摘要
连铸板坯液相分数及凝固末端的准确检测对于减少铸坯偏析、缩松等内部缺陷,提高铸坯质量和生产效率具有重要意义。提出了一种连铸板坯液芯在线检测新方法,通过控制扇形段内弧低幅低频振动,同时提取相应振动频率下结晶器液面波动幅值检测铸坯液芯厚度及凝固末端。根据压下效率与液芯厚度的耦合关系,以及扇形段内弧周期性振动条件下铸坯固液共存区的流变行为,对铸坯液芯厚度与结晶器液位波动的数学关系式进行了理论推导。以某钢厂为例,对不同振幅与不同拉速下的铸坯液芯厚度和凝固末端进行了试验,并与理论值进行了对比,验证了该方法的可行性。研究结果可为连铸板坯凝固过程中液芯厚度及凝固末端的在线检测提供指导和参考。
Accurately measuring the liquid fraction and the solidification end of the slab is of great significance to reduce internal defects such as central segregation and shrinkage porosity of the slab,and it is also great significance to improve the quality of slabs and productivity.In this paper,a new method was proposed to detect the liquid core thickness and the solidification end of the casting,which was achieved by controlling the low amplitude and low frequency vibration of the inner arc in the segment,and at the same time extracting the fluctuation amplitude of the liquid level under the corresponding vibration frequency.According to the coupling relationship between the reduction efficiency and the thickness of the liquid core,as well as the rheological behavior of the slab in the solid-liquid coexistence zone under the periodic vibration of the inner arc of the segment,the mathematical relationship between the liquid core thickness and the liquid level fluctuation in the mold was deduced theoretically.The liquid core thickness and solidification end of the slab with different amplitude and different casting speed were tested in a steel plant,and the feasibility of the method was verified by comparison with the theoretical values.The results provide guidance and reference for the on-line detection of the liquid core thickness and the solidification end of the slab in the solidification process of continuous casting.
作者
何小群
何新军
HE Xiaoqun1,HE Xinjun2(1.Department of Electronics and Information, Chongqing Institute of Engineering, Chongqing 400056, China ;2. Department of Continuous Casting, CISDI R ＆ D Co., Ltd., Chongqing 401122, Chin)
出处
《炼钢》
CAS
北大核心
2018年第2期44-50,共7页
Steelmaking
基金
"十二五"国家科技支撑计划基金资助项目(2012BAE03B00)
关键词
连铸板坯
液芯
在线检测
压下效率
结晶器液位
continuous casting slab
liquid core
online detection
reduction efficiency
mold level
