Mandrel mill and method of tube rolling by using the same

Metal deforming – By use of roller or roller-like tool-element – With tool inside hollow work

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72209, 72224, B21B 1710

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active

056576595

ABSTRACT:
In a mandrel mill for elongating and rolling a hollow shell, with a mandrel bar inserted, by passing the hollow shell, a four-roll stand for diameter reduction used to reduce only the outer diameter of the hollow shell is disposed as the first stand, a group of two-roll stands for wall thickness reduction used to reduce the wall thickness of the hollow shell is disposed following the four-roll stand, and a four-roll stand for eccentric wall cancellation used to cancel any nonuniform wall thickness in the circumferential direction of the hollow shell is disposed as the final stand. The ratio (D.sub.i /D.sub.m) between inner diameter D.sub.i of the hollow shell on the outlet side of the four-roll stand as the first stand and outer diameter D.sub.m of the mandrel bar is 1.05 or less.

REFERENCES:
patent: 5218851 (1993-06-01), Imae
patent: 5331835 (1994-07-01), Palma et al.
DE-FB: "Handbook des alten Huttenwesens, Walzwerkswesen", 3rd vol., 1939, Verlag Stahl und Dusseldorf, pp. 389-391.
Revamping of Seamless Tube Plant by Mini-MPM Technology of Tube Economics & Technology Conference, 10-14 May, 1993.

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