热轧带钢层冷起套问题的原因分析与改进措施

Cause analysis and improvement measures of hot rolled strip arching in laminar cooling

为了解决热轧带钢头部在层冷辊道上起套,即拱起堆积的问题,基于某1 580 mm半连续式热轧带钢生产线,根据头部起套带钢表现形态并结合受力分析,明确了带钢起套的影响因素及形成原因,并提出了针对性控制措施。结果表明:带钢起套是由于带钢向前运行时层冷水的阻力过大且带钢与层冷辊道间静摩擦力动力过小而导致,成品带钢厚度越薄、宽度越窄、卷取温度越低、存在中间浪形、层流水流量越大,越容易发生起套现象。为此,提出了控制层冷水流量、增加层冷水对层冷辊道的冷却功能、调整层冷辊道标高、薄规格带钢头部进行不冷却处理、控制带钢板形等改进措施,应用于生产后,带钢在层冷辊道上起套的问题得到了有效控制。

In order to solve the problem of the hot rolled strip head arching on the laminar cooling roller table,that is,the head of hot rolled strip is arched and stacked,based on a 1580 mm semi continuous hot rolled strip production line,according to manifestation of the strip with head arching and combined with stress analysis,the influence factors and causes of strip arching are clarified,and the targeted control measures are put forward.The results show that the strip arching is due to that the resistance of the laminar cooling water during strip running forward is too strong and the static friction force between the strip and the laminar cooling roller table is too small.The thinner the thickness and narrower the width of the finished strip,the lower the coiling temperature,the presence of intermediate waves,and the greater the flow amount of laminar water,the easier it is for the strip head arching phenomenon to occur.Therefore,the improvement measures of controlling the flow amount of laminar cooling water,adding the cooling function of laminar cooling water to the laminar cooling roller table,adjusting the elevation of the laminar cooling roller table,performing no cooling on the thin gauge strip head and controlling the strip shape are put forward.After the measures are applied in production,the problem of hot rolled strip head arching in laminar cooling has been effectively controlled.