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

WIPO Patent Application WO/2006/134957

A1

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.

Shimoda, Kazuhiro c/o SUMITOMO METAL INDUSTRIES LTD. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Yamakawa, Tomio c/o SUMITOMO METAL INDUSTRIES LTD. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)

PCT/JP2006/311904

December 21, 2006

June 14, 2006

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SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Shimoda, Kazuhiro c/o SUMITOMO METAL INDUSTRIES LTD. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Yamakawa, Tomio c/o SUMITOMO METAL INDUSTRIES LTD. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)

B21B25/00; B21B19/04; B21B25/04

Ueba, Hidetoshi (Intelix International, 4th Fl., Kadono Bldg., 2-1, Tenma 2-chome, Kita-ku, Osaka-sh, Osaka 43, 63000, JP)

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