metal application en

Case History

GEFRAN - All rights reserved

Machine Metal Cutting line

Market Metal processing

GEFRAN Solution N. 23 inverter ADV200 various sizes from 1,5 to 355Kw for the line

N. 1 servo drive XVyA-EV of 630Kw Rotating shear

N. 1 DC power supply SM32 - 3000A

Section: METAL CUTTING LINE

Application Rotating Shear

Case History


GEFRAN Solution

Section: ROTATING SHEAR

Case History


GEFRAN Solution

Section: ELECTRICAL CABINET

Case History


GEFRAN Solution

This line is equipped by asynchronous motors and inverter ADV200 series

powered through a common DC bus. : the Rotating shear side is managed

by a Servo drive XVyA-EV series.

The “Rotating shear” is a transversal cut system with the material in

motion.

Since the cut must be done with no difference of speed between the blade

and sheet metal, a dedicated control system is necessary for the

movement of the blade and the sheet metal.

With reference to the above figure, the principle of operation is as follows:

A blade rotates counterclockwise on a drum called plate blade holder.

The sheet moves at constant speed from right to left.

During its circular movement, the cut takes place when the blade is in

contact with the sheet: this is the point of beginning of the cutting.

The movement of the drum is adjusted to ensure to cut to the length

value defined.

Comparing to the sheet metal, the speed of the blade depends on the

rotating speed of the drum and it depends also on its angle with respect to

the dead higher point (P.M.S.).

In order to get a perfect cut, the speed of the drum is regulated to have

the projection of the speed of the blade on the sheet metal same as the

real speed of sheet metal.

A gap is set from the lower dead point (P.M.I) to move the peace of the

sheet metal cut from the blade.

The movement of the drum is controlled through a metric wheel placed on

the sheet metal.

Case History


Servo drive XVyA-EV series is available with dedicated application

firmware cutting system “rotating shear”.

XVyEV servodrive read encoder info from the motor and the marker.

Those values are needed to control the position of the drum blade holder.

A second encoder is installed on the metric wheel.

The cutting sequence and all the related parameters (length of the cut,

etc.) are managed by the PLC through field bus.

The use of the XVyEV servo drive with special dedicated application

firmware has multiple advantages compare to the use of a standard drive

with separated axis control:

- Speed loop time = 2ms

- No analog communication between drive and axis board.

No noise on the speed reference

- Same Configurator tool for drive parametrization and application

parameters setting: GF_eXpress

- Digital scope integrated into GF_eXpress to monitor all the drive

and application variables

- Less components in the electrical cabinet

- Less spare parts needed

Case History


“Rotating shear”:Performance data

Thickness metal sheet from 0,5 to 3,0mm, width max. 2150mm

Length of cut (mm): from 500mm to 12000mm

Line speed from 22 to 60m/min

Cut/min from 5 to 45

Thickness metal sheet from 3,1 to 6,0mm, width max. 2150mm

Length of cut (mm) from 500mm to 12000mm

Line speed from 22 to 40m/min

Cut/min from 3 to 45

It has been performed Rotating shear systems with line speed up to

120m/min and thickness metal Sheet up to 8mm.

Advantages

No external axis system are needed. All the control system is

completely integrated into XVYEV servodrive. Speed loop time

performed is less than 2ms. This allows the machine to reach very high

performance never reached in the past.

metal application en

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