annular ribbed pipe 环形肋管
helical ribbed pipe 螺旋肋管
spiral internal-ribbed pipe 内螺旋凸筋管
Parallel inclined inner ribbed pipe 并联倾斜内螺纹管
ribbed heating pipe [建] 肋形暖气管
ribbed wall pipe 加筋管
crescent ribbed y-pipe 内加强月牙肋岔管
The formulas of drawing force for spiral internal-ribbed pipe cold-drawing are derived with upperbound method.
利用上界法推导了冷拔内螺旋凸筋管拔制力计算式。
The experiment result shows that the theoretical values are close to those measured, which provides a theoretical basis for internal-ribbed pipe cold-drawing equipment type selecting.
实验表明，理论计算值与实测值较吻合，可为冷拔内螺旋凸筋管的拔制设备选型提供理论依据。
The main reinforcing rib is protected against being destroyed in the processing and applying process, thereby enhancing the ring stiffness of a straight ribbed pipe wound by glass-reinforced plastics.
保护了主加强肋在加工应用过程中不会受到破坏，从而提高塑钢缠绕直肋管的环刚度。
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