radius of the roller 滚子半径
HEAD PULL : Green roller defect caused by improper machine timing; results in nick or indent of large end of radius.
端部撕扯：由于不正确的设备节奏而导致的在大端面处形成的凹刻痕状滚子毛坯缺陷。
NIB : Green roller defect on the small end radius; caused by taper die failure. A sharp protrusion on the small end of the roller.
由于圆锥模具缺陷造成的半成品滚子小端倒角缺陷， 滚子小端有尖锐的突出。
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。
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