BORING MACHINE, PLUG, AND METHOD OF MANUFACTURING SEAMLESS STEEL TUBE

Title:

BORING MACHINE, PLUG, AND METHOD OF MANUFACTURING SEAMLESS STEEL TUBE

Document Type and Number:

WIPO Patent Application WO/2006/134957

Kind Code:

A1

Abstract:

A plug (2) used for a boring machine, comprises a tip part (23), a cylindrical part (24), a body part (25), a core joining part (22), and a jetting hole (21). The jetting hole (21) is passed through from the surface of the cylindrical part (24) to the surface of the core joining part (22), and jets a lubricant fed from the outside thereto. A bored material forms a clearance from the cylindrical part (24). Since the jetting hole (21) is formed in the cylindrical part (24), the material during boring is not brought into contact with the jetting hole (21). Accordingly, scores resulting from the contact of the material on the jetting hole (21) can be prevented from occurring on the inner surface of the material.

Inventors:

SHIMODA KAZUHIRO (JP)
YAMAKAWA TOMIO (JP)

Application Number:

PCT/JP2006/311904

Publication Date:

December 21, 2006

Filing Date:

June 14, 2006

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
SHIMODA KAZUHIRO (JP)
YAMAKAWA TOMIO (JP)

International Classes:

B21B25/00; B21B19/04; B21B25/04

Foreign References:

JPH02224805A

1990-09-06

Other References: