整体型螺旋高翅片管孔型斜轧运动学分析

Kinematic analysis of rotary rolling process of integral helical high fin tube

介绍了螺旋翅片管孔型斜轧工艺的主要特点,通过建立运动学分析的几何模型,研究了轧辊与轧件的运动关系,主要包括两者圆周速度的关系以及接触区域的相对滑动情况。研究了变形区轴向和切向速度分布规律。结果表明,沿轧制方向轧件轴向分速度和周向分速度都增大,周向速度增加的趋势远大于轴向速度,从而使轧件在轧制过程中发生扭转和轴向延伸。引入扭转率的概念描述轧制方向上轧件圆周速度的变化程度,给出了表达式,通过公式简单分析了主要参数如轧辊转速、相对压下量、轧辊轧件中心距以及轧片半径等对扭转率的影响。

The main characters of the helical fin tube rotary rolling process were introduced and geometric model was built to analyze the kinematic relationship between the roller and tube,such as angular velocity and relative velocity in sliding area.Velocity distribution was investigated in the form of component velocity in the deformation zone.The results show that both circumferential velocity and axial velocity increase along the rolling direction and the rising rate of circumferential velocity is much higher than that of axial velocity.Thereby the circumferential twist and the axial elongation occur on helical fin tube rolling workpiece in roll process.Twisting rate was introduced here to describe the variation of angular velocity along the rolled tube.Using the given expression,the influence to twisting rate by the main factors,such as roll speed,relative reduction,center distance and roller radius can be obtained.