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。
The utility model discloses an evaporation type condenser cooling pipe. The inner side of an elliptical chilled pipe body 1 is provided with a ribbed groove 2.
本实用新型公开了一种蒸发式冷凝器冷却管，它是在椭圆形冷却的管体1的内侧设有肋化沟槽2。
The utility model discloses an evaporation type condenser cooling pipe. The inner side of an elliptical chilled pipe body 1 is provided with a ribbed groove 2.
本实用新型公开了一种蒸发式冷凝器冷却管，它是在椭圆形冷却的管体1的内侧设有肋化沟槽2。
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