• Title/Summary/Keyword: High Speed Continuous Casting

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Design of hybrid-type fuzzy controller for stabilizing molten steel level in high speed continuous casting (연주 탕면레벨 안정화를 위한 하이브리드형 퍼지제어기 설계)

  • 이덕만;권영섭;이상호
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.67-67
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    • 2000
  • In this paper, a hybrid type fuzzy controller is proposed to maintain molten steel level stable and reliable manner in high speed continuous casting regardless of various disturbances such as casting speed change, tundish weight variation, 치ogging/undoning of SEN(Submerged Entry Nozzle), periodic bulgings, etc. To accomplish this purpose, hardware filter and software filer are carefully designed to eliminate high frequency noise and to smooth input signals from harsh environments. In order to minimize the molten steel level variations from various disturbances the controller uses hybrid type control term: fuzzy logic term, proportional term, differential term and nonlinear feedback compensation tenn. The proposed controller is applied tn commercial mini-mill plant and shows considerable improvement in minimizing the molten steel variation.

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Load Sharing Control of Driven Roll in Continuous Caster (연속주조기에서 스트랜드 구동롤의 인발력 분배 제어)

  • 천창근;김철우
    • The Transactions of the Korean Institute of Power Electronics
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    • v.8 no.4
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    • pp.321-327
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    • 2003
  • As the continuous casting process is to product slab with high temperature liquid steel, the main role of strand driven roll is to withdraw slab from mold as operator set up casting speed pattern. The strand driven roll in old cast machine is controlled casting speed only. Due to inaccuracies in drive setting up, varying roll diameters, bulging in the product, withdrawal force was distributed irregularly. As a result, because of horizontal crack in slab comer, high casting speed can't be achieved. In this paper, the correlation between the distribution of withdrawal force and slab quality is investigated and the new control algorithm which can be distributed regularly the withdrawal force of strand driven roll is proposed. The principle of proposed algorithm is not to control motor torque directly but to control motor speed reference according to sharing ratio of withdrawal force which is set up in high level controller. The proposed algorithm implemented in POSCO Kwangyang 1-4 continuous casting plant.

Thermal Behavior Analysis in Continuous Bloom Casting Mold (Bloom용 연속주조 몰드의 열거동 해석)

  • 정영진;김성훈;김영모;강충길
    • Transactions of Materials Processing
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    • v.13 no.4
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    • pp.319-325
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    • 2004
  • Continuous casting machine has been experienced a rapid development to increase productivity with high casting speed and to meet consumer's strict demands for high quality. However, because most of defects and cracks are initially formed in mold and grown into surface cracks during the post process, more specific and clear investigations upon heat transfer mechanism between mold and solidified shell are necessarily needed. In this study heat transfer coefficients which shows the characteristic of heat transfer mechanism are calculated with temperatures measured in bloom mold using optimal algorithm, and thermal analysis are investigated using the calculated heat transfer coefficients. Finally uniformity of solidified shell is investigated for high carbon steel, 0.187%C from thermal analysis.

Mold Level Stabilization of Continuous Steel Casting Systems Using a Variable Disturbance Observer (가변외란관측기를 이용한 연주시스템의 몰드 레벨 안정화)

  • Sohn, Myung-Gong;Son, Cheon-Don;Kim, Goo-Hwa;Lee, Duk-Man;Kwon, Sung-Ha;Jeung, Eun-Tae
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.2
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    • pp.105-110
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    • 2008
  • This paper presents a control method to maintain stable mold level for unsteady bulging in high speed casting. The stabilizing mold level is an important factor to get high quality products. But, for various reasons, there are several disturbance factors which make mold level unstable. Bulging is one of disturbance factors and considered for the current stage of study. We design a disturbance observer to attenuate the effect of bulging which is periodic mold level disturbance. Since the period of bulging varies with the casting speed, the parameters of disturbance observer are changed by the casting speed. Simulation is illustrated to demonstrate stable performance of the proposed method in comparison with a previous method in a variable operating frequency.

Dynamic Bulging Behavior Analysis by Finite Difference Method in High Speed Continuous Casting of Thin Slab (유한 차분법에 의한 Thin Slab 고속 연속주조의 동적벌징 거동해석)

  • Jeong, Yeong-Jin;Sin, Geon;Jo, Gi-Hyeon;Gang, Chung-Gil
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.7 s.178
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    • pp.1650-1660
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    • 2000
  • Continuous casting process has been adopted increasingly in recent years to save both energy and labor. It has experienced a rapid development in the production of semi-finished steel products, rep lacing the conventional route of ingot casting and rolling. In order to achieve this merit, however, more studies about the mechanism between roll and slab are needed. In this paper, a dynamic bulging in steel cast slabs was simulated by considering the solidification and heat transfer. This study is to prevent internal cracks of a slab in a bending and unbending zone. The value of moving strand shell bulging between two supporting rollers under the ferrostatic pressure and slab-self weight has been calculated in terms of creep and elasto-plasticity. The strain and strain rate distributions in solidified shell undergoing a series of bulging are calculated with working boundary conditions.

Unidirectionally Solidified Cu Rod Fabrication Using Continuous Casting Apparatus with Cooled Mold (냉각주형식 연속주조장치에 의한 일방향응고 Cu 선재의 제조)

  • Cho, Hoon;Cho, In-Sung
    • Journal of Korea Foundry Society
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    • v.29 no.5
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    • pp.198-203
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    • 2009
  • In order to manufacture copper ultra fine wire used for bonding wire in integrated circuit package, continuous casting process, which can produce high purity copper rod with small cross section, and wiredrawing process have to be optimized to prevent wire brakeage during entire manufacturing process of fine wire. The optimum condition for producing copper rod with mirror surface has to established by investigation of the effects of several parameters such as withdrawal speed, superheat and rod diameter on grain morphology of the cast rod and on its drawing characteristics to fine wire. The purpose of this study is to propose the optimized process parameters in continuous casting process in order to produce cast rod without internal defects, and to predict microstructure orientation suitable for wire drawing process.

An analysis of deformation behavior on dynamic bulging in the high speed continuous casting (고속 연속주조에 있어서 동적 벌징의 변형거동 해석)

  • 강충길;윤광식
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.12 no.6
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    • pp.1217-1226
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    • 1988
  • This paper shows an deformation behavior of steel cast slabs, which is used to prevent internal cracks of a slab in an unbending zone, in case of hot charge rolling(HCR) and hot direct rolling(HDR). The value of moving strand shell bulging between two supporting rollers under ferrostatic pressure has been computed in terms of creep and elastic-plasticity and for high strand surface temperature and high casting speed V=1.4-2.2m/min. The strain and strain rate distributions in solidified shell undergoes a series of bulging are calculated with boundary condition a very closed to continuous steel cast slabs productions.

Large Eddy Simulation of Fluctuating Mold Level - Effects of Nozzle Geometry on Oscillation Frequency (LES를 이용한 몰드 내 탕면 변동 거동 수치해석 - 노즐 형상에 따른 진동 주파수 분석)

  • Lee, Kyongjun;Yang, Kyung-Soo;Cho, Myung Jong;Hwang, Jong-Yeon
    • Korean Journal of Metals and Materials
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    • v.50 no.2
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    • pp.129-135
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    • 2012
  • High speed casting technology is an attractive method to increase the productivity of continuous casting. However, high speed casting causes flow instability of molten steel in a mold. In this study, Large Eddy Simulation (LES) has been performed to identify the characteristics of mold flow for various shapes of submerged entry nozzles. The LES code has been newly developed to efficiently compute the two-phase flow by using the Fractional Step Method (FSM) combined with the Volume of Fluid (VOF) method. The Immersed Boundary Method was used to implement the shape of the submerged entry nozzle. Three cases of discharge angle of the submerged entry nozzle were computed and compared. The current results shed light on improving shape design of a submerged entry nozzle.

Microstructure and Characteristics of SiCp/Al-4.5wt%Cu-1wt%Mg Composites by Pressurized Continuous Compo-Casting (가압연속주조법에 의한 SiCp/Al 합금기 복합재료의 조직 및 특성)

  • Lee, Hak-Joo;Hong, Chun-Pyo
    • Journal of Korea Foundry Society
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    • v.11 no.1
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    • pp.71-78
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    • 1991
  • Microstructure and characteristics of the SiCp/Al-4.5wt%Cu-1wt%Mg composites fabricated by the combination of the compocasting and the pressurized continuous casting process, which is one of the processes to decrease the limitations of the size, and shops of the products, are investigated. The main results are as follows: 1) the SiCp/Al alloy matrix composites can be made continuously 2) as the amount of SiCp addition increases; (1) the degree of directional solidification of matrix structure decreases, and that of SiCp dispersion improves, (2) wear resistance improves, and especially these composites show the excellent wear resistance under the high sliding speed and high final load condition, (3) wear mechanism of these composites is changed from adhesive wear into abrasive wear, and the tendency of that becomes outstanding with increasing sliding speed.

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The Analysis of Deformation Behavior in Thin Slab Caster (박슬라브 연주주편 변형 거동해석)

  • 배원병;박해두;이호국
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1996.03a
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    • pp.165-171
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    • 1996
  • Recently, to improve the productivity in the continuous casting process, thin slab continuous caster which is one of the new steelmaking technologies by a high speed casting has been introduced. In the process of the thin slab continuous cast, there is more possibility than convnetional one that the deformation be occurred by the bulging of solidified shell, since the thickness of soliidfied shell is very thin as much as 60mm after the casting is finished. In some cases of severe bulging, there might be more breakout. In this paper, using finite difference method , solification analysis of slab is made as well as the thicknessof solidified shell and temperature are calculated. Also, based on the data of the calculated temperature, the deformed behavior of solidified narrow face is anlayzed with the MARC which is a package program for finite element analysis.

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