The traditional design method of the crescent rib on reinforced bar finished product pass was fussg and inerrant, so it canit satisfy the over all size reqment to reinforced bar.

• 螺纹钢月牙肋常规设计法,不仅有误差,而且繁琐,不能适应国标对螺纹钢有关外形尺寸的要求。采用无扩张弧的成品孔型及相应的简便且无误差的计算法,从而解决了问题。