轧机辊系变形与轧件板形优化

发布时间：2018-05-03 18:39

本文选题：十二辊轧机 + 辊间接触压力分布　；参考：《上海应用技术大学》2015年硕士论文

【摘要】：随着我国对超薄板材及带材的需求量的日益增大,用户对其板形质量要求也日益增高。板形和横向同板差是板带材产品质量的重要指标,板形优化是轧钢先进技术的关键技术之一,为了得到高质量的板带材产品,需要轧机具有高的板形和横向同板差控制精度。而传统的二辊、四辊或六辊轧机生产的薄带材板形和横向同板差难以满足高端产品的需求,而对于生产不锈钢薄带材以及宽而薄的高精度金属板带材都需要采用多辊轧机。为了进一步提高多辊轧机的板形和横向同板差控制精度,对其辊间受力和变形分析、辊型优化设计等研究就显得非常重要。1400mm十二辊轧机主要用于生产横向厚度公差和板形要求非常高的极薄带材和板材,为了更有效提高其控制薄板带材的横向厚度差和板形能力,需要了解其实际轧制过程中,轧辊之间的接触压力分布和轧辊的弹性变形情况,从而可以有效计算轧机实际有载辊缝和轧出轧件的横向厚度差和板形情况。因此准确描述1400mm十二辊轧机轧辊间的接触压力和分布规律对提高其有控制轧出轧件的横向厚度差和板形有着极其重要的指导意义。但由于十二辊轧机轧辊间接触面上的压力分布的不均匀,使其精确的理论求解比较困难,目前还没有有效的理论解。而三维光弹性实验力学分析方法与有限元计算相结合不失为是一种有效的解决途径,这已经在四辊、六辊HC轧机上应用。本文根据应力相似转换准则和实验应力分析关系,建立了相关的十二辊轧机辊间接触应力和接触压力的计算式,并采用三维光弹性的应力冻结和切片分析方法求解出轧辊模型的接触应力分布图,同时依据应力相似转换准则得出实际轧机的辊间接触压力等分布规律。在此基础上,应用MSC.Marc有限元分析软件进一步计算分析出1400mm十二辊轧机在轧制过程中各辊间接触压力分布规律、从而为进一步优化辊型等提供分析依据,对1400mm十二辊轧机轧制产品的板形和横向同板差优化控制等有着重要的指导意义。
[Abstract]:With the increasing demand for ultra-thin sheet and strip in China, the demand for the shape quality of the strip is also increasing. Flatness and transverse difference are important indexes of product quality. Shape optimization is one of the key technologies of advanced rolling technology. In order to obtain high quality plate and strip products, it is necessary for rolling mill to have high control precision of plate shape and transverse plate difference. However, the traditional two-high, four-high or six-high rolling mill can not meet the needs of the high end products, but for the production of stainless steel thin strip and wide and thin high precision metal plate and strip, multi-roll mill is needed. In order to further improve the control accuracy of shape and transverse plate difference of multi-roll rolling mill, the stress and deformation between rollers are analyzed. The research of roll shape optimization design is very important. 1400mm 12-high rolling mill is mainly used to produce ultra-thin strip and sheet with very high transverse thickness tolerance and flatness, in order to improve its ability to control the transverse thickness difference and shape of thin sheet strip more effectively. It is necessary to understand the distribution of contact pressure between rollers and the elastic deformation of rollers during the actual rolling process, so as to effectively calculate the transverse thickness difference and flatness of the actual roll gap and rolling out of the rolling mill. Therefore, the accurate description of the contact pressure and distribution between rollers in 1400mm 12-high mill is of great significance in improving the transverse thickness difference and shape of the controlled rolling piece. However, due to the uneven pressure distribution on the contact surface between the rollers of the 12-high mill, it is difficult to solve the exact theory and there is no effective theoretical solution at present. The combination of three-dimensional photoelastic experimental mechanics analysis method and finite element calculation is an effective solution, which has been applied in four-high and six-high HC mill. Based on the criterion of similarity transformation of stress and the relation of experimental stress analysis, the formulas for calculating the contact stress and contact pressure between rollers of 12-high mill are established in this paper. The contact stress distribution diagram of roll model is solved by means of three dimensional photoelastic stress freezing and slice analysis, and the distribution law of contact pressure between rollers of practical rolling mill is obtained according to the criterion of stress similarity conversion. On this basis, MSC.Marc finite element analysis software is used to further calculate and analyze the distribution of contact pressure between rollers in the rolling process of 1400mm 12-high mill, thus providing an analytical basis for further optimization of roll profile. It has important guiding significance for the flatness and transverse plate difference optimization control of 1400mm 12-high rolling mill.
【学位授予单位】：上海应用技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG334.9

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