OIL-HYDRAULIC PRESSES WITH TWO UPRIGHTS
OPERATION AND MAINTENANCE MANUAL
23
6.3.2
CONTROL OF THE BLANK HOLDER CUSHION
The blank holder cushion position along its stroke is
displayed on the INDUSTRIAL PC. This electronic
instrument allows to set all the cycle parameters (T.D.C.;
B.D.C.; etc.) and moreover 3 auxiliary cams (AUX4;
AUX5; AUX6) are available.
The most significant parameters are described here
below:
T.D.C............... This determines the T.D.C. and that is
the cushion stopping point during the
upstroke.
Value variation.. 5 values can be set using the keyboard
of the INDUSTRIAL PC; these are used
to determine different values of counter
force of the blank holder cushion during
its downstroke (this should be
numerically higher than the previously
set value).
B.D.C.. ............ This determines the cushion B.D.C. (this
should be numerically higher than the
previously set value).
Overstroke pressure-switch:
each machine model is equipped with a limit-switch which has a safety
function at T.D.C.
If the above-mentioned limit-switch intervenes, the auxiliary circuits of the
machine will be de-activated. Re-start the main motor, activate the manual
downstroke of the cushion and find the cause of the alarm.
NOTE :
To insert the data of the blank holder cycle cams refer to the programming manual of the
INDUSTRIAL PC.
microswitch
T.D.C.
B.D.C.
DOWNSTROKE UPSTROKE
CUSHION
T.D.C. extra-stroke
Cushion value
variation in 5 points
AUX 4
AUX 5
AUX 6
AUX 4
AUX 5
AUX 6
