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连轧管机的一个显著特点是毛管(穿孔后的管子)穿在一根芯棒上在轧辊中轧制。通过轧辊和芯棒使毛管产生塑性变形,达到减壁和减径的目的。根据芯棒在轧机中的运动形式分为浮动芯棒和限动芯棒两种轧制方法。所谓浮动芯棒轧制系指在轧制过程中,芯棒随同毛管一起通过连轧管机,芯棒的运动是自由浮动状态。限动芯棒系指在轧制过程中,芯棒以一个远小于毛管速度的恒定速度前进,由于芯棒的运动受到一定的限制,故称为限动芯棒。
A notable feature of a continuous tube mill is that the capillary (perforated tube) is rolled on a mandrel and rolled in a roll. Through the roll and mandrel plastic deformation of the capillary to achieve the purpose of reducing the wall and reducing the diameter. According to the movement of mandrel in the rolling mill is divided into two kinds of floating mandrel and mandrel rod rolling method. The so-called floating mandrel rolling refers to the rolling process, the mandrel along with the capillary through the pipe rolling mill, mandrel movement is free floating state. Limit the mandrel means that in the rolling process, the mandrel to a much smaller than the capillary speed constant speed forward, due to the mandrel movement subject to certain restrictions, it is called the mandrel.