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Der größte Vorteil einer Doppelschnecke ist, dass nach Verschleiß das Spiel durch axiales Verschieben wiederhergestellt werden kann. Letzten Monat halfen wir einem Kunden für Positionieranlagen, ein Doppelganggetriebe von 0,12 mm auf 0,03 mm einzustellen; die Genauigkeit war wieder da.
1. Problemstellung
Die Anlage positioniert präzise; ursprüngliches Umkehrspiel musste unter 0,03 mm bleiben. Nach zwei Jahren wurde die Positionierung ungenau und das Spiel größer.
Beim Öffnen: normaler Verschleiß ohne schwere Schäden. Teile tauschen war unnötig — Spiel nachstellen reichte.
2. Einstellablauf
Schritt 1: Aktuelles Spiel messen. Schnecke fixieren, Messuhr am Radumfang ansetzen, Schnecke hin- und herdrehen; Ablesung = Umkehrspiel. Kunde: 0,12 mm — etwa das Vierfache des Neuwerts.
Schritt 2: Sicherungsmuttern am Schneckenlagergehäuse lösen. Muttern nicht ganz abnehmen — nur so weit, dass axiales Verschieben möglich ist.
Schritt 3: Schneckenende leicht mit Kupferdorn klopfen und axial in Schritten von ca. 0,02 mm verschieben.
Schritt 4: Nach jedem Schritt neu messen. Bei etwa 0,03 mm stoppen.
3. Kontrolle nach der Einstellung
Zusätzlich prüfen:
– Leichtgängiges Drehen ohne Klemmen
– Tragbild in der Flankenmitte
– Unverändertes Spiel nach Anziehen der Muttern
Probelauf: Positioniergenauigkeit wieder auf Neugeräteniveau ohne Teilewechsel — Kosteneinsparung.
4. Hinweise
Kleiner ist nicht immer besser. Fühlt sich die Schnecke bei 0,03 mm deutlich schwergängig an, wurde überdreht — etwas zurück. Zu kleines Spiel verschlechtert die Schmierung, erhöht die Temperatur und verkürzt die Lebensdauer.
Doppelschnecke und Rad müssen gepaart laufen und sind nicht austauschbar. Dezhou Xinmi Machinery fertigt Doppelgang-Schneckenpaare und nimmt Zeichnungen oder Muster an.
