【摘要】 双辊铸轧过程中,熔池内金属的流动状态及温度分布直接影响着铸轧过程的稳定性及铸带产品的质量.对双辊铸轧不锈钢过程进行了流热耦合三维有限元分析,主要对浸入式水口出口角度及水口浸入深度对熔池内流场和温度场的影响规律进行研究.研究发现,当水口出口角度大于15°时,熔池内出现双漩涡现象,双漩涡的存在不但改变了熔池内金属流动和溶质分布规律,而且对熔池内的温度场产生影响,使熔池表面温度差异减小,有利于提高铸带表面质量.水口浸入深度增加,熔池表面温度降低;浸入深度过浅,熔池表面温度差异增大,对带钢的表面质量不利,模拟研究结果为合理的水口设计提供了理论依据.更多还原

【Abstract】 In a twin-roll strip casting process,the metal flow and temperature distribution in molten pool have a direct influence on the stability of this process and the quality of products.Using a 3D finite element coupling analysis of the temperature and flow fields,a numerical simulation of the twin-roll casting of stainless steel was conducted to investigate mainly the effects of the exit angle and depth of a submerged nozzle in molten pool on the two fields.Simulation result showed that when the exit angle of submerged nozzle is greater than 15°,a double-turbulence is found in the molten pool,which not only changes the metal flow and distribution of solutes,but also affects the temperature field in molten pool.Thus the temperature differences among different positions on the surface of molten pool decrease to improve the surface quality of cast strip.When the submerging depth of nozzle increases the surface temperature at molten pool lowers.While the nozzle is submerged shallowly,the temperature differences among different positions on the surface of molten pool increase to damage the surface quality of strip.The simulation result provides a theoretical reference to the reasonable design of the nozzle during twin-roll strip casting.更多还原