P
INCH
P
OINT
Definition
The pinch point (contact point) is the position of the beam which corresponds
to the moment when the point of the punch makes contact with the sheet
This point is not programmable, but is calculated by the DNC using the
calculation:
heet when an X backgauge
osely linked to
)
the sheet is not pinched during X backgauge retraction
b)
the sheet is bent too much during X backgauge retraction
To remedy these problems you must:
verify the sheet thickness and if necessary correct it
verify the reference and if necessary correct it
add a PP correction in paramete 37.
ifying the position of the PP is to program a sequence
ion (approx. 400 mm) and make a descent of the
beam stops on the sheet, it is thus
ently or too much.
imply interrupt the descent command before the end of retraction to prevent
e beam from bending the sheet. An ascent command frees it immediately
r another try.
For the softwares having the "PP correction" parameter, if the reference, the
tooling dimensions and material thickness are correct you can modify this
parameter in order to correct the PP (adjustment of the material clamping)
without interfering with the other points.
metal placed in the die.
REF Y
value and the sheet thickness.
The position is determined by the following
PP = REF Y + Th (sheet thickness).
The PP is used by the DNC cycle to maintain the s
retraction is programmed.
As we have seen at the beginning of this chapter, the PP is cl
the Y reference and the sheet thickness.
The following cases may occur:
a
r
A simple way of ver
with a very large retract
beam.
During the execution of the retraction, the
easy to control if the sheet is pinched suffici
S
th
fo
PAGE 60
USER GUIDE DNC 600S
Summary of Contents for DNC 600S
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