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1.
对双辊板带铸轧的凝固过程中金属的形核和生长行为进行了数值模拟,建立了一套描述双辊板带凝固组织参数的表征体系,从而为双辊铸轧板带凝固组织特征的定量数学描述奠定了理论基础.同时为该领域的试验研究提供了理论基础.  相似文献   

2.
借助大型有限元分析软件ansys中的flotran CFD模块,对双辊板带铸轧的凝固过程进行了模拟分析,并对不同导热系数的侧封板对双辊板带铸轧凝固过程的影响进行了对比分析。此模拟结果可以为控制铸轧过程提供有效的参考。  相似文献   

3.
任志峰  孙斌煜  孟繁霞 《山西冶金》2007,30(2):18-20,26
借助商业软件procast研究了不锈钢双辊铸轧过程中各相关主要工艺因素对辊-板系统温度场的影响,建立了辊-板系统传热规律的基本方程,揭示了不锈钢双辊铸轧过程中辊-板系统温度场的变化规律和传热的基本规律,为制定不锈钢双辊铸轧工艺打下了基础。  相似文献   

4.
双辊薄带钢铸轧过程的流场温度场耦合数值模拟   总被引:3,自引:0,他引:3  
采用有限元法模拟了双辊铸轧不锈钢过程的流热耦合问题;分析了铸轧速度对熔池内流场,、温度场的影响以及流民温度场与温度场之间的相互影响,给出了凝固过程中熔池与铸轧辊之间的热流密度变化趋势及随铸连的变化规律,并把此模拟的结果与试验的结果相比较,吻合较好;通过熔池内温度场及温度梯度分析了熔池内凝固的发展及其对热流密度变化的影响。此  相似文献   

5.
首次采用ANSYS有限元软件,在Anand模型基础上对304不锈钢双辊铸轧熔池应力场进行模拟,并对不同工艺参数下的应力分布情况进行了研究及工艺优化。结果表明,铸轧熔池中应力较高的部分主要集中在熔池出口处及熔池与轧辊的接触部分,且随着铸轧速度和浇铸温度的提高,出口处整体应力均呈现减小的趋势。优化后的铸轧速度应控制在0.7 m/s以上,浇铸温度应控制在1 520℃以上。  相似文献   

6.
工艺因素对铝双辊铸轧凝固过程的影响   总被引:1,自引:0,他引:1  
利用铝双辊铸轧过程传热数学模型,系统分析了辊套材料、浇注温度等工艺因素对铝双辊铸轧过程凝固速率的影响及进一步提高铸轧机生产能力的途径,建立了钢和铜合金2种辊套材料的凝固壳厚度随时间变化的计算公式。  相似文献   

7.
半固态镁合金板带双辊铸轧工艺参数研究   总被引:3,自引:0,他引:3  
采用AZ91D镁合金为原料,以自行设计的双辊板带铸轧设备进行试验,研究半固态镁合金铸轧的工艺参数剪切速度、静置时间、浇铸温度对半固态组织的变化规律并对其形成机制作出分析。试验表明:剪切速度越大,浇铸温度越低,静置时间适中时半固态镁合金浆料制备的镁板带组织的固相颗粒越细小、均匀、圆整。但是由于试验各方面条件的限制剪切速度不可能太大、浇铸温度太低金属液不易流动,因此通过试验得到了最佳的工艺参数为:剪切速率为900 r.min-1、静置时间为15 min、浇铸温度565℃左右为宜。  相似文献   

8.
结晶辊内部结构非常复杂,受热发生变形后,辊表面形状变得不规则,因此研究结晶辊温度场、热应力及热变形,掌握其分布规律,对于控制结晶辊的变形,得到均匀的铸带具有重要意义.以结晶辊为主要研究对象,采用热结构直接耦合方法计算结晶辊的温度场、热应力和热变形,为结晶辊的设计提供参考.结果表明,选用Be-Co-Cu作为结晶辊材质,辊转动30 s后,辊外表面温度和最大等效应力保持稳定,最高和最低温度分别为198和449℃,最大等效应力为1041 MPa;转动300 s后,辊内部温度及变形达到稳定状态,辊外表面径向位移都在0.4~0.5mm之间.通过对比Be-Co-Cu材质和钢材质的温度和最大等效应力,得出Be-Co-Cu材质更适合于制造双辊的结论.  相似文献   

9.
建立了双辊薄带连铸冷却数学模型,并利用有限元软件对薄带连铸凝固过程进行了数值模拟。同时,通过对不同的网格划分方法对计算结果的影响进行了比较和分析,为进一步对薄带连铸凝固过程的深入分析奠定了基础。  相似文献   

10.
 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与铸带产品的质量。针对实验室双辊铸轧试验的特点,采用三维有限元法模拟了双辊铸轧过程的热流耦合问题,利用热平衡计算、铸轧实验和模拟相结合的反向方法分段建立了凝固过程中凝壳与铸辊之间热传导系数与铸轧速度、熔池位置之间的关系模型,并分析不同工艺条件下熔池内凝固变化的情况。  相似文献   

11.
徐海波  杜艳平  孙斌煜 《山西冶金》2011,34(1):10-12,15
以低碳钢为例对双辊连铸过程进行了微观模拟。研究了浇注温度、拉坯速度、冷却强度等工艺参数对带材结晶凝固晶粒度的影响,得出了不同工艺条件对铸轧带材晶粒度的影响规律以及最佳的模拟参数。通过实验结果与数值模拟结果的对比,验证了模拟结果的正确性,说明模拟结果对实际有一定的指导意义。  相似文献   

12.
Inthetwinrollstripcastingprocess ,themechanicalbehaviorofcastingmaterialcangreatlyinfluencerollingforce,whilerollingforceisrelevanttostripsurfacequali ty .Ifrollingforcesurpassesalimitedvalue ,theheattransferfromstriptocastingrollwillbecomeunevenalongstr…  相似文献   

13.
The fluid flow in a twin‐roll strip caster is investigated by physical and numerical simulation on a 1:1‐scale water model. A laser‐optical measurement technique (Laser Doppler Anemometry ‐ LDA) is used to validate the numerical results for the water flow. The numerical simulations are then transferred to the melt flow in the strip caster. The investigations are focused on different SEN concepts (submerged entry nozzle), a single‐nozzle system with two outlet ports and a double‐nozzle system with one outlet port each. The Influence of these concepts on the velocity, turbulence, and temperature distribution inside the liquid pool between the casting rolls and on the solidification and growth of the strip shells are investigated by numerical simulations (Computational Fluid Dynamics ‐ CFD). The non‐isothermal melt flow is calculated considering the solidification enthalpy as well as the behaviour of the solidifying melt. In addition to the numerical simulations of the melt flow inside the pool the temperature distribution in the cast strip is simulated. The SEN concept directly correlates with the temperature distribution Inside the strip. Furthermore, the surface temperature of the strip below the outlet of the roll gap is measured using a line‐scanner and is compared with the CFD simulation. In order to simulate the shape of the free surface in the liquid pool, CFD simulations of the water flow in the physical model are carried out using a Volume of Fluid model (VoF). This two‐phase model is able to reproduce free surface waves.  相似文献   

14.
A three‐dimensional mathematical model has been developed to simulate turbulent fluid flow, heat transfer and solidification in the pool of a twin‐roll strip caster. A Darcy‐porosity approach was used to study the fluid flow within the mushy solidification zone in the pool. The effect of the heat transfer coefficient and permeability constant on the flow and solidification was also predicted. It was shown that an even flow and temperature distribution of the pool can be obtained by using a suitable feeding system. The heat transfer between the rolls and the solidifying metal has a big influence on the location of the solidification end point. The permeability of the mushy zone is a key factor which affects the flow and solidification in the twin‐roll strip casting process.  相似文献   

15.
双辊铸轧薄带钢温度场的有限元分析   总被引:2,自引:0,他引:2  
针对实验室现有的实验设备条件,建立了双辊铸轧薄带钢过程的有限元数学模型,通过程序开发对熔池内的温度场进行了模拟;给出了各工艺参数对凝固终点位置及铸带表面温度的影响规律,为铸轧过程的分析和控制提供了理论依据.  相似文献   

16.
Thetwinrollstripcastingprocess ,whichcancastmoltensteelinto 1- 5mmstripdirectly ,isat tractingtheattentionofthesteelproducersallovertheworld .Ithasmanyadvantagesoverconventionalstripproducingtechnology ,suchasreducedenergyconsumption ,lowerinvestmentandhigherflexibili ty .Comparedwiththinslabcasting process ,thistechnologycansave 70 %ofproductionandinvest mentcosts[1] ,and producestripswith poorform ability ,suchastoolsteelandsiliconsteelstrips .  Thoughtwinrollstripcastinghasbeendevelop ing…  相似文献   

17.
铸轧辊热辊型的研究   总被引:1,自引:0,他引:1  
建立了双辊薄带铸轧过程中的铸轧辊传热及热变形三维有限元模型.通过动态模拟计算,得到了铸轧辊在稳定工作条件下的铸轧辊辊套的热辊型分布,发现铸轧辊在转动过程中,辊套内、外表面径向热变形分布呈近似椭圆形,即在一个转动周期中,有两个热变形峰值,而且铸轧辊中间对称部位的径向热变形椭圆长轴与边部径向热变形椭圆长轴不在同一个方向上.  相似文献   

18.
Thin strip casting of steel through a twin‐roll caster demands the production of a perfectly homogeneous strip. This requirement is often not fulfilled due to non‐uniform heat contact between the solidifying strip and the rolls in the pool, which leads to temperature inhomogeneities visible at the strip behind the rolls (spottiness). The effect of spottiness is described from experimental observations in terms of contrast between dark and hot spots and of the mean diameter of the hot spots. The contrast is found to depend on roll material, surface roughness and roll velocity. A general dependence on the temperature difference between melt and rolls is observed. Calculations of heat transfer in the liquid and solid pool explain the hot‐dark‐temperature differences. The spottiness visible on the strip after leaving the rolls is initiated in the liquid pool, but it is enlarged by rolling contact differences in the solid pool. A model consideration based on thermally caused bending of the solidified material layers leads to a good coincidence with experimental data of the heat transfer coefficient at hot spots.  相似文献   

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