共查询到20条相似文献,搜索用时 346 毫秒
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为了改善热轧不锈钢复合板晶粒组织的均匀性,采用正交试验优化设计方法设计数值模拟方案,研究轧制工艺参数对基层不均匀因子、基层平均晶粒尺寸、复层不均匀因子和复层平均晶粒尺寸的影响,分析各参数的影响显著性顺序,并采用综合平衡法得到优选参数组合,轧制压下率为60%,轧制温度为1 100 ℃,轧制速度为300 mm/s。对优化后的参数组合进行有限元模拟,得到了热轧过程中沿不锈钢复合板厚度方向晶粒尺寸的分布及其变化规律。通过试验与仿真模拟获得的晶粒尺寸进行对比验证,得出晶粒尺寸误差在5%以内,验证了有限元模型的正确性与可靠性。 相似文献
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将Drucker-Prager/Cap塑性模型引入到高硬度W–Cu20粉末轧制有限元分析中,利用巴西圆盘试验、单轴压缩试验以及模压试验得到Drucker-Prager/Cap塑性模型参数,借助商业有限元软件ABAQUS以及Fortran自编的VUSDFLD子程序,建立粉末轧制的有限元模型,并与实际试验进行了比对。结果表明:模拟结果中的板料相对密度和板料厚度与实际实验结果吻合较好,最大误差为4.47%,说明Drucker-Prager/Cap塑性模型对粉末轧制工艺研究有参考意义。 相似文献
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以鞍钢大型厂60 kg/m钢轨轧制过程为研究对象,通过MSC.Marc软件,建立三维弹塑性热-机耦合有限元模型,模拟分析了万能轧机轧制生产过程中轧件的变形和受力情况。模拟结果与实际结果吻合较好,应用所建立的有限元模型对万能轧制机组轧制过程进行模拟,获得了轧制过程轧件变形、受力以及速度等参数的分布情况。 相似文献
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Flange spread is one of the most important factors in the production of H‐beams with the universal rolling mill. Although some prediction models for flange spread have been proposed, the constants in the model equations should be determined for each product size, which requires much experimental work. In this research, finite element analysis was carried out in various rolling conditions and a technique for deciding the model constants by the analysis was investigated. First, rolling experiments using pure lead were carried out to confirm the correctness of the flange spread model. Finite element analyses were then executed for rolling conditions corresponding to the experiments. The flange spread in the numerical analyses showed very good agreement with the experimental results, confirming the accuracy of the numerical simulation. At the same time, the possibility of determining the model constants by numerical analysis was demonstrated. Other related properties of universal rolling were also investigated with the data from the finite element analysis. Changes in the web and flange thicknesses after exiting the roll gap were quantitatively simulated. The cross‐flow behavior between the web and flange was investigated, and the effect of rolling conditions on the cross‐flow ratio was obtained. This research demonstrates that finite element simulation is a powerful tool for investigating and modeling deformation in H‐beam universal rolling. 相似文献
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通过合理的假设对H型钢变形区进行分区.基于流函数方法确定了各个变形区的速度场,建立了H型钢万能轧制力学模型.在此基础上,使用Powell多参数优化算法优化变形区参数以使变形区的总功率达到最小并最终求得H型钢轧制力能参数.计算中采用高斯积分的方法,使得计算结果更加准确.计算结果表明,腹板和翼缘的延伸率相同时,本文模型计算结果与经过实验数据验证的有限元结果的误差不超过1.53%,当偏离标准工况较大时,通过适当修正,亦可保证本文方法的计算精度.在腿腰延伸比λ=1附近时,模型计算的轧制力与有限元结果变化趋势相同.在合理的力臂系数情况下,两者结果吻合较好. 相似文献
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对H型钢轧制过程中腹板波浪的产生机理及形成条件进行了研究。利用解析的方法,给出了腹板产生屈曲的临界应力和应变。使用有限元软件MSC.Marc, 建立了H型钢轧制的弹塑性有限元模型,并成功地仿真出了腹板屈曲现象,给出了此过程中轧件的应力和变形规律。得到了出现腹板波浪时腹板和翼缘相对压下量的临界比值和半波长等特征值参数。 相似文献
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XU Xu-dong BAI Jin-lan WANG Bing-xin LIU Xiang-hua WU Di 《钢铁研究学报(英文版)》2006,13(1):27-30,39
Symbol List a(t)———Node acceleration vector ; B———Flange width, m; ttBL———Transition matrixfromlinear strainto displacement ; ttBNL———Transition matrix from nonlinear strain to dis-placement ; C———Damping matrix; Dh———Diameter of horizontal roll , m; Dijkl———Component of constitutive matrix; Dv———Diameter of vertical roll , m; te.ij———Strain rate tensor ; fi———Unit volume force ,(N·m-3) ; H———Inner width, m; K———Stiffness matrix; M———Mass matri… 相似文献
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Finite Element Simulation of Hot Strip Continuous Rolling Process Coupling Microstructural Evolution 总被引:2,自引:0,他引:2
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. 相似文献