Tests are made with three different piercing plug cone shapes to identify shell gauge changes during secondary piercing process.

采用三种不同穿轧锥形状的顶头，通过二次穿孔试验研究了毛管壁厚变化。

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The causes on wrinkle occurrence on the working cone of piercing plug are analysed in detail, and the measures to prevent wrinkle occurrence are put forward.

详细地分析了穿孔顶头工作锥起皱的原因，提出了抑制顶头工作锥起皱的工艺措施。

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Linear deformation zone of generating wall can be obtained by means of non-linear cone Angle plug combined with the barrel-shaped rolls, so the wall accuracy can be increased greatly.

采用带有非线性顶头锥角的顶头与桶形辊相配合可以获得线性的成壁变形区，从而大大提高壁厚精度。

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