该模具的成功应用，拓展了有芯管子冲孔的加工工艺范围。
This die success application, develope the core pipe punching hole processing scope.
分析了管材无凹模冲孔的工艺特点，提出了该类模具设计的要点。
The technical characteristics of no-female die piercing on pipe were analyzed and the key points in design of a practical no-female die piercing die were presented.
分析了焊缝管冲孔的特点，通过实例介绍了该焊缝管冲孔模设计思路。
Give an analysis about the features of a welding seam pipe's piercing, and introduce the design clew of the welding seam pipe's piercing die using an instance.
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