3 Fundamentals of press design

Principles of die manufacture
because of their geometrical dimensions are alternatively produced on
transfer sets.
Next to the dies already mentioned, a series of special dies are available
for special individual applications. These dies are, as a rule, used
separately. Special operations make it possible, however, for special dies
to be integrated into an operational sequence. Thus, for example, in
flanging dies several metal parts can be joined together positively
through the bending of certain metal sections (Fig. 4.1.4 and cf.
Fig. 2.1.34). During this operation reinforcing parts, glue or other components
can be introduced.
Other special dies locate special connecting elements directly into
the press. Sorting and positioning elements, for example, bring stamping
nuts synchronised with the press cycles into the correct position so that
the punch heads can join them with the sheet metal part (Fig. 4.1.5). If
there is sufficient space available, forming and blanking operations can
be carried out on the same die.
Further examples include bending, collar-forming, stamping, fine
blanking, wobble blanking and welding operations (cf. Fig. 4.7.14 and
4.7.15).
1 2 3
blank holder
pressure block
inner door
outer door
seaming bed
tilting block
Fig. 4.1.4 A hemming die
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998
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