基于有限元法的布流器水口结构优化研究
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摘要
为了研究布流器水口结构与铸轧工艺参数的取值这2个关键因素对薄带产品质量的影响,基于有限元分析软件,建立三维铸轧熔池流热耦合模型。布流器水口结构的部分参数通过正交试验的方法进行了优化,并分析了结构参数对熔池的影响。根据优化后的参数,重新建立模型,研究了铸轧工艺参数对熔池温度场的影响规律。结果表明,布流器侧面水口锥角的取值对熔池出口温度差值影响最大,端面水口倾角主要影响自由液面湍动能差,优化后的熔池模型自由液面湍动能以及熔池出口温度分布更加均匀;熔池出口温度与铸轧速度、过热度呈线性关系,从而得出过热度和铸轧速度的合理取值范围,这为实际生产过程提供理论依据。
In order to study influence of the two key factors of the nozzle structure of the delivery system and casting process parameters on the product quality,a three-dimensional casting and rolling pool flow-heat coupling model was established based on the finite element analysis software.The orthogonal experiments were used to optimize the nozzle structure parameters of the delivery system,and the influence of structural parameters on molten pool was analyzed.The model was re-established with the optimized parameters obtained,and the influence of casting process parameters on the temperature fields of the molten pool was studied.The results show that the taper angle of side nozzles has the greatest influence on the outlet temperature difference.The inclination of the nozzle at end face mainly affects the free surface kinetic energy.The distribution of free surface kinetic energy and outlet temperature of the optimized molten pool is more uniform.The outlet temperature of molten pool is linearly related to casting-rolling speed and superheat degree,the range of superheat degree and casting-rolling speed is obtained in reason,which provides a theoretical basis for the actual production process.
In order to study influence of the two key factors of the nozzle structure of the delivery system and casting process parameters on the product quality,a three-dimensional casting and rolling pool flow-heat coupling model was established based on the finite element analysis software.The orthogonal experiments were used to optimize the nozzle structure parameters of the delivery system,and the influence of structural parameters on molten pool was analyzed.The model was re-established with the optimized parameters obtained,and the influence of casting process parameters on the temperature fields of the molten pool was studied.The results show that the taper angle of side nozzles has the greatest influence on the outlet temperature difference.The inclination of the nozzle at end face mainly affects the free surface kinetic energy.The distribution of free surface kinetic energy and outlet temperature of the optimized molten pool is more uniform.The outlet temperature of molten pool is linearly related to casting-rolling speed and superheat degree,the range of superheat degree and casting-rolling speed is obtained in reason,which provides a theoretical basis for the actual production process.
引文
[1]潘丽萍,贺铸,李宝宽.双辊薄带连铸工艺布流系统的三维数值模拟[J].过程工程学报,2015,15(1):16.(Pan L P,He Z,Li B K.Three-dimensional numerical simulation of the feeding system in twin-roll strip casting process[J].The Chinese Journal of Process Engineering,2015,15(1):16.)
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[11]王三众,黄兆猛,于辉,等.双辊铸轧工艺参数对熔池场变量的影响[J].钢铁研究学报,2017,28(8):643.(Wang S Z,Huang Z M,Yu H,et al.Influence of paramenters on molten pool field during twin-roll casting process[J].Journal of Iron and Steel Research,2017,28(8):643.)
[12] Zhang X M,Jiang Z Y,Liu X H.Simulation of fluid flow,heat transfer and micro-segregation in twin-roll strip casting of stainless steel[J].Journal of Materials Science and Technology,2006,22(3):295.
[13] Li Q,Zhang Y K,Liu L G,et al.Effect of casting parameters on the freezing point position of the 304stainless steel during twin-roll strip casting process by numerical simulation[J].Journal of Materials Science,2012,47(9):3953.
[14]任志安,郝点,谢红杰.几种湍流模型及其在FLUENT中的应用[J].化工装备技术,2009,30(2):38.(Ren Z A,Hao D,Xie H J.Several turbulence models and their applications in FLUENT[J].Chemical Equipment Technology,2009,30(2):38.)
[15]杜凤山,吕征,王三众,等.双辊薄带铸轧熔池流动规律分析与试验[J].钢铁,2016,51(1):60.(Du F S,LüZ,Wang S Z,et al.Analytical and experimental on the flow rule of molten pool for twin roll strip casting[J].Iron and Steel,2016,51(1):60.)
[16]金珠梅,赫翼成,徐广携.双辊连铸铸轧工艺中流场、温度场和热应力场的数值计算[J].金属学报,2000,36(4):391.(Jin Z M,Hao Y C,Xu G X.Numerical calculation of flow fields,temperature fields and thermal stress fields in twin-roll continuous casting process[J].Acta Metallurgica Sinica,2000,36(4):391.)
[17]苗雨川,邸洪双.不锈钢薄带液态铸轧过程的数值模拟[J].塑性工程学报,2000(4):36.(Miao Y C,Di H S.Numerical simulation of liquid casting and rolling process of stainless steel strip[J].Journal of Plasticity Engineering,2000(4):36.)
[18] Lei H,Ceng D Q,He J C.A continuum model of solidification and inclusion collision-growth in the slab continuous casting caster[J].Transactions of the Iron and Steel Institute of Japan,2009,49(10):1575.
[19] Liu L,Liao B,Guo J,et al.3D numerical simulation on thermal flow coupling field of stainless steel during twin-roll casting[J]. JournalofMaterialsEngineeringand Performance,2014,23(1):39.
[20]张晓明,张军锋,刘相华,等.双辊铸轧薄带过程中铸速对熔池内温度场的影响[J].东北大学学报,2006,27(7):759.(Zhang X M,Zhang J F,Liu X H,et al.Effect of casting speed on temperature fields in molten pool during twin-roll casting process[J].Journal of Northeastern University,2006,27(7):759.)
[2] Nikolai Z.Comparison of continuous strip casting with conventional technology[J].ISIJ International,2003,43(8):1115.
[3] Peter C,Wal B,Rama M,et al.The castrip process direct casting of steel sheet at Nucor Crawfordsville[J].Iron and Steel Technology,2005,2(7):56.
[4]朱光明,侯晓东.布流器水口倾角对铸轧熔池温度分布的影响研究[J].铸造技术,2011,32(1):83.(Zhu G M,Hou X D.Effect of nozzle angle of wedge shaped device on temperature distribution in casting molten pool[J].Foundry Technology,2011,32(1):83.)
[5]侯晓东,朱光明.基于有限元法的双辊铸轧熔池内钢液流动规律的研究[J].铸造技术,2010,31(5):644.(Hou X D,Zhu G M.Study on flow pattern of molten steel based on FEM in twin-roll casting[J].Foundry Technology,2010,31(5):644.)
[6] Zhu G M,Zhang C,Xu P G,et al.Experimental study on the distribution of heat flux along contact arc in twin-roll continuous strip casting[J].Key Engineering Materials,2016,693:761.
[7] Kim W S,Kim D S,Kuznetsov A V.Simulation of coupled turbulent flow and heat transfer in the wedge-shaped pool of a twin-roll strip casting process[J].International Journal of Heat and Mass Transfer,2000,43(20):3811.
[8]董建宏,王楠,陈敏,等.双辊薄带铸轧熔池内流场和温度场数值模拟[J].过程工程学报,2014,14(2):211.(Dong J H,Wang N,Chen M,et al.Coupled numerical simulation on the flow and temperature fields of molten steel pool in a twin-roll strip caster[J].The Chinese Journal of Process Engineering,2014,14(2):211.)
[9] Miyake S,Yamane H,Yukumoto M,et al.Strip quality of highly alloyed metals by twin roll casting[J].ISIJ International,1991,31(7):689.
[10] Manish G,Yogeshwar S.Mathematical modeling of fluid flow,heat transfer,and solidification in two-roll melt drag thin strip casting of steel[J].Transactions of the Iron and Steel Institute of Japan,2007,40(2):144.
[11]王三众,黄兆猛,于辉,等.双辊铸轧工艺参数对熔池场变量的影响[J].钢铁研究学报,2017,28(8):643.(Wang S Z,Huang Z M,Yu H,et al.Influence of paramenters on molten pool field during twin-roll casting process[J].Journal of Iron and Steel Research,2017,28(8):643.)
[12] Zhang X M,Jiang Z Y,Liu X H.Simulation of fluid flow,heat transfer and micro-segregation in twin-roll strip casting of stainless steel[J].Journal of Materials Science and Technology,2006,22(3):295.
[13] Li Q,Zhang Y K,Liu L G,et al.Effect of casting parameters on the freezing point position of the 304stainless steel during twin-roll strip casting process by numerical simulation[J].Journal of Materials Science,2012,47(9):3953.
[14]任志安,郝点,谢红杰.几种湍流模型及其在FLUENT中的应用[J].化工装备技术,2009,30(2):38.(Ren Z A,Hao D,Xie H J.Several turbulence models and their applications in FLUENT[J].Chemical Equipment Technology,2009,30(2):38.)
[15]杜凤山,吕征,王三众,等.双辊薄带铸轧熔池流动规律分析与试验[J].钢铁,2016,51(1):60.(Du F S,LüZ,Wang S Z,et al.Analytical and experimental on the flow rule of molten pool for twin roll strip casting[J].Iron and Steel,2016,51(1):60.)
[16]金珠梅,赫翼成,徐广携.双辊连铸铸轧工艺中流场、温度场和热应力场的数值计算[J].金属学报,2000,36(4):391.(Jin Z M,Hao Y C,Xu G X.Numerical calculation of flow fields,temperature fields and thermal stress fields in twin-roll continuous casting process[J].Acta Metallurgica Sinica,2000,36(4):391.)
[17]苗雨川,邸洪双.不锈钢薄带液态铸轧过程的数值模拟[J].塑性工程学报,2000(4):36.(Miao Y C,Di H S.Numerical simulation of liquid casting and rolling process of stainless steel strip[J].Journal of Plasticity Engineering,2000(4):36.)
[18] Lei H,Ceng D Q,He J C.A continuum model of solidification and inclusion collision-growth in the slab continuous casting caster[J].Transactions of the Iron and Steel Institute of Japan,2009,49(10):1575.
[19] Liu L,Liao B,Guo J,et al.3D numerical simulation on thermal flow coupling field of stainless steel during twin-roll casting[J]. JournalofMaterialsEngineeringand Performance,2014,23(1):39.
[20]张晓明,张军锋,刘相华,等.双辊铸轧薄带过程中铸速对熔池内温度场的影响[J].东北大学学报,2006,27(7):759.(Zhang X M,Zhang J F,Liu X H,et al.Effect of casting speed on temperature fields in molten pool during twin-roll casting process[J].Journal of Northeastern University,2006,27(7):759.)