A compound is one that blanks and perforates a part at the same time and at the same station. In most cases a hole or holes are perforated down while the part is blanked up. This allows the slugs from those holes to fall through the die however, this leaves the part in the die requiring some means of part removal.
Compound dies are commonly run as single hit dies but can be run continuously with a feeder provided the part can be removed in a timely manner.
The advantages of building a compound die are;
1) Requires minimal space in the press.
2) Leaves all burrs in one direction.
3) Superior accuracy between holes and trim edges.
4) More economical to build than a progressive die.
A disadvantage of building a compound blank die is the limited space which ends to leave die components thin and weak. This concentrates the load and shock on punches and matrixes resulting in tooling failures.
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