The results show that the drawing formality of round corner rectangularblank is better than that of other blank shapes.
结果表明：使用矩形圆角坯料比其他坯料的成形性能好。
2
In order to prove that the optimum blank had better formality than the general rectangularblank, both finite limit diagrams were compared.
通过对比一般方形毛坯和优化毛坯的成形极限图，证明优化毛坯具有更好的成形性。
3
The composition of rectangular box deep drawing system of divided variable blank holder force (VBHF) was discussed, its principle and work process of each portion were analyzed.