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The vibration characteristic technical indexes of six-high cold strip rolling mills are not given, and thus the chatter vibrations cannot be predicted and prevented. The strip rolling mills can be divided into the non-statically determinate and statically determinate mills according to the statically determinate theory of mechanism. This statically determinate characteristic of the mill does not be distinguished in the traditional mill vibration analysis. In this paper, for these two distinct mill configurations, a complete spatial vibration characteristic analysis involving six degree of horizontal, vertical, axial, torsional, cross and swinging vibration will be presented based on the modified multi-body Riccati transfer matrix method. The results demonstrate that the vibration characteristics of the statically determinate mills are much better that that of nonstatically determinate ones, which significantly indicates the perniciousness of the offset distance and uncontrolled side clearance, and clarifies the necessity of upgrading of the traditional mills. 相似文献
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为了解四辊轧机在轧制过程中液压缸的非线性刚度约束作用,建立了非线性刚度作用下的轧机辊系两自由度垂直振动动力学模型。依据达朗贝尔原理得到含有液压缸非线性刚度的轧机辊系垂直振动方程,运用平均法求得振动系统的幅频响应。以轧机的实际参数为例,分析液压缸非线性刚度、外激励对轧机系统幅频响应的影响,并研究在不同非线性刚度下的轧机振动行为。结果表明,液压缸非线性刚度越大,轧机系统越不稳定;液压缸非线性刚度较弱时,轧机振动行为会逐渐收敛于稳定,液压缸非线性刚度较强时,轧机振动行为会处于不稳定状态,并且出现发散现象,这为抑制轧机振动提供了理论参考。 相似文献
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介绍了国内外热轧板带钢板形控制的有效方法,即液压弯辊,轧辊横移式四辊轧机、PC+ORG轧机以及板形在线检测与控制技术状况;分析了传统四辊轧机的固有缺陷,提出了轧机改造的最佳方案,并针对攀钢的实际情况提出了建议。 相似文献
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某钢厂热连轧生产线F2机架在轧制薄规格产品时发生了强烈的振动现象。为了更好地识别轧机振动的类型,抑制轧机振动,需对轧机系统的固有特性进行全面分析。考虑水平、扭转和垂直系统的振动,并考虑带钢和轧机系统的耦合作用建立热轧机11自由度振动模型,分析轧机系统在无带钢下的固有特性,并分析各阶模态对惯性参数和弹性参数的灵敏度。同时分析带钢和轧机耦合作用下前后张力、入口厚度、出口厚度、摩擦因数、变形抗力等工艺参数对轧机系统固有特性的影响。研究结果表明,带钢和轧机相耦合成一种变结构系统,系统固有特性随着工艺参数的变化而变化,工艺参数主要通过改变第4阶模态和第10阶模态来影响系统固有特性。不同的工艺参数对轧机系统固有特性的影响程度不同,入口厚度影响最为显著,可以通过改变工艺参数来改善系统固有频率。可以为轧机振动类型的识别和振动的抑制提供指导。 相似文献
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根据2300中板轧机的设备特点、轧制产品的工艺状况,开发了一个能适应轧件宽度变化范围较大的2300四辊轧机支撑辊辊型的计算机仿真程序,并研制了一种新的2300四辊轧机支撑辊辊型曲线,以提高该轧机的板形控制能力。研制的新支撑辊辊型曲线经过一年的工业化生产,取得明显的实效,钢板的横向同板差下降幅度达60%~75%;同时钢板的板形明显改善、薄板的边浪现象基本消除;另外轧制压力下降幅度达5%~7.5%,辊间压力分布变化趋缓、轧辊磨损减少、使用周期延长。 相似文献
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建立了摩擦系数非对称性的轧制过程模型,并与某热轧机传动系统的垂直?水平?扭转结构模型相结合,建立了结构?过程相耦合的动力学模型。利用稳定性准则确定了摩擦系数非对称作用下轧机系统的稳定域,分析了摩擦系数的非对称性对轧机系统振动特性和稳定性的影响规律。通过仿真分析表明,摩擦系数的非对称性对系统的稳定性有显著的影响,随着非对称程度的不同,系统会出现稳定域、水平失稳域和水平扭转失稳域,不同程度的非对称性会造成不同的振动形态。通过对某热轧厂现场测试,得到了轧机系统的振动信号,验证了仿真分析的正确性,同时指出轧制集装箱板和普板(Q235)时的变形抗力不同引起稳定域的差异,从而使得在摩擦系数的非对称程度一样时,轧制集装箱板时落在了水平失稳域,系统出现了明显的水平振动;轧制普板(Q235)时落在了稳定域,系统没有明显的振动。 相似文献
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本文以SG18轧机为对象,研究其液压压下作用力与轧制力的函数关系.普通的四辊轧机的轧制力完全由液压压下力作用,但对于SG18轧机除受到支撑辊作用外,还有其它辅助辊作用,压下作用力与轧制力不是简单的传递关系.本文首先对SG18轧机的受力情况进行了定性的分析,然后采用动力学分析软件ADAMS进行仿真研究液压压下作用力与轧制力之间的关系,并根据仿真数据绘制了液压压下作用力与轧制力的关系曲线,并利用回归分析计算理论得出了两者之间的函数,为SG18轧机轧制力的间接测量提供了理论支持. 相似文献
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《钢铁冶炼》2013,40(4):309-313
AbstractIn a number of thin slab caster/hot strip mills, a serious vibration phenomenon can occur in F2–F4 stands during rolling thin gauge or high strength strip. In particular, the vibration of compact strip production (continuous) hot rolling mills is a more serious and difficult technical problem to resolve. When vibration occurs, chatter marks occur on the mill rolls and strip surface together with excessive noise. The problem not only reduces the life of the rolls but also poses a threat to the safety of the production equipment, having triggered a number of major accidents in the past. Following vibration theory study, computer simulation and field tests, measures were implemented to control the vibration, which achieved significant results and economic benefits. 相似文献
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The market demand for high-quality cold-rolled strips has increased along with the rapid development of home appliance manufacturing, aviation and other fields. As the existing research has been largely ignored on the horizontal deflection of work rolls, this paper investigates the characteristics of the equipment and the processes of a slender rolling mill, and then proposes a model for calculating the flattening coefficient between roll gaps at the horizontal deflection of work rolls. A typical product of a 550 mill taken from a steel plant is used as an example, and the factors that affect the flattening coefficient between roll gaps, including the difference between the front and rear tension and the diameter of work rolls, are quantitatively analysed. This paper then proposes a forecasting software that can greatly strengthen the plate-shape controlling ability of rolling mills and improve their product quality, thereby the software deserves to be promoted. 相似文献
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对某热带钢连轧机主传动系统确立了扭振动力学模型,用拉格郎日方程建立了扭振数学模型,用Matlab计算软件求出了系统固有频率和振型,用系数法求出了扭矩放大系数,讨论了频差放大系数对扭矩放大系数的影响关系。该轧机扭矩放大系数偏大,应采取措施加以控制。 相似文献
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四辊可逆式轧机因其转动方式可逆,所以有比普通四辊轧机有着更难控制的辊系稳定性问题。通过研究四辊轧机辊系轴向窜动和水平摆动的各种现象,从辊系的装配和传动两方面入手确定使辊系不稳的影响因素并在生产中加以控制,最终实现了辊系的稳定。 相似文献