采用变压边力可以明显提高板材的冲压性能，极限拉深比将达到5.0。
Using variable blank holder force can remarkably improve the forming performance, and the limiting drawing ratio would reach 5.0.
通过拉深工艺试验证明该曲面凹模可以达到很小的极限拉深系数。
And it is proved that it can reach smaller limit drawing ratio by the deep drawing experiments.
分析结果表明，拉深孔排列规律、密度和孔径变化对板料的极限拉深高度有很大影响。
The results indicated the arrayed rule, density and diameter of the drawing holes affect the limit drawing height of sheet metal drastically.
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