Page 4 - Industrial_EN

APPLICATION BENDING MACHINE

Hydraulic systems in ultra-modern bending machines are nowadays implemented using
proportional valves and intelligent electronics to flexibly parameterise the various bend-
ing processes. In addition to exact cylinder positioning, safety-relevant requirements, that
are monitored and ensured in redundant systems with sensors, must also be taken into
account.

FUNCTION
On large bending machines, two hydraulic cylinders that move
the beam with the bending punch vertically are mounted on
each side. Fast and monitored proportional spool valves are
used for the exact positioning of the bending punch. The signal
of the integrated spool position control (LVDT) is used for fast
and precise adjustment of the valve spool and for monitoring
its position in the valve. To guarantee exact movement dur-
ing bending, the two cylinders and thus also the proportional
valves must run synchronously. The superordinated electron-
ics regulate and control the motion sequences. Thanks to the
on-board DSV electronics, the valve is already set at the facto-
ry, making commissioning easy.

COMPONENTS
Proportional control valves are the main element in the appli-
cation. The WDRFA06 has an on-board DSV electronics with
an integrated spool position control system (LVDT). Smaller
axes can be implemented with the smaller valve version, the
compact NG4-MINI control valve. The parameter sets are opti-
mally tuned to the application and are pre-set and tested at the
factory. To ensure that the two cylinders move at a controlled
speed and position the bending punch quickly and accurately,
a superordinated electronic controller card is required.

SPECIALITIES
• Customer-specific adaptations to valve and electronics
• Defined parameter sets factory set
• Various valve executions including fieldbus connection
• Control via superordinated PLC possible

PAGE 2 | WANDFLUH INDUSTRIAL | APPLICATION | BENDING MACHINE