DRAWING ROLLING METHOD BY MANDREL MILL

Title:

DRAWING ROLLING METHOD BY MANDREL MILL

Document Type and Number:

WIPO Patent Application WO/2006/104146

Kind Code:

A1

Abstract:

A drawing rolling method by a mandrel mill by which overfill and underfill can be prevented through combination of one kind of grooved rolling rolls. Outside diameter of a hollow shell is set such that the ratio (outer circumferential length of the hollow shell/outer circumferential length of a naked lead pipe on a finishing stand exit side) becomes 1.1 or above when Cr content of the naked lead pipe is 10% or above, and set such that the ratio becomes less than 1.1 when Cr content of the naked lead pipe is less than 10%. Grooved profile of grooved rolling rolls provided, respectively, in first and second stands are set such that the grooved circumferential length dependent on a plurality of grooved rolling rolls provided in the first stand of the mandrel mill satisfies expression (1), the grooved circumferential length dependent on a plurality of grooved rolling rolls provided in the second stand satisfies expression (2), and the grooved circumferential lengths of the first and second stands satisfy expression (3). Drawing rolling of the naked lead pipe is thus carried out using the mandrel mill.

Inventors:

YAMANE AKIHITO (JP)

Application Number:

PCT/JP2006/306292

Publication Date:

October 05, 2006

Filing Date:

March 28, 2006

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
YAMANE AKIHITO (JP)

International Classes:

B21B17/04; B21B27/02

Foreign References:

JPH05185112A	1993-07-27
JP2582705B2	1997-02-19
JP2003010907A	2003-01-15
EP0519705A2	1992-12-23

Other References: