3 Fundamentals of press design

Principles of die manufacture
Fig. 4.1.22 Try-out center: try-out presses linked by T-tracks
out presses may be linked together with T-tracks (Fig. 4.1.22 and cf.
Fig. 3.4.4). This arrangement allows comprehensive testing of the progressive
forming operations so that die sets are more quickly and efficiently
run-in.
Try-out presses and above all try-out centers are also suitable for producing
short run parts or carrying on production on a smaller scale in
the event of the breakdown of a large production press. Depending on
the task they have to perform, such universal presses may be used, for
example, for production as well as for try-out purposes.
Parallel lift mechanisms
For any repairs and reworking operations, the top die has to be lifted off
the bottom die. For ergonomic (overhead working) and scheduling reasons
(working at the same time on the top and bottom dies) both dies
are laid down separately. Dies which cannot be handled manually can
be moved with the help of a hydraulic parallel lift mechanism. This
apparatus ensures quick clamping for repairs and maintenance of dies.
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