3 Fundamentals of press design

Sheet metal forming lines
Table 4.4.1: Functional areas of machine and production data acquisition systems in large-panel
presses
Machine/production data acquisition and evaluation
automatic errors standstill job data,
acquisition – during production production data
– during die change
manual commentaries commentaries number of reject parts,
acquisition (plain language) (plain language), number of rework parts
classification
evaluations chronological list chronological list chronological list,
individual printout
(job data table)
sorting according to: sorting according to: sorting according to:
error frequency, standstill frequency, die number,
total duration, total duration, workpiece number,
error category frequency error category frequency batch size
and total duration and total duration
selection according to: selection according to: selection according to:
period, period, period,
shift, shift, shift,
job number, job number, job number,
die number, die number, die number
error number, standstill number,
error categories standstill categories
ent causes of standstill. The conditions of the ready-to-run status synoptic
form the basis for monitoring standstills.
An important function in monitoring standstill periods is the determination
of the actual cause of the standstill. The control system frequently
determines only the so-called secondary causes, in particular in
the case of manual operator intervention. The actual cause of the problem,
termed the primary cause, can be determined by the user by means
of event-related modification of the standard standstill classification
and by the addition of event-related comments.
The field of production data acquisition is subdivided into job data
acquisition and, based on this, production data determination. Job data
refers to the individual production orders. Its acquisition stops on completion
of the order, and the relevant data is stored (Fig. 4.4.47).
Job data is automatically acquired, supplemented by optional manual
inputs in the press control system. At the end of a shift, and at the
end of an order, the current data table is transmitted to the PMS. The
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