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Title:
METHOD FOR HIGHLY EXPANDING/ROLLING SEAMLESS TUBE
Document Type and Number:
Japanese Patent JPH07171606
Kind Code:
A
Abstract:

PURPOSE: To evade the defective biting, defective running-out of a material to be rolled and the breakage of a hollow by flaring, to increase the degree of freedom in rolling setting and to enable highly expanding/rolling a tube without impeding yield and productivity.

CONSTITUTION: In a method for highly expanding/rolling a seamless tube, the lead angle β, cross angle γ, face angle α1 on the inlet side, face angle α2 on the outlet side of a rolling are set in the range of 5≤β≤25°, 10≤γ≤40°, 20≤β+γ-≤50°. 0.5≤α1≤5°, 3≤α2≤10° and α1≤α2 and further thickness reduction rate Rt and tube expansion rate Er are set in the range of 1≤Er/Rt≤3.


Inventors:
Shimizu, Tetsuo
Yorifuji, Akira
Application Number:
JP1993000343302
Publication Date:
July 11, 1995
Filing Date:
December 17, 1993
Export Citation:
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Assignee:
KAWASAKI STEEL CORP
International Classes:
B21B19/04; B21B19/08; B21B27/02; (IPC1-7): B21B19/08; B21B19/04; B21B27/02