7 Press processes
SCHMIDT
®
PressControl 3000 – V1.3
29
Before - After
Press another workpiece and record the force/stroke curve again.
10.00
20.00
30.00
40.00
s[mm]
2.00
1.50
1.00
.500
0.0
F[kN]
Figure 7-3: Force curve before and after deflection compensation
After deflection compensation is performed, the elastic properties of the
entire system (machine, tool, workpiece) will be eliminated in each
press operation in real time.
Wrong parts evaluation
The maximum stroke (s
max
) separates the working stroke from the return
stroke. An overcompensation can result in a shift of s
max
within the force
curve.
If a return stroke tolerance in the diagram is above s
max
, it is (by definition)
part of the working stroke. Consequently, the measured value will not pass
correctly through the tolerance window, so that "O.K." parts will be identified
as "Not O.K. " parts.
Avoid
an
overcompensation.
Make sure to place the tolerance in a "safe" area, in which the
measured value will pass correctly through the tolerance window in
any case.
By definition, the return stroke begins after reaching of s
max
.
9.17
18.34
27.52
36.39
s[mm]
2.00
1.50
1.00
.500
0.0
F[kN]
W1
Figure 7-4: Stroke tolerance of the return stroke
Overcompensation (increased factor of deflection constants in mm/kN) may
lead to a shifting of s
max
within the force curve.
s
max
Overcompensation
ATTENTION
!
