The spacial curve is continuous which is formed by straightener roll and tube(bar)tight contact.This curve is taken as generatrix,and is circumgyrated around the axes of straightener roll.

• 矫直辊与管(棒)材紧密接触并形成的空间曲线是连续的,以此曲线为母线绕矫直辊轴线旋转所得的旋转曲面即为矫直辊辊形的曲面。