7 Press processes
SCHMIDT
®
PressControl 3000 – V1.3
27
The stroke takeover is monitored in two channels by means of
•
a pressure switch, which monitors the lower pressure chamber and
•
a cylinder switch in the bottom dead centre (BDC)
The pressure switch has been set to a fixed value ex works and must not be
adjusted.
Set the cylinder switch for the stroke takeover. For further information,
please refer to chapter “3.7 Setting the press stroke takeover” of the
“Operator's manual – SCHMIDT PneumaticPress”.
Check if the control unit settings for the existing cylinder switch(es) are
correct.
If necessary, adapt the “BDC signal (l1.3) exist.” parameter and the
“TDC signal (l1.4) exist.".
The stroke takeover is monitored in two channels by means of
•
a pressure switch, which recognises the switchover from rapid
approach stroke to power stroke and of
•
the “BDC stroketakeover” parameter in the Press Control 3000
control unit.
The pressure switch has been set to a fixed value ex works and must not be
adjusted.
The “BDC stroketakeover” parameter has to be set in such a way that
the dangerous closing movement is finished upon reaching this
position.
7.2 Optimisation of the press process
Bend-Up (Yield Factor)
Every press system has a force-dependent deflection. This results from the
elastic deflection of the machine, the tool, and the workpiece.
For stroke-dependent press operations without a positive stop (freely
positioned), possible bend-up may lead to positioning errors due to
dispersion of the press forces. Positioning accuracy in the range of 0.01 mm
are practically impossible to attain without compensation of the deflection
constants.
The drive control calculates the axis-specific and application-specific
deflection constant in real-time. The representation of the deflection in the
following figure is strongly exaggerated.
PneumaticPress
HydroPneumaticPress
