Measures for avoiding wrinkle has been considered after analysing the stress and strain of metal during drawing process.

通过对其拉延成型过程中，金属的应力应变的分析，提出了防皱措施。

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With the pre-stress in the membrane increasing, the wrinkle quantity increases, but the wrinkle amplitude drops. The flatness of the membrane surface increases a little.

随着膜面预应力的增大，膜面上的褶皱数略有增大，褶皱幅度有所减小，膜面平整度有所提高。

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