利用上界法推导了冷拔内螺旋凸筋管拔制力计算式。
The formulas of drawing force for spiral internal-ribbed pipe cold-drawing are derived with upperbound method.
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 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.
在某些情况下，把一个螺旋形进一步分解成凸子集是必要的。
In certain case it might be necessary to further decompose a spiral into convex subsets.
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