DSP LASER AP with MCS
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8.2.
Operating cycle of a press brake
Here below is reported the operating chart of a work cycle for a hydraulic press brake with
downstroke of the upper table.
Cycle State
Centers and phases of
the cycle
Cycle
HIGH SPEED
DOWNSTROKE
PMSM
Maximum Top Dead Centre
PMS
Top Dead Centre
Deceleration ramp
PCV
Speed change point
LOW SPEED
Sheet contact point
DOWNSTROKE
PD
Decompression point
PMI
Bottom Dead Centre
The normal operating cycle foresees the start from the top dead centre (PMS), which does
not necessarily coincide with the maximum top dead centre (PMSM). In fact, in order to
minimize the down time, the stroke of the moveable table is usually limited to the lowest
possible value, compatibly with the shape, the size and the bends to execute on the part.
The synchronized axes of the moveable crossbeam are named Y1 and Y2.
The pressure of a maintained contact device (usually a pedal) issues the High Speed (more
than 10 mm/s) closing movement up to PCV, where the speed automatically decreases to a
value lower than or equal to 10 mm/s, defined Low Speed.
For special machining or maintenance operations requiring it, the machine is forced to Low
Speed even in the part of the stroke the tool usually covers in High Speed, with the aim to
deactivate the safety systems which, executing their task, would stop the downstroke. This
speed limit is kept for all the closing stroke under the PCV until the press action which takes
place within the PMI. Once ended the decompression, the punch can return to the
PMS/PMSM, automatically or by the upstroke pedal.
Information
:
The decompression phase belongs to the Low Speed downstroke, but
with opposite direction. By the ING5 input, the system informs MCS that
the machine is executing the decompression.
The activation of the safety outputs of MCS device, dedicated to the control of the
movement of the moveable crossbeam, can be configured according to the following states
of the working cycle of the press brake:
•
High speed dowstroke
•
Low speed downstroke
•
Stop
•
Upstroke
16
DLAM01EN
Summary of Contents for DSP LASER AP
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