3 Fundamentals of press design

Presses used for solid forming
feed hopper
electronic
press
control
ejector
punch holder
blank control and
discharge device
Fig. 6.8.20 Horizontal minting press
monobloc press frame
punch holder
link drive system
dial feed plate
collar) within 2 to 3 min. The machine rests on vibration absorbing elements.
As a result, no more than 10 % of the static load is transmitted
into the foundation as dynamic loading. This means that the presses can
be set up on upper floors. These presses are generally equipped with
sound enclosures in order to minimize noise generation.
The coin blanks are fed towards a mechanical hopper via an inclined
conveyer with storage space or other metering systems (Fig. 6.8.22). The
hopper operates according to the centrifugal principle, which ensures
particularly gentle handling of the blanks. The possibility of scouring is
minimal, and noise development is also accordingly low.
The hoppers have a slight incline. The feed plate is directly driven by
an adjustable gear motor. The outfeed channel is tangentially located.
Depending on the diameter of the blanks, this arrangement permits
feed rates of up to 3,000 blanks/min.
When resetting for the production of different coin sizes, only the
blank outfeed channel and thickness need to be adjusted. No exchange
parts are required. Depending on the press design, the hopper and feed
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998
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main drive
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