304不锈钢棒线材热连轧过程的数值模拟研究

【作者】 江国栋；

【导师】 张立文；

【作者基本信息】 大连理工大学 ， 材料学， 2004， 硕士

【摘要】 近年来，数值模拟仿真技术以其高效率、低成本的优势在钢铁工业中得到了广泛的应用。国内外许多学者开展了棒线材轧制过程的数值模拟研究工作。受计算机计算速度的影响，应用三维弹塑性有限元方法模拟棒线材连轧的研究中，一般模拟计算的研究对象多为连轧过程的一个环节。由于采用这种方法需要缩短轧辊间距和调整等效换热系数，因此不能获得准确的初始温度场、再现真实的轧制过程。到目前为止，采用三维弹塑性有限元法对棒线材连轧过程真实生产状态的全局模拟尚未见文献报道。 本论文的主要工作是为以大型非线性有限元软件MARC为平台，采用三维弹塑性有限元法研究建立棒线材全流程各个环节真实尺寸的热力耦合连轧数学模型，提出采用连轧过程分段计算、通过数据插值映射传递技术将每个分段环节计算结果传递的新思路，并针对分段环节内的连轧过程，提出采用刚性体传动的新方法，在保证计算精度的前提下，大大简化了计算。通过上述思路和方法，编制开发了一系列程序，解决了在当前计算机软硬件条件下模拟棒线材全流程连轧的技术难题。 结合辽宁特钢集团棒线材连轧生产实际，应用所开发的程序模拟了304不锈钢从出炉到18道次连轧过程各个环节轧件的温度场，并与实测结果进行了比较，计算结果与试验结果基本吻合，验证了计算结果的准确性，为后续课题的开展奠定了基础。 因此，本论文的研究工作具有一定的理论价值和实际意义。更多还原

【Abstract】 Numerical simulation technology, which is efficient and low cost, has been widely used in iron and steel industry. Many researchers at home and abroad have studied on the simulation of continuous rolling process of rod and wire. Limited by the calculation speed of computer, the former investigation mainly focuses on one section of the process during the simulation of the rolling process of rod and wire with 3D elastic-plastic finite element method (FEM). In addition, it cannot gain the accurate initial temperature field and cannot describe the true rolling process because of adopting the method of cutting down the distance of roller and using equivalent heat transfer coefficient. Up to now, few works was reported on adopting 3D elastic-plastic FEM model simulating rolling process with the actual size and distance of rollers.In this thesis, the numerical simulation of the process of continuous rolling has been carried out by means of nonlinear finite element software-MARC. Elastic-plastic FEM is used to study the temperature field of hot continuous rolling and a 3D thermo-mechanical coupled model is built which can really represent the size of every section of the process. During the process of simulation, a new idea is introduced which calculates the temperature of sample for every section and transform the result of calculation to the next section by the technology of interpolation mapping. The study, which adopted the method of controlling the rigid body to push forward the deformable body, can not only get a good accuracy of calculation, but also improve the efficiency. The series models solve the technology problems on the simulation of continuous rolling process under the present conditions.Considering the producing practice of rolling mill of Liaoning special steel Group corporation, the program is applied to simulate the temperature field of 304 stainless steel of every section coming from heat furnace to 18 passes continuous rolling. The calculated results agree well with the measured results. It demonstrates the accuracy of calculation and lays a foundation for the further study. This work is proved to have some academic value and practical merit in some degree.更多还原