3 Fundamentals of press design

532 Solid forming (Forging)
clamping lever stop cylinder
lift cylinder
off-size
blanks
Fig. 6.8.23 Automatic circular blank control and discharge device
sensor
correct
blanks
amplifier with peak value memory to the programmable logic controller
for evaluation. The pulses are counted after the coining force
exceeds a certain minimum value. This ensures that only coining
processes which have really been carried out can be picked up and
counted. At the same time, the coining force is displayed and monitored
relative to a preset limiting value. In case of a force value that is
above or below the prescribed tolerance limits, the coining press is
automatically switched off.
In the case of vertically operating presses, the blanks are fed via a channel
into a filling pipe. From here, they are pushed into the indexed
plate by means of a cam-controlled feeding device (Fig. 6.8.24). The drive
is equipped with a backlash-free mechanical indexing gear with
extremely high indexing accuracy and optimum acceleration and
deceleration characteristics. The indexing gear is enclosed and runs in
an oil bath.
To protect the indexing drive against overloads which are not
process-related, all coining presses are equipped with a synchronous
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998