3 Fundamentals of press design

Sheet metal forming lines
4.4.6 Transfer presses for small and medium sized parts
Mechanical and hydraulic transfer presses are used for the manufacture
of ready-to-assemble components for the automotive industry, its suppliers,
the electrical and household appliance sectors, and other
branches of industry (Fig.4.4.23). These presses guarantee high output
rates because all forming operations required to manufacture a workpiece
are included in one and the same line. Furthermore, all these
operations are performed nearly simultaneously. A part is completed
with each stroke of the slide, irrespective of the number of die stations
in use.
Transfer presses are either supplied from stacks of blanks from the
blanking line (Fig. 4.4.15) or they process stock directly off the coil (cf.
Fig. 4.3.1). In the former case, the press is equipped with a destacker; in
the second it is equipped with its own coil line including decoiler,
straightener and feed system. By locating the shearing station for blank-
Fig. 4.4.23 Mechanical transfer press for the production of wheel hubs
nominal press force: 42,000kN; number of stations: 11; feed pitch: 700mm;
slides: 3; strokes per minute: 10-28
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