【作者】 季明；

【导师】 陈占福；

【作者基本信息】 上海交通大学 ， 机械设计及理论， 2011， 硕士

【摘要】 宝钢2050热轧于1989年建成投产,经历二十多年的新产品开发,以适应激烈的市场竞争,其在品种与规格上均比设计时有较大的突破。新型高硬度组轧材的变形抗力目前难以在原设计的侧压量下顺利轧制,增加板坯侧压能力成为2050热轧亟待解决的难题。本文详细论述了增加板坯侧压能力的整个流程,它包括必要性论证、改造方案的选择、改造后板坯厚度增大对于后续水平轧机的影响,并以此为工程背景,通过建立侧压过程有限元模型,系统研究了不同定宽机模块对于轧制力及板形变化的影响,为改造过程中定宽机的选型提供了依据,同时对于改善轧制过程稳定性及轧后板形质量具有重要作用。本文研究工作取得了如下主要结果:1、2050热轧线对于板坯的调宽主要由E1立辊轧机完成,E1轧机在实际生产中出现的侧压能力不足说明了改造的必要性。在增加侧压能力的三种可供选择中,确定了增建SSP定宽机为最佳方案。另外还对比分析了三家SSP制造商产品的各自特点。2、在分析侧压轧制原理、SSP结构及模块运动模型的基础上,利用Marc软件建立了SSP侧压有限元模型,得出了模块工作面数量、模块截面形状对于轧制力峰值的影响规律。此外,在板坯变形方面,得出了板坯头部失宽量、切头切尾量、“狗骨”高度与侧压量间的回归曲线函数关系式,比较了三种SSP模块侧压后对轧制力及板形影响的优劣。3、对立辊轧机实际生产中,辊槽因磨损和重车变宽对轧后板坯横截面形状产生的影响做了分析,得出了对于板坯“狗骨”形状的影响规律。此外研究了立辊辊槽不对中对轧制后板坯形状的影响,解释了造成板形恶化的原因。4、研究了进一步提高立辊轧制力时,E1轧机的工作状态。通过建立E1轧机重要部件机架、丝杆螺母的有限元模型,计算了在轧制极限负荷8MN的条件下,轧机力学薄弱点的位置,提出了改进方案,结果为提升现有设备轧制能力提供了理论依据。5、研究了增建SSP后,对后续R1水平轧机的影响。以经SSP最大侧压量350mm轧制后的板坯为研究对象,计算了R1轧机此时在满足咬入条件下的最大压下量以及稳定轧制条件,提出了改善咬入和稳定轧制的措施。另外,通过建立SSP侧压和水平轧制综合有限元模型确定轧制力,校核了R1主电机功率,结果表明其在改造后,仍满足带钢压下的需求。更多还原

【Abstract】 Founded and put into operation in 1989. Baosteel 2050 has a twenty-year’s history of new product development to face the market competition. It has a major breakthrough in the varieties and specifications than the original design. However, it now turns hard for original lateral pressure to roll high deformation-resistance slab efficiently. Thus, increasing slab lateral pressure becomes a key issue that 2050 hot rolling needs to solve.This paper discusses the entire process of increasing slab lateral pressure. It includes preliminary necessity studies, reform plan’s determination and influence on the following horizontal mill after reform. Take this as project background, it studys the influence of different die shapes on rolling force and slab shape by establishing the FEM model of SSP process. The result provides reference in SSP selection during the application of transformation process. In addition, it also has important theoretical reference value in improving the stability of pressing process and the quality of rolled slab shape. This research has main results as following:1. Slab width reduction is mainly completed by E1 edger mill. Reform necessity has been proven by frequent lateral pressure insufficiency of E1 during practical production. Adding SSP has been chosen as the best option comparing to others. Besides, products’ characteristics from there different SSP manufactures have been compared.2. Based on the analysis of rolling theory, SSP structure and motion model. the FEM model of SSP process has been built by software Marc, which simulates and studys the influence of die’s working face quantity and section shape on the peak of rolling force. And refering to slab shape deformation, it regresses the function between slab head width reduction, head and tail cut, dog-bone height and edging draughts respectively. Thus, the merits of three SSP die on rolling force and slab shape has been compared.3. Influence of abraded and lathed vertical roll groove on the dog-bone shape of rolled slab has been studied during actual production of edger mill. Besides, influence of the unalignment of vertical roll groove and slab on rolled slab shape has also been analyzed, which demonstrates the reason of corresponding slab deterioration.4. E1 mill’s working condition has been studied when further increasing lateral pressure of edger mill. Through establishing FEM model of E1 edger mill’s key components such as mill stand and screw/nut pairs, the location of probable mechanical failure under ultimate rolling load 8MN has been forecasted, and corresponding improving solution has been proposed. The result provides a theoretical reference in increasing slab lateral pressure of present equipment.5. The following R1 horizontal mill’s working condition after adding SSP has been studied. Taking the slab rolled by SSP under maximum amount of lateral pressure 350mm as research object, this chapter calculates R1 mill’s both maximum pressing volume under the requirements of biting condition and subsequent stable rolling condition. In addition, by establishing the comprehensive FEM model of both SSP pressing and horizontal rolling, it calculates the rolling force and then checks R1 mill’s main electric motor power, result shows that it still meets the rolling requirements after adding SSP.更多还原