The die shown in Fig. 362, known as a reversed die, is extensively used in many shops for heavy punching on such work as washers, ball seats, etc. Under many conditions, it works much better than a gang die, and it is simpler to make than a compound die. The punch A is made the size of the diameter of the washer to be produced, and is hollow to receive the punch B which produces the hole. The scrap from B passes up through the punch A and through the outlet shown. The washer blank remains in the die C until forced out by the ejector 2), which is automatically operated by the press.

Method of Hardening a Redrawing Die.

Fig. 361. Method of Hardening a Redrawing Die.

Compound Dies

In Fig. 363 is shown a die used in producing a washer and punching a hole in it at one operation, thus insuring a blank with a hole that is exactly central. The work from a die of this description is better than that done by the gang die. It is especially adapted for thin sheet metal, paper, and mica parts.

The upper die A receives the lower punch B, while the lower opening C receives the upper punch D. The stripper E forces the blank out of the die; while the stripper F forces the sheet off the punch B.

Fig. 382. Reversed Die.

The die shown is for punching a round washer, but the tool may be made for producing pieces of complicated and irregular form. It proves especially valuable when used in connection with a sub-press.