用温差拉深工艺成形深筒形件能大幅度降低拉深系数，减少拉深次数，降低生产成本。
Differential temperature drawing in deep sleeve parts can reduce coefficient and times of drawing, then cut down the cost.
材料性能参数和摩擦系数的实时识别是实现拉深过程智能化控制的关键。
The real-time identification of material properties and friction coefficient is as the key to intelligent control of deep drawing process.
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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