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Patent Searching and Data


Title:
METHOD FOR CONTROLLING OUTER DIAMETER IN SEIZER
Document Type and Number:
Japanese Patent JPS5994515
Kind Code:
A
Abstract:

PURPOSE: To improve the outer diam. controlling accuracy of a product steel pipe, by setting respectively the extents of control with respect to the reference set values of respective distances between the bottoms of roll grooves of at least the final stands of respective stands in odd and even numbers to the specified values, in a final seizing stage for manufacturing a seamless steel pipe from a cylindrical billet.

CONSTITUTION: After heating a cylindrical billet 1 by a heating furnace 2, the billet 1 is formed into a sizer blank pipe 10 by a piercer 3, an elongator 5, a plug mill 7 and a reeler 9, and a finished pipe 13 is manufactured by finishing the pipe 10 by means of a sizer 12 after heating the pipe 10 by a reheating furnace 11. In this case; the sizer 12 is formed by arranging continuously plural roll stands consisting respectively of a pair of groove rolls of which arrangement is mutually changed by 90°, and the extents of control with respect to the reference set values of respective distances between the bottoms of roll grooves of at least the final stands of respective stands in odd and even numbers are respectively set to the specified values; then the outer diam. controlling accuracy of a finished pipe 13 at the normal temperature is stabilized.


Inventors:
IMAE TOSHIO
Application Number:
JP20208182A
Publication Date:
May 31, 1984
Filing Date:
November 19, 1982
Export Citation:
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Assignee:
KAWASAKI STEEL CO
International Classes:
B21B17/14; B21B37/00; B21B37/16; B21B37/78; B21B19/10; B21B23/00; (IPC1-7): B21B19/10
Attorney, Agent or Firm:
Shuji Shiokawa