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本文从全浮动芯棒连轧管的工艺特点出发,探讨连轧管前后段尺寸增大的原因。模拟实验说明:轧制中由于芯棒速度的变化,引起了芯棒与轧件接触区摩擦力的变化,机架间推力的变化和机架弹跳值的变化,这三者均引起轧件变形的变化。文中分析了变形变化量在机列上的分布特点,即:在K机架轧制时轧件的截面积增大量最大,在远离K截面的机架上轧件截面积增大量较小(或截面减小)。在稳定轧制阶段,K截面稳定在一定位置,因此轧件的各个截面经历增大或减小的机会和程度相同,轧后钢管中段尺寸均一。而在咬钢和抛钢的不稳定轧制阶段,随着K截面的前移运动,头尾管段有较多的机会处于K截面附近轧制,而有较少的机会处于远离K截面的机架轧制,因此轧后钢管截面尺寸较中段大,形成了前、后“竹节”。本文对“竹节”的形成机理提出了新的看法,从而可以为“竹节”控制提供理论依据。
In this paper, starting from the process characteristics of the full floating mandrel mill, the reason why the size of the front and rear sections of the mill is increasing is discussed. The simulation results show that the variation of the mandrel bar speed in the rolling process causes the variation of the friction force in the contact area between the mandrel and the rolling stock, the change of the thrust between the stands and the change of the bouncing value of the stand, The change. In this paper, the distribution of deformation variation in the train is analyzed. That is, the maximum increase of the cross-sectional area of the rolling stock is obtained when the K frame is rolled, and the increase of the cross-sectional area of the rolling stock is smaller in the rack far from the K section Cross section is reduced). In the steady rolling stage, the K section is stabilized at a certain position, so the chances and degrees of increase or decrease of each section of the rolling stock are the same, and the size of the middle section of the steel pipe after rolling is uniform. However, in the unstable rolling phase of biting and steel-casting, the head-tail pipe segment has more opportunities to roll near the K-section with the forward movement of the K-section, and has fewer opportunities to be located away from the K-section Frame rolling, so the section after the rolling pipe size larger than the middle, forming the front and rear “bamboo.” This paper puts forward a new view on the formation mechanism of “bamboo”, which can provide a theoretical basis for the control of “bamboo”.