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宝钢新建板带轧机轧制规程及机型选择的研究
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摘要
板带生产在国民经济中起着重要的作用。板凸度和板形是板带产品主要的精度指标,而轧机机型是影响板凸度和板形的一个重要因素。上海宝山钢铁股份有限公司三期后工程将要引进1800五机架冷连轧机和5000宽厚板轧机,由于外商报价提出不同的轧机机型,因此轧机机型选择就是一个需要认真研究和决策的重要课题。
     轧制规程是板带生产的主要工艺技术内容,也是轧机机型选择计算的基础。随着轧制技术的飞速发展,只靠经验方法制定轧制规程已不能满足生产需要,因此,轧制规程优化技术已逐渐被人们所重视。本文首先在考虑轧件弹性变形的轧制压力计算模型的基础上,采用混合摩擦模型,提出了轧制压力在变形区纵向分布的精确解法,对宝钢2030冷连轧机轧制规程存在的问题进行了研究分析,建立了以功率均衡分配和前张力横向分布均匀的板形目标的多目标函数,以轧件咬入条件、最大轧制力、最大轧制力矩、防治打滑等为约束条件的冷带轧机轧制规程优化计算模型,对宝钢2030和新建1800五机架冷连轧机的典型规格产品进行了计算分析。为了5000宽厚板轧机机型选择的需要,根据宽厚板轧制特点,对宽厚板轧制规程的制定进行了研究,并对典型规格产品的轧制规程进行了设计计算分析。
     针对新建1800五机架冷连轧机提出的九种冷轧机机型,应用考虑板形控制能力的冷带轧机机型选择新理论,综合考虑了轧机的板厚分布形状控制能力、对轧制压力而言的横向刚度、对弯辊力而言的横向刚度以及辊间压力分布等指标,对九种冷轧机机型各自的特点和特性进行了综合分析,在此基础上,对宝钢新建1800五机架冷连轧机的机型选择方案作了分析研究,为新建1800项目组提供了技术支持,并取得了很好的效果。为了提高轧机的综合性能,应用轧机设计理论结合现代优化方法,对冷轧机辊系参数进行了优化设计。
     针对宝钢新建5000宽厚板项目组提出的四种宽厚板轧机机型进行了详细的计算和对比分析,并着重对比了两种不同机型及两种不同辊型曲线在宽厚板轧制中的优缺点。针对宽厚板的特点,对PC轧机的轴向力做了详细的计算分析,并利用弹塑性有限元法模拟计算了PC轧机交叉角对板侧边形状的影响,对PC轧机的宽厚板压下规程制定具有一定的指导意义。
Plate and strip production plays an important role in national economy. The crown and shape is the main accuracy standard of plate-strip product, and the rolling mills type is the important element of affecting the crown and shape. The 1800 5-stand cold tandem mill and 5000 wide plate mill will be introduced in later tertiary engineering of Baosteel. As foreign merchant in the quotation tendered variant rolling mills type, the rolling mills type selection is a important subject which needs be researched conscientiously when made decision.
    The pass schedule is the main technological substance in plate and strip production, and is the base of calculation of the rolling mills type selection. It is not satisfaction to needs that the pass schedule was laid down only by empirical method as the very fast development of rolling technology, then the majorized technology of pass schedule is gradual taken seriously by people. At first, based on rolling pressure calculation model that was taken consideration of rolled piece elastic deformation, using mixed friction model, in this paper, accurate solution about rolling force longitudinal distribution at deformation zone, the open question is researched and analysis in the pass schedule of Baosteel 2030 cold tandem mill. The majorized calculation model of rolling regulation on cold strip mill is established with the multiple objective function indued shape object that the power dispensed uniform and the front tension force transverse distributed uniform, with the constraint condition of rolled piece biting
     condition, maximal rolling pressure, maximal rolling torque, and antihunting slipping, then the canonical specification manufactured are analysis and calculated of Baosteel 2030 mill and the 1800 5-stand cold tandem mill. For the requirement of 5000 wide plate rolling mills type selecting, based on the characteristic of wide plate is been researched, and the pass schedule of canonical specification manufactured is design calculated.
    Against the nine types of rolling mills about the 1800 5-stand cold tandem mill, using the new theory of selecting cold strip rolling mill model that the ability of shape control is considered, the indexes are comprehensive considered of the control ability of thickness distribution of strip form, the lateral direction rigidity against rolling pressure, the lateral direction rigidity against bending force and the roll contact pressure distribution, the features and characters of each in the nine's are comprehensive analysis.
    
    
    Then the programmer is analysis of selecting the 1800 5-stand cold tandem mill, which supply of technical support for new item of the 1800, and obtain better effect. For increasing the over-all properties of rolling mills, the optimization design for rolls system parameter of cold rolling mill using rolling mill design theory combination linkage modem optimization methods.
    The detailed calculation and paired analyzing is taken for the four types of wide plate mills which was presented by the new 5000 item groups of the Baosteel, and the merits and faults in wide plate milling are contrasted emphasis on two types of rolling mills model and two kinds of roll shape curve. Against the feature of wide plate, the thrust force of PC mill is detailed calculated and analyzed, and the influence of crossing angle on PC mill to side form of plate is stimulated with elastic-plastic finite element method, It is a certain guide significance to formulate rolling regulation of wide plate on PC mill.
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