【作者】 刘红涛；

【导师】 樊丁； 张建斌；

【作者基本信息】 兰州理工大学 ， 材料加工工程， 2011， 硕士

【摘要】 在分析了国内外板材轧制数值模拟发展及现状的基础上,通过有限元法对轧制过程进行了数值模拟,以探求轧制过程中的规律,为合理制定工艺参数,优化工艺结构,提供技术支持和理论依据。本论文研究的主要内容如下:(1)通过304不锈钢高温压缩热变形试验研究950℃、1000℃、1050℃、1150℃和1200℃下的应力应变曲线。利用试验得出的应力应变数据,在DEFORM平台下对其进行压缩热变形试验模拟,并以此来建立各个温度下的数值模型。结果直观的显示了各阶段应力应变分布及试样的变形过程,仿真屈服强度、最大抗拉强度等于试验实测值吻合较好。由此得出的各个温度下的数值模型为304不锈钢的热轧过程模拟提供了必要的力学性能数据,以便热轧模拟能够更精确的进行。(2)对304不锈钢进行热轧数值模拟分析,用云图和点跟踪的方法直观地反映出轧制各个阶段应力应变情况,并通过多组试验对影响轧制压力的参数如轧制温度、轧辊转速、压下量进行了分析,得到了轧制温度、轧辊转速、压下量对轧制压力的影响规律。(3)将模拟轧制压力值与西姆斯热轧轧制力公式计算出的理论值进行比较,两者的变化趋势一致,但有一定的误差存在,对误差存在的原因进行了分析。更多还原

【Abstract】 Based on the analysis of the development and present situation of the numerical simulation of the plate rolling process both home and abroad,the process of rolling is simulated by FEM method,so as to explore the law of the rolling process for the purpose of developing reasonable process parameters , optimizing the structure of the process and providing technical support and theoretical basis.The main contents of the subject as follows:(1) Based on the high temperature compression deformation test of 304 stainless steel,it can be obtained the stress-strain curves under the temperature of 950℃, 1000℃,1050℃, 1150℃and 1200℃. Using the experimental stress-strain data to simulating the process of the compression deformation test and established the numerical models under various temperatures.It showed the distribution of the stress and strain at various stages and the deformation process of the sample intuitively.Meanwhile,the result of the simulation were verified by the experiments.It was the foundation for the establishment of the hot rolling model of the 304 stainless steel under various temperatures,so as to the simulation of the hot rolling process is more accurate.(2) Simulating the 304 stainless steel hot rolling process and using the point tracking methods and cloud pictures to reflect the stress and strain at all stages directly in the whole process.The law of the that how rolling temperature、rolling speed and reduction to influence the rolling force has been obtained by analyzing many parameters which related with the rolling force.(3) The comparison of the simulated rolling results and the calculated results with Sims rolling pressure formula was studied, and the error of them was analyzed.更多还原