3 Fundamentals of press design

152 Sheet metal forming and blanking
Fig. 4.1.21
Rotating the slide of a hydraulic
try-out press
upper stop position. After being taken out of the back of the press on
the pallet truck, the top die is accessible from all sides. This allows convenient
and time-saving reworking to be carried out. After reverse rotation,
the die does not need to be repositioned as it is already positioned
by the clamping plate on the pallet truck.
The electrical system of a try-out press includes a sensor system for
measuring the setting parameters for each die. Sensors for measuring
various process parameters and a data acquisition system allow to perform
statistical evaluation. The optimal setting parameters are saved
and made available as input into the control system of the production
press. In order to achieve production-like conditions in hydraulic tryout
presses, any elastic deformations or off-center movements of the
slide, which are detected at the die and the production line must be
considered by the control system.
During run-in, the dies need to be frequently moved in and out of
the press. A moving bolster allows this work to be carried out faster and
more safely (cf. Fig.3.4.3). In a try-out center for example, several try-
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998