冷轧过程中打滑现象对主传动系统扭振影响的研究

发布时间：2018-06-18 13:45

本文选题：扭振 + 自激振动　；参考：《河北工程大学》2015年硕士论文

【摘要】：冶金工业是我国国民经济的的主力产业之一,轧钢机械作为冶金生产的主要设备逐步向高速化,高载荷,连续化和大型化发展。其中冷连轧轧制精度高、带钢薄,对产品的质量的把控也变得尤为的重要。与此同时,轧制过程中轧机所产生的振动问题对产品质量和机械本身造成极大的影响,甚至破坏。轧制时所发生的打滑现象对轧机振动、主传动系统和带钢质量把控都影响巨大。邯钢公司邯宝冷轧厂冷轧生产线由于其轧制力大、轧制速度高、轧制带钢薄等特点使其高速运转过程中的振动现象频繁出现,本文以冷连轧机F4机组振动问题为研究对象,针对其发生的打滑现象从以下几个方面进行研究:(1)根据冷连轧机F4机组主传动系统特性创建七自由度冷连轧机传动系统的扭转振动模型,通过MATLAB软件计算求出F4机组主振型和固有频率以及发生打滑现象时主传动系统各个轴段扭振振幅曲线。建立打滑现象发生时冷连轧机上传动系统自激振动模型,计算得到了自激振动并不稳定的结果。(2)深入分析咬钢打滑现象和轧制打滑现象的发生原因和机理,通过分析找到影响打滑现象的轧制因素,以此为基础提出打滑因子作为打滑现象发生的判断条件,并考虑实际工况进行修正。(3)运用ANSYS/LS-DYNA对轧制过程仿真,通过仿真得到了轧制过程对带钢的影响,并得到了不同摩擦系数、压下比、轧制速度和张力作用下轧制力变化曲线和变形区金属流动相对速度变化曲线。以此为基础提出了针对打滑现象的可控措施。(4)通过冷连轧机F4机组轧制数据对打滑因子进行了验证,并通过此得到了适合该机组的打滑现象安全系数。通过F4机组轧制工艺参数对影响打滑因子的因素进行分析,得到了影响打滑因子的因素变化趋势。通过现场数据得到了一些根据理论判断没有得出的影响因素之间的关系。最后根据冷连轧机整体特性分析得出了实际生产中F4机组抑制打滑现象的可行性措施,并针对乳化液的性能对带钢与轧辊间摩擦系数的影响进行分析,从乳化液皂化值、PH值和铁粉含量对摩擦系数的影响三方面做调整,得到了最佳调整阈值以抑制打滑现象的发生。
[Abstract]:Metallurgical industry is one of the main industries in national economy of our country. As the main equipment of metallurgical production, steel rolling machinery is gradually developing to high speed, high load, continuous and large scale. The rolling precision of cold continuous rolling is high, the strip is thin, and the control of product quality is especially important. At the same time, the vibration caused by rolling mill has a great influence on the product quality and the machinery itself. The slip phenomenon in rolling has a great influence on rolling mill vibration, main transmission system and strip quality control. Because of its large rolling force, high rolling speed and thin strip rolling, the vibration phenomenon of cold rolling production line in Hanbao Cold Rolling Plant of Handan Iron and Steel Co., Ltd., is frequently appeared during its high-speed operation. This paper takes the vibration problem of F4 unit of cold tandem mill as the research object. Based on the characteristics of main transmission system of F4 tandem cold rolling mill, the torsional vibration model of the drive system of seven degrees of freedom cold tandem mill is established according to the following aspects: 1. The main vibration mode and natural frequency of F4 unit and the torsional vibration amplitude curves of each shaft section of the main transmission system are calculated by MATLAB software. The self-excited vibration model of the upper transmission system of tandem cold rolling mill is established, and the results of unstable self-excited vibration are obtained. (2) the causes and mechanism of the phenomenon of steel bite and rolling slip are analyzed in depth. Based on the analysis of the rolling factors that affect the slip phenomenon, the paper puts forward the skid factor as the judging condition of the skid phenomenon, and modifies the rolling process by considering the actual working conditions.) the rolling process is simulated by ANSYS- / LS-DYNA, and the rolling process is simulated by ANSYS / LS-DYNA. The influence of rolling process on strip steel was obtained by simulation, and the curves of rolling force and relative velocity of metal flow in deformation zone were obtained under different friction coefficient, reduction ratio, rolling speed and tension. Based on this, the controllable measures for the slip phenomenon are put forward. (4) the slip factor is verified by the rolling data of the F4 tandem cold rolling mill, and the safety factor of the slip phenomenon suitable for the unit is obtained. Through the analysis of the factors affecting the slip factor through the rolling process parameters of the F4 unit, the variation trend of the factors affecting the slip factor is obtained. Based on the field data, the relationships between some factors which are not determined by theory are obtained. Finally, according to the analysis of the whole characteristics of the cold tandem mill, the feasible measures of restraining the slip phenomenon of the F4 unit in the actual production are obtained, and the influence of the performance of the emulsion on the friction coefficient between the strip steel and the roll is analyzed. The optimum adjustment threshold was obtained from the three aspects of the influence of the saponification value of emulsion and the content of iron powder on the friction coefficient in order to restrain the occurrence of skidding.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG333

【参考文献】