The traditional design method of the crescent rib on the screw-threadsteel finished product passes is very overelaborate and the results obtained based on it have some errors.
螺纹钢成品孔月牙肋的传统设计法不仅繁琐，并且据此而得出的结果有误差。
2
The influence of coverage due to the radius, angular velocity, pitch , double thread of plastic screw, and rotational mode of steel axis are also discussed in here.