【作者】 刘书强；

【导师】 肖林京； 朱启建；

【作者基本信息】 山东科技大学 ， 机械制造及其自动化， 2005， 硕士

【摘要】 本文在分析了国内外中厚板轧制过程数值模拟发展及现状的基础上,建立了轧前板料冷却过程的有限元模型和中厚板轧制过程的有限元模型,在验证了模型可靠性的基础上,利用模型对轧制过程进行了数值模拟,以探求轧制过程中的规律,解决工业试验不便解决的问题,为工艺优化提供技术支持和理论依据。 课题所进行的主要内容有: 利用所建立的轧前板料冷却过程模型,模拟得到了轧前板料温度场的分布情况,可以方便的获得测温仪器不易观测的板料内部温度分布状况,为轧制过程的准确模拟提供了前提条件。 研究了轧制过程中轧件表面温度上升的机理。利用所建立的轧制模型,模拟了轧制时轧件温度场的变化情况。对由塑性功和摩擦做功引起的轧件温度上升进行了深入研究。 对轧件头部翘曲的机理进行了研究,探寻了多种参数对翘曲的影响,在数值模拟基础上,得到了轧件头部翘曲量的计算公式。 通过采取调节上下轧辊转速比的方式,来消除由轧件内部温度差异造成的轧件头部翘曲,求得到了辊速比的计算公式。 对影响轧制力的因素进行了研究,在程序模拟和数据实测的基础上,得到了求解轧制力的数学公式。更多还原

【Abstract】 Based on the analysis of the development and present situation of the numerical simulation of the medium plate rolling process both home and abroad, a FEM model of the slab cooling process and a FEM model of the rolling process are created. On the premise of being tested the reliability, the models are used for simulating the rolling process, and for searching some regularities of the rolling process, as a result, some problems can’t be solved by industry experiments can be solved in this way conveniently, some technical and theoretical supports for the optimization of technology can be provided.The main contents of the subject as following:Taking use of the model of the slab cooling process, the slab temperature field is simulated, and the inner temperature of the slab is obtained, which is the precondition of the rolling process simulation and not easy to be observed by instruments.The reason of the temperature rise on the rolled piece surface is studied. Taking use of the model of the rolling process, the change of the rolled piece temperature field is simulated, and the rolled piece temperature rise caused by plastic work and frictional work is studied ulteriorly.The mechanics of the rolled piece warp is studied, and some influencing factors of the warp are explored. Based on the simulation, the rolled piece warp calculating formula is gained.The rolled piece warp caused by temperature variance can be erased by the method of adjusting the transmission ratio of the upper and bottom rolls, and a calculating formula of the transmission ratio is obtained.The influencing factors of the draught pressure are studied. Based on the simulated data and the measured data, the calculating formula of the draught pressure is deduced.更多还原