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孔深比t/D≥1时、即孔径等于或小于料厚时为深孔冲裁。确切的说,在此前题下冲裁厚度在3mm以下为小孔冲裁,以上为深孔冲裁。深孔冲裁的方法已有资料介绍。但是当t大于8mm,t/D>1.3时。孔的冲裁难度很大。即使在模具结构上采取保护措施后,凸模的使用寿命也十分短暂。所以一般把它作为深孔冲裁的极限。对于超出此范围的深孔冲裁。当孔的尺寸精度要求不高,允许有塌角和斜度时,可采用热冲的方法。
Hole depth ratio t / D ≥ 1, that is, the hole diameter is equal to or less than the material thickness for deep hole punching. Exactly, in the previous issue of punching thickness below 3mm punched holes, the above for deep hole punching. Deep hole blanking method has been introduced. But when t is greater than 8mm, t / D> 1.3. Hole punching a great deal of difficulty. Even after the mold structure to take protective measures, the life of the punch is also very short. So it is generally used as the limit of deep hole punching. For deep hole blanking beyond this range. When the hole size accuracy is not high, allowing the slope and slope, you can use hot red method.