Punching machines

Control of the hydraulic axis

The punching operation is the impression of a sign or a shape on a metal surface by pressing an instrument called “punch”.

Nowadays such a technique is frequently used by mechanics for the metal forming. The use of automatic machines to cut and bore metal plates through very complex cutting and shaping processes, whose cycles are getting faster and faster, gave rise to the need of specific cards for the control of the punching axis.

For this specific application Duplomatic developed the EWM-S-B*/10 digital card for the control of the hydraulic axis; the accuracy of the feedback signal is equal to 0.01% while the sampling time of the control loop corresponds to 1 ms.

Via three selectable inputs (programmable binary code) it is possible to combine the card through the PLC with 8 positions and with the punching speed.

The same card can control directly the valves with integrated electronics with a voltage reference of +/- 10V or a current reference of 4-20mA.

It is furthermore possible to use an on-board drive for the direct control of the solenoids of the proportional valve.

The position loop with feedback can manage 0-10V or 4-20mA analog signals.