双机架紧凑式可逆炉卷轧机板材热连轧的温度场有限元研究

本文实现了对国内唯一一架双机架紧凑式可逆炉卷轧机板材热连轧的温度场有限元研究。采用弹塑性大变形热力耦合有限元法研究板材热连轧过程。利用有限元理论建立了板材热连轧模型,应用MSC／MARC软件进行计算,重点分析了轧制过程和变形区中轧件的温度场分布和变化。计算结果与实际生产情况相吻合,同时表明有限元理论可以实现对板材热连轧过程的数值模拟。     

有限元法在板材热轧中的应用

采用弹塑性大变形热力耦合有限元法研究板材热轧过程．利用有限元理论建立了板材热轧模型;应用MSC／MARC软件进行计算,重点分析了轧制过程和变形区中轧件的温度场分布和变化、金属的流动、应力应变的变化趋势,以及轧制力的变化情况．计算结果与实际生产情况相吻合,同时表明有限元理论可以实现对板材热轧过程的数值模拟．     

铝热连轧温度场模拟在MAC中的实现

通过Gleeble-1500热模拟机等温压缩试验研究了1235铝合金流变本构模型。在此基础上,建立铝板带热轧二维MSC.Marc有限元模型,对热连轧过程温度场进行了模拟仿真,并分析了热连轧过程中的温度场变化规律,为指导生产实践提供理论参考。     

CSP热轧过程温度场模拟

综合考虑传热、变形及变形过程中的再结晶之间的相互影响，对C—Mn钢在CSP热连轧过程的温度场进行了计算机模拟。确定了各种工艺条件下的传热边界条件及其对应的换热系数关系式，计算出了轧件变形过程中温度变化和温度场分布。算例表明，模拟计算具有较好的精度，能为进一步模拟带钢轧后组织演变和性能预测分析提供计算基础。     

热轧三机架连轧轧板过程的二维有限元模拟

应用MARC／AutoForge有限元软件，对轧件在三机架连轧变形过程进行热力耦合模拟。研究了模拟过程中的轧件温度场的分布及变化规律以及轧制力能参数在轧制过程中的变化。分析计算说明，采用有限元模拟的方法可以较好地反映金属的实际变形情况。     

方进椭型钢轧制变形过程三维有限元模拟

应用MARC／autoforge商用有限元软件，对方轧件在椭圆孔型中的轧制变形过程进行热力耦舍模拟。研究了模拟过程中的轧件温度场的分布及变化规律以及轧制能力参数在轧制过程中的变化。分析计算说明，采用有限元模拟的方法可以较好地反映金属的实际变形情况。     

热连轧精轧高速钢轧辊重复上机初始辊形预报

针对热连轧精轧高速钢轧辊重复上机时存在残留磨损辊形和残留热辊形影响初始辊形的问题,分析了残留磨损辊形和残留热辊形对板形控制精度的影响及难点,得出轧辊温度场是高速钢轧辊重复上机初始热辊形最佳表征方式的结论,提出高速钢轧辊下机后空冷过程温度场建模思路,并建立轧辊空冷过程温度场计算模型。在此基础上,基于热连轧生产线二级系统框架,研究形成了高速钢轧辊重复上机初始辊形预报技术设计方案,并在首钢京唐公司1 580 mm热连轧生产线应用。应用结果表明,该技术对实现热连轧精轧高速钢轧辊更高效应用和提高板形控制精度有显著效果。     

芯棒钢轧后端部应力应变和温度变化三维有限元分析

采用MSC.Marc三维热力耦合弹塑性大变形有限元软件及其接触分析技术。在分析现场工艺设备参数建立相关边界条件的基础上。对ф153mm合金钢4道次热连轧过程中轧件变形进行了三维模拟仿真。计算了轧件的应力，应变，温度分布和轧制力，轧制力矩的分布。     

板材轧制过程轧制力刚塑性有限元快速计算

 为了满足板材轧制过程在线控制快速计算的要求,首先建立了板材轧制平面应变刚塑性有限元能量泛函。其次,通过合理的简化建立了只考虑变形区的快速有限元模型,且对有限元建模的关键问题包括中性点、第一类速度奇异点和刚性区等进行了处理。最后,开发了板材轧制快速计算有限元程序,并且利用现场轧制数据测试了快速有限元程序的计算速度和精度,结果表明计算速度和精度满足在线快速计算的要求。     

椭-圆孔型连轧大圆钢三维热力耦合弹塑性有限元分析

采用MSC．Marc三维大变形热力耦合弹塑性有限元软件和接触分析技术，对Φ230mm大圆钢两机架热连轧过程中轧件三维变形进行了有限元仿真，计算了轧件主要力能参数的分布值和极值，以此对轧辊强度、孔型尺寸及相关的轧制工艺参数进行分析，得出采用道次小变形量和快速轧制工艺，有助于减缓热作模具钢轧后端部表面残余应力升高和温度降低，避免表面裂纹的产生。     

Finite Element Simulation of Hot Strip Continuous Rolling Process Coupling Microstructural Evolution

 Using the nonlinear rigid viscoplastic finite element method (FEM), a finite element simulation of the hot strip continuous rolling process was done, which completely integrates different phenomena such as the metallurgical behavior of the strip and the thermo mechanics in the strip based on the physical metallurgical microstructural evolution law. By combining with the process parameters of certain 2 050 mm hot strip rolling, an actual rolling process of low carbon steel SS400 was simulated using the FEM model. Based on the simulation results, the distributions of the strain field, the temperature field, and the microstructure were presented. Meanwhile, the simulated rolling force, temperature, and microstructure are in good agreement with the measured results.     

304不锈钢棒线材热连轧温度场的数值模拟

采用三维大变形热力耦合弹塑性有限元法,借助商业有限元软件MSC.Marc,建立了辽宁特钢 304不锈钢棒线材18道次连轧过程的三维数学模型。采用3组连续模型模拟了该过程,道次出口处采用刚性 面控制轧件前进,各模型之间的数据通过插值方式传递,得出304不锈钢轧件同一截面上心部、中部和表面点 从出炉到18道次轧制过程的温降曲线。计算结果与实测值吻合,误差为5~50℃.     

3D FE Analysis of Thermal Behavior of Billet in Rod and Wire Hot Continuous Rolling Process

 An FE model was developed to study thermal behavior during the rod and wire hot continuous rolling process. The FE code MSCMarc was used in the simulation using implicit static arithmetic. The whole rolling process of 30 passes was separated and simulated with several continuous 3D elastic plastic FE models. A rigid pushing body and a data transfer technique were introduced into this model. The on line experiments were conducted on 304 stainless steel and GCr15 steel hot continuous rolling process to prove the results of simulation by implicit static FEM. The results show that the temperature results of finite element simulations are in good agreement with experiments, which indicate that the FE model developed in this study is effective and efficient.     

铝合金超厚板热轧过程温度场模拟

根据热模拟试验所获得的实验数据,在MARC软件中建立试验铝合金的材料数据库。采用二维弹塑性大变形有限元法,对铝合金超厚板热轧过程进行了数值模拟,分析了热轧过程中轧件温度场的分布和变化规律。模拟结果表明,在整个轧制过程中,轧件内部节点的温度变化缓慢,而表面节点的温度变化较为剧烈。计算的板坯表面温度与实测的表面温度吻合较好,表明该模型可以用来模拟中厚板轧制过程中的温度变化。     

带钢热轧过程中轧件横断面上温度场的解析

通过对带钢热这轧过程中传热关系的分析，利用有限元法建立轧件横断面温度场的计算模型。利用该模型对本钢热轧厂的现场生产条件进行了计算，依据计算结果总结出热轧过程中轧件断面温度场的变化规律。     

Application of FEM to Hot Continuous Rolling Process for Inconel 718 Alloy Round Rod

 A finite element model is made for coupled thermo-mechanical analysis during hot continuous rolling process for finished product- Inconel 718 alloy round rod with diameter of 45mm. The stability of that process is discussed by integration of FEM and processing map reported in open literature. The result shows that the stability of Inconel 718 will be analyzed effectively during that process and good stability appears as the initial temperature is 960℃ and the initial velocity is from 0.15 to 0.45m•s-1 or the initial temperature is 980℃ and the initial velocity is from 0.15 to 0.25m•s-1.     

棒线材轧制的上限法解

应用上限法建立了棒线材轧制的三维运动许可速度场，并通过对变形功率求最小值确定最佳的变形过程，该解析方法可用于求解平辊和凸凹型辊的二辊、三辊及多辊轧制过程的轧制力，轧制力矩和宽屏率等参数。其结果与刚一塑性有限元法计算结果进行了比较，其中力能参数与有限元法计算结果吻合较好，而且求解过程较刚一塑性有限元法更简便、灵活。     

Analysis on Shear Deformation for High Manganese Austenite Steel during Hot Asymmetrical Rolling Process Using Finite Element Method

Based on the rigid-plastic finite element method(FEM), the shear stress field of deformation region for high manganese austenite steel during hot asymmetrical rolling process was analyzed. The influences of rolling parameters, such as the velocity ratio of upper to lower rolls, the initial temperature of workpiece and the reduction rate, on the shear deformation of three nodes in the upper, center and lower layers were discussed. As the rolling parameters change, distinct shear deformation appears in the upper and lower layers, but the shear deformation in the center layer appears only when the velocity ratio is more than 1.00, and the absolute value of the shear stress in this layer is changed with rolling parameters. A mathematical model which reflected the change of the maximal absolute shear stress for the center layer was established, by which the maximal absolute shear stress for the center layer can be easily calculated and the appropriate rolling technology can be designed.