连铸板坯液芯在线检测技术
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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.
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.
引文
[1]蔡开科,程士富.连续铸钢原理与工艺[M].北京:冶金工业出版社,1994.
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[6]尹永昌,李建超,王宝峰,等.连铸板坯二冷区辊式电磁搅拌的磁场数值模拟[J].铸造技术,2012(3):69-72.
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[10]SCHUBERT,韦菁,段玉玲.提高产量和质量的新型连铸机传感器[J].钢铁译文集,2005(1):33-35.
[11]WANG Z,WANG X,LIU F,et al.Vibration method to detect liquid-solid fraction and final solidifying end for continuous casting slab[J].Steel Research International,2013,84(8):724-731.
[12]WEYER A,GIRGENSOHN A.Method and device for determining the position of the solidification point:8006743B2[P].2011-08-30.
[13]FORNASIER M.Method for determining a stretch of casting line including the closing position of the liquid cone of a continuously cast metal product:2014006195 A1[P].2016-07-26.
[14]ITO Y,YAMANAKA A,WATANABE T.Internal reduction efficiency of continuously cast strand with liquid core[J].Revue De Métallurgie,2000,97(10):1171-1176.
[15]OGIBAYASHI S,NISHIHARA R,SATOH S.Deformation behavior of continuously cast strand during soft reduction[J].Tetsu-to-Hagané,2009,83:36-41.
[16]林启勇,朱苗勇.连铸板坯轻压下过程中的压下效率分析[J].金属学报,2007,43(12):1301-1304.
[17]WANG B,ZHANG J M,YIN Y B,et al.Study on the reduction efficiency of soft reduction on continuous casting bloom[J].Metallurgical Research&Technology,2016,113(4):406-409.
[18]林启勇,朱苗勇.钢种和断面对连铸板坯轻压下效率的影响[J].钢铁,2010,45(3):32-37.
[19]李德富,林柏年,阎永贵,等.铸钢流变性能的实验研究[J].金属学报,1995,31(21):389-393.
[20]谭利坚,沈厚发,柳百成,等.连铸结晶器液位波动的数值模拟[J].金属学报,2003,39(4):435-438.
[21]董延亮,李杰,张飞,等.结晶器液面波动成因及控制[J].河北冶金,2015(4):38-40.
[2]TAKAHASHI T,OHSASA K I,KATAYAMA N.Simulation for progress of solid-liquid coexisting zone in continuous casting of carbon steels[J].Tetsu-to-Hagane,1990,76(5):728-734.
[3]孙兴洪.连铸坯凝固终点在线检测及控制技术[J].宝钢情报,1992(1):28-34.
[4]SAMOILOVICH Y A.Effect of soft reduction on the structure of continuously-cast slabs[J].Metallurgist,2009,53(1/2):98-104.
[5]HAN Z,CHEN D,FENG K,et al.Development and application of dynamic soft-reduction control model to slab continuous casting process[J].ISIJ International,2010,50(11):1637-1643.
[6]尹永昌,李建超,王宝峰,等.连铸板坯二冷区辊式电磁搅拌的磁场数值模拟[J].铸造技术,2012(3):69-72.
[7]田陆,张卫永.传感器定位装置及具有该装置的连铸坯液芯位置检测系统:201110131679[P].2011-10-05.
[8]冯科.板坯连铸机轻压下扇形段的设计特点[J].炼钢,2006,22(2):53-56.
[9]赵志毅,康永林,刘德民,等.连铸板坯凝固末端在线监测系统[J].北京科技大学学报,2003,25(5):458-461.
[10]SCHUBERT,韦菁,段玉玲.提高产量和质量的新型连铸机传感器[J].钢铁译文集,2005(1):33-35.
[11]WANG Z,WANG X,LIU F,et al.Vibration method to detect liquid-solid fraction and final solidifying end for continuous casting slab[J].Steel Research International,2013,84(8):724-731.
[12]WEYER A,GIRGENSOHN A.Method and device for determining the position of the solidification point:8006743B2[P].2011-08-30.
[13]FORNASIER M.Method for determining a stretch of casting line including the closing position of the liquid cone of a continuously cast metal product:2014006195 A1[P].2016-07-26.
[14]ITO Y,YAMANAKA A,WATANABE T.Internal reduction efficiency of continuously cast strand with liquid core[J].Revue De Métallurgie,2000,97(10):1171-1176.
[15]OGIBAYASHI S,NISHIHARA R,SATOH S.Deformation behavior of continuously cast strand during soft reduction[J].Tetsu-to-Hagané,2009,83:36-41.
[16]林启勇,朱苗勇.连铸板坯轻压下过程中的压下效率分析[J].金属学报,2007,43(12):1301-1304.
[17]WANG B,ZHANG J M,YIN Y B,et al.Study on the reduction efficiency of soft reduction on continuous casting bloom[J].Metallurgical Research&Technology,2016,113(4):406-409.
[18]林启勇,朱苗勇.钢种和断面对连铸板坯轻压下效率的影响[J].钢铁,2010,45(3):32-37.
[19]李德富,林柏年,阎永贵,等.铸钢流变性能的实验研究[J].金属学报,1995,31(21):389-393.
[20]谭利坚,沈厚发,柳百成,等.连铸结晶器液位波动的数值模拟[J].金属学报,2003,39(4):435-438.
[21]董延亮,李杰,张飞,等.结晶器液面波动成因及控制[J].河北冶金,2015(4):38-40.