scholarly journals MODELING OF ROLL CASTING AND ROLLING OF METALS

2021 ◽  
pp. 25-32
Author(s):  
А. С. Нурадинов ◽  
Н. С. Уздиева ◽  
С. С-С. Ахтаев ◽  
М. Р. Исаева
Keyword(s):  
Casting Process ◽  
Rolling Process ◽  
Rolling Speed ◽  
Casting Plant ◽  
Technological Parameters ◽  
Modeling Methods ◽  
Roll Casting ◽  
The Stability ◽  
The Mathematical Model

В данной работе представлены результаты изучения процесса валковой разливки с применением методов физического и математического моделирования. Показано, что стабильность процесса валковой разливки-прокатки металлов зависит от таких технологических параметров, как температура перегрева, скорость разливки и уровень расплава в межвалковом пространстве. Для использованных в процессе исследования сплавов получены зависимости оптимальной скорости разливки-прокатки от толщины полосы, угла мениска металла, радиуса валков и температуры перегрева расплавов.Экспериментальная составляющая данных исследований, выполненная в лабораторных условиях на установке валковой разливки металлов, подтвердила адекватность и высокое качество расчетных режимов разливки для всех изучаемых сплавов. Полученная для описания изучаемых процессов валковой разливки металлов математическая модель показала высокую корреляцию теоретических и экспериментальных данных, что свидетельствует о корректности данной модели. This paper presents the results of studying the roll casting process using physical and mathematical modeling methods. It is shown that the stability of the roll casting-rolling process of metals is provided by such technological parameters as the overheating temperature, the casting speed and the melt level in the inter-roll space. For the alloys used in the study, the dependences of the optimal casting-rolling speed on such technological indicators as the thickness of the strip, the angle of the metal meniscus, the radius of the rolls and the temperature of overheating of the melts were obtained. The experimental component of these studies, performed under laboratory conditions at the roll casting plant of metals, confirmed the adequacy and high quality of the calculated casting modes for all the studied alloys. The mathematical model obtained to describe the studied processes of roll casting of metals showed a high correlation of theoretical and experimental data.

Flow and Temperature Analysis of Molten Pool in Twin-Roll Strip Casting Process

2007 ◽  
Vol 340-341 ◽  
pp. 695-700 ◽  
Author(s):  
Xiao Ming Zhang ◽  
Zheng Yi Jiang ◽  
L.M. Yang ◽  
Xiang Hua Liu ◽  
Guo Dong Wang
Keyword(s):  
Molten Pool ◽  
Metal Flow ◽  
Casting Process ◽  
Strip Casting ◽  
Roll Casting ◽  
Quality Of Products ◽  
The Stability ◽  
Experimental Values ◽  
Twin Roll

In twin-roll strip casting process, metal flow and temperature distribution in the molten pool directly affect the stability of the process and the quality of products. In this paper, a 3D coupling temperature-flow finite element simulation during twin-roll strip casting has been carried out, and the influences of the outlet angle and the submerged depth on the temperature and flow fields in the molten pool were investigated for the twin-roll casting of stainless steel. An inverse method was used to determine the boundary conditions between the roll and molten pool. Simulation results are consistent with the experimental values. Numerical simulation is helpful to optimise the twin-roll strip casting process and to improve the quality of products in practice.

scholarly journals Asymmetric Twin-Roll Casting of an Al-Mg-Si-Alloy

2018 ◽  
Vol 918 ◽  
pp. 48-53 ◽  
Author(s):  
Olexandr Grydin ◽  
Mykhailo Stolbchenko ◽  
Maria Bauer ◽  
Mirko Schaper
Keyword(s):  
Mechanical Properties ◽  
Casting Process ◽  
Rolling Process ◽  
Age Hardening ◽  
Process Conditions ◽  
Shear Stresses ◽  
Asymmetric Rolling ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

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, only one caster roll was left driven and the second one was left idling during the casting process. The microstructure and the mechanical properties of the strips in the as-cast state as well as after the homogenization and subsequent age-hardening were analyzed. A comparison of the test results showed a positive influence of the asymmetry conditions on the strips’ properties.

scholarly journals The Influence of Different Assist Gases on Ductile Cast Iron Cutting by CO2 Laser

2017 ◽  
Vol 17 (4) ◽  
pp. 109-114 ◽  
Author(s):  
J. Meško ◽  
R. Nigrovič ◽  
A. Zrak
Keyword(s):  
Cast Iron ◽  
Laser Cutting ◽  
Roughness Parameter ◽  
Cutting Speed ◽  
Nodular Cast Iron ◽  
Ductile Cast Iron ◽  
Engineering Practice ◽  
Technological Parameters ◽  
The Stability

Abstract This article deals with the technology and principles of the laser cutting of ductile cast iron. The properties of the CO2 laser beam, input parameters of the laser cutting, assist gases, the interaction of cut material and the stability of cutting process are described. The commonly used material (nodular cast iron - share of about 25% of all castings on the market) and the method of the laser cutting of that material, including the technological parameters that influence the cutting edge, are characterized. Next, the application and use of this method in mechanical engineering practice is described, focusing on fixing and renovation of mechanical components such as removing the inflow gate from castings with the desired quality of the cut, without the further using of the chip machining technology. Experimental samples from the nodular cast iron were created by using different technological parameters of laser cutting. The heat affected zone (HAZ), its width, microstructure and roughness parameter Pt was monitored on the experimental samples (of thickness t = 13 mm). The technological parameters that were varied during the experiments included the type of assist gases (N2 and O2), to be more specific the ratio of gases, and the cutting speed, which ranged from 1.6 m/min to 0.32 m/min. Both parameters were changed until the desired properties were achieved.

Texture Evolution in Non-Oriented Silicon Steel Processed by Twin-Roll Casting

2012 ◽  
Vol 452-453 ◽  
pp. 7-11 ◽  
Author(s):  
Wei Pei ◽  
Yu Hui Sha ◽  
Fang Zhang ◽  
Liang Zuo
Keyword(s):  
Cold Rolling ◽  
Texture Evolution ◽  
Casting Process ◽  
Rolling Process ◽  
Silicon Steel ◽  
Recrystallization Annealing ◽  
Twin Roll Casting ◽  
Steel Sheets ◽  
Roll Casting ◽  
Twin Roll

In this paper, non-silicon steel sheets were produced by both twin-roll casting method and conventional process. Orientation characteristics and texture evolution of the sheets during casting, cold rolling and recrystallization annealing were investigated for comparison. It was found that the subsurface of twin-roll casting strips are characterized by weak {100} orientation while the central layer by random orientation. Twin-roll casting process can decrease α fiber (//RD) and increase γ fiber (//ND) during cold rolling process. Consequently, the η fiber (//RD) favorable for magnetic properties of non-silicon steels is enhanced and the detrimental {111} component is suppressed after annealing.

scholarly journals INVESTIGATION OF THE INFLUENCE OF PRESSING BELTS TENSION OF THE BACK CIRCUIT OF PRESS - SELECTIVE PR-1.5

2018 ◽  
Vol 13 (2) ◽  
pp. 76-76
Author(s):  
Валерий Белов ◽  
Valeriy Belov ◽  
Леонид Рыбаков ◽  
Leonid Rybakov ◽  
Светлана Овчукова ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Experimental Studies ◽  
Field Research ◽  
Test Protocol ◽  
Optimal Value ◽  
The Stability ◽  
The Moment ◽  
The Mathematical Model ◽  
Elastic Characteristics

A brief analysis of suspension mechanisms and ways to improve the quality of press harvesting for flax harvesting is considered. By researching the mathematical model, the authors prove the possibility of increasing the stability of the elastic characteristics of the suspension mechanisms by changing the angle between the levers or changing the geometry of the structure, for example, the attachment point of a two-arm lever. Particular attention is drawn to the new term “reduced rigidity” of the suspension mechanism. Using this notion and the method of its determination, the authors recommend determining the optimal value of the reduced stiffness of the suspension in the way of mathematical modeling and using this indicator as the main optimization parameter. The results of theoretical and experimental studies were presented by the authors in the form of elastic characteristics of the suspension mechanisms. When conducting a study of the mathematical model, it is suggested to take into account the condition of equality of the maximum values of the moments of forces from the action of the tension forces of the belts or the mass of the working element and the moment of forces acting on the side of the tension springs. During the research of the suspension mechanism, the actual dimensions of the PR-1.5 baler design were adopted. At the same time, we briefly describe the design of the improved tensioning mechanism of a baler for flax harvesting. A rather detailed analysis is given by the authors of the obtained elastic characteristics of the suspension mechanism. Some new features of the elastic characteristics of the suspension mechanism that have not been previously detected are described. To confirm the correctness of the reasoning, the authors implemented their research in a real press-picker and conducted field research that confirmed the possibility of improving the quality of the upgraded version of the machine. To confirm the results of the research, the authors presented a fragment of the field test protocol. The task is solved, uniformity of the roll density is ensured and its density is increased.

Research into the Effect of Speed Mismatch during Continuous Rolling on the Process Parameters

2021 ◽  
Vol 316 ◽  
pp. 208-213
Author(s):  
Sergey O. Nepryakhin ◽  
Olga V. Vodopyanova
Keyword(s):  
Rolling Process ◽  
Rolling Speed ◽  
Continuous Rolling ◽  
Technological Parameters ◽  
Wire Mill ◽  
Small Deviations ◽  
Simulation Results ◽  
Rolling Torque ◽  
3D Software ◽  
Deform 3D

The paper analyzes the influence of tension (dam) on the technological parameters of the rolling process (spreading, force and rolling torque). For the analysis, a model of continuous rolling in three adjacent stands was developed, using the Deform 3D software. The adequacy of the model was confirmed by comparing the experimental data from the small-section wire mill 150 and the simulation results. The error in determining the forming was 0.4%, and in determining the power parameters was 11%. Further, a computational experiment was planned, to identify the effect of mismatched of rolling speeds on technological parameters. According to the results of calculations, graphs of changes in technological parameters were constructed. It is established that, even small deviations of rolling speed from the matched mode lead to significant changes in technological parameters.

Influence of Casting Speed on Temperature and Flow Fields in Molten Pool during Twin-Roll Strip Casting Process

2006 ◽  
Vol 505-507 ◽  
pp. 1315-0
Author(s):  
Xiao Ming Zhang ◽  
Zheng Yi Jiang ◽  
Xiang Hua Liu ◽  
Guo Dong Wang ◽  
L.M. Yang ◽  
...  
Keyword(s):  
Casting Speed ◽  
Molten Pool ◽  
Metal Flow ◽  
Flow Analysis ◽  
Casting Process ◽  
Strip Casting ◽  
The Stability ◽  
Twin Roll ◽  
Temperature And Flow Fields

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 and temperature in the molten pool was given. Simulation result is in agreement with the measured value.

Numerical Simulation on the Microstructure of Small Electroslag Remelting Ingot

2011 ◽  
Vol 117-119 ◽  
pp. 1740-1743
Author(s):  
Jun Ping Yao ◽  
Zhong Sun
Keyword(s):  
Heat Transfer ◽  
Radial Direction ◽  
Casting Process ◽  
Electroslag Remelting ◽  
Metal Pool ◽  
Technological Parameters ◽  
Pool Profile ◽  
Columnar Grain ◽  
Grain Size And Orientation

The technological parameters determine the metal pool profile and the grain size and orientation in the electroslag remelting process, and thus affect the quality of the final ingot. The microstructure in the small electroslag casting process was simulated by CA method by means of the software MATLAB. Along with the remelting process, the columnar grain begins to grow to certain angle with axles, the shape of the metal pool gets closer to paraboloid shape. Improving the slag pool temperature or increasing the coefficient of heat transfer at the bottom or decreasing the coefficient of heat transfer at the side can lead the axial trend of grain growing to increase and the depth of the pool to shallow, otherwise can lead the trend of grain growing to radial direction to increase and the depth of the pool to deep.

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