Progressive die: The dies which performed two or more
operations at different stages every time the ram descends is known as
Progressive die.
The principle advantage of Progressive die is in the number of
operations that can be achieved with one handling of the stock strip. The main
disadvantage is that work pieces may become “dished” as they pushed through the
die as they generally have very little support.
Compound die: A compound die differs from a progressive
die in that it performs two or more cutting operations during one stroke of the
press at one station only.
Compound dies are slower in operation than progressive dies but they
have advantages for certain jobs, especially where tolerance are close (1) the cutting operation, by the action of the
knockout plate ,ensures flatness of the blank.2 Large parts can be blanked in a
smaller press if compound dies rather than progressive dies are used.
Combination dies: A die
in which a cutting operation is combined with a noncutting operation is
referred to as a combination die. The cutting operations may include blanking,
piercing, trimming, and cutoff and are combined with noncutting operations
which may include bending, extruding, embossing, and forming
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