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针对全浮动芯棒连轧管机组孔型系统的修改过程,通过生产实验实时记录力能参数,并离线抽取荒管获得钢管壁厚分布曲线,随后进行对比,得到如下结论:连轧钢管壁厚分布具有螺旋形特征,纵向上最大和最小壁厚以波峰与波谷形式交替出现;孔型修改后,钢管壁厚精度降低,力能参数有所升高。分析其原因,孔型修改后,第3、5机架孔型椭圆度增大,加大了钢管压扁变形与金属横向壁厚增厚,并且机组的张力状态未能有效减弱金属横向流动趋势,最终导致壁厚不均率及力能参数升高。
In view of the modification process of full-floating mandrel mill pass system, the force and energy parameters were recorded in real time through the production experiment and the waste tube was taken off-line to obtain the distribution curve of the wall thickness of the steel tube. Subsequently, the following conclusions were obtained: The distribution has the characteristics of a spiral, the vertical and maximum wall thickness of the maximum and minimum wave crests and trough alternate appearance; hole modification, the wall thickness accuracy decreases, the energy parameters have increased. Analysis of the reasons, hole modified, the third and fifth rack hole ovality increased, increasing the steel tube flattening deformation and thickening of the horizontal wall thickness, and the tension of the unit failed to effectively reduce the trend of metal lateral flow , Eventually leading to uneven wall thickness and force parameters increased.