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Ganzheitliches berwachungskonzept fr Tragzapfenlager in Konvertern

16/06/2015

2015-06-16 | 000-005-897 DE-DE

SCHAEFFLER AG, D SSELDORF/SCHWEINFURT

Schaeffler auf der METEC 2015 (Halle 3, Stand C16)

Ganzheitliches berwachungskonzept f r Tragzapfenlager in Konvertern

Eine der Hauptanforderungen der stahlverarbeitenden Industrie ist die h chstm gliche Verf gbarkeit zentraler Produktionsanlagen. Gerade f r Engpassaggregate wie Konverter in Oxygenstahlwerken ist ein Ausfall f r Anlagenbetreiber oftmals mit Kosten bis in den Millionenbereich verbunden. Eine L sung hierf r bietet Schaeffler mit einem neuen, ganzheitlichen Online- berwachungskonzept f r die Tragzapfenlager und Getriebe von Konvertern. berwachungskonzepte wie die Schallemissionsmessung (Acoustic Emission), die bew hrte lpartikelanalyse durch den FAG Wear Debris Check sowie die Pr fung des Schmierfettzustandes mit dem FAG GreaseCheck sind dabei in ein einzigartiges Condition-Monitoring-System integriert. So werden Wartungsma nahmen planbar und teure, ungeplante Maschinenstillst nde aufgrund von Lagersch den vermieden. Zertifizierte Experten unterst tzen bei der Datenauswertung und geben Handlungsempfehlungen an den Kunden.

Neben dem Condition Monitoring tr gt Schaeffler auch mit seinen Lagern, Geh usen und Montage Services zu einem integrierten L sungsansatz bei, der dem Anwender optimale Gesamtbetriebskosten (TCO) bietet.

Schallemissionsmessung (Acoustic Emission)

Erstmals bietet Schaeffler ein Condition-Monitoring-System an, das das Prinzip der Schallemissionsmessung anwendet. Dieses Verfahren eignet sich ideal im Fall langsam drehender Tragzapfenlager, wie sie in Konvertern eingesetzt werden. Hier kann die sonst bliche Schwingungsmessung nicht zuverl ssig eingesetzt werden, da die Drehzahl zu niedrig ist und somit bei der berrollung einer Sch digung im W lzlager nicht gen gend Energie f r eine auswertbare Messung des K rperschalls freigesetzt wird. Ebenso k nnen zu kurze Prozesse die Messzeit soweit reduzieren, dass die Aufl sung zu gering ist.

Die Schallemissionsmessung hingegen nutzt den Effekt, dass es beim ber die Elastizit tsgrenze hinaus belasteten Material zu einer plastischen Verformung oder einem Bruch kommt. Dieser Defekt f hrt zu einer Konzentration von Spannungen, dann zu einer Rissbildung und letztendlich zu einer pl tzlichen Entspannung des Materials. Dieser kurzzeitige Vorgang erzeugt ein Schallemissionsereignis, das sich als Ultraschallwelle von der Quelle wegbewegt und gemessen werden kann.

lpartikelanalyse - FAG Wear Debris Check

Verschlei erscheinungen an Lagern oder Zahnr dern in Getrieben u ern sich bereits fr hzeitig vor einem drohenden Ausfall in Form von Metallabrieb. Wird dieser Abrieb gemessen und berwacht, k nnen Sch den an lumlaufgeschmierten Getrieben aber auch Gleitlagern fr hzeitig erkannt werden. Der FAG Wear Debris Check misst die Anzahl der Partikel im l und erm glicht die bermittlung von Kennwerten an das bergeordnete berwachungssystem sowie die Aufzeichnung und Auswertung der Partikelkonzentration, klassifiziert nach Gr e und Material.

Aufgrund langsamer Drehzahlen des Gro radantriebes eines Konverters ist eine berwachung mittels Schwingungsanalyse nicht m glich. Daher wird hier eine permanente lpartikelanalyse mittels FAG Wear Debris Check eingesetzt.

Fettqualit tsmessung - FAG GreaseCheck

ber die H lfte aller W lzlagerausf lle ist unmittelbar auf die Schmierung zur ckzuf hren. Schmierungsbedingungen, physikalische Fettalterung oder der Anteil von festen und fl ssigen Verunreinigungen, wie z.B. Wasser im Schmierstoff, haben einen entscheidenden Einfluss auf die Lagerlebensdauer.

Mit dem Schmierfettsensor FAG GreaseCheck und der zugeh rigen Auswertelektronik ist es m glich, bei laufendem Betrieb Zustands nderungen des Fettes zu detektieren, lange bevor es zu Sch digungen im W lzlager kommt. Dadurch l sst sich der Schmierfettaustausch genau planen und die Einsatzdauer des W lzlagers verl ngern. Zus tzlich ist ein Wechsel von der zeit- zur bedarfsgesteuerten Nachschmierung m glich. In den neuen FAG-Sph roguss-Geh usen f r Konverterlager sind neben Messstellen f r die Schallemissionssensoren bereits Bohrungen f r die Fettqualit tsmessung integriert.

Zusammenf hrung und Auswertung der Messdaten - FAG ProCheck

Neben der Gesamtzahl von ber 60 ermittelbaren Kennwerten m ssen auch die Prozessparameter im Rahmen der berwachungsstrategie aufgenommen werden. Der FAG ProCheck berwacht repr sentative Kennwerte und bereitet diese entsprechend f r die Anlagenvisualisierung auf. Die Alarmierungsfunktion des FAG ProCheck meldet St rungs- und Fehlermeldungen. ber einen Remote-Zugriff k nnen Schaeffler-Serviceingenieure eine Auswertung und Analyse in der notwendigen Detailtiefe durchf hren und detaillierte Handlungsempfehlungen aussprechen.
LINK: http://www.ina.de/content.ina.de/en/press/press-releases/press-details...
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