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Title:
PLUG, PIERCING ROLLING APPARATUS AND METHOD OF MANUFACTURING SEAMLESS TUBE USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2010/100968
Kind Code:
A1
Abstract:
A plug has a front portion of convex shape, a generally cylindrical portion, a trunk portion having an external radius gradually enlarging toward the rear end, a mandrel connecting portion at the rear end, and a lubricant path extending from the mandrel connecting portion through the trunk portion to a surface of the cylindrical portion. On the surfaces of the front portion and the trunk portion is formed a coat including oxides and Fe made by the arc spraying method with an iron wire. The plug enables to prevent flaws on the internal surface of hollow tubes in the piercing/rolling process and to produce without extending the production time and yet with extended service time.

Inventors:
HIGASHIDA Yasuto (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
東田 泰斗 (〒41 大阪府大阪市中央区北浜四丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
HIDAKA Yasuyoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
日高 康善 (〒41 大阪府大阪市中央区北浜四丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
Application Number:
JP2010/050668
Publication Date:
September 10, 2010
Filing Date:
January 21, 2010
Export Citation:
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Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜四丁目5番33号 Osaka, 〒5410041, JP)
HIGASHIDA Yasuto (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
東田 泰斗 (〒41 大阪府大阪市中央区北浜四丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
HIDAKA Yasuyoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
International Classes:
B21B25/00; B21B19/04; B21B25/04
Domestic Patent References:
2006-12-21
2006-12-21
Foreign References:
JPS5913924B21984-04-02
JPH10249412A1998-09-22
JPH01180712A1989-07-18
JPH10235413A1998-09-08
JPS51133167A1976-11-18
JPH048498A1992-01-13
JPH0474848A1992-03-10
JPH04270003A1992-09-25
JPH0647147A1994-02-22
Attorney, Agent or Firm:
MORI Michio et al. (M. MORI PATENT OFFICE, 17-23 Higashinaniwa-cho 5-chome, Amagasaki-sh, Hyogo 92, 〒6600892, JP)
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