拉深系数（m）是以拉深后的直径d与拉深前坯料D（工序件dn）直径之比表示。拉深系数m表示拉深前后坯料（工序件）直径的变化率。
拉深系数是影响拉深件质量的关键因素。
The drawing coefficient is a key factor which can influence the quality of drawing parts.
因此，进行圆筒件极限拉深系数的优化设计十分必要。
Thus, the optimization design for the limiting drawing parameter of the cup-drawing process is very necessary.
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.
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