在进行模具设计时，采用半球形凸模等方式可以实现正、反拉深在一套模具，普通液压机上完成加工。
In the die design, the use of spherical punch made the process of deep drawing and reverse redrawing achieved in one set of mold and common hydraulic press.
凸模用弹性夹套固定，模具对中性好，更换凸模方便。
The punch was fixed by a spring clamp sheath, so that the die was good coaxial and convenient for exchange of the punch.
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