SMS Siemag AG - Alu-web.de
SMS Siemag AG - Alu-web.de
SMS Siemag AG - Alu-web.de
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ALUMINIUMwALzINDUSTRIe<br />
Visuelle Kontrolle von Arbeitswalzen<br />
Laser zeigt Rattermarken und walzenabdrücke<br />
Die LDV Laser und Lichtsysteme GmbH<br />
mit Sitz in Lünen hat ein System für die<br />
visuelle Kontrolle von Arbeitswalzen entwickelt,<br />
das mithilfe eines Lasers feinste<br />
Unregelmäßigkeiten in <strong>de</strong>r Oberfläche<br />
<strong>de</strong>r Walzen sichtbar macht. So stellt das<br />
System sicher, dass beim Schleifen <strong>de</strong>r<br />
Walzen Fehler auf ihrer Oberfläche erkannt<br />
wer<strong>de</strong>n, bevor sie Bandmaterial<br />
unbrauchbar machen.<br />
Arbeitswalzen von Walzgerüsten, mit <strong>de</strong>nen<br />
Metallband gewalzt wird, spielen im wahrsten<br />
Sinn <strong>de</strong>s Wortes eine wichtige Rolle im<br />
Produktionsprozess. Sie reduzieren nicht nur<br />
die Banddicke, son<strong>de</strong>r übertragen eine klar<br />
<strong>de</strong>finierte Oberflächenstruktur auf die Bandoberfläche.<br />
Wer<strong>de</strong>n beim Schleifen <strong>de</strong>r Walzen nicht<br />
alle Oberflächenfehler beseitigt, wer<strong>de</strong>n diese<br />
beim Walzen ebenfalls auf das Band übertragen.<br />
Diese Fehler, die sich auf <strong>de</strong>m Band<br />
meist als Rattermarken o<strong>de</strong>r Walzenabdrücke<br />
darstellen, wur<strong>de</strong>n bisher erst am En<strong>de</strong> <strong>de</strong>s<br />
Walzprozesses bei <strong>de</strong>r automatischen o<strong>de</strong>r<br />
visuellen Inspektion <strong>de</strong>s Bandmaterials erkannt,<br />
o<strong>de</strong>r oft sogar erst im Labor.<br />
Sichere Erkennung: Auf <strong>de</strong>r Projektionsfläche sind<br />
Oberflächenfehler – hier Rattermarken – <strong>de</strong>utlich<br />
zu erkennen<br />
Reliable <strong>de</strong>tection: the projected image clearly<br />
shows any <strong>de</strong>fects of the roll surface – in this<br />
case, chatter marks<br />
Visual inspection of work rolls<br />
Laser makes chatter and roll marks visible<br />
Einfache Bedienung: Mit <strong>de</strong>m iLux System wer<strong>de</strong>n Arbeitswalzen mit einem Durchmesser von 40 bis 100<br />
mm geprüft / Easy to use: the iLux system inspects work rolls with diameters from 40 to 100 mm<br />
LDV Laser und Lichtsysteme GmbH in<br />
Lünen, Germany, has <strong>de</strong>veloped a visual<br />
laserbased inspection system for work<br />
rolls, which makes smallest irregularities<br />
of the roll surface visible. The system ensures<br />
that <strong>de</strong>fects on the surface of rolls<br />
are <strong>de</strong>tected during roll grinding. This<br />
prevents any improperly repaired rolls<br />
from damaging the strip.<br />
The work rolls in rolling stands are crucial to<br />
the production process and the quality of the<br />
metal strip being rolled. Work rolls reduce<br />
the strip thickness and give the strip surface<br />
a clearly <strong>de</strong>fined structure.<br />
If in the roll grinding process not all <strong>de</strong>fects<br />
are eliminated from the roll surface,<br />
these <strong>de</strong>fects will later on leave marks on the<br />
strip – which usually show in the form of chatter<br />
or rolling marks. In the past, such <strong>de</strong>fects<br />
were only <strong>de</strong>tectable at the end of the rolling<br />
process by automatic or visual inspection of<br />
the rolled strip, or often at an even later stage<br />
– in the laboratory.<br />
Now, the iLux roll inspection system makes<br />
<strong>de</strong>fects on the roll surfaces visible as early as<br />
during grinding in the roll shop. This has the<br />
advantage that the <strong>de</strong>fects can be securely removed<br />
before the rolls are reinstalled in the<br />
rolling stand.<br />
The principle is strikingly simple: The laser<br />
module illuminates a narrow section of about<br />
70 mm length on the roll surface. The light<br />
band is projected onto a white surface, which<br />
shows an image of the roll surface structure<br />
with up to 40 times magnification. Any irregularity<br />
in the surface structure immediately<br />
leaps to the eye.<br />
Defects on the roll surfaces can be <strong>de</strong>tected<br />
at a glance and the operator immediately sees<br />
whether he has ground off enough material to<br />
remove all <strong>de</strong>fects or whether he has to continue<br />
grinding.<br />
The iLux system also has a positive effect<br />
on the service life of the rolls. So far, it was<br />
necessary to remove rather more than less<br />
material from the roll surface to make sure<br />
that all <strong>de</strong>fects were completely gone. Now, it<br />
is sufficient to remove just as much material<br />
as nee<strong>de</strong>d to eliminate the <strong>de</strong>fects. This saves<br />
roll material and markedly extends the lives<br />
of the expensive work rolls.<br />
LDV <strong>de</strong>signed the first iLux systems installed<br />
in roll shops for roll diameters between<br />
40 and 100 mm and roll barrel lengths<br />
of up to 850 mm. The system can be adjusted<br />
to other roll dimensions on <strong>de</strong>mand. For rolls<br />
of larger diameters, the iLux LightBox has<br />
proved to be a highly successful option.<br />
■<br />
© LDV<br />
32 ALUMINIUM · 5/2013