预制坯设计是锻造工艺设计中的重要内容之一。

Preform design is important for forging process design.

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预制坯体的纤维体积含量选为25％至30％为最好。

The proper fibre volume fraction of original is between 25% and 30%.

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分析了主动螺旋伞齿轮闭塞挤压的金属流动路线，设计了预制坯的形状。

In this paper, the metal flow route during closed die extrusion for spiral bevel driving gear of automotive final drive is analyzed and the profile of preformed blank has been designed.

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