该计算式可用于圆管空拉拔制力计算。
The formula is therefore considered as available to the calculation of drawing force on tube sinking.
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.
采用工程法推导了冷拔内直筋管拔制力的计算公式。
The formula of drawing force for cold-drawn inner fin tube is derived with slab method in this paper.
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