Abstract
The redundant shear strains of the three-roll combined piercing-elongating seamless tubemaking process are qualitatively analysed by two kinds of simulative workpieces made of pure lead. The distribution of the three redundant strains along deformation zone and relationship between total redundant factor and feed angle are obtained under the condition of different process parameters, which provide the reliable basis for reasonable design of deforming tool and optimization of process parameters. Versuche mit zwei Proben aus Weichblei dienten zur Ermittlung der redundanten Umformung während der Herstellung nahtloser Rohre auf einem Dreiwalzen-Loch-/Streckwalzwerk. Daraus resultierte die Verteilung der redundanten Umformung innerhalb der Umformzone unter dem Einfluß verschiedener Parameter. Ein weiteres Ergebnis war die Beziehung zwischen dem Gesamtredundanzgrad und den Verfahrensparametern. Somit wurde zur Optimierung des Kalibrierens und des Verfahrens beigetragen.
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