The double radius hole type was commonly adopted for the forming machine of straight weld pipe with vertical roller in domestic present.
目前，国内带有立辊组的直缝焊管成型机大都采用双半径孔型。
2
Straight generatrix shape roller and arc generatrix shape roller are incompletely the same in processing.
形母线与圆弧形母线滚子，在采用无心贯穿磨削时，并不完全相同。
3
The processed cruving and straight edge can be trimmed by the square roller from the top and bottom at the same time with fine, Evenness and precision.