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第30届中国控制与决策会议

作者： Qi Ouyang Mengxue Hu Xinglan Zhang Siming Wei Wenqiang Peng College of Automation Chongqing University Chongqing University of Technology

One of the areas in the high-temperature continuous casting process that has not been definitively addressed is a method for accurately determining of solidified shell ***,this paper investigates a novel method for non-destructive detection of the solidified shell thickness based on the electromagnetic ultrasonic（EMA） *** this method,an electromagnetic ultrasonic transducer（EMAT） was utilized for exciting ultrasonic waves in the continuous casting *** to the fact that the propagation velocity of ultrasonic waves is a considerable difference in the solid and liquid metal,the TOF delay caused by the reflection and refraction at a solid-liquid interface of ultrasonic waves has been ***,studies on the effect of solidification shell thickness on ultrasonic echoes have been carried out by finite element *** the construction of the experimental platform,the measured data show close agreement with the simulation results and thus verify the reasonable and feasible of the proposed method which can provide reference for on-line detection of solidified shell thickness during continuous casting.

关键词： EMA Non-destructive detection solidified shell thickness Continuous casting

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Mathematical model of solidification for round CC billets

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Journal of University of Science and Technology Beijing 2005年第5期12卷 400-405页

作者： Yonglin Li Pei Zhao Guoguang Cheng Shengtao Qiu Jianping Zhang Metallurgical and Ecological Engineering School University of Science and Technology Beijing Beijing 100083 China National Engineering and Research Center for Continuous Casting Technology Central Iron and Steel Research Institute Beijing 100081 China Technology Center Ma＇anshan Iron ＆ Steel Co. Ltd Ma＇anshan 243000 China

A coupled mathematical model was established to simulate the whole solidification process of round billet continuous casting for wheel steel using piecewise linear functions of heat flux density in the mold, the secondary cooling zone and the with- drawing-straightening zone. The calculated results were consistent with the measured data showing that the model accords with the practice. The surface temperature and the solidified shell thickness of round billets are more strongly influenced by casting speed than by casting temperature. The holding zones have effect on surface temperature, which is more obvious for the 450 mm round billet. The relation between casting temperature/speed and solidification end is expressed as a linear function. The solidification end is located after straightening machine.

关键词： round billet surface temperature solidified shell thickness solidification end

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