The reasonable shape of the blank can improve the formability of the sheet metal, make full use of the material, decrease the work of finishing repair.

合理的选择板壳零件的毛坯外形，可以提高板料的可成形性，同时也提高了材料的利用率，减少成形后的修边工作量。

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Blank design plays an important role in the process design of sheet metal drawing due to its great impact on the formability of a part.

毛坯外形设计是工艺设计的重要环节，它直接影响工件的成形质量。

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It can improve the formability of sheet, make full use of material and improve productivity to precisely calculate the blank shape for sheet metal forming.

较准确地计算毛料外形，可以提高板料的可成形性、材料利用率和生产率。

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