【作者】 崔晨光；

【导师】 周庆田； 白振华；

【作者基本信息】 燕山大学 ， 机械设计及理论， 2006， 硕士

【摘要】 现代科技的发展使得用户对冷轧板带材的质量提出了越来越高的要求。实践表明,为了提高冷连轧产品的质量,在生产过程中如何通过对轧制温度进行合理控制以获取良好的表面质量和板形已经成为现场关注的焦点问题之一。本论文在系统地研究了冷连轧轧制过程中引起轧件和轧辊温度变化的主要影响因素的基础上,对冷连轧过程中的温度变化及相应解析方法进行了简单介绍。同时,不但考虑到轧辊的弹性变形,而且考虑到轧件的弹性变形,将变形区分为入口弹性区、塑性变形区和出口弹性区三个部分准确计算了变形区长度和平均轧制力,并以此为基础对引起温度变化的两大主要因素—变形热和摩擦热进行了计算。根据实际参数,分析并做出了入口热轧带钢初始温度、传热系数、最后机架与卷取机之间的空冷传热系数等因素对温度的影响规律图。本文在研究轧制温度模型的过程中,以W.L.Roberts模型为基础,通过将冷连轧特性与变形热和摩擦热的计算相结合并将乳化液传热系数作为变量处理建立了一套新的带材从机架入口到出口的温度预报模型,并取代表钢卷的温度实测值与预报模型的计算值进行对比,验证了该温度预报模型的预报精度。在上述模型的基础上,分别用Fortran语言和Visual Basic编制了温度预报软件和软件界面,该软件操作简单方便且已实际应用到1220五机架冷连轧机上,实现了对温度的有意识控制,取得了良好的使用效果,大大改善了带钢的表面质量和板形精度,得到了现场的充分认可。更多还原

【Abstract】 With the development of modern technology, the quality of the cold rolled strip should be kept improving to satisfy the user’s demands. It is indicated that in order to improve the quality of the cold rolled products, how to get good surface quality and strip shape by controlling the rolling temperature properly during the rolling process has become one of the most important problems in the field.On the basis of the systematical analysis on the main factors that cause the temperature change of the rolled piece and rollers during the process of cold tandem rolling, this paper made a brief introduction of the temperature change in the rolling process and its analytic methods. Meanwhile, it took the elastic deformation of both the rollers and the rolled piece into account. And the length and the average rolling force of every area were precisely calculated by dividing the deformed area into entry elastic area, plastic area and outlet elastic area, on the basis of which the two main factors deformation heat and friction heat that caused the temperature change in the cold tandem rolling process were calculated.According to the practical parameters, the influences of the initial temperature of the hot rolled strip, heat-transfer coefficient, the air cooling heat-transfer coefficient between the last stand and the coiling machine were analyzed and the figures of influencing rules were made.In the process of the temperature analyzing, on the basis of W.L.Roberts model, a new mathematical model of predicting the temperature of the strip from the entry to the outlet were established by combining the features of tandem rolling and the calculation of the deformation heat and the friction heat and taking the emulsion heat-transfer coefficient as a variable. Temperatures of representative coils were measured and compared with the predicted values ofthe temperature calculating model and its forecasting precision was verified.On the basis of the temperature model above, the software of temperature prognostic and the interface of the software were individually established by Fortran and Visual Basic. This software is very simple and convenient to work with and it has been used practically on 1220mm five-stand cold tandem mills. Conscious pre-control of the temperature and good effectiveness which reduced the influence of the temperature on the surface quality and shape of the strip to a great extent were accomplished. It has been well accepted by the field.更多还原