3 Fundamentals of press design
3.5 Press control systems 3.5.1 Functions of the control system
Th e fu n ct io n s p erfo rm ed by p ress co n t ro l syst em s in clu d e t h e read in g o f sign als an d d at a t ran sm it t ed fro m t h e co n t ro l elem en t s an d sen so rs
lo cat ed o n t h e m ach in e an d t h eir co n versio n in t o co n t ro l co m m an d s t o t h e m ach in e’s act u at o rs. Th e gen erat io n o f co n t ro l co m m an d s
d ep en d s o n t h e select ed o p erat in g m o d e su ch as “set -u p ”, “au t o m at ic d ie ch an ge” an d “au t o m at ic co n t in u o u s o p erat io n ”.
Fu n ct io n s t o be m o n it o red o r in it iat ed in clu d e, fo r exam p le, safet y d evices, clu t ch brake, m ain d rive syst em , lu bricat io n , d raw cu sh io n s,
d ie clam p s, m o vin g bo lst ers, p art t ran sp o rt an d au t o m at ic d ie ch an ge. In ad d it io n , t h e co n t ro l syst em execu t es m ach in e fu n ct io n s an d fau lt
d iagn o st ics.
3.5.2 Electrical components of presses
Th e elect rical co m p o n en t s o f p resses an d t h eir p erip h erals are bro ken d o wn in t o t h ree m ain areas:
– o p erat in g an d visu alizat io n syst em , – elect rical co n t ro l lo cat ed cen t rally in t h e swit ch cabin et o r d ecen -
t rally d ist ribu t ed in t h e u n it , – sen so rs an d act u at o rs in t h e p ress.
Metal Forming Handbook Schuler c Springer-Verlag Berlin Heidelberg 1998
3.5.3 Operating and visualization system
Pro cess visu alizat io n is an in st ru m en t wh ich m akes t h e p ro d u ct io n seq u en ces o f m ach in es an d p lan t s ergo n o m ically accessible. It su p p o rt s
t h e o p erat io n , o bservat io n an d m o n it o rin g o f t ech n ical p lan t an d eq u ip m en t . Th e co n t ro l u n it s are p o sit io n ed in vario u s lo cat io n s
aro u n d t h e m ach in e an d are basically bro ken d o wn acco rd in g t o t h ree cat ego ries:
– free-st an d in g o p erat o r co n so les, – o p erat o r st at io n s p erm an en t ly in t egrat ed in t h e m ach in e
Fig. 3.5.1 an d
– m o vable p en d an t o p erat o r st at io n s.
95
Press control systems
Fig. 3.5.1 Operator station
Metal Forming Handbook Schuler c Springer-Verlag Berlin Heidelberg 1998
Co n t ro l fu n ct io n s can be su bd ivid ed in t o cen t ral an d lo cal syst em s: cen t ral co n t ro l fu n ct io n s refer t o h igh er-level p ress fu n ct io n s, wh ile
lo cal co n t ro l fu n ct io n s are u sed fo r m an u al o p erat io n o f in d ivid u al fu n ct io n s d irect ly at t h e p ress.
Co n t ro l u n it s are co m p rised o f in p u t an d d isp lay u n it s fo r o p erat io n an d visu alizat io n an d can ran ge fro m sim p le keys wit h p ilo t lam p s
t h ro u gh t o in d u st rial PCs wit h h igh -reso lu t io n co lo r m o n it o rs. Th e m ain fu n ct io n o f t h e visu al d isp lay syst em is t o su p p o rt t h e p ress o p er-
at o r o n st art -u p an d rep eat st art -u p o f t h e p ress, fo r exam p le fo llo win g a d ie ch an ge o r m ach in e fau lt , an d t o p erm it t h e in p u t o f vario u s o p er-
at in g p aram et ers Fig. 3.5.2
. In ad d it io n , t h e visu al d isp lay syst em can be u sed t o st o re d ie an d m ach in e d at a an d fo r lo ggin g fu n ct io n s. In fo r-
m at io n syst em fu n ct io n s wh ich are in t egrat ed in t o t h e visu al d isp lay syst em o ffer t h e u ser su p p o rt bo t h fo r m ain t en an ce wo rk an d t ro u -
blesh o o t in g. Th ere is an in creasin g t en d en cy fo r t h is t yp e o f syst em t o m ake u se o f m u lt i-m ed ia t ech n o lo gy cf.
Sect . 4.6.7 .
96
Fundamentals of press design
Fig. 3.5.2
Tooling data input mask for cam values
Metal Forming Handbook Schuler c Springer-Verlag Berlin Heidelberg 1998
3.5.4 Structure of electrical control systems
