Online Flow Control with Mold Flow Measurements and Simultaneous EM Braking and Stirring

9th International Symposium on Electromagnetic Processing of Materials

材料科学;物理学

Sedén, M.^1 ; Jacobson, N.^1

ABB AB, Industrial Automation, Process Industries, Metallurgy, Vasteras, Sweden^1

关键词: Automotive body panels;    cleanliness;    Electromagnetic actuators;    Electromagnetic braking;    Electromagnetic stirring;    Initial solidification;    Real-time information;    slab;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/424/1/012015/pdf
DOI  :  10.1088/1757-899X/424/1/012015

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

To obtain flow control of the molten metal in the mold where the initial solidification steps of continuous casting occur, a versatile electromagnetic actuator is required to enable both flow acceleration and stabilization to counteract different undesired flow phenomena. Various mold monitoring systems instantly give insights into the dynamics of the meniscus level, solidification status and molten steel flow characteristics during casting. An online mold flow sensor in combination with an electromagnetic actuator capable of applying time varying braking and stirring forces simultaneously, enable closed loop mold flow control with automatic handling of regular as well as sudden variations in the casting conditions in real time. A control package for the FC Mold G3, a combined two-level electromagnetic actuator with a brake in the bottom of the mold and a combined stirrer and brake in the top of the mold, reacting on varying macroscopic casting conditions has been used in steel plant production to minimize quality and operational issues. The control relies on predictions of the amount of surface defects based on experience and numerical simulations of the fluid flow. Plant quality results, collected during a year of full production, show a surface defect reduction of more than 50% with FC Mold G3 on critical ULC grades for exposed automotive body panels [1]. In the next step, real time information taken directly from process monitoring will dynamically control the FC Mold with further improved slab cleanliness and surface quality as a result.