斜轧扩管机的送进角分析

以斜轧扩管机的轧辊调整方式为基础，推导了斜轧扩管工艺的几何学和运动学基本关系式，分析了其送进角的形成特点和变化规律。结果表明：尽管斜轧扩管机在轧辊调整时不能体现送进角的形成，但辗轧角的存在和轧辊的垂直移动共同导致了送进角的形成，这就使斜轧扩管机具有了典型的二辊斜轧特征。辗轧角越大，送进角越大：轧辊平移距离越大，送进角越大；基圆圆心离轧制中心线距离越小，送进角越大。从变形区人口到出口．辊面上各孔径点的送进角约南7．5°变化到3．0°。

Analysis on Feed Angle of Steel Pipe Rotary Expanding

Based on the special setup mode of the rotary expanding rolls, a set of basic formulas for the rotary expanding is deduced, and the formation and changing characteristics of the feed angle is analyzed. The results demonstrate that: although the roll setting in rotary expanding process doesn’ t directly present the formation of the feed angle, the toe angle and the vertical movement of the rolls jointly lead to producing a feed angle, which makes the rotary expanding take on typical cross rolling characteristics; that the bigger the toe angle, the bigger the feed angle; the bigger the vertical movement distance of the rolls, the bigger the feed angle; the smaller the distance between rolling center line and the center of the basic circle, the bigger the feed angle; and that from the entrance to the exit of the deformation zone, the feed angle of each pass point on the roll surface changes widely from 7.5° to 3.0°.