3 Fundamentals of press design

256 Sheet metal forming and blanking
production/
operating data and
measured data
acquisition
central
control
and
visualization
local control
systems
local
visualization
production
line
central PLC
industrial PC
production line bus system
PLC PLC PLC AST PLC AST PLC AST PLC AST
destacker
printer
FEEDER
Fig. 4.4.42 Control structure of a crossbar transfer press
printer
STATION 1 Z STATION 2 Z STATION 3 Z STATION 4 Z STATION 5
crossbar transfer press
PLC: programmable, logic controller AST: axis control VIS: visualization Z: universal station (5 NC axes)
– reduced familiarization periods for the unit operators and maintenance
staff,
– simplified troubleshooting and maintenance,
– simple data link to higher-level systems.
The underlying characteristics of the electrical equipment and thus also
the press control system were described in Sect. 3.5. The explanation
provided here deals with the specific properties and functional characteristics
of the control system for the above-mentioned press type.
Operating modes of the press
The user has the following press operating modes available:
– Set-up: This mode is used for executing manual operations, for example
on initial press run-up, when restarting after a malfunction or
when running in new dies.
– Single cycle: One press cycle is executed at a low stroking rate.
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998