3 Fundamentals of press design

Fine blanking
Fig. 4.7.22 Two-station compound progressive fine blanking die with part transport by means
of transverse shear pusher:
1 st station: processing sequence in vertical direction – cup drawing by blanking
and drawing
2 nd station: processing sequence in vertical direction – setting cup radii, piercing
inner form, trimming outside toothing. Active elements are structured in ring formation
and coated
The ejector 3 is guided in the blanking plate. The ejector in turn guides
the inner form punch 5. Via pressure pins 7 and pressure pad 11, counterpressure,
i.e. ejection force, is applied to the ejector 3.
In lower die-set 17, the guide plate or vee-ring plate 4 is mounted
directly on the frame, positioned and fastened. The moving punch 1,
which is connected to the press via the punch base 12, runs in guide
plate 4. The inner form slugs are ejected by the press hydraulic system
via pressure pins 7 of ejector bridge 13, and the inner form ejector pin
6 from punch 1. The upper die-set 16 and lower die-set 17 are precisely
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998
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