloys using a tandem horizontal twin roll caster that has three pairs of upper and lower rolls. Manufacturing conditions that are appropriate for fabricating Al/Mg and Al/Mg/Al cladded material were investigated. The surface condition of the cladded cast strip was examined. An electron probe micro analyzer was used to observe the interface between Al alloy and Mg alloy. The thickness of the mixed layer of Al and Mg alloy was 15μm, and how the materials were connected was clarified. Microscopic observation and backscatter

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26

Song, Ram, Yohei Harada, Shinji Muraishi, and Shinji Kumai. "Microstructural Evolution of Al-Mn Based Alloy Fabricated by Vertical-Type High-Speed Twin-Roll Casting." Materials Science Forum 877 (November 2016): 51–55. http://dx.doi.org/10.4028/www.scientific.net/msf.877.51.

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For decades, twin-roll casting has been applied for manufacturing aluminum alloy sheets. This conventional process contributes to make thin aluminum sheets from the molten metal directly. Recently, vertical-type high-speed twin-roll casting (HSTRC) has been developed with much higher casting speed rather than the horizontal-type. Some modifications such as feeding nozzle and water-cooling system of copper rolls contribute to increase cooling rates. This characteristic leads to many metallurgical advantages like grain refinement, super-saturation of alloying elements and fine distribution of se

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Watari, Hisaki, Yoshimasa Nishio, Ryoji Nakamura, Keith Davey, and Nobuhio Koga. "Microstructure and Mechanical Properties of High Aluminum Content Magnesium Alloys Fabricated by Twin-Roll Casting Process." Materials Science Forum 638-642 (January 2010): 1608–13. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.1608.

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This paper describes the twin roll casting technology of magnesium alloys that contains relatively high weight ratio of aluminum, such as AM60, AZ91 and AZ121. The cast magnesium alloy sheets were hot-rolled in an elevated temperature to investigate the appropriate hot-rolling conditions for producing high-quality strip using a purpose-built strip-casting mill. The influences of such process parameters as materials of roll, casting temperature, and roll speed are ascertained. A simple method of predicting the convection heat transfer coefficient between casting rolls and molten metal is introd

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Suzuki, Kenta, Shinji Kumai, Kenji Tokuda, et al. "Solidification Structure and Casting Defect in a High-Speed Twin-Roll Cast A6022 Aluminium Alloy with Various Fe Contents." Materials Science Forum 519-521 (July 2006): 1821–26. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.1821.

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Closed-loop recycling should be promoted for wrought aluminum alloy scraps including impurity iron in order to use natural resources effectively. Fabrication of the alloy strip using a high rate of cooling is a promising method for reducing the detrimental effects of impurity iron. In the present study, strips of A6022 aluminum alloy with various Fe contents of up to 1.5 mass% were fabricated by a vertical-type, high-speed, twin-roll caster. The caster used in the study was equipped with a pair of water-cooled, pure copper rolls, and a cooling slope upstream of the rolls. The strips exhibited

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29

Watari, Hisaki, Yoshimasa Nishio, Ryoji Nakamura, Keith Davey, and Nobuhio Koga. "Effect of Aluminum Content on Mechanical Properties of Cast Magnesium Alloy Sheets Fabricated by Twin-Roll Casting." Advanced Materials Research 97-101 (March 2010): 1077–80. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1077.

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This paper describes the twin-roll casting technology of magnesium alloys that contain relatively high weight ratios of aluminum, such as AM60, AZ91 and AZ121. The magnesium alloy sheets were cast by a vertical roll caster to manufacture relatively high-strength Mg alloys with high aluminum content. The influences of such process parameters as roll materials, casting temperature, and roll speed were ascertained. A simple method of predicting the convection heat transfer coefficient between casting rolls and molten metal is introduced. The microstructures of cast magnesium alloy sheets are micr

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Yamashiki, Takuya, and Toshio Haga. "705 Strip Casting of Aluminum Alloy Using a Vertical Type High Speed Twin Roll Caster with Grooved Rolls." Proceedings of Conference of Kansai Branch 2013.88 (2013): _7–5_. http://dx.doi.org/10.1299/jsmekansai.2013.88._7-5_.

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TODO, Kenji, Toshio HAGA, and Hisaki WATARI. "202 Trial manufacture of a vertical type high speed twin roll caster equipped with 1000mm of diameter rolls." Proceedings of the Materials and processing conference 2010.18 (2010): _202–1_—_202–3_. http://dx.doi.org/10.1299/jsmemp.2010.18._202-1_.

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Watari, Hisaki, Ryoji Nakamura, R. Paisern, Nobuhio Koga, and Keith Davey. "Mechanical Properties and Metallurgical Qualities of Magnesium Alloy Sheets Manufactured by Twin-Roll Casting." Key Engineering Materials 345-346 (August 2007): 165–68. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.165.

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This paper is concerned with a manufacturing process and technology to facilitate the economical manufacture of high-quality magnesium alloy sheets. Magnesium alloys AZ31, AZ61, AM60 and AZ91 were used to investigate the appropriate anufacturing conditions for use in twin-roll strip casting. Temperatures of the molten materials and roll speeds were varied to find the appropriate manufacturing conditions. The effects of manufacturing conditions on possible forming were clarified in terms of roll speeds and roll gaps between upper and lower rolls. In addition, microscopic observation of the micr

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33

Puchi-Cabrera, E. S. "Modeling Cold-Rolling Processes of Commercial Twin Roll Cast Aluminum Alloys." Journal of Engineering Materials and Technology 123, no. 2 (2000): 149–54. http://dx.doi.org/10.1115/1.1329873.

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Primary rolling operations of twin-roll cast commercial aluminum alloys can be designed more efficiently on the basis of maintaining a constant rolling load throughout the rolling program. The computation of the final thickness of the strip for every pass can be conducted by means of the simplified theory of Bland and Ford, assuming a constant rolling load during the rolling schedule. Particularly, for twin-roll cast Al-1 percent Mn alloy (TRC 3003) it is possible to reduce one rolling pass if the rolling load is kept constant at about 800 ton. The implementation of this design procedure requi

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Haga, Toshio, Tomoya Okada, Shinichi Nishida, and Hisaki Watari. "Effects of Nozzle and Roll on Surface Condition of Al-1%Si Strip Cast Using Vertical type High Speed Twin Roll Caster." Materials Science Forum 1042 (August 10, 2021): 53–59. http://dx.doi.org/10.4028/www.scientific.net/msf.1042.53.

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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,

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Yamashiki, Takuya, T. Haga, S. Kumai, and H. Watari. "Investigation of the Influence of the Roll Surface on the Cast Strip at the Casting Using a Vertical Type High Speed Twin Roll Caster." Applied Mechanics and Materials 184-185 (June 2012): 271–76. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.271.

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A vertical type high speed twin roll caster can be cast an aluminum alloy strip directly from a melt at high casting speed. However defects of the cast strip occurred at faster roll speed, which includes small cracks on the cast strip and unsoundness thickness distribution. They are related to contact condition of roll surface and melt. In the present study, a grooved roll was used to eliminate the defects and adopted in terms of the cost saving. We experimented using several grooved rolls with different patterns. When the groove width was 0.45mm; depth 0.2mm; pitch 0.1mm and 1.0mm, stable cas

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36

Goryczka, Tomasz. "Structure and Shape Memory Effect in Annealed Ni-Ti-Co Strip Produced by Twin Roll Casting Technique." Solid State Phenomena 154 (April 2009): 59–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.154.59.

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The ternary Ni47Ti50Co3 alloy was produced using twin rolls casting technique. The strip was annealed at 3000C, 4000C or 5000C for 1 hour. Annealing was carried out in real condition without protection atmosphere. The strips revealed a multi-stage martensitic transformation. However, the origin of this multi-stage transformation is different in the as-cast strip when compare to the thermally treated samples. Thermal treatment increases amount of preferentially oriented grains and in consequence higher degree of the shape recovery can be obtained.

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Ściężor, Wojciech, Andrzej Mamala, and Paweł Kwaśniewski. "Analysis of Properties of Selected Aluminium Alloys, Obtained by Twin Roll Casting Method and Subjected to Cold Rolling Process." Key Engineering Materials 641 (April 2015): 202–9. http://dx.doi.org/10.4028/www.scientific.net/kem.641.202.

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Modern manufacturing technologies of flat cold-rolled products made of aluminium and its alloys are based on raw materials produced with the use of continuous casting technology. One of the most frequently used integrated production processes, based on continuous casting of metal, is twin roll casting method (TRC). In TRC method liquid metal flows into the area formed by two water-cooled rolls, solidifies and next is deformed (rolled) which allows to obtain strip with several millimetres thickness. Thanks to this, it is possible to eliminate hot rolling stage from the typical production techno

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Li, Hong-wei, Guang-yi Ren, Zhi-jun Li, Lu Feng, and He Yang. "Forming mechanism and characteristics of a process for equal-thickness in-plane ring roll-bending of a metal strip by twin conical rolls." Journal of Materials Processing Technology 227 (January 2016): 288–307. http://dx.doi.org/10.1016/j.jmatprotec.2015.09.002.

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Goda, Tomoo, and Shinji Kumai. "Center Segregation and Cross-Hatched Surface Pattern of Vertical-Type High-Speed Twin-Roll Cast Al–Si–Mg Alloy Strip Formed by Wide Rolls." MATERIALS TRANSACTIONS 60, no. 8 (2019): 1643–50. http://dx.doi.org/10.2320/matertrans.f-m2019822.

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KAWACHI, Masayuki, Kazuyuki CHIYOTANI, and Shigeo ASAI. "Shape Control of Molten Metal Puddle by Directly Imposing Electric Field between Rolls and Magnetic Field in the Casting Direction in Twin Roll Process." Tetsu-to-Hagane 77, no. 9 (1991): 1434–41. http://dx.doi.org/10.2355/tetsutohagane1955.77.9_1434.

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KAWACHI, Masayuki, and Shigeo ASAI. "Shape Control of Molten Metal Puddle by Directly Imposing Electric Field in the Casting Direction and Magnetic Field between Rolls in Twin Roll Process." Tetsu-to-Hagane 78, no. 3 (1992): 455–62. http://dx.doi.org/10.2355/tetsutohagane1955.78.3_455.

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Hyrcza-Michalska, M., R. Kawalla, and J. Dembińska. "Drawability Studies of Magnesium Alloy Sheets at Elevated Temperature / Badania Tłoczności Blach Ze Stopów Magnezu W Podwyższonej Temperaturze." Archives of Metallurgy and Materials 60, no. 4 (2015): 2751–56. http://dx.doi.org/10.1515/amm-2015-0443.

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Abstract The paper presents the results of a study of drawability of thin AZ31 magnesium alloy metal sheets. These studies are a continuation of experiences in presenting the characteristics of technological plasticity of strips made of magnesium alloy which have been cast between rolls in vertical and horizontal systems called ‘twin-roll casting’. In the context of previous experiments conducted at the Institute of Material Technology of the Silesian University of Technology in cooperation with the Technical University - Bergakademie Freiberg (Germany), drawability of these strips at elevated

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Sidelnikov, Sergey, Roman Galiev, Andrey Bersenev, and Denis Voroshilov. "Application and Research Twin Roll Casting-Extruding Process for Production Longish Deformed Semi-Finished Products from Aluminum Alloys." Materials Science Forum 918 (March 2018): 13–20. http://dx.doi.org/10.4028/www.scientific.net/msf.918.13.

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At present, Russia is actively developing methods of combined treatment of aluminum alloys, one of which is the method of twin roll casting-extruding. It is very suitable for processing aluminum alloys having a relatively low melting point. The method consists in pouring a melt into the rotating rolls, crystallizing it on the roll surfaces, rolling with a predetermined reduction amount, pressing out in front of the die and squeezing out the product of the predetermined configuration and dimensions through it with drawing ratio in the range of values 10-40. Analysis of technical and economic in

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Nguyen, T. Ha, Ram Song, Yohei Harada, et al. "Microstructure and mechanical properties of high-manganese-containing high-speed twin-roll cast Al-Mn-Si alloy strips and their cold-rolled sheets." MATEC Web of Conferences 326 (2020): 06004. http://dx.doi.org/10.1051/matecconf/202032606004.

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Al-Mn based alloys with high-manganese content are expected to have improved mechanical properties due to solid solution hardening and/or dispersion hardening. However, the increase of Mn solubility of the alloy is difficult by using the conventional DC casting. In order to solve this problem, in the present study, we focused on the twin-roll casting method which is characterized by high cooling rates. Several kinds of high Mn-containing Al-Mn-Si alloy strips were fabricated by using a vertical-type high-speed twin-roll caster equipped with a pair of water-cooled copper rolls. Direct temperatu

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van Hoek, Hans, Jacques Noordermeer, Geert Heideman, Anke Blume, and Wilma Dierkes. "Best Practice for De-Vulcanization of Waste Passenger Car Tire Rubber Granulate Using 2-2′-dibenzamidodiphenyldisulfide as De-Vulcanization Agent in a Twin-Screw Extruder." Polymers 13, no. 7 (2021): 1139. http://dx.doi.org/10.3390/polym13071139.

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De-vulcanization of rubber has been shown to be a viable process to reuse this valuable material. The purpose of the de-vulcanization is to release the crosslinked nature of the highly elastic tire rubber granulate. For present day passenger car tires containing the synthetic rubbers Styrene-Butadiene Rubber (SBR) and Butadiene Rubber (BR) and a high amount of silica as reinforcing filler, producing high quality devulcanizate is a major challenge. In previous research a thermo-chemical mechanical approach was developed, using a twin-screw extruder and diphenyldisulfide (DPDS) as de-vulcanizati

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Ren, Xianwei, Yuanchun Huang, Yu Liu, Yongxing Zhao, and Hao Li. "Evolution of microstructure, texture, and mechanical properties in a twin-roll cast AA6016 sheet after asymmetric rolling with various velocity ratios between top and bottom rolls." Materials Science and Engineering: A 788 (June 2020): 139448. http://dx.doi.org/10.1016/j.msea.2020.139448.

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Vidoni, Michele, Arne Mendel, and Gerhard Hirt. "Profile Strip Casting with Inline Hot Rolling: Numerical Simulations for the Process Chain Design." Key Engineering Materials 611-612 (May 2014): 1568–75. http://dx.doi.org/10.4028/www.scientific.net/kem.611-612.1568.

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A process to produce thin steel strips with an optimized cross-section has been recently developed at the Institute of Metal Forming (IBF) as possible alternative to tailor welding and cold profile rolling for the production of tailored flat products. This process was named profile strip casting and combines the advantages of twin-roll strip casting, such as energy efficiency and compact production route, with the attractiveness of tailored products for lightweight applications. A finite difference model for the thermal description of the complete process chain including solidification, air co

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Phelan, Dominic, T. Zuidwijk, L. Strezov, Jilt Sietsma, and Rian Dippenaar. "Experimental Studies into Strip Casting of Steel." Materials Science Forum 539-543 (March 2007): 4155–60. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.4155.

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The strip casting of steel, whereby liquid steel is solidified between twin water cooled copper rolls directly into its final shape, is a radical, energy efficient, cost effective route for the production of steel products that also provides exciting opportunities for the development of new products. An experimental program is currently underway to study phenomena associated with rapid solidification of steel using levitating droplet techniques and Gleeble®3500 thermo-mechanical processing. For example, studies have been conducted to investigate the heat transfer, nucleation behaviour and micr

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Segal, Nancy L. "Remembering Irving I. Gottesman: Twin Research Colleague and Friend Extraordinaire/Research Studies: Face-Lift Technique Comparison in Identical Twins; Raising Preterm Twins; Fetal Behavior in Dichorionic Twin Pregnancies; Co-Bedding and Stress Reduction in Twins/Public Interest: Identical Co-Twins’ Same Day Delivery; Teaching Twins in Bosnia; Twin Auctioneers; Sister, the Play." Twin Research and Human Genetics 19, no. 6 (2016): 708–14. http://dx.doi.org/10.1017/thg.2016.87.

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Dr Irving I. Gottesman, a colleague, friend, and long-time member of the International Society of Twin Studies passed away on June 29, 2016. His contributions to twin research and some personal reflections are presented to honor both the man and the memory. This tribute is followed by short reviews of twin research concerning differences between cosmetic surgical techniques, the rearing of preterm twins, behavioral observations of dichorionic fetal twins, and the outcomes of co-bedding twins with reference to stress reduction. Interesting and informative articles in the media describe identica

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Ferreira, Lucas C., Jeffrey M. Craig, John L. Hopper, and Susan E. Carrick. "The Charles Perkins Centre's Twins Research Node." Twin Research and Human Genetics 19, no. 4 (2016): 393–96. http://dx.doi.org/10.1017/thg.2016.44.

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Twins can help researchers disentangle the roles of genes from those of the environment on human traits, health, and diseases. To realize this potential, the Australian Twin Registry (ATR), University of Melbourne, and the Charles Perkins Centre (CPC), University of Sydney, established a collaboration to form the Twins Research Node, a highly interconnected research facility dedicated specifically to research involving twins. This collaboration aims to foster the adoption of twin designs as important tools for research in a range of health-related domains. The CPC hosted their Twins Research N

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