The maximum height of wrinkling wave does not almost alter with the increase of the initial lead of the mandrel when the initial lead reached a fixed value.

当芯棒伸出量达到一定值后，随着芯棒伸出量的增大，起皱波纹高度极大值变化不明显。

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The maximum height of wrinkling wave does not almost alter with the increase of the initial lead of the mandrel when the initial lead reached a fixed value.

当芯棒伸出量达到一定值后，随着芯棒伸出量的增大，起皱波纹高度极大值变化不明显。

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